JavaWeb中上传和下载文件实例代码

JavaWeb中上传和下载文件实例代码

一丶先引入上传下载的lib

二丶上传的的servlet

三丶下载的servlet

package com.test.action;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.OutputStream;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HtOJasZJwzvstpServletRequest;

import javax.servlet.http.HttpServletResponse;

@WebServlet("/download")

public class FileDownloadAction extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

String id = request.getParameter("id");

// 根据主键读取文件的真实名字 + 服务器上的名字

processDownload("1444442288605.png", "腾讯.png", request, response);

}

private boolean processDownload(String fileName, String saveName,

HttpServletRequest request, HttpServletResponse response) {

boolean success = true;

// 获取文件下载所在的路径

String path = request.getServletContext().getRealPath("/upload");

File fileLoad = new File(path, fileName); // 下载文件

long fileLength = fileLoad.length(); // 文件大小

byte[] buffer = new byte[1024]; // 缓冲字节数组

try {

response.reset();

response.setHeader("Content-disposition", "attachment;filename=\""

+ new String(saveName.getBytes("gb2312"), "ISO-8859-1") + "\"");

response.setContentType("application/octet-stream");

response.setHeader("Content_Length", String.valueOf(fileLength));

OutputStream os = response.getOutputStream();

FileInputStream in = new FileInputStream(fileLoad);

int hasRead = 0;

while ((hasRead = in.read(buffer)) != -1) {

os.write(buffer, 0, hasRead);

}

os.flush();

os.close();

in.close();

} catch (IOException e) {

success = false;

e.printStackTrace();

}

return success;

}

}

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