java文件下载
Posted 习惯沉淀
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文件下载
大家都知道在web页面上如果一个有个连接,连接的的是文本文件,当左键点击的话会查看这个文件,右键点击可以下载.但是如果是windows不识别的文件,左键点击直接就下载了比如zip,那如何点击左键直接下载.txt的文本文件呢.请帮助...
jsp方式
<meta http-equiv="Content-Type" content="text/html; charset=gbk"> <HTML> <HEAD> </HEAD> <BODY> <a href = "download1.jsp?filepath=d:\&filename=1a.txt" >downloadtest1</a> </BODY> </HTML>
文件在本地服务器(download.jsp)
<% String filename = request.getParameter("filename");//"1a.txt"; String filepath = request.getParameter("filepath");//"d:\"; int i = 0; response.setContentType("application/octet-stream"); response.setHeader("Content-Disposition","attachment;filename = "+filename); java.io.FileInputStream fileInputStream = new java.io.FileInputStream(filepath+filename); while((i= fileInputStream.read()) != -1){ out.write(i); } %>
文件在远程服务器(download.jsp)
<%@ page language="java" pageEncoding="UTF-8" contentType="text/html; charset=utf-8" %> <%@ page import="java.util.*"%> <%@ page import="java.net.HttpURLConnection"%> <%@ page import="java.net.URL"%> <%@ page import="java.net.URLEncoder"%> <%@ page import="java.io.DataInputStream" %> <%@ page import="java.io.OutputStream" %> <% //远程文件名及路径 String file = request.getParameter("file"); //下载到本地的文件名 String localName = file.substring( file.lastIndexOf("/")+1 ); //解决中文文件名乱码 localName = new String(localName.getBytes("gb2312"),"iso8859-1"); response.reset() ; response.setContentType("application/force-download"); response.addHeader("Content-Disposition","attachment;filename="+localName ); URL url = null; DataInputStream in = null; HttpURLConnection connection = null; OutputStream outputStream = null ; try{ url = new URL(file); connection = (HttpURLConnection) url.openConnection(); in = new DataInputStream(connection.getInputStream()); outputStream = response.getOutputStream(); byte[] buffer = new byte[4096]; int count = 0; while((count= in.read()) != -1){ outputStream.write(count); } } catch (Exception e) { e.printStackTrace(); out.write("下载文件出错"); out.write(e.getMessage()); }finally{ outputStream.flush(); if( in != null ) { in.close(); in = null;} out.clear(); out = pageContext.pushBody(); if( in != null ) { in.close(); in = null;} connection.disconnect(); url = null; } %>
这是被调用的download1.jsp，这个jsp就是执行直接下载文件的不管是txt还是word文档都可以直接下载。
js方式（可能会有安全方面的提示）
function svcode() { var winname = window.open(‘D:/Project/cimissworkspace/GDS/WebContent/js/jquery.min.js‘, ‘_blank‘, ‘height=1,width=1,top=200,left=300‘); winname.document.open(‘text/html‘, ‘replace‘); winname.document.writeln(obj.value); winname.document.execCommand(‘saveas‘,‘‘,‘code.txt‘); winname.close(); }
感谢
https://blog.csdn.net/leolu007/article/details/7835729
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