获取网络文本资源的java类

import java.io.*;
import java.net.*;
import java.util.*;
public class Test
{
 public static void main(String[] args)
 {
  //POST发送数据，返回http资源
  System.out.println(OpenUrl(" http://www.ip138.com:8080/search.asp","action=mobile&mobile=13910000000&B1=查询"));
  //GET发送数据，返回http资源
  System.out.println(OpenUrl(" http://www.ip138.com:8080/search.asp?action=mobile&mobile=13910000000&B1=查询",""));
  //返回Ftp资源
  System.out.println(OpenUrl( ftp://user:pass@192.168.0.1/book/jdk.txt",""));
 }
 public static String OpenUrl(String urlString,String postParam) {
  StringBuffer document = new StringBuffer();
  try {
    URL url = new URL(urlString);
    URLConnection conn = url.openConnection();
    if(!postParam.trim().equals("")){
     conn.setDoOutput(true);
     OutputStreamWriter out = new OutputStreamWriter(conn.getOutputStream(), "GBK");
     out.write(postParam);
     out.flush();
     out.close();
    }
    BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
    String line = null;
    while ( (line = reader.readLine()) != null) {
   document.append(line + "/n");
    }
    reader.close();
  }
  catch (MalformedURLException e) {
    System.out.println("Unable to connect to URL: " + urlString);
  }
  catch (IOException e) {
    System.out.println("IOException when connecting to URL: " + urlString);
  }
  return document.toString();
 }
}