CloseableHttpResponse

最近在使用Apache的httpclient的时候，maven引用了最新版本4.3,发现Idea提示DefaultHttpClient等常用的类已经不推荐使用了，之前在使用4.2.3版本的时候，还没有被deprecated。去看了下官方文档，确实不推荐使用了，点击此处详情。

• DefaultHttpClient —> CloseableHttpClient
• HttpResponse —> CloseableHttpResponse

官方给出了新api的样例，如下。

Get方法：

    CloseableHttpClient httpclient = HttpClients.createDefault();
    HttpGet httpGet = new HttpGet("http://targethost/homepage");
    CloseableHttpResponse response1 = httpclient.execute(httpGet);
    // The underlying HTTP connection is still held by the response object
    // to allow the response content to be streamed directly from the network socket.
    // In order to ensure correct deallocation of system resources
    // the user MUST either fully consume the response content  or abort request
    // execution by calling CloseableHttpResponse#close().
    //建立的http连接，仍旧被response1保持着，允许我们从网络socket中获取返回的数据
    //为了释放资源，我们必须手动消耗掉response1或者取消连接（使用CloseableHttpResponse类的close方法）

    try {
        System.out.println(response1.getStatusLine());
        HttpEntity entity1 = response1.getEntity();
        // do something useful with the response body
        // and ensure it is fully consumed
        EntityUtils.consume(entity1);
    } finally {
        response1.close();
    }

Post方法：

    HttpPost httpPost = new HttpPost("http://targethost/login");
    //拼接参数
    List  nvps = new ArrayList ();
    nvps.add(new BasicNameValuePair("username", "vip"));
    nvps.add(new BasicNameValuePair("password", "secret"));
    httpPost.setEntity(new UrlEncodedFormEntity(nvps));
    CloseableHttpResponse response2 = httpclient.execute(httpPost);

    try {
        System.out.println(response2.getStatusLine());
        HttpEntity entity2 = response2.getEntity();
        // do something useful with the response body
        // and ensure it is fully consumed
        //消耗掉response
        EntityUtils.consume(entity2);
    } finally {
        response2.close();
    }

再往下看HttpClients的源码，具体的实现都在HttpClientBuilder的build方法中，有兴趣的可以去apache看源码。

    /**
    * Creates {@link CloseableHttpClient} instance with default
    * configuration.
    */
    public static CloseableHttpClient createDefault() {
        return HttpClientBuilder.create().build();
    }

开发环境：Maven3.3.9

   IDEA2016.2.1

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by 清水66 on 2017/8/28.
 */
public class JsonGet {
    public static void main(String[] args){
        //创建HttpClientBuilder
        HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
        //HttpClient
        CloseableHttpClient closeableHttpClient = httpClientBuilder.build();
        HttpGet httpGet = new HttpGet("http://android.myapp.com/myapp/app/comment.htm?apkName=com.youcash.ZYWallet&apkCode=157&p=1&fresh=0.02709822286851704&contextData=");
        System.out.println(httpGet.getRequestLine());
        try {
            //执行get请求
            HttpResponse httpResponse = closeableHttpClient.execute(httpGet);
            //获取响应消息实体
            HttpEntity entity = httpResponse.getEntity();
            //响应状态
            System.out.println("status:" + httpResponse.getStatusLine());
            //判断响应实体是否为空
            if (entity != null) {
                System.out.println("contentEncoding:" + entity.getContentEncoding());
                parseJsonGet(EntityUtils.toString(entity));
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {                //关闭流并释放资源
                closeableHttpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    //解析Json数据
    public static void parseJsonGet(String jsonString){
        JSONObject jsonObject = JSONObject.fromObject(jsonString);
        //AppCommentsData类，存放评论的作者、评论内容等
        List list = new ArrayList();
        JSONObject obj= jsonObject.getJSONObject("obj");
        //商品评论信息
        JSONArray jsonArray = obj.getJSONArray("commentDetails");
        for(int i =0;i
            AppCommentsData appCommentsData = new AppCommentsData();
            appCommentsData.setApp_id(1);
            appCommentsData.setStore_id(1011);
            //评论作者
            appCommentsData.setAuthor(jsonArray.getJSONObject(i).getString("nickName"));
            //商品评论内容
            appCommentsData.setData(jsonArray.getJSONObject(i).getString("content"));
            //评分
            appCommentsData.setScore(jsonArray.getJSONObject(i).getInt("score"));
            list.add(appCommentsData);
        }
        System.out.println("输出appCommentsData//");
        for (int i=0;i
            AppCommentsData appCommentsData = list.get(i);
            System.out.println("name: ="+appCommentsData.getAuthor());
            System.out.println("content: ="+appCommentsData.getData());
            System.out.println("score: ="+appCommentsData.getScore());
        }
    }
}

类AppCommentsData如下：

/**
 * Created by 清水66 on 2017/8/22.
 */
public class AppCommentsData {
    int id;
    int app_id;//app的id
    int store_id;//应用商店id
    String author;//评论人
    int score;//评分
    String  data;//评论内容
    //生成getter.setter方法
}

注意;1)在获取评论内容时，并把评论内容插入MySQL数据库时，由于评论内容有表情符号会报 Incorrect string value: '\xF0\x9F\x98\xAD",...'  错误，

2）网络上建议把UTF-8改为utf8mb4，但是尝试了几个帖子上的操作没有成功，

        3）本人把评论内容的表情去掉插入数据库中了

String content = jsonArray.getJSONObject(i).getString("content").replaceAll("[\\x{10000}-\\x{10FFFF}]", "");
            appCommentsData.setData(content);