文件上傳
pom.xml
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.3</version>
</dependency>
springmvc-servlet.xml 添加對文件上傳支持的組件
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- 必須和用戶JSP 的pageEncoding屬性一致，以便正確解析表單的內容 -->
<property name="defaultEncoding" value="UTF-8"></property>
<!-- 文件最大大小(字節) 1024*1024*50=50M-->
<property name="maxUploadSize" value="52428800"></property>
<!--resolveLazily屬性啓用是爲了推遲文件解析，以便捕獲文件大小異常-->
<property name="resolveLazily" value="true"/>
</bean>
upload.jsp
<%--
Created by IntelliJ IDEA.
User: Administrator
Date: 2019/9/29 0029
Time: 20:00
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>文件上傳</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/upload" method="post" enctype="multipart/form-data">
上傳文件：<input type="file" name="img" id="">
<button type="submit">提交</button>
</form>
</body>
</html>
文件上傳請求方法 HelloController
@RequestMapping("/upload")
public String upload(MultipartFile img){
try {
FileUtils.copyInputStreamToFile(img.getInputStream(),new File("D:/wpcache/"+img.getOriginalFilename()));
} catch (IOException e) {
e.printStackTrace();
}
return "forward:hello2";
}
點擊上傳
在相對應的文件內我們看到已經上傳成功
JSON處理
HelloController
@ResponseBody
@RequestMapping("/jsonData1")
public List<Map> jsonData1(){
return bookService.listPager(new Book(),new PageBean());
}
@ResponseBody
@RequestMapping("/jsonData2")
public Map jsonData2(){
return bookService.listPager(new Book(),new PageBean()).get(0);
}
jsonData1
jsonData2
JSON 返回結果處理工具類
JSONResult
package com.lst.util;
public class JSONResult {
// 響應業務狀態
private Integer status;
// 響應消息
private String msg;
// 響應中的數據
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;
}
}
方法
@RequestMapping("/ok")
@ResponseBody
public JSONResult ok(){
return JSONResult.ok("成功");
}
@RequestMapping("/error")
@ResponseBody
public JSONResult error(){
return JSONResult.errorMsg("失敗");
}
效果展示
ok
error
over。。。