写了一个搜索引擎的下载模块，大家伙儿给看看能不能用吧，希望大家多提点意见

 
 public class getpage { //用于下载网页文档 
  
 	/** 
 	 * @param args 
 	 */ 
 	public static void main(String[] args) { 
 		// TODO Auto-generated method stub 
 		try{ 
 			int sum=0; 
 			BufferedReader reader=new BufferedReader(new InputStreamReader(new FileInputStream("config.txt"))); 
 			while(true) 
 			{ 
 				String add=reader.readLine(); 
 				if(add==null)break; 
 				Socket s=new Socket(add.substring(0, add.indexOf("/")),80); 
 				DataInputStream in=new DataInputStream(s.getInputStream()); 
 				DataOutputStream out=new DataOutputStream(s.getOutputStream()); 
 				PrintStream outp=new PrintStream(out); 
 				outp.println("GET /"+add.substring(add.indexOf("/")+1, add.length())+" HTTP/1.1"); 
 				outp.println("Host: "+add.substring(0, add.indexOf("/"))); 
 				outp.println("Connection: Keep_Alive"); 
 				outp.println(); 
 				byte b[]=new byte[100000]; 
 				in.read(b); 
 				String string=new String(b); 
 				string=string.substring(string.indexOf(" <"), 1+string.lastIndexOf(">")); 
 				 
 				PrintStream file=new PrintStream("page"+sum+++".txt"); 
 				file.println(add.substring(0, add.lastIndexOf("/")+1)); 
 				file.println(string); 
 				s.close(); 
 			} 
 		}catch(Exception e){System.out.println(e);} 
 	} 
 } 
 public class gettext { //用于提取网页文本 
  
 	/** 
 	 * @param args 
 	 */ 
 	public static void main(String[] args) { 
 		try{ 
 			FileInputStream input=new FileInputStream("page.txt"); 
 			PrintStream out=new PrintStream("url.txt"); 
 			byte b[]=new byte[100000]; 
 			input.read(b); 
 			String s=new String(b); 
 			s=s.replaceAll("\n", ""); 
 			s=s.replaceAll(" ", ""); 
 			s=s.replaceAll("&nbsp;", ""); 
 			int first=0; 
 			while(true) 
 			{ 
 				first=s.indexOf(">",first+1); 
 				if(first==-1)break; 
 				int second=s.indexOf(" <",first); 
 				if(second==-1)break; 
 					out.print(s.substring(first+1, second)); 
 			} 
 		}catch(Exception e){System.out.println(e);} 
 	} 
 } 
 public class geturl {   //用于在指定网页文档中提取URL 
  
 	/** 
 	 * @param args 
 	 */ 
 	public static void main(String[] args) { 
 		// TODO Auto-generated method stub 
 		try{ 
 			PrintStream out=new PrintStream("url.txt"); 
 			int i=0; 
 			while(true) 
 			{ 
 				BufferedReader reader=new BufferedReader(new InputStreamReader(new FileInputStream("page"+i+++".txt"))); 
 				String a=reader.readLine(); 
 				while(true) 
 				{ 
 					String url=reader.readLine(); 
 					if(url==null)break; 
 					int first=url.indexOf(".htm"); 
 					if(first==-1)continue; 
 					for(;url.charAt(first)!='\"';first--);first++; 
 					int second; 
 					for(second=first+1;url.charAt(second)!='\"'||second>=url.length();second++);second--; 
 					if(first>=second)continue; 
 					if(url.indexOf("www")==-1&&url.indexOf("http")==-1) 
 						out.println(a+url.substring(first,second+1)); 
 				} 
 			} 
 		}catch(Exception e){System.out.println(e); 
 		} 
 	} 
 }