Java 基于原生HttpURLConnection ，调用GET 和 POST请求工具类

左手的ㄟ右手 2022-12-03 01:53 99阅读 0赞

用的是java自带的HttpURLConnection，可以脱离框架使用（除了post请求传json时用了一下json的序列化相关的jar）。

工具类代码：

import com.alibaba.fastjson.JSON;
    import java.io.*;
    import java.net.HttpURLConnection;
    import java.net.URL;
    import java.util.HashMap;
    import java.util.Map;
    
    
    
    /**
     * @Author : JCccc
     * @CreateTime : 2019/5/11
     * @Description :
     **/
    public class HttpURLConnectionUtil {
    
    
        /**
         * get请求
         *
         * @param path
         * @param param
         * @return
         */
        public static String get(String path,Map<String, Object> param) {
            try {
                if (param != null) {
                    StringBuffer paramBuffer = new StringBuffer();
                    int i = 0;
                    for (String key : param.keySet()) {
                        if (i == 0)
                            paramBuffer.append("?");
                        else
                            paramBuffer.append("&");
                        paramBuffer.append(key).append("=").append(param.get(key));
                        i++;
                    }
                    path += paramBuffer;
                }
                URL url = new URL(path);    // 把字符串转换为URL请求地址
                HttpURLConnection connection = (HttpURLConnection) url.openConnection();// 打开连接
                connection.connect();// 连接会话
                // 获取输入流
                BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                String line;
                StringBuilder sb = new StringBuilder();
                while ((line = br.readLine()) != null) {// 循环读取流
                    sb.append(line);
                }
                br.close();// 关闭流
                connection.disconnect();// 断开连接
                return sb.toString();
            } catch (Exception e) {
                e.printStackTrace();
                System.out.println("失败!");
                return null;
            }
        }
        /**
         * post    请求
         *
         * @param path
         * @param jsonStr
         * @return
         */
        public static String post(String path,String jsonStr) {
    
            try {
                URL url =  new URL(path);
                HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
                httpURLConnection.setRequestMethod("POST");// 提交模式
                httpURLConnection.setConnectTimeout(10000);//连接超时 单位毫秒
                httpURLConnection.setReadTimeout(10000);//读取超时 单位毫秒
                // 发送POST请求必须设置如下两行
                httpURLConnection.setDoOutput(true);
                httpURLConnection.setDoInput(true);
                httpURLConnection.setRequestProperty("Charset", "UTF-8");
                httpURLConnection.setRequestProperty("Content-Type", "application/json");
    
    //			PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
    //			printWriter.write(postContent);
    //			printWriter.flush();
    
                httpURLConnection.connect();
                OutputStream os=httpURLConnection.getOutputStream();
                os.write(jsonStr.getBytes("UTF-8"));
                os.flush();
    
                StringBuilder sb = new StringBuilder();
                int httpRspCode = httpURLConnection.getResponseCode();
                if (httpRspCode == HttpURLConnection.HTTP_OK) {
                    // 开始获取数据
                    BufferedReader br = new BufferedReader(
                            new InputStreamReader(httpURLConnection.getInputStream(), "utf-8"));
                    String line = null;
                    while ((line = br.readLine()) != null) {
                        sb.append(line);
                    }
                    br.close();
                    return sb.toString();
    
                }
    
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }
    
        public static void main(String[] args) {
    
            Map<String,Object> map=new HashMap<>();
            map.put("A","a");
            map.put("B",100);
            String getResult = get("http://192.xxx.xx.xx:8665/testGet", map);
            System.out.println(getResult);
    
            String postResult = post("http://192.xxx.xx.xx:8665/testPost", JSON.toJSONString(map));
            System.out.println(postResult);
    
    
        }
    }