HttpClient你认为就是几句代码就解决了？？

HttpClient你认为就是几句代码就解决了？？如果你这样想，那你只是处于网络学习阶段了(能够完成网络请求的功能而已)，还没有达到项目级别，虽然现在Android studio中HttpClient已经不让开发者使用，但是HttpClient的使用范围依然广泛，不说空话了，直接贴代码出来看看。

这就是那简单的几段代码，就能够完成HttpClient的GET请求：

try{

//创建一个默认的HttpClient

HttpClient httpclient=new DefaultHttpClient();

//创建一个GET请求

HttpGet request=new HttpGet("www.nsusoft.com");

//发送GET请求

HttpResponse response = httpClient.execute(request)；

}catch(Exception e) {

e.printStackTrace();

}

但是这段代码中：

HttpClient  httpclient = new DefaultHttpClient();

这段代码，让我们没有考虑到真实环境，如代码的容错等等

其实在发送HTTP通信请求是，很可能在很多地方都能够运用到，我们其实不用每个请求都在创建一个HttpClient，HttpClient就像一个小的浏览器，对整个应用只需要，创建一个HttpClient就够了。

packagecom.caishaohua.internet.request;

importorg.apache.http.client.HttpClient;

importorg.apache.http.impl.client.DefaultHttpClient;

/**

* Created by Administrator on 2016/6/19.

*/

public classCustomerHttpClient {

private staticHttpClientcustomerHttpClient;

privateCustomerHttpClient(){}

public staticHttpClient getHttpClient(){

if(null==customerHttpClient){

customerHttpClient=newDefaultHttpClient();

}

returncustomerHttpClient;

}

}

但是当我们需要有多个请求咋办？我们会很容易想到使用多线程来完成，我们的应用程序使用同一个HttpClient来管理所有的Http请求，一旦出现并发请求，那么一定会出现多线程的问题。其实HttpClient提供了创建线程安全对象的API让我们调用：

packagecom.caishaohua.internet.request;

importorg.apache.http.HttpVersion;

importorg.apache.http.client.HttpClient;

importorg.apache.http.conn.ClientConnectionManager;

importorg.apache.http.conn.params.ConnManagerParams;

importorg.apache.http.conn.scheme.PlainSocketFactory;

importorg.apache.http.conn.scheme.Scheme;

importorg.apache.http.conn.scheme.SchemeRegistry;

importorg.apache.http.impl.client.DefaultHttpClient;

importorg.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;

importorg.apache.http.params.BasicHttpParams;

importorg.apache.http.params.HttpConnectionParams;

importorg.apache.http.params.HttpParams;

importorg.apache.http.params.HttpProtocolParams;

importorg.apache.http.protocol.HTTP;

importorg.apache.http.protocol.HttpProcessor;

/**

* Created by Administrator on 2016/6/19.

*/

public class SafetyCustomerHttpClient {

private static final String CHARSET= HTTP.UTF_8;

private static HttpClient custormerHttpClient;

private SafetyCustomerHttpClient(){

}

public static synchronized  HttpClient getHttpClient(){

if(null==custormerHttpClient){

HttpParams httpParams =new BasicHttpParams();

//设置基本参数

HttpProtocolParams.setVersion(httpParams, HttpVersion.HTTP_1_1);

HttpProtocolParams.setContentCharset(httpParams,CHARSET);

HttpProtocolParams.setUseExpectContinue(httpParams,true);

HttpProtocolParams.setUserAgent(httpParams,""+

"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:47.0) Gecko/20100101 Firefox/47.0");

//超时设置

//从连接池获取连接的
4000
超时时间

ConnManagerParams.setTimeout(httpParams,8000);

//连接超时

HttpConnectionParams.setConnectionTimeout(httpParams,8000);

//请求超时

HttpConnectionParams.setSoTimeout(httpParams,8000);

//这种HttpClient支持http和https两种模式

SchemeRegistry  schemeRegistry =new SchemeRegistry();

schemeRegistry.register(newScheme("http", PlainSocketFactory.getSocketFactory(),80));

schemeRegistry.register(newScheme("https",PlainSocketFactory.getSocketFactory(),443));

//使用线程安全的连接管理来创建HttpClient

ClientConnectionManager connectionManager =new  ThreadSafeClientConnManager(httpParams,schemeRegistry);

custormerHttpClient=new DefaultHttpClient(connectionManager,httpParams);

}

returncustormerHttpClient;

}

}

在代码中，通过getHttpClient方法给HttpClient配置基本的设置，然后在使用ThreadSafeClientConnManager()来创建HttpClient。