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

 
   commons-fileupload
   commons-fileupload
   1.3.3
  

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" %>


  


  

HelloController

  @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考高分网。