利用jsp读取远程文件保存到本地

本文介绍利用jsp读取远程文件保存到本地的文章专题。

用jsp,读远程文件，保存到本地

读取网络文件有些不一样，我给你一个完整的代码吧，存成jsp就可以直接运行的。
<%@ page import="java.io.*"%>
<%@ page import="java.net.*"%>
<%@ page import="java.util.Properties"%>
<%

//?程文件路径
String s1 = "http://www.google.co.jp";
//本地存放路径
String s2 = "C:\\test.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{
//?接指定的网??源,?取网??入流
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){
System.out.println(e.toString());?
}
}
?
%>
<center>
<form name="search" action="results.jsp" method="get">
<p>
<input name="query" size="44"/>&nbsp;Search Criteria
</p>
<p>
<input name="maxresults" size="4" value="100"/>&nbsp;Results Per Page&nbsp;
<input type="submit" value="Search"/>
</p>
??????? </form>
</center>
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。

评论

2 楼 zhao103804 2010-07-16  

http://www.google.co.jp

zhao103804 写道

我怎么感觉你写的太麻烦点了吧，直接抓取那个页面不就行了吗？

public static void main(String[] args) {
String url = "http://webservice.webxml.com.cn/WebServices/WeatherWS.asmx/getRegionProvince";
url="http://vip.ibook8.com/2008/8/thinkingjava4th.rar";
String savepath = "f:\\thinkingjava4th.txt";
getAndSave(url,savepath);
}

public static void getAndSave(String url,String path) {
InputStream inputStream = null;
try {
URL surl = new URL(url);
URLConnection uc = surl.openConnection();
uc.connect();
inputStream = uc.getInputStream();
FileOutputStream fos=new FileOutputStream(path);
byte[] b = new byte[1024];
int len = 0;
while ((len = inputStream.read(b)) > 0) {
fos.write(b, 0, len);
}
inputStream.close();
fos.flush();
fos.close();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

那个URL改成url=“http://www.google.co.jp” 
savepath=“C:\\test.html”

1 楼 zhao103804 2010-07-16  

我怎么感觉你写的太麻烦点了吧，直接抓取那个页面不就行了吗？

public static void main(String[] args) {
String url = "http://webservice.webxml.com.cn/WebServices/WeatherWS.asmx/getRegionProvince";
url="http://vip.ibook8.com/2008/8/thinkingjava4th.rar";
String savepath = "f:\\thinkingjava4th.txt";
getAndSave(url,savepath);
}

public static void getAndSave(String url,String path) {
InputStream inputStream = null;
try {
URL surl = new URL(url);
URLConnection uc = surl.openConnection();
uc.connect();
inputStream = uc.getInputStream();
FileOutputStream fos=new FileOutputStream(path);
byte[] b = new byte[1024];
int len = 0;
while ((len = inputStream.read(b)) > 0) {
fos.write(b, 0, len);
}
inputStream.close();
fos.flush();
fos.close();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}