系统之间通讯HttpClient

柔情只为你懂 2022-02-28 10:44 193阅读 0赞

# 前言 #

系统之间的通讯方式有很多，其中HttpClient,通俗的理解HttpClient就是模仿浏览器发送请求的工具类。

# 使用 #

**maven引入依赖**

<dependency>
                    <groupId>org.apache.httpcomponents</groupId>
                    <artifactId>httpclient</artifactId>
                    <version>4.3.5</version>
                </dependency>

**封装好的工具类**

package com.taotao.common.util;
    
    import org.apache.http.NameValuePair;
    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.client.utils.URIBuilder;
    import org.apache.http.impl.client.CloseableHttpClient;
    import org.apache.http.impl.client.HttpClients;
    import org.apache.http.message.BasicNameValuePair;
    import org.apache.http.util.EntityUtils;
    
    import java.io.IOException;
    import java.net.URI;
    import java.util.ArrayList;
    import java.util.List;
    import java.util.Map;
    
    /**
     * @author lf
     * @Title: HttpClientUtil
     * @Description: TODO
     * @date 2019/3/25 15:51
     */
    public class HttpClientUtil {
    
        /**
         * 　　* @Description: GET请求 带参数
         * 　　* @param url 请求url
         * 　　* @param param 请求参数
         * 　　* @return ${return_type}
         * 　　* @author lf
         * 　　* @date 2019/3/25 15:54
         *
         */
        public static String doGet(String url, Map<String, String> param) {
    
            // 创建Httpclient对象
            CloseableHttpClient httpclient = HttpClients.createDefault();
    
            String resultString = "";
            CloseableHttpResponse response = null;
            try {
                // 创建uri
                URIBuilder builder = new URIBuilder(url);
                if (param != null) {
                    for (String key : param.keySet()) {
                        builder.addParameter(key, param.get(key));
                    }
                }
                URI uri = builder.build();
    
                // 创建http GET请求
                HttpGet httpGet = new HttpGet(uri);
    
                // 执行请求
                response = httpclient.execute(httpGet);
                // 判断返回状态是否为200
                if (response.getStatusLine().getStatusCode() == 200) {
                    resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
                }
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                try {
                    if (response != null) {
                        response.close();
                    }
                    httpclient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return resultString;
        }
    
        /**
         * 　　* @Description: GET请求 不带参数
         * 　　* @param url 请求url
         * 　　* @return ${return_type}
         * 　　* @author lf
         * 　　* @date 2019/3/25 15:54
         *
         */
        public static String doGet(String url) {
            return doGet(url, null);
        }
    
        /**
         * 　　* @Description: POST请求 带参数
         * 　　* @param url 请求url
         * 　　* @param param 请求参数
         * 　　* @return ${return_type}
         * 　　* @author lf
         * 　　* @date 2019/3/25 15:54
         *
         */
        public static String doPost(String url, Map<String, String> param) {
            // 创建Httpclient对象
            CloseableHttpClient httpClient = HttpClients.createDefault();
            CloseableHttpResponse response = null;
            String resultString = "";
            try {
                // 创建Http Post请求
                HttpPost httpPost = new HttpPost(url);
                // 创建参数列表
                if (param != null) {
                    List<NameValuePair> paramList = new ArrayList<>();
                    for (String key : param.keySet()) {
                        paramList.add(new BasicNameValuePair(key, param.get(key)));
                    }
                    // 模拟表单
                    UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList);
                    httpPost.setEntity(entity);
                }
                // 执行http请求
                response = httpClient.execute(httpPost);
                resultString = EntityUtils.toString(response.getEntity(), "utf-8");
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                try {
                    response.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
    
            return resultString;
        }
    
        /**
         * 　　* @Description: POST请求 不带参数
         * 　　* @param url 请求url
         * 　　* @return ${return_type}
         * 　　* @author lf
         * 　　* @date 2019/3/25 15:54
         *
         */
        public static String doPost(String url) {
            return doPost(url, null);
        }
    }