Java取得一个页面的源代码

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;



public class getHtml {

    public static void  main(String[] args) throws IOException{
        String str = "";
        getHtml BAIDU = new getHtml();
        BAIDU.get(str);
    }
    public void get(String str){
    BufferedReader reader = null;
    StringBuilder pageBuffer = null;
    try{
    URL pageUrl = new URL(str);
    reader  = new BufferedReader (new InputStreamReader(pageUrl.openStream()));
    String line;
    pageBuffer = new StringBuilder();
    while ((line = reader.readLine()) != null) {
        pageBuffer.append("\n");
        pageBuffer.append(line);
    }
    reader.close();
    } catch (MalformedURLException e) {
           e.printStackTrace();
    }catch (IOException e) {
       e.printStackTrace();
    }

    System.out.println(pageBuffer);
    }

    }