<%-- 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);