springmvc的图片上传 1.导入相应的pom依赖 dependency groupIdcommons-fileupload/groupId artifactIdcommons-fileupload/artifactId version1.3.3/version /dependency 2.添加springmvc-servlet.xml里面的配置 bean id="multipartResolve
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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