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SpringMVC 文件上传&json处理
SpringMVC文件上传
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相关依赖
<dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.3</version> </dependency>
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springmvc-servlet.xml 配置文件上传解析器
<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>
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upload.jsp
<%-- Created by IntelliJ IDEA. User: Admin Date: 2019/9/29 Time: 20:28 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"> 上传文件:<input type="file" name="img" > <button type="submit">提交</button> </form> </body> </html>
HelloController
@RequestMapping("/upload") public String upload(MultipartFile img) throws IOException { FileUtils.copyInputStreamToFile(img.getInputStream(),new File("D:/yyy/"+img.getOriginalFilename())); return "forward:upload"; }
json处理
在方法上面加上@ResponseBody 注解就OK了
@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);
}
工具类
JSONResult
package com.dj.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;
}
}
@ResponseBody
@RequestMapping("/jsonData3")
public JSONResult jsonData3(){
Map map = new HashMap();
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集合的过程");
}
@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集合的过程");
}