简介

依赖
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.6</version>
</dependency>

api

发送get请求: doGet(String url);
发送post请求，传参数json: doPostJson(String url, String jsonParam);

源码

import java.util.HashMap;
import java.util.Map;import org.apache.http.HttpEntity;
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.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;import com.alibaba.fastjson.JSON;/* 依赖
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.6</version>
</dependency>
*/
public class HttpClientUtils {public static void main(String[] args) {doGet("http://127.0.0.1/test1");Map<String, Object> data = new HashMap<String, Object>();data.put("code", "002");data.put("name", "测试");doPostJson("http://127.0.0.1/test2", Object2String(data));}public static void doPostJson(String url, String jsonParam){try {CloseableHttpClient client = null;CloseableHttpResponse response = null;try {HttpPost httpPost = new HttpPost(url);httpPost.setHeader(HTTP.CONTENT_TYPE, "application/json");httpPost.setEntity(new StringEntity(jsonParam, ContentType.create("text/json", "UTF-8")));client = HttpClients.createDefault();response = client.execute(httpPost);int code = response.getStatusLine().getStatusCode();HttpEntity entity = response.getEntity();String result = EntityUtils.toString(entity);System.err.println(code);System.err.println(result);} finally {if (response != null) {response.close();}if (client != null) {client.close();}}} catch (Exception e) {e.printStackTrace();}}public static void doGet(String url){try {CloseableHttpClient client = null;CloseableHttpResponse response = null;try {HttpGet httpGet = new HttpGet(url);client = HttpClients.createDefault();response = client.execute(httpGet);HttpEntity entity = response.getEntity();String result = EntityUtils.toString(entity);int code = response.getStatusLine().getStatusCode();System.err.println(result);System.err.println(code);} finally {if (response != null) {response.close();}if (client != null) {client.close();}}} catch (Exception e) {e.printStackTrace();}}/** 将输入参数  转换为json字符串 */public static String Object2String(Object obj){
//      try {
//          return new ObjectMapper().writeValueAsString(obj);
//      } catch (JsonProcessingException e) {
//          e.printStackTrace();
//      }return JSON.toJSONString(obj);}//TODO 待解决： 服务端接收后有中文款乱码问题
//  public static void doPostForm(String url, String formParam){
//        try {
//            CloseableHttpClient client = null;
//            CloseableHttpResponse response = null;
//            try {
//                // 创建一个提交数据的容器
//                List<BasicNameValuePair> parames = new ArrayList<>();
//                parames.add(new BasicNameValuePair("userId", "001"));
//                parames.add(new BasicNameValuePair("userName", "测试"));
//
//                HttpPost httpPost = new HttpPost(url);
//                httpPost.setHeader(HTTP.CONTENT_TYPE, "application/x-www-form-urlencoded;charset=UTF-8");
//                httpPost.setEntity(new UrlEncodedFormEntity(parames, "UTF-8"));
//                client = HttpClients.createDefault();
//                response = client.execute(httpPost);
//                HttpEntity entity = response.getEntity();
//                String result = EntityUtils.toString(entity);
//                System.err.println(result);
//            } finally {
//                if (response != null) {
//                    response.close();
//                }
//                if (client != null) {
//                    client.close();
//                }
//            }
//        } catch (Exception e) {
//            e.printStackTrace();
//        }
//  }
}

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HttpClient工具类 HttpClientUtils.java

简介

api

源码

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