JAVA 请求api接口 post方式 json参数 通用工具

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
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.HttpClients;
import org.apache.http.message.BasicHeader;
import org.apache.http.protocol.HTTP;


import java.io.*;
import java.net.MalformedURLException;
import java.net.URL;

/** http请求工具 */
public class HttpUtil { 
   
     
    
    /** * 发送post请求 * @param json * @param URL * @return */
    public static String sendPost(JSONObject json,String URL) { 
   
        CloseableHttpClient client = HttpClients.createDefault();
        HttpPost post = new HttpPost(URL);
        post.setHeader("Content-Type", "application/json");
        post.addHeader("Authorization", "Basic YWRtaW46");
        String result;
        try { 
   
            StringEntity s = new StringEntity(json.toString(), "utf-8");
            s.setContentType(new BasicHeader(HTTP.CONTENT_TYPE,
                    "application/json"));
            post.setEntity(s);
            // 发送请求
            HttpResponse httpResponse = client.execute(post);
            // 获取响应输入流
            InputStream inStream = httpResponse.getEntity().getContent();
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    inStream, "utf-8"));
            StringBuilder strber = new StringBuilder();
            String line;
            while ((line = reader.readLine()) != null)
                strber.append(line + "\n");
            inStream.close();
            result = strber.toString();
            if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) { 
   
                System.out.println("请求服务器成功，做相应处理");
            } else { 
   
                System.out.println("请求服务端失败");
            }
        } catch (Exception e) { 
   
          
            throw new RuntimeException(e);
        }
        return result;
    }

    /**
     * 下载网络图片
     * @param urlList  网络路径
     * @param path  保存路径
     */
    public static void downloadPicture(String urlList,String path) {
        URL url = null;
        try {
            url = new URL(urlList);
            DataInputStream dataInputStream = new DataInputStream(url.openStream());

            FileOutputStream fileOutputStream = new FileOutputStream(new File(path));
            ByteArrayOutputStream output = new ByteArrayOutputStream();

            byte[] buffer = new byte[1024];
            int length;

            while ((length = dataInputStream.read(buffer)) > 0) {
                output.write(buffer, 0, length);
            }
            fileOutputStream.write(output.toByteArray());
            dataInputStream.close();
            fileOutputStream.close();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

 上图代码中一个请求的http的方法，另一个方法为下载网络图片

以上需要用到的依赖pom如下

    com.alibaba
    fastjson
    1.2.83



    org.apache.httpcomponents
    httpclient
    4.5.12