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");
}
}
原文地址：https://www.cnblogs.com/chenjiahao9527/p/11614170.html
时间： 2024-11-07 18:45:30