SpringBoot相关配置

8.1 配置

• Spring MVC的配置是通过继承WebMvcConfigurerAdapter类并重载其方法实现的;
• 前几个教程已做了得配置包括
  • 01点睛Spring MVC 4.1-搭建环境 配置viewResolver
  • 03点睛Spring MVC 4.1-REST 静态资源映射
  • 04点睛Spring MVC 4.1-拦截器 配置拦截器
  • 06点睛Spring MVC 4.1-文件上传 配置multipartResolver
  • 07点睛Spring MVC4.1-ContentNegotiatingViewResolver 配置ContentNegotiatingViewResolver

8.2 演示

8.2.1 配置路径匹配参数

• 在Spring MVC中路径参数如果带.的话,.后面的值将被忽略,本例演示配置configurePathMatch不忽略点后面的参数;

• 演示控制器

@RequestMapping("/configPath/{test}") public @ResponseBody String configPath(@PathVariable String test){ return "request value:"+test; } 

• 运行:访问http://localhost:8080/testSpringMVC/configPath/xx.yy

• 在继承WebMvcConfigurerAdapter的DemoMVCConfig类中重载configurePathMatch

    @Override
    public void configurePathMatch(PathMatchConfigurer configurer) { configurer.setUseSuffixPatternMatch(false); }

• 再次运行:访问访问http://localhost:8080/testSpringMVC/configPath/xx.yy

8.2.2 快捷定义ViewController

• 我们经常涉及到页面转向,但没任何处理业务的时候,快捷的页面转向定义会节省好多代码;
• 在views目录下建一个任意的test.jsp
• 常规的方案是这样写的

@RequestMapping("/mytest") public String test(){ return "test"; }

• 在继承WebMvcConfigurerAdapter的DemoMVCConfig类中重载addViewControllers

  @Override
    public void addViewControllers(ViewControllerRegistry registry) { registry.addViewController("/mytest").setViewName("/test"); //添加更多 }

• 以上效果等同,均会指向views下的test.jsp

8.2.3 配置HttpMessageConverter

• HttpMessageConverter是对http的request和response进行自动转换

• 配置HttpMessageConverter可重载下面两个方法任意一个

  • configureMessageConverters:重载会覆盖掉spring mvc默认注册的多个HttpMessageConverter
  • extendMessageConverters:仅添加一个自定义的HttpMessageConverter,不覆盖默认注册的HttpMessageConverter

• 通过对上面的讲述,我们一般是重载extendMessageConverters方法;

• 下面我们演示使用js向spring mvc发送自定义格式的字符串(属性用-隔开),通过自定义的HttpMessageConverter自动转换成对象,然后通过HttpMessageConverter输出指定格式到浏览器

• 测试javabean

  • Person

package com.wisely.domain; public class Person { private String firstName; private String lastName; public Person(String firstName, String lastName) { super(); this.firstName = firstName; this.lastName = lastName; } public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } }

• 自定义HttpMessageConverter：WiselyMessageConverter

package com.wisely.converters; import java.io.IOException; import java.nio.charset.Charset; import org.springframework.http.HttpInputMessage; import org.springframework.http.HttpOutputMessage; import org.springframework.http.MediaType; import org.springframework.http.converter.AbstractHttpMessageConverter; import org.springframework.http.converter.HttpMessageNotReadableException; import org.springframework.http.converter.HttpMessageNotWritableException; import org.springframework.util.StreamUtils; import com.wisely.domain.Person; public class WiselyMessageConverter extends AbstractHttpMessageConverter<Person> { //自定义媒体类型 public WiselyMessageConverter(){ super(new MediaType("application", "x-wisely", Charset.forName("UTF-8"))); } //从request里获得构造Person实例的数据 @Override protected Person readInternal(Class<? extends Person> clazz, HttpInputMessage inputMessage) throws IOException, HttpMessageNotReadableException { String temp = StreamUtils.copyToString(inputMessage.getBody(), Charset.forName("UTF-8")); String[] tempArr = temp.split("-"); return new Person(tempArr[0],tempArr[1]); } //只支持Person类 @Override protected boolean supports(Class<?> clazz) { return Person.class.isAssignableFrom(clazz); } //将person实例转换成你想要的字符串格式 @Override protected void writeInternal(Person person, HttpOutputMessage outputMessage) throws IOException, HttpMessageNotWritableException { String out = "hello:" +person.getFirstName() + "-" + person.getLastName(); outputMessage.getBody().write(out.getBytes()); } } 

• 配置WiselyMessageConverter

  @Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) { WiselyMessageConverter converter = new WiselyMessageConverter(); converters.add(converter); } 

注释掉上例的configureContentNegotiation,这里会自动将媒体类型变为text/html

// 配置ContentNegotiationManager,在无后缀名情况下默认为jsp view resolver
// @Override // public void configureContentNegotiation( // ContentNegotiationConfigurer configurer) { // //忽略请求的header信息,并将contentType置为text/html // configurer.ignoreAcceptHeader(true).defaultContentType( // MediaType.TEXT_HTML); // }

• 测试控制器

@RequestMapping(value = "/convert", produces = { "application/x-wisely" }) public @ResponseBody Person convert(@RequestBody Person person) { return person; } 

• 测试页面：test.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <div id="resp"></div><input type="button" onclick="req();" value="请求"/> <script src="js/jquery.js" type="text/javascript"></script> <script> function req(){ $.ajax({ url: "convert", data: "wang-yunfei",//注意此处的格式 type:"POST", contentType:"application/x-wisely", success: function(data){ $("#resp").html(data); } }); } </script> </body> </html>

• 运行效果