httpclient 代理访问

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;

import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HostConfiguration;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpMethodBase;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.URI;
import org.apache.commons.httpclient.URIException;
import org.apache.commons.httpclient.methods.GetMethod;

public class MyProxy {

private HttpClient client;
private HttpMethodBase method;
private byte[] binaryData;
private Header[] headers; // 响应头信息

public MyProxy() {
   this.client = new HttpClient(); // 创建一个HttpClient实例
}

//    配置客户端请求参数
public void config(String proxyHost, int proxyPort, String url) throws URIException, NullPointerException {
   this.method = new GetMethod();
   HostConfiguration hostConfiguration = new HostConfiguration();
   URI uri = new URI(url, true);
   hostConfiguration.setHost(uri);
   this.client.setHostConfiguration(hostConfiguration);
   this.client.getHostConfiguration().setProxy(proxyHost, proxyPort);    // 配置代理IP和端口
}

public void execute() throws HttpException, IOException { // 执行请求
   int status = this.client.executeMethod(this.method);
   if(status == HttpStatus.SC_OK) {
    this.headers = this.method.getResponseHeaders();
    InputStream stream = this.method.getResponseBodyAsStream();
    if(stream != null) {
     ByteArrayOutputStream data = new ByteArrayOutputStream();
     int readCount = 0;
     byte[] buffer = new byte[512];
     while((readCount=stream.read(buffer))>0) {
      data.write(buffer);
     }
     this.binaryData = data.toByteArray();
    }
   }
}

private void printResponseHeaders() { // 打印响应头信息
   for(Header header : this.headers) {
    System.out.println(header.getName() + " : " + header.getValue());
   }
}

private void printStringData(String encoding) throws UnsupportedEncodingException { // 简单编码并打印响应字符串数据
   if(encoding == null) {
    encoding = "utf-8";
   }
   String data = new String(this.binaryData, encoding);
   System.out.println(data);
}

public static void main(String[] args) throws Exception 
{
	System.setProperty( "org.apache.commons.logging.Log", "org.apache.commons.logging.impl.NoOpLog" );
	
   String url = "http://www.163.com"; //   无法通过浏览直接器访问，你可以找到一个需要使用代理访问的网站
   MyProxy mp = new MyProxy();
   String proxyHost = "72.36.112.71";
   int proxyPort = 3124;
   mp.config(proxyHost, proxyPort, url);
   mp.execute();
   mp.printStringData(null);
   mp.printResponseHeaders();
}

}