java文件下载
2021-04-30 13:26
标签：context except attach 一个 byte ext ati command 直接 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... 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。 java文件下载 标签：context except attach 一个 byte ext ati command 直接 原文地址：https://www.cnblogs.com/yadongliang/p/13209668.html文件下载
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" >downloadtest1a>
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;
}
%>
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