SpringMVC文件上传下载
Spring通过MultipartResolver实现文件上传的。
Spring上传组件定义在org.springframework.web.multipart包中。
默认情况下，Spring MVC上下文中没有装配MultipartResolver。如果要使用Spring的文件上传功能，需要先进行配置。
springmvc.xml中要加上这个
<!--文件上传解析器-->
<bean class="org.springframework.web.multipart.commons.CommonsMultipartResolver" id="multipartResolver">
<property name="maxUploadSize" value="2097152"/>
</bean>
控制层方法:
我也记不住这东西，都是跟着教程敲得，为了有一天能用上，保留在这儿
package top.yibobo.controller;
import org.apache.commons.io.FileUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpSession;
import java.io.File;
import java.io.IOException;
@Controller
public class FileController {
@RequestMapping("/upload")
public String upload(MultipartFile myPic, HttpSession session) throws IOException {
//获得保存文件目录的绝对路径
String path = session.getServletContext().getRealPath("images");
//取得原始文件名
String fileName = myPic.getOriginalFilename();
File file = new File(path,fileName);
//转存文件到指定路径
myPic.transferTo(file);
session.setAttribute("fileName",fileName);
return "suc";
}
@RequestMapping("/download")
public ResponseEntity<byte[]> download(String fileName,HttpSession session) throws IOException {
//获得保存文件目录的绝对路径
String path = session.getServletContext().getRealPath("images");
//要下载的文件
File file = new File(path,fileName);
//响应头部对象数据
HttpHeaders headers = new HttpHeaders();
//定义响应内容类型为流
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
//通知浏览器以附件形式保存文件
headers.setContentDispositionFormData("attachment",fileName);
return new ResponseEntity<>(FileUtils.readFileToByteArray(file),headers, HttpStatus.OK);
}
}
pom.xml中需要加上这个
<!--文件上传下载-->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.2</version>
</dependency>
上传下载的jsp文件
<%--
Created by IntelliJ IDEA.
User: pyb
Date: 2018/6/25
Time: 13:58
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<%@include file="commons/basePath.jsp"%>
<title>上传</title>
<form action="upload" method="post" enctype="multipart/form-data">
<p>请选择上传文件<input type="file" name="myPic"></p>
<p><input type="submit" value="提交"></p>
</form>
</head>
<body>
</body>
</html>
<%--
Created by IntelliJ IDEA.
User: pyb
Date: 2018/6/25
Time: 14:15
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<%@include file="commons/basePath.jsp"%>
<title>tupian</title>
</head>
<body>
<div>
<img src="images/${fileName}">
<p><a href="download?fileName=${fileName}">点击下载</a></p>
</div>
</body>
</html>
