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springmvc图片上传及json数据转换过程详解

2019-12-02 18:11 621 查看

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：

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标签： spring mvc 图片上传 json 数据转换

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