十七、網絡協議之Http協議的應用初體驗

下面的示例程序是HTTP協議使用HttpClient接口的應用示例，其用意是將請求裏的數據封裝後，通過http協議提交請求。先寫下了備用。

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.PostMethod;

public class InvokeExternal{

  private ThreadLocal<HttpClient> threadLocal = new ThreadLocal<HttpClient>();

  String url = "";//某url

  public  void initOperate(){

     HttpClient client = threadLocal.get();

     if(client == null){

       client = new HttpClient();

       client.setConnectionTimeout(5000);

       client.setTimeout(2000);

       client.setHttpConnectionFactoryTimeout(5000);

       threadLocal.set(client);

     }

     // setHost方法的三個參數(String host, int port, String protocol) 

     //"http"通過這樣的方式Protocol.getProtocol(“http”)指定是HTTP協議

     client.getHostConfiguration().setHost(host,8080,"http"); 

     PostMethod postMethod = new PostMethod(url);

     NameValuePair[]  parametersBody = {new NameValuePair("param1","param1value"),new NameValuePair("param2","param2value")};//將參數放入NameValuePair數組

     postMethod.setRequestBody(parametersBody);

     client.executeMethod(postMethod);

     String value = postMethod.getResponseBodyAsString();

      //對返回值進行處理

  }

}