一文告诉你如何使用java调用http接口

程序如下：

添加apache相关maven依赖：

       <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.7</version>
        </dependency>    

POST请求如下：

import com.alibaba.fastjson.JSONObject;
import org.apache.http.HttpEntity;
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.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicHeader;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.List;

/**
 * HttpClient发送POST请求
 */
public class HttpClientService {


    /**
     * 发送POST请求
     * @param url
     * @param map集合
     * @return JSON
     * @throws Exception
     */
    public static Object sendPost(String url,  Map<String, String> map) throws Exception{
        JSONObject jsonObject = null;
        CloseableHttpClient client = null;
        CloseableHttpResponse response = null;
        try{
            /**
             * 创建一个httpclient对象
             */
            client = HttpClients.createDefault();
            /**
             * 创建一个post对象
             */
            HttpPost post = new HttpPost(url);

            JSONObject jsonParam = new JSONObject();
            Set<String> set = map.keySet();
            for (String str : set) {//将Map转换成JSONObject
                jsonParam.put(str, map.get(str));
            }
            JSONArray jsonArray = new JSONArray();
            jsonArray.add(jsonParam);//将JSONObject转换成JSONArray入参

            /**
             * 设置上传byte[]数组文件流
            builder.addBinaryBody("data", byteOutStream.toByteArray(), ContentType.MULTIPART_FORM_DATA, "AudioFile.wav");
            HttpEntity entity = builder.build();
            */

            /**
             * 设置上传单一对象
             */
            StringEntity entity = new StringEntity(jsonArray.toString(), "utf-8");

            /**
             * 设置请求的内容
             */
            post.setEntity(entity);
            /**
             * 设置请求的报文头部的编码
             */
            post.setHeader(new BasicHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8"));
            /**
             * 设置请求的报文头部的编码
             */
            post.setHeader(new BasicHeader("Accept", "text/plain;charset=utf-8"));
            /**
             * 执行post请求
             */
            response = client.execute(post);
            /**
             * 获取响应码
             */
            int statusCode = response.getStatusLine().getStatusCode();
            if (200 == statusCode){
                /**
                 * 通过EntityUitls获取返回内容
                 */
                String result = EntityUtils.toString(response.getEntity(),"UTF-8");
                /**
                 * 转换成json,根据合法性返回json或者字符串
                 */
                try{
                    jsonObject = JSONObject.parseObject(result);
                    return jsonObject;
                }catch (Exception e){
                    return result;
                }
            }else{
                LOGGER.error("HttpClientService-line: {}, errorMsg：{}", 146, "POST请求失败！");
            }
        }catch (Exception e){
            LOGGER.error("HttpClientService-line: {}, Exception：{}", 149, e);
        }finally {
            response.close();
            client.close();
        }
        return null;
    }

}

GET请求如下：

import com.alibaba.fastjson.JSONObject;
import org.apache.http.HttpEntity;
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.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicHeader;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.List;

/**
 * HttpClient发送GET请求
 */
public class HttpClientService {


    /**
     * 发送GET请求
     * @param url请求url
     * @param name请求参数
     * @return JSON
     * @throws Exception
     */
    public static Object sendGet(String url,String name) throws Exception{
        JSONObject jsonObject = null;
        CloseableHttpClient client = null;
        CloseableHttpResponse response = null;
        try{
            /**
             * 创建HttpClient对象
             */
            client = HttpClients.createDefault();
            /**
             * 创建URIBuilder
             */
            URIBuilder uriBuilder = new URIBuilder(url);
            
            /**
             * 设置参数
             */
            uriBuilder.addParameters(name);
            /**
             * 创建HttpGet
             */
            HttpGet httpGet = new HttpGet(uriBuilder.build());
            /**
             * 设置请求头部编码
             */
            httpGet.setHeader(new BasicHeader("Content-Type", "application/x-www-form-urlencoded; charset=utf-8"));
            /**
             * 请求服务
             */
            response = client.execute(httpGet);
            /**
             * 获取响应吗
             */
            int statusCode = response.getStatusLine().getStatusCode();

            if (200 == statusCode){
                /**
                 * 获取返回对象
                 */
                HttpEntity entity = response.getEntity();
                /**
                 * 通过EntityUitls获取返回内容
                 */
                String result = EntityUtils.toString(entity,"UTF-8");
                /**
                 * 转换成json,根据合法性返回json或者字符串
                 */
                try{
                    jsonObject = JSONObject.parseObject(result);
                    return jsonObject;
                }catch (Exception e){
                    return result;
                }
            }else{
                LOGGER.error("HttpClientService-line: {}, errorMsg{}", 97, "GET请求失败！");
            }
        }catch (Exception e){
            LOGGER.error("HttpClientService-line: {}, Exception: {}", 100, e);
        } finally {
            response.close();
            client.close();
        }
        return null;
    }
   
}

文章参考：

参考链接一、参考链接二、参考链接三、

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