httpclient获取指定的网页

package com.tender.news.crawler;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
public class HttpClientGet{
public String getHtml(String url){
    String result="";
//String url="http://www.ahbc.com.cn/bulletin.aspx?ID=1";
//构造HttpClient的实例
HttpClient httpClient = new HttpClient();
//创建GET方法的实例
GetMethod getMethod = new GetMethod(url);
//使用系统提供的默认的恢复策略
getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
new DefaultHttpMethodRetryHandler());
//定义一个输入流
InputStream ins = null;
//定义文件流
BufferedReader br =null;
try {
  //执行getMethod
  int statusCode = httpClient.executeMethod(getMethod);
  if (statusCode != HttpStatus.SC_OK) {
  System.err.println("方法失败: "+ getMethod.getStatusLine());
  }
  //使用getResponseBodyAsStream读取页面内容，这个方法对于目标地址中有大量数据需要传输是最佳的。
  ins = getMethod.getResponseBodyAsStream();
  String charset = getMethod.getResponseCharSet();
  System.out.println("编码是？"+charset);
  if(charset.toUpperCase().equals("ISO-8859-1")){
  charset = "gbk";
  }
  //按服务器编码字符集构建文件流，这里的CHARSET要根据实际情况设置
  br = new BufferedReader(new InputStreamReader(ins,getMethod.getResponseCharSet()));
  StringBuffer sbf = new StringBuffer();
  String line = null;
  while ((line = br.readLine()) != null)
  {
  sbf.append(line);
  }
  result = new String(sbf.toString().getBytes(getMethod.getResponseCharSet()),charset);
  //输出内容
//  System.out.println(result);
  //服务器编码
  System.out.println("服务器编码是："+getMethod.getResponseCharSet());
} catch (HttpException e) {
  //发生致命的异常，可能是协议不对或者返回的内容有问题
  System.out.println("请检查您所提供的HTTP地址！");
  e.printStackTrace();
} catch (IOException e) {
  //发生网络异常
  e.printStackTrace();
} finally {
  //关闭流，释放连接  
try {
ins.close();
br.close();}
catch (IOException e) {
e.printStackTrace();
}
getMethod.releaseConnection();
}
return result;
}

}