用JSP抓取网址

答案：
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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