提供了可重用的客户端验证、HTTP状态管理、HTTP连接管理组件，简化HTTP客户端和服务器进行各种通信编程。

缺失一些包可以导入httpcomponents-client-4.5.5-bin.zip

org.apache.http的相关类，android高版本SDK需要用到，解决'The import org.apache.http.HttpEntity cannot be resolved'>等问题： > ★org.apache.http.NameValuePair. Fix the build path then try building this project > ★The type org.apache.http.NameValuePair cannot be resolved. It is indirectly referenced from required .class > ★BasicNameValuePair cannot be resolved to a type > ★HttpPost cannot be resolved to a type > ★NameValuePair cannot be resolved to a type > ★HttpClient cannot be resolved to a type > ★Http cannot be resolved to a variable > ★HttpEntity cannot be resolved to a type > ★EntityUtils cannot be resolved > ★HttpResponse cannot be resolved to a type > ★DefaultHttpClient cannot be resolved to a type