자바 전송 get 및 post 요청 도구 방법

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class HttpRequest {
    /**
     *    URL  GET     
     * 
     * @param url
     *                 URL
     * @param param
     *                ，        name1=value1&name2=value2    。
     * @return URL             
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            //    URL     
            URLConnection connection = realUrl.openConnection();
            //          
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            //        
            connection.connect();
            //          
            Map<String, List<String>> map = connection.getHeaderFields();
            //           
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            //    BufferedReader      URL   
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("  GET      ！" + e);
            e.printStackTrace();
        }
        //   finally       
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

    /**
     *     URL   POST     
     * 
     * @param url
     *                  URL
     * @param param
     *                ，        name1=value1&name2=value2    。
     * @return             
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            //    URL     
            URLConnection conn = realUrl.openConnection();
            //          
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            //   POST          
            conn.setDoOutput(true);
            conn.setDoInput(true);
            //   URLConnection        
            out = new PrintWriter(conn.getOutputStream());
            //       
            out.print(param);
            // flush      
            out.flush();
            //   BufferedReader      URL   
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("   POST       ！"+e);
            e.printStackTrace();
        }
        //  finally       、   
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }    
}

사용 방법:

  public static void main(String[] args) {
        //   GET   
        String s=HttpRequest.sendGet("http://localhost:6144/Home/RequestString", "key=123&v=456");
        System.out.println(s);
        
        //   POST   
        String sr=HttpRequest.sendPost("http://localhost:6144/Home/RequestPostString", "key=123&v=456");
        System.out.println(sr);
    }