文件上傳
pom依賴
<dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.3</version> </dependency>
springmvc.xml
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!-- 必須和用戶JSP 的pageEncoding屬性一致,以便正確解析表單的內容 --> <property name="defaultEncoding" value="UTF-8"></property> <!-- 文件最大大小(字節) 1024*1024*50=50M--> <property name="maxUploadSize" value="52428800"></property> <!--resolveLazily屬性啟用是為了推遲文件解析,以便捕獲文件大小異常--> <property name="resolveLazily" value="true"/> </bean>
jsp頁面
<%-- Created by IntelliJ IDEA. User: dell Date: 2019/9/29 Time: 19:57 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>上傳圖片</title> </head> <body> <form action="${pageContext.request.contextPath}/upload" method="post" enctype="multipart/form-data"> <input type="file" name="xxx"> <input type="submit" value="上傳"> </form> </body> </html>
代碼
@RequestMapping("/upload") @ResponseBody public String upload(HttpServletRequest request, MultipartFile xxx){ try { FileUtils.copyInputStreamToFile(xxx.getInputStream(),new File("E://temp/"+xxx.getOriginalFilename())); } catch (IOException e) { e.printStackTrace(); } return "上傳成功"; }
如果要訪問這張圖片要配置映射文件:
結果:
json返回處理:
在請求方法前加這個@ResponseBody
@ResponseBody @RequestMapping("/jsonStr2") public Map jsonStr2(){ return bookService.listPager(new Book(),new PageBean()).get(0); }
結果
json返回處理的工具類
package com.cjh.util; public class JSONResult { // 響應業務狀態 private Integer status; // 響應消息 private String msg; // 響應中的數據 private Object data; private String ok; // 不使用 public static JSONResult build(Integer status, String msg, Object data) { return new JSONResult(status, msg, data); } public static JSONResult ok(Object data) { return new JSONResult(data); } public static JSONResult ok() { return new JSONResult(null); } public static JSONResult errorMsg(String msg) { return new JSONResult(500, msg, null); } public static JSONResult errorMap(Object data) { return new JSONResult(501, "error", data); } public static JSONResult errorTokenMsg(String msg) { return new JSONResult(502, msg, null); } public static JSONResult errorException(String msg) { return new JSONResult(555, msg, null); } public JSONResult() { } public JSONResult(Integer status, String msg, Object data) { this.status = status; this.msg = msg; this.data = data; } public JSONResult(Object data) { this.status = 200; this.msg = "OK"; this.data = data; } public Boolean isOK() { return this.status == 200; } public Integer getStatus() { return status; } public void setStatus(Integer status) { this.status = status; } public String getMsg() { return msg; } public void setMsg(String msg) { this.msg = msg; } public Object getData() { return data; } public void setData(Object data) { this.data = data; } public String getOk() { return ok; } public void setOk(String ok) { this.ok = ok; } }
測試
@ResponseBody @RequestMapping("/jsonStr3") public JSONResult jsonStr3(){ return JSONResult.ok("這里是data對象"); } @ResponseBody @RequestMapping("/jsonStr4") public JSONResult jsonStr4(){ return JSONResult.errorMsg("請求異常"); } }