使用HttpClient调用第三方接口

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使用HttpClient调用第三方接口

1.引入Jar包

httpclient-4.5.jar
httpcore-4.4.1.jar

2.所需HttpClientUtil工具类

代码如下：

package com.kd.nm.util;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URI;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import com.alibaba.fastjson.JSONObject;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author 小辰哥哥
 *
 * 调用第三方服务
 * HttpClient工具类
 */
public class HttpClientUtil {
     

  // 日志打印
  private static final Logger LOGGER = LoggerFactory.getLogger(HttpClientUtil.class);

  /**
   * get请求
   * @return
   */
  public static String doGet(String url) {
     
    try {
     
      HttpClient client = new DefaultHttpClient();
      //发送get请求
      HttpGet request = new HttpGet(url);
      HttpResponse response = client.execute(request);

      /**请求发送成功，并得到响应**/
      if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
     
        /**读取服务器返回过来的json字符串数据**/
        String strResult = EntityUtils.toString(response.getEntity());

        return strResult;
      }
    }
    catch (IOException e) {
     
      e.printStackTrace();
    }

    return null;
  }

  /**
   * post请求(用于key-value格式的参数)
   * @param url
   * @param params
   * @return
   */
  public static String doPost(String url, Map params){
     

    BufferedReader in = null;
    try {
     
      // 定义HttpClient
      HttpClient client = new DefaultHttpClient();
      // 实例化HTTP方法
      HttpPost request = new HttpPost();
      request.setURI(new URI(url));

      //设置参数
      List<NameValuePair> nvps = new ArrayList<NameValuePair>();
      for (Iterator iter = params.keySet().iterator(); iter.hasNext();) {
     
        String name = (String) iter.next();
        String value = String.valueOf(params.get(name));
        nvps.add(new BasicNameValuePair(name, value));

        LOGGER.debug("参数列表："+name +"-"+value);
      }
      request.setEntity(new UrlEncodedFormEntity(nvps,HTTP.UTF_8));

      HttpResponse response = client.execute(request);


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


      LOGGER.debug("当前的状态码："+code);
      if(code == 200){
         //请求成功
        in = new BufferedReader(new InputStreamReader(response.getEntity()
            .getContent(),"utf-8"));
        StringBuffer sb = new StringBuffer("");
        String line = "";
        String NL = System.getProperty("line.separator");
        while ((line = in.readLine()) != null) {
     
          sb.append(line + NL);
        }

        in.close();

        LOGGER.debug("sb："+sb.toString());
        return sb.toString();
      }
      else{
     
        LOGGER.debug("状态码：" + code);
        return null;
      }
    }
    catch(Exception e){
     
      e.printStackTrace();

      return null;
    }
  }

  /**
   * post请求（用于请求json格式的参数）
   * @param url
   * @param params
   * @return
   */
  public static String doPost(String url, String params) throws Exception {
     

    CloseableHttpClient httpclient = HttpClients.createDefault();
    HttpPost httpPost = new HttpPost(url);// 创建httpPost
    httpPost.setHeader("Accept", "application/json");
    httpPost.setHeader("Content-Type", "application/json");
    String charSet = "UTF-8";
    StringEntity entity = new StringEntity(params, charSet);
    httpPost.setEntity(entity);
    CloseableHttpResponse response = null;

    try {
     

      response = httpclient.execute(httpPost);
      StatusLine status = response.getStatusLine();
      int state = status.getStatusCode();
      if (state == HttpStatus.SC_OK) {
     
        HttpEntity responseEntity = response.getEntity();
        String jsonString = EntityUtils.toString(responseEntity);
        return jsonString;
      }
      else{
     
        LOGGER.error("请求返回:"+state+"("+url+")");
      }
    }
    finally {
     
      if (response != null) {
     
        try {
     
          response.close();
        } catch (IOException e) {
     
          e.printStackTrace();
        }
      }
      try {
     
        httpclient.close();
      } catch (IOException e) {
     
        e.printStackTrace();
      }
    }
    return null;
  }

}

3.后端控制器相关代码（Spring+SpringMVC+Mybatis）

代码如下：

/**
   * @author 小辰哥哥
   *
   * 调用第三方接口（利用httpClientUtil工具类）------人脸校验
   * @param imagebase64
   * @param userId
   * @param key
   * @return
   */
  @RequestMapping(value = "/faceCompare",method = RequestMethod.POST)
  @ResponseBody
  public String faceCompare(@RequestParam("imagebase64") String imagebase64,
                            @RequestParam("userId") String userId,
                            @RequestParam("key") String key){
     
    // 第三方服务接口路径
    String url = "http://ip:port/faceserver/afr/api/v1.0/verify";

    // 需要的参数存储在HashMap集合中
    Map<String,String> map = new HashMap<>();
    map.put("imagebase64",imagebase64);
    map.put("userId",userId);
    map.put("key",key);
    
    String resultCompare = HttpClientUtil.doPost(url, map);
    return resultCompare;
  }

4.前后端交互相关代码（Vue.js）

代码如下：

              var params=new URLSearchParams();
              params.append("imagebase64",img); 
          	  params.append("userId",this.UUID); 
              params.append("key","642b3652-f4e3-4a40-8c83-1e910e2b8a90"); 

              // 异步请求
              this.$axios({
                url: "/api/content/faceCompare",
                method: "POST",
                data: params
              }).then(data => {
                if(data.data.status == "success"){
                  // 成功
                  this.$message(data.data.content);
                }else if(data.data.status == "fail"){
                  // 失败
                  this.$message(data.data.content);
                }
              }).catch(error => {
                this.$message("网络请求错误！");
              })

总结

每天一个提升小技巧！！！

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