Java的HttpClient的实现

HttpClient的概念就是模仿浏览器请求服务端内容，也可以做App和Server之间的链接。

这个是关于Java的HttpClient的简单实例，其实java本身也可以通过自己的net包去做，但是在应用上还是HttpClient方便很多

地址是：http://hc.apache.org/downloads.cgi 
下面是java的实例（这里使用了json的jar包，可以前往http://mvnrepository.com/artifact/org.json/json去寻找下载）：

注意：jdk1.8

import java.io.IOException;

import org.apache.http.Header;

import org.apache.http.HttpResponse;

import org.apache.http.HttpStatus;

import org.apache.http.client.ClientProtocolException;

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

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

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

import org.apache.http.message.BasicHeader;

import org.apache.http.util.EntityUtils;

import org.json.JSONException;

import org.json.JSONObject;

import org.json.JSONTokener;

public class WebSiteRequest {

    public static void main(String args[]) {

        String reqUri = "https://xxx.com";

        String parm = "data=0_0_1"

        CloseableHttpClient httpclient = HttpClients.createDefault();

        try {

            HttpResponse response = null;

            HttpPost httpPost = new HttpPost(reqUri + "?" + parm);

            Header ContentTypeHeader = new BasicHeader("Content-Type", "application/x-www-form-urlencoded");

            httpPost.addHeader(ContentTypeHeader);

            try {

                response = httpclient.execute(httpPost);

            } catch (ClientProtocolException e) {

                e.printStackTrace();

            } catch (IOException e) {

                e.printStackTrace();

            }

            int statusCode = response.getStatusLine().getStatusCode();

            String getResult = null;

            if (statusCode != HttpStatus.SC_OK) {

                System.out.println("error status code: " + statusCode);

            } else {

                try {

                    getResult = EntityUtils.toString(response.getEntity());

                } catch (IOException ioException) {

                    ioException.printStackTrace();

                }

            }

            if (getResult != null) {

                JSONObject jsonObject = null;

                try {

                    jsonObject = (JSONObject) new JSONTokener(getResult).nextValue();

                    System.out.println("retcode: " + jsonObject.getString("retcode"));

                } catch (JSONException jsonException) {

                    jsonException.printStackTrace();

                }

            }

        } finally {

            try {

                httpclient.close();

            } catch (IOException e) {

                e.printStackTrace();

            }

        }

    }

}