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。
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