HttpClient4基础1--通过匿名代理访问网页

HttpClient发布4.0了 而且底层完全重写了，据说无论是效率还是结构都有质的飞跃。
现在也要与时具进，研究研究。

package test.httpclient4.proxy;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.StatusLine;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.params.ConnRoutePNames;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicStatusLine;
import org.apache.http.util.EntityUtils;


public class GetHttpByProxy {

	public static void main(String[] args) throws ClientProtocolException,
			IOException {
		//实例化一个HttpClient
		HttpClient httpClient = new DefaultHttpClient();
		//设定目标站点
		HttpHost httpHost = new HttpHost("www.shanhe114.com");
		//设置代理对象 ip/代理名称,端口
		HttpHost proxy = new HttpHost("192.168.1.28", 5608);
		//对HttpClient对象设置代理
		httpClient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY,
				proxy);
		HttpGet httpGet = new HttpGet("/");
		//这里也可以直接使用httpGet的绝对地址，当然如果不是具体地址不要忘记/结尾
		//HttpGet httpGet = new HttpGet("http://www.shanhe114.com/");
		//HttpResponse response = httpClient.execute(httpGet);
		
		HttpResponse response = httpClient.execute(httpHost, httpGet);
		if(HttpStatus.SC_OK==response.getStatusLine().getStatusCode()){
			//请求成功
			//取得请求内容
			HttpEntity entity = response.getEntity();
			//显示内容
			if (entity != null) {
				// 显示结果
				BufferedReader reader = new BufferedReader(new InputStreamReader(entity
						.getContent(), "UTF-8"));
				String line = null;
				StringBuffer strBuf = new StringBuffer((int) entity.getContentLength());
				while ((line = reader.readLine()) != null) {
					strBuf.append(line);
				}
				strBuf.trimToSize();
				System.out.println(strBuf.toString());
			}
			if (entity != null) {
				entity.consumeContent();
			}
		}
	}
}

对于显示将结果转换成String以备后续使用，HttpClient已经为我们提供了一个简便方法
如下

System.out.println(EntityUtils.toString(entity,"utf-8"));

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