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java下载文件
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java下載文件
只是普及：如果下載的文件是壓縮文件 給該文件添加超鏈接會直接下載 如果是圖片 視頻 則需要以下代碼
java頁面
package cn.ybzy.mvcproject.utils;import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/*** Servlet implementation class DownLoad*/
@WebServlet("/DownLoad")
public class DownLoad extends HttpServlet {private static final long serialVersionUID = 1L;/*** @see HttpServlet#HttpServlet()*/public DownLoad() {super();// TODO Auto-generated constructor stub}/*** @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)*/protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubString filename = request.getParameter("filename");response.setContentType("application/octet-stream");response.setCharacterEncoding("utf-8");response.setHeader("Content-Disposition", "attachment;filename=" + filename);OutputStream write= response.getOutputStream();String path = request.getServletContext().getRealPath(File.separatorChar+"down"+File.separatorChar+filename);InputStream in=new FileInputStream(path);byte[] buffer=new byte[1024];int len=0;int i=0;while ((i = in.read(buffer)) != -1) {write.write(buffer, 0, i);write.flush();} }}
jsp頁面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><base href="<%=basePath%>"><title>下載測試</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><h1>servlet下載</h1><div><a href="${pageContext.request.contextPath}/DownLoad?filename=a.jpg">a.jpg下載</a><br><a href="${pageContext.request.contextPath}/DownLoad?filename=b.zip">b.zip下載</a></div></body>
</html>
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