<%--
Created by IntelliJ IDEA.
User: 13554
Date: 2019/12/23
Time: 22:16
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<a href="download?fileName=a.txt">下载</a>
</body>
</html>
下载界面
文件下载的主要方法
byte[] bytes=FileUtils.readFileToByteArray(file);
outputStream.write(bytes);
package com.qyx.controller;
import org.apache.commons.io.FileUtils;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.util.UUID;
@Controller
public class DemoController {
@RequestMapping("/download")
public void download(String fileName, HttpServletResponse response, HttpServletRequest request) throws IOException {
response.setContentType("text/html;charset=UTF-8");
//设置响应流中的文件进行下载
//response.setHeader("Content-Disposition","attachment;filename"+fileName);
response.setHeader("Content-Disposition","attachment;filename="+fileName);
//ServletOutputStream outputStream=response.getOutputStream();
ServletOutputStream outputStream=response.getOutputStream();
//获取文件完整路径(绝对路径)
//String realPath=request.getServletContext().getRealPath("files");
String realPath=request.getServletContext().getRealPath("files");
//File file=new File(realPath,fileName);
File file=new File(realPath,fileName);
//byte[] bytes=FileUtils.readFileToByteArray(file);
byte[] bytes=FileUtils.readFileToByteArray(file);
outputStream.write(bytes);
outputStream.flush();
outputStream.close();
}}
控制文件下载的控制器
<%--
Created by IntelliJ IDEA.
User: 13554
Date: 2019/12/25
Time: 16:48
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<!--需要设置enctype="multipart/form-data"才能进行文件上传-->
<form method="post" enctype="multipart/form-data" action="upload">
姓名:<input type="text" name="name">
文件:<input type="file" name="file">
<input type="submit" value="提交">
</form>
</body>
</html>
package com.qyx.controller;
import org.apache.commons.io.FileUtils;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.util.UUID;
@Controller
public class DemoController {
@RequestMapping("/upload")
public String upload(MultipartFile file,String name) throws IOException {
//String fileName=file.getOriginalFilename();
String fileName=file.getOriginalFilename();
//String suffix=fileName.substring(fileName.lastIndexOf("."));
String suffix=fileName.substring(fileName.lastIndexOf("."));
if (suffix.equalsIgnoreCase(".txt"))
{
//为防止文件重名而设置的随机ID
String uuid= UUID.randomUUID().toString();
FileUtils.copyInputStreamToFile(file.getInputStream(),new File("E:/"+uuid+suffix));
return "success";
}
return "error";
}}
文件上传
1 基于apache的commons-fileupload.jar完成文件上传
2 MultipartResovler作用
2.1 把客户端上传的文件流转换成MultipartFile封装类
2.2 通过MultipartFile封装类获取到文件流
3 表单数据类型分类
3.1 在form的enctype属性控制表单类型为 "multipart/form-data"
4 控制器中MultipartFile的参数名必须和input file标签里的name属性值保持一致
5 文件上传核心方法
FileUtils.copyInputStreamToFile(InputStream,File);
原文地址：https://www.cnblogs.com/qyx66/p/12109708.html
时间： 2024-08-30 03:31:32