springmvc图片上传及json数据转换过程详解

springmvc的图片上传

1.导入相应的pom依赖

<dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.3</version> </dependency>

2.添加springmvc-servlet.xml里面的配置

3.前台文件上传表单

<%-- Created by IntelliJ IDEA. User: ASUS Date: 2019/10/5 Time: 10:25 To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head> <title>文件上传</title></head><body> <form action="${pageContext.request.contextPath}/upload" method="post" enctype="multipart/form-data"> 上传的文件：<input type="file" name="img" id=""> <button type="submit">提交</button> </form></body></html>

HelloController

/** * 文件上传 * @param img * @return */ @RequestMapping("/upload") public String upload(MultipartFile img){ try { FileUtils.copyInputStreamToFile(img.getInputStream(),new File("F:/xxx/"+img.getOriginalFilename())); } catch (IOException e) { e.printStackTrace(); } return "forward:hello3"; }

json数据转换

注解格式转换@ResponseBody

工具类JSONResult

package com.liuwenwu.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; }}

HelloController

@ResponseBody @RequestMapping("/jsonData3") public JSONResult jsonData3(){ return JSONResult.ok("成功：这里可以存放字符串、对象、数组、集合都行，这样可以节省拼接map结合的过程"); } @ResponseBody @RequestMapping("/jsonData4") public JSONResult jsonData4(){ return JSONResult.errorMsg("失败：这里可以存放字符串、对象、数组、集合都行，这样可以节省拼接map结合的过程"); }

效果：

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。

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