springmvc图片上传、json

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

 <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>

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：

posted on 2019-10-08 20:34 骑猪南下L 阅读(254) 评论(0) 编辑收藏举报