文件上传
pom依赖
<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"> <!-- 必须和用户JSP 的pageEncoding属性一致，以便正确解析表单的内容 --> <property name="defaultEncoding" value="UTF-8"></property> <!-- 文件最大大小(字节) 1024*1024*50=50M--> <property name="maxUploadSize" value="52428800"></property> <!--resolveLazily属性启用是为了推迟文件解析，以便捕获文件大小异常--> <property name="resolveLazily" value="true"/> </bean>
jsp页面
<%-- 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>上传图片</title> </head> <body> <form action="${pageContext.request.contextPath}/upload" method="post" enctype="multipart/form-data"> <input type="file" name="xxx"> <input type="submit" value="上传"> </form> </body> </html>
代码
@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 "上传成功"; }
如果要访问这张图片要配置映射文件：
结果：
json返回处理：
在请求方法前加这个@ResponseBody
@ResponseBody @RequestMapping("/jsonStr2") public Map jsonStr2(){ return bookService.listPager(new Book(),new PageBean()).get(0); }
结果
json返回处理的工具类
package com.cjh.util; public class JSONResult { // 响应业务状态 private Integer status; // 响应消息 private String msg; // 响应中的数据 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; } }
测试
@ResponseBody @RequestMapping("/jsonStr3") public JSONResult jsonStr3(){ return JSONResult.ok("这里是data对象"); } @ResponseBody @RequestMapping("/jsonStr4") public JSONResult jsonStr4(){ return JSONResult.errorMsg("请求异常"); } }
