Java HTTP客戶端 http4j

http4j是一個開源的Java HTTP客戶端，主要是源自對工作中的一個項目設計的不滿和擴展Apache HttpComponent比較麻煩。

不同于Apache HttpComponent (HttpClient)之處在于:

1. 專注于“客戶端”定位：省去很多不必要的抽象層以及功能，如解析HTTP請求等。
2. 立足于方便易用：從主頁的例子中可以看出使用http4j是極其方便的。
3. 原生的較完善的數據統計: DNS解析耗時，request發送耗時，等待耗時，response接收耗時,字節數等等。這個是為了方便關注網站性能或者流量開銷（購買云計算服務時會特別關注自己的成本）的應用。在Apache的項目中，使用者需要定義自己的Proxy才能實現此功能。示例代碼：

package com.google.code.http4j.example;

import java.io.IOException;
import java.net.URISyntaxException;

import com.google.code.http4j.Client;
import com.google.code.http4j.Response;
import com.google.code.http4j.impl.BasicClient;
import com.google.code.http4j.utils.Metrics;

public class BasicExample {

        public static void main(String[] args) throws InterruptedException, IOException, URISyntaxException {
                Client client = new BasicClient();
                Response response = client.get("http://code.google.com/p/http4j/");
                Metrics metrics = response.getMetrics();
                System.out.println("Bytes sent:" + metrics.getBytesSent());
                System.out.println("Bytes received:" + metrics.getBytesReceived());
                System.out.println("Blocking cost:" + metrics.getBlockingCost());
                System.out.println("DNS lookup cost:" + metrics.getDnsLookupCost());
                System.out.println("Connection establish cost:" + metrics.getConnectingCost());
                System.out.println("Sending cost:" + metrics.getSendingCost());
                System.out.println("Waiting cost:" + metrics.getWaitingCost());
                System.out.println("Receiving cost:" + metrics.getReceivingCost());
                System.out.println("SSL handshake cost:" + metrics.getSslHandshakeCost());
                response.output(System.out);
                client.shutdown();
        }
}

項目主頁：http://www.baiduhome.net/lib/view/home/1326029865250