Apache HttpComponents Client 4.0快速入門/更新-1.GET方法通路網頁

 apache httpcomponents client 4.0已經釋出多時，httpclient項目從commons子項目挪到了httpcomponents子項目下，httpclient3.1和httpcilent4.0無法做到代碼向後相容，更新比較麻煩。我在做項目之餘找時間研究了一下，寫了一套3.1與4.0對比的代碼，不求面面俱到，但求簡單易懂。如果代碼用到真實項目中，還需要考慮諸如代理、header、異常處理之類的問題。

http get方法得到www.g.cn的源碼：

import java.io.ioexception;

import org.apache.commons.httpclient.httpexception;

import org.apache.commons.httpclient.httpstatus;

import org.apache.commons.httpclient.methods.getmethod;

import org.apache.http.client.clientprotocolexception;

import org.apache.http.client.methods.httpget;

import org.apache.http.impl.client.basicresponsehandler;

import org.apache.http.impl.client.defaulthttpclient;

public class getsample {

/**

* @param args

* @throws ioexception

* @throws httpexception

*/

public static void main(string[] args) throws httpexception, ioexception {

string url = "http://www.g.cn/";

system.out.println(url);

system.out.println("visit google using apache commons-httpclient 3.1：");

system.out.println(get3(url));

system.out.println("visit google using apache httpcomponents client 4.0：");

system.out.println(get4(url));

}

/** 使用apache commons-httpclient 3.1，get方法通路網頁 */

public static string get3(string url) throws httpexception, ioexception {

org.apache.commons.httpclient.httpclient httpclient = new org.apache.commons.httpclient.httpclient();

getmethod getmethod = new getmethod(url);

try {

if (httpclient.executemethod(getmethod) != httpstatus.sc_ok) {

system.err.println("method failed: " + getmethod.getstatusline());

return getmethod.getresponsebodyasstring();

} finally {

getmethod.releaseconnection();

/** 使用apache httpcomponents client 4.0，get方法通路網頁 */

public static string get4(string url) throws clientprotocolexception, ioexception {

org.apache.http.client.httpclient client = new defaulthttpclient();

httpget httpget = new httpget(url);

return client.execute(httpget, new basicresponsehandler());

client.getconnectionmanager().shutdown();