1、首先說明一下，這里使用的是Springboot2.2.6.RELEASE版本，由於Springboot迭代很快，所以要注意版本問題。
SpringBoot對表單做數據校驗，SpringBoot對表單數據校驗的技術特點，SpringBoot中使用了Hibernate-validate校驗框架（SpringBoot的Web啟動器中已經包含了Hibernate-validate校驗框架的依賴jar包）。
2、SpringBoot表單數據校驗步驟。
2.1、第一步，在實體類中添加校驗規則，在被校驗的實體類中要被校驗的屬性，使用注解進行校驗。
1 package com.bie.springboothello.po; 2 3 import javax.validation.constraints.NotBlank; 4 5 public class Users { 6 7 private Integer id;//用戶編號 8 @NotBlank // 非空檢驗，表示當前屬性不能為空。 9 private String name;//用戶賬號 10 @NotBlank //密碼非空校驗 11 private Integer age;//用戶密碼 12 13 public Integer getId() { 14 return id; 15 } 16 17 public void setId(Integer id) { 18 this.id = id; 19 } 20 21 public String getName() { 22 return name; 23 } 24 25 public void setName(String name) { 26 this.name = name; 27 } 28 29 public Integer getAge() { 30 return age; 31 } 32 33 public void setAge(Integer age) { 34 this.age = age; 35 } 36 37 @Override 38 public String toString() { 39 return "Users{" + 40 "id=" + id + 41 ", name='" + name + '\'' + 42 ", age=" + age + 43 '}'; 44 } 45 46 public Users(Integer id, String name, Integer age) { 47 this.id = id; 48 this.name = name; 49 this.age = age; 50 } 51 }
2.2、第二步，在Controller中開啟校驗。
1 package com.bie.springboothello.controller; 2 3 import com.bie.springboothello.po.Users; 4 import com.bie.springboothello.service.UsersService; 5 import org.springframework.beans.factory.annotation.Autowired; 6 import org.springframework.stereotype.Controller; 7 import org.springframework.ui.Model; 8 import org.springframework.validation.BindingResult; 9 import org.springframework.web.bind.annotation.PathVariable; 10 import org.springframework.web.bind.annotation.RequestMapping; 11 import org.springframework.web.bind.annotation.ResponseBody; 12 13 import javax.validation.Valid; 14 import java.util.List; 15 16 /** 17 * SpringBoot表單數據校驗 18 */ 19 20 @Controller 21 @RequestMapping(value = "/users") 22 public class UsersController { 23 24 @Autowired 25 private UsersService usersService; 26 27 28 /** 29 * 頁面跳轉 30 * <p> 31 * <p> 32 * thymeleaf框架，模板級的視圖層技術，需要放到classpath的根目錄下，也就是src/main/resources下面的一個包叫做templates的目錄下面 33 * 34 * <p> 35 * <p> 36 * 由於templates目錄是安全的，不允許直接被外界訪問的，所以將視圖放到這里面之后，必須有Controller里面的方法 37 * 幫助做頁面的跳轉，此方法的作用就是做頁面的跳轉。 38 * 39 * @param page 40 * @return 41 */ 42 @RequestMapping(value = "/{page}") 43 public String showPage(@PathVariable String page) { 44 System.out.println("============================================" + page); 45 return page; 46 } 47 48 49 /** 50 * 添加用戶信息 51 * 52 * @param users @Valid注解表示開啟對Users對象的數據校驗。 53 * @param bindingResult 校驗過程中產生的校驗結果，校驗結果存放到BindingResult中。封裝了校驗的結果。 54 * 對校驗結果的成功或者錯誤的提示信息進行回顯進行提示。 55 * @return 56 */ 57 @RequestMapping(value = "addUser") 58 public String addUser(@Valid Users users, BindingResult bindingResult) { 59 // 如果校驗失敗了，從那個頁面來返回到那個界面即可，並進行提示。 60 if (bindingResult.hasErrors()) { 61 return "input"; 62 } 63 this.usersService.addUser(users); 64 return "redirect:/users/findUserAll"; 65 } 66 67 68 }
2.3、第三步，在頁面中獲取提示信息。
1 <!DOCTYPE html> 2 <html xmlns:th="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>添加用戶</title> 6 </head> 7 <body> 8 <h1 style="text-align: center">用戶管理~新增用戶</h1> 9 <hr/> 10 11 <div style="text-align: center"> 12 <form th:action="@{/users/addUser}" method="post"> 13 14 用戶姓名：<input type="text" name="name"/> 15 <!-- 根據users.name去BindingResult對象里面查找的key，然后找到錯誤信息進行提示，按照參數對象的駝峰方式進行命名，這個駝峰命名的就是前端要使用的對象 --> 16 <span color="red" th:errors="${users.name}"></span><br/> 17 用戶年齡：<input type="text" name="age"/> 18 <span color="red" th:errors="${users.age}"></span><br/><br/> 19 <input type="submit" value="確定"/> 20 <input type="reset" value="重置"/><br/> 21 </form> 22 </div> 23 24 </body> 25 </html>
嗯，報錯了，說找不到users屬性了。因為這里面的跳轉是，如果驗證出現了問題，那么跳轉到輸入界面，而這個跳轉到輸入界面是由Controller的一個方法跳轉的，此時這個方法沒有users屬性，導致的報錯。
1 2020-05-11 22:55:18.726 ERROR 5052 --- [0.1-8080-exec-2] org.thymeleaf.TemplateEngine : [THYMELEAF][http-nio-127.0.0.1-8080-exec-2] Exception processing template "input": Error during execution of processor 'org.thymeleaf.spring5.processor.SpringErrorsTagProcessor' (template: "input" - line 16, col 27) 2 3 org.thymeleaf.exceptions.TemplateProcessingException: Error during execution of processor 'org.thymeleaf.spring5.processor.SpringErrorsTagProcessor' (template: "input" - line 16, col 27) 4 at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:117) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 5 at org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 6 at org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 7 at org.thymeleaf.engine.ProcessorTemplateHandler.handleOpenElement(ProcessorTemplateHandler.java:1314) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 8 at org.thymeleaf.engine.OpenElementTag.beHandled(OpenElementTag.java:205) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 9 at org.thymeleaf.engine.TemplateModel.process(TemplateModel.java:136) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 10 at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:592) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 11 at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098) [thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 12 at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072) [thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 13 at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:362) [thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 14 at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:189) [thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 15 at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1373) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 16 at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1118) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 17 at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1057) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 18 at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 19 at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 20 at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 21 at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) [tomcat-embed-core-9.0.33.jar:9.0.33] 22 at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) [spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 23 at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) [tomcat-embed-core-9.0.33.jar:9.0.33] 24 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat-embed-core-9.0.33.jar:9.0.33] 25 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33] 26 at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) [tomcat-embed-websocket-9.0.33.jar:9.0.33] 27 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33] 28 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33] 29 at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 30 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 31 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33] 32 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33] 33 at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 34 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 35 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33] 36 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33] 37 at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 38 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) [spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 39 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.33.jar:9.0.33] 40 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.33.jar:9.0.33] 41 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [tomcat-embed-core-9.0.33.jar:9.0.33] 42 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.33.jar:9.0.33] 43 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.33.jar:9.0.33] 44 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.33.jar:9.0.33] 45 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.33.jar:9.0.33] 46 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.33.jar:9.0.33] 47 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.33.jar:9.0.33] 48 at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) [tomcat-embed-core-9.0.33.jar:9.0.33] 49 at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.33.jar:9.0.33] 50 at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.33.jar:9.0.33] 51 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594) [tomcat-embed-core-9.0.33.jar:9.0.33] 52 at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.33.jar:9.0.33] 53 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_191] 54 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_191] 55 at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.33.jar:9.0.33] 56 at java.lang.Thread.run(Thread.java:748) [na:1.8.0_191] 57 Caused by: java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'users' available as request attribute 58 at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:153) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 59 at org.springframework.web.servlet.support.RequestContext.getBindStatus(RequestContext.java:903) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 60 at org.thymeleaf.spring5.context.webmvc.SpringWebMvcThymeleafRequestContext.getBindStatus(SpringWebMvcThymeleafRequestContext.java:227) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 61 at org.thymeleaf.spring5.util.FieldUtils.getBindStatusFromParsedExpression(FieldUtils.java:306) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 62 at org.thymeleaf.spring5.util.FieldUtils.getBindStatus(FieldUtils.java:258) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 63 at org.thymeleaf.spring5.util.FieldUtils.getBindStatus(FieldUtils.java:227) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 64 at org.thymeleaf.spring5.processor.SpringErrorsTagProcessor.doProcess(SpringErrorsTagProcessor.java:65) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 65 at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 66 ... 52 common frames omitted 67 68 2020-05-11 22:55:18.729 ERROR 5052 --- [0.1-8080-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateProcessingException: Error during execution of processor 'org.thymeleaf.spring5.processor.SpringErrorsTagProcessor' (template: "input" - line 16, col 27)] with root cause 69 70 java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'users' available as request attribute 71 at org.springframework.web.servlet.support.BindStatus.<init>(BindStatus.java:153) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 72 at org.springframework.web.servlet.support.RequestContext.getBindStatus(RequestContext.java:903) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 73 at org.thymeleaf.spring5.context.webmvc.SpringWebMvcThymeleafRequestContext.getBindStatus(SpringWebMvcThymeleafRequestContext.java:227) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 74 at org.thymeleaf.spring5.util.FieldUtils.getBindStatusFromParsedExpression(FieldUtils.java:306) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 75 at org.thymeleaf.spring5.util.FieldUtils.getBindStatus(FieldUtils.java:258) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 76 at org.thymeleaf.spring5.util.FieldUtils.getBindStatus(FieldUtils.java:227) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 77 at org.thymeleaf.spring5.processor.SpringErrorsTagProcessor.doProcess(SpringErrorsTagProcessor.java:65) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 78 at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 79 at org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 80 at org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 81 at org.thymeleaf.engine.ProcessorTemplateHandler.handleOpenElement(ProcessorTemplateHandler.java:1314) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 82 at org.thymeleaf.engine.OpenElementTag.beHandled(OpenElementTag.java:205) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 83 at org.thymeleaf.engine.TemplateModel.process(TemplateModel.java:136) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 84 at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:592) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 85 at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 86 at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE] 87 at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:362) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 88 at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:189) ~[thymeleaf-spring5-3.0.11.RELEASE.jar:3.0.11.RELEASE] 89 at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1373) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 90 at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1118) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 91 at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1057) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 92 at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 93 at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 94 at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 95 at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 96 at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 97 at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 98 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 99 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 100 at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.33.jar:9.0.33] 101 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 102 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 103 at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 104 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 105 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 106 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 107 at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 108 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 109 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 110 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 111 at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 112 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 113 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 114 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 115 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 116 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.33.jar:9.0.33] 117 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.33.jar:9.0.33] 118 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.33.jar:9.0.33] 119 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.33.jar:9.0.33] 120 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.33.jar:9.0.33] 121 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.33.jar:9.0.33] 122 at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) [tomcat-embed-core-9.0.33.jar:9.0.33] 123 at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.33.jar:9.0.33] 124 at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.33.jar:9.0.33] 125 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594) [tomcat-embed-core-9.0.33.jar:9.0.33] 126 at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.33.jar:9.0.33] 127 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_191] 128 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_191] 129 at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.33.jar:9.0.33] 130 at java.lang.Thread.run(Thread.java:748) [na:1.8.0_191]
解決數據校驗時的異常問題，解決異常的方法，在跳轉頁面的方法中注入一個對象，來解決問題。要求參數對象的，變量名必須是對象的類名的全稱首字母小寫。
1 package com.bie.springboothello.controller; 2 3 import com.bie.springboothello.po.Users; 4 import com.bie.springboothello.service.UsersService; 5 import org.springframework.beans.factory.annotation.Autowired; 6 import org.springframework.stereotype.Controller; 7 import org.springframework.ui.Model; 8 import org.springframework.validation.BindingResult; 9 import org.springframework.web.bind.annotation.PathVariable; 10 import org.springframework.web.bind.annotation.RequestMapping; 11 import org.springframework.web.bind.annotation.ResponseBody; 12 13 import javax.validation.Valid; 14 import java.util.List; 15 16 /** 17 * SpringBoot表單數據校驗 18 */ 19 20 @Controller 21 @RequestMapping(value = "/users") 22 public class UsersController { 23 24 @Autowired 25 private UsersService usersService; 26 27 /** 28 * 頁面跳轉 29 * <p> 30 * <p> 31 * thymeleaf框架，模板級的視圖層技術，需要放到classpath的根目錄下，也就是src/main/resources下面的一個包叫做templates的目錄下面 32 * 33 * <p> 34 * <p> 35 * 由於templates目錄是安全的，不允許直接被外界訪問的，所以將視圖放到這里面之后，必須有Controller里面的方法 36 * 幫助做頁面的跳轉，此方法的作用就是做頁面的跳轉。 37 * <p> 38 * <p> 39 * 解決異常的方式。可以在跳轉頁面的方法中注入一個 Uesrs 對象。 40 * 注意：由於springmvc會將該對象放入到Model中傳遞。key的名稱會使用該對象的駝峰式的命名規則來作為key。 41 * 參數的變量名需要與對象的名稱相同。將首字母小寫。 42 * 43 * @param page 44 * @return 45 */ 46 @RequestMapping(value = "/{page}") 47 public String showPage(@PathVariable String page, Users users) { 48 System.out.println("============================================" + page); 49 return page; 50 } 51 52 53 /** 54 * 添加用戶信息 55 * 56 * @param users @Valid注解表示開啟對Users對象的數據校驗。 57 * @param bindingResult 校驗過程中產生的校驗結果，校驗結果存放到BindingResult中。封裝了校驗的結果。 58 * 對校驗結果的成功或者錯誤的提示信息進行回顯進行提示。 59 * @return 60 */ 61 @RequestMapping(value = "addUser") 62 public String addUser(@Valid Users users, BindingResult bindingResult) { 63 // 如果校驗失敗了，從那個頁面來返回到那個界面即可，並進行提示。 64 if (bindingResult.hasErrors()) { 65 return "input"; 66 } 67 this.usersService.addUser(users); 68 return "redirect:/users/findUserAll"; 69 } 70 71 }
嗯，又報錯了。這里需要注意的是，我的年齡age寫成的是Integer類型的。Java實體類中屬性是Integer類型，用了NotBlank判斷不能為空，而這個注解是判斷字符串String是否為空。此時可以使用使用@NotNull， 去掉@NotBlank注解。
備注：使用hibernate validator需要注意@NotNull和@NotEmpty和@NotBlank區別。
a、@NotEmpty用在集合類上面。
b、@NotBlank用在String上面。
c、@NotNull用在基本類型上。
如果在基本類型上面用NotEmpty或者NotBlank 會出現上面的錯。
1 2020-05-14 10:20:19.944 ERROR 1924 --- [0.1-8080-exec-6] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is javax.validation.UnexpectedTypeException: HV000030: No validator could be found for constraint 'javax.validation.constraints.NotBlank' validating type 'java.lang.Integer'. Check configuration for 'age'] with root cause 2 3 javax.validation.UnexpectedTypeException: HV000030: No validator could be found for constraint 'javax.validation.constraints.NotBlank' validating type 'java.lang.Integer'. Check configuration for 'age' 4 at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getExceptionForNullValidator(ConstraintTree.java:108) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 5 at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getInitializedConstraintValidator(ConstraintTree.java:140) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 6 at org.hibernate.validator.internal.engine.constraintvalidation.SimpleConstraintTree.validateConstraints(SimpleConstraintTree.java:55) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 7 at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:73) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 8 at org.hibernate.validator.internal.metadata.core.MetaConstraint.doValidateConstraint(MetaConstraint.java:127) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 9 at org.hibernate.validator.internal.metadata.core.MetaConstraint.validateConstraint(MetaConstraint.java:120) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 10 at org.hibernate.validator.internal.engine.ValidatorImpl.validateMetaConstraint(ValidatorImpl.java:552) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 11 at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForSingleDefaultGroupElement(ValidatorImpl.java:515) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 12 at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForDefaultGroup(ValidatorImpl.java:485) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 13 at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:447) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 14 at org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:397) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 15 at org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:173) ~[hibernate-validator-6.0.18.Final.jar:6.0.18.Final] 16 at org.springframework.validation.beanvalidation.SpringValidatorAdapter.validate(SpringValidatorAdapter.java:109) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE] 17 at org.springframework.boot.autoconfigure.validation.ValidatorAdapter.validate(ValidatorAdapter.java:65) ~[spring-boot-autoconfigure-2.2.6.RELEASE.jar:2.2.6.RELEASE] 18 at org.springframework.validation.DataBinder.validate(DataBinder.java:892) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE] 19 at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.validateIfApplicable(ModelAttributeMethodProcessor.java:360) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 20 at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:162) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 21 at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:121) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 22 at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:167) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 23 at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:134) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 24 at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 25 at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 26 at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 27 at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 28 at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 29 at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 30 at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 31 at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 32 at javax.servlet.http.HttpServlet.service(HttpServlet.java:660) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 33 at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.5.RELEASE.jar:5.2.5.RELEASE] 34 at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 35 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 36 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 37 at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.33.jar:9.0.33] 38 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 39 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 40 at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 41 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 42 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 43 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 44 at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 45 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 46 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 47 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 48 at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 49 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.5.RELEASE.jar:5.2.5.RELEASE] 50 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 51 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 52 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.33.jar:9.0.33] 53 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.33.jar:9.0.33] 54 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) [tomcat-embed-core-9.0.33.jar:9.0.33] 55 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.33.jar:9.0.33] 56 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.33.jar:9.0.33] 57 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.33.jar:9.0.33] 58 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.33.jar:9.0.33] 59 at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) [tomcat-embed-core-9.0.33.jar:9.0.33] 60 at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.33.jar:9.0.33] 61 at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.33.jar:9.0.33] 62 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1594) [tomcat-embed-core-9.0.33.jar:9.0.33] 63 at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.33.jar:9.0.33] 64 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_191] 65 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_191] 66 at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.33.jar:9.0.33] 67 at java.lang.Thread.run(Thread.java:748) [na:1.8.0_191]
如果參數的名稱需要做改變。如果想為傳遞的對象更改名稱，可以使用@ModelAttribute("user")這表示當 前傳遞的對象的 key 為 user。那么我們在頁面中獲取該對象的 key 也需要修改為 user。
1 package com.bie.springboothello.controller; 2 3 import com.bie.springboothello.po.Users; 4 import com.bie.springboothello.service.UsersService; 5 import org.springframework.beans.factory.annotation.Autowired; 6 import org.springframework.stereotype.Controller; 7 import org.springframework.ui.Model; 8 import org.springframework.validation.BindingResult; 9 import org.springframework.web.bind.annotation.ModelAttribute; 10 import org.springframework.web.bind.annotation.PathVariable; 11 import org.springframework.web.bind.annotation.RequestMapping; 12 import org.springframework.web.bind.annotation.ResponseBody; 13 14 import javax.validation.Valid; 15 import java.util.List; 16 17 /** 18 * SpringBoot表單數據校驗 19 */ 20 21 @Controller 22 @RequestMapping(value = "/users") 23 public class UsersController { 24 25 @Autowired 26 private UsersService usersService; 27 28 /** 29 * 頁面跳轉 30 * <p> 31 * <p> 32 * thymeleaf框架，模板級的視圖層技術，需要放到classpath的根目錄下，也就是src/main/resources下面的一個包叫做templates的目錄下面 33 * 34 * <p> 35 * <p> 36 * 由於templates目錄是安全的，不允許直接被外界訪問的，所以將視圖放到這里面之后，必須有Controller里面的方法 37 * 幫助做頁面的跳轉，此方法的作用就是做頁面的跳轉。 38 * <p> 39 * <p> 40 * 解決異常的方式。可以在跳轉頁面的方法中注入一個 Uesrs 對象。 41 * 注意：由於springmvc會將該對象放入到Model中傳遞。key的名稱會使用該對象的駝峰式的命名規則來作為key。 42 * 參數的變量名需要與對象的名稱相同。將首字母小寫。 43 * <p> 44 * <p> 45 * 如果想為傳遞的對象更改名稱，可以使用@ModelAttribute("user")這表示當 前傳遞的對象的 key 為 user。 46 * 那么我們在頁面中獲取該對象的 key 也需要修改為 user 47 * 48 * @param page 49 * @return 50 */ 51 @RequestMapping(value = "/{page}") 52 public String showPage(@PathVariable String page, @ModelAttribute(value = "user") Users users) { 53 System.out.println("============================================" + page); 54 return page; 55 } 56 57 58 /** 59 * 添加用戶信息 60 * 61 * @param users @Valid注解表示開啟對Users對象的數據校驗。 62 * @param bindingResult 校驗過程中產生的校驗結果，校驗結果存放到BindingResult中。封裝了校驗的結果。 63 * 對校驗結果的成功或者錯誤的提示信息進行回顯進行提示。 64 * @return 65 */ 66 @RequestMapping(value = "addUser") 67 public String addUser(@ModelAttribute(value = "user") @Valid Users users, BindingResult bindingResult) { 68 // 如果校驗失敗了，從那個頁面來返回到那個界面即可，並進行提示。 69 if (bindingResult.hasErrors()) { 70 return "input"; 71 } 72 this.usersService.addUser(users); 73 return "redirect:/users/findUserAll"; 74 } 75 76 }
1 <!DOCTYPE html> 2 <html xmlns:th="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>添加用戶</title> 6 </head> 7 <body> 8 <h1 style="text-align: center">用戶管理~新增用戶</h1> 9 <hr/> 10 11 <div style="text-align: center"> 12 <form th:action="@{/users/addUser}" method="post"> 13 14 用戶姓名：<input type="text" name="name"/> 15 <!-- 根據users.name去BindingResult對象里面查找的key，然后找到錯誤信息進行提示 --> 16 <span style="color:red" th:errors="${user.name}"></span><br/> 17 用戶年齡：<input type="text" name="age"/> 18 <span style="color:red" th:errors="${user.age}"></span><br/><br/> 19 <input type="submit" value="確定"/> 20 <input type="reset" value="重置"/><br/> 21 </form> 22 </div> 23 24 </body> 25 </html>
演示效果，如下所示：
如何指定驗證提示信息呢。
1 package com.bie.springboothello.po; 2 3 import javax.validation.constraints.NotBlank; 4 import javax.validation.constraints.NotNull; 5 6 public class Users { 7 8 private Integer id;//用戶編號 9 @NotBlank(message = "用戶賬號不能為空.") // 用戶賬號，非空檢驗 10 private String name;//用戶賬號 11 @NotNull(message = "用戶密碼不能為空") //用戶密碼，非空校驗 12 private Integer age;//用戶密碼 13 14 public Integer getId() { 15 return id; 16 } 17 18 public void setId(Integer id) { 19 this.id = id; 20 } 21 22 public String getName() { 23 return name; 24 } 25 26 public void setName(String name) { 27 this.name = name; 28 } 29 30 public Integer getAge() { 31 return age; 32 } 33 34 public void setAge(Integer age) { 35 this.age = age; 36 } 37 38 @Override 39 public String toString() { 40 return "Users{" + 41 "id=" + id + 42 ", name='" + name + '\'' + 43 ", age=" + age + 44 '}'; 45 } 46 47 public Users(Integer id, String name, Integer age) { 48 this.id = id; 49 this.name = name; 50 this.age = age; 51 } 52 }
演示效果，如下所示：
使用hibernate validator其他校驗規則。
1）、@NotBlank: 判斷字符串是否為null或者是空串(去掉首尾空格)。
2）、@NotEmpty: 判斷字符串是否null或者是空串。
3）、@Length: 判斷字符的長度(最大或者最小)。
4）、@Min: 判斷數值最小值。
5）、@Max: 判斷數值最大值。
6）、@Email: 判斷郵箱是否合法。
7）、@NotNull用在基本類型上。