用JSP抓取网址

import Java.io.*;
import java.net.*;
import java.util.*;

class url2htm{

static private url2htm instance; // Create the only instance of the class

public static String strURL=""; // Announce the universial variable to mark the destination URL

public static String strFile=""; // Announce the universial variable to mark the local file path

/**
* Construct the private function to prevent other
* Application from creating the instance of this class
*/
private url2htm(){

init();

}
/**
* The main function that will invoke the application
*/
public static void main(String args[]){

url2htm instUrl2htm = new url2htm(); // Create the instance of the default class

instUrl2htm.write(); // Invoke the chief function
}

/**
* The setProperties() function will set the two major
* variables to the class
* @para propNames
* @para name
*/
private void setProperties(Properties props){

Enumeration propNames = props.propertyNames();

while(propNames.hasMoreElements()){

String name = (String) propNames.nextElement();

if(name.endsWith(".url")){

String WebName = name.substring(0,name.lastIndexOf("."));

strURL = props.getProperty(webName ".url");

strFile = props.getProperty(webName ".file");

}
}
}

/**
* The getURL() function will return the URL string
*/
private void getURL(){

System.out.println(strURL);

}

/**
* The getFile() function will return the local file and path
*/
private void getFile(){

System.out.println(strFile);

}

/**
* The write() function will read the dest URL as input stream and
* Write into a local file
* @para fileline
* @para url
*/
private static void write(){

String fileline;

String url = strURL;

try {

URL destURL = new URL(url);

InputStream in = destURL.openStream();

BufferedReader filedata = new BufferedReader(new InputStreamReader(in));

FileOutputStream out = new FileOutputStream(strFile);

PrintStream prtStream = new PrintStream(out);

while ((fileline = filedata.readLine()) != null) {

prtStream.println(fileline "\n");

}
prtStream.close();

}

catch (IOException e) {

System.out.println("Error in I/O:" e.getMessage());

}

}

/**
* The init() function will read the property file and set the
* Class'' constants
* @para is: the input stream
* @para webProp: the web site properties
*/
private void init()
{

InputStream is = getClass().getResourceAsStream("web.properties"); // Data input stream

Properties webProps = new Properties();

try
{
webProps.load(is);
}

catch (Exception e)
{
System.err.println("Can''t read the property file. " "Please make sure the property file is in its path");
return;
}
setProperties(webProps);
}
}

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