用jsp,读远程文件，保存到本地。
如果你的网站动态内容比较多（频频读取数据库，而数据更新较少，一天一次），你可以将首页转化为HTML静态文件，加快网页下载速度，下面这个JSP文件将index.jsp转化为index.html。
<%@ page import="java.io.*"%>
<%@ page import="java.net.*"%>
<%@ page import="java.util.Properties"%>
<%
//远程文件路径
String s1 = "http://www.java3z.com/cwbwebhome/index.jsp";
//本地存放路径
String s2 = getServletContext().getRealPath("/")+"index.html";
URL urlfile = null;
HttpURLConnection httpUrl = null;
BufferedInputStream bis = null;
BufferedOutputStream bos = null;
File f = new File(s2);
//make proxy
//String proxy = "192.168.224.12";
//String port = "8080";
//Properties systemProperties = System.getProperties();
//systemProperties.setProperty("http.proxyHost",proxy);
//systemProperties.setProperty("http.proxyPort",port);
try{
urlfile = new URL(s1);
httpUrl = (HttpURLConnection)urlfile.openConnection();
httpUrl.connect();
bis = new BufferedInputStream(httpUrl.getInputStream());
}catch(Exception e){
System.out.println(e.toString());
}
try{
bos = new BufferedOutputStream(new FileOutputStream(f));;
byte[] b = new byte[1024];
while(bis.read(b)!=-1) {
bos.write(b);
}
}catch(Exception e){
System.out.println(e.toString());
}finally{
try{
bos.flush();
bis.close();
httpUrl.disconnect();
}catch(Exception e){
out.println(e.toString());
}
}
%>
OK!!
其中
//make proxy
String proxy = "192.168.224.12";//防火墙地址
String port = "8080"; //防火墙端口
Properties systemProperties = System.getProperties();
systemProperties.setProperty("http.proxyHost",proxy);
systemProperties.setProperty("http.proxyPort",port);
这一段是如果你的机器设定了防火墙，需要加上，如果是直接连上网，就不用。
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