java接口如何调用（附代码）

package com.lwl.api.provider.demo.test;
 
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.HttpURLConnection;
import java.net.URL;
 
public class RestUtil {
    public String load(String url,String query) throws Exception
    {
        URL restURL = new URL(url);
        /*
         * 此处的urlConnection对象实际上是根据URL的请求协议(此处是http)生成的URLConnection类 的子类HttpURLConnection
         */
        HttpURLConnection conn = (HttpURLConnection) restURL.openConnection();
        //请求方式
        conn.setRequestMethod("POST");
        //设置是否从httpUrlConnection读入，默认情况下是true; httpUrlConnection.setDoInput(true);
        conn.setDoOutput(true);
        //allowUserInteraction 如果为 true，则在允许用户交互（例如弹出一个验证对话框）的上下文中对此 URL 进行检查。
        conn.setAllowUserInteraction(false);
        PrintStream ps = new PrintStream(conn.getOutputStream());
        ps.print(query);
        ps.close();
        BufferedReader bReader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        String line,resultStr="";
        while(null != (line=bReader.readLine()))
        {
            resultStr +=line;
        }
        System.out.println("接口调用数据："+resultStr);
        bReader.close();
        return resultStr;
    }
    public static void main(String []args) {try {
        RestUtil restUtil = new RestUtil();
        String resultString = restUtil.load(
                "http://192.168.10.89:8080/eoffice-restful/resources/sys/oaholiday",
                "floor=first&year=2017&month=9&isLeader=N");
    } catch (Exception e) {
        System.out.print(e.getMessage());
    }
    }
}