Json 보내고 응답 받기

Remark : 웹서버에 Json 보내고 Json으로 받아서 PrettyPrint 로 저장해보자.


package com.example.demo;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

import java.io.*;
import java.io.IOException;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) throws IOException {
        SpringApplication.run(DemoApplication.class, args);

        String host_url = "http://dev.our.com:8099/dev/Far/v1.00";
        HttpURLConnection conn = null;

        try {
            JSONObject RetVal = Res.RqModel(); //만든 Json 리턴 함수 

            URL url = new URL(host_url);
            conn = (HttpURLConnection) url.openConnection();

            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Type", "application/json");

            conn.setDoOutput(true);
            BufferedWriter bw = new BufferedWriter((new OutputStreamWriter(conn.getOutputStream())));

            bw.write(RetVal.toString()); //data
            bw.flush();
            bw.close();

            BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String returnMsg = in.readLine();

            //JSONParser parser = new JSONParser();
            //JSONObject jsonObject = (JSONObject) parser.parse(returnMsg);

            //ModelVo modelVo = new Gson().fromJson(returnMsg, ModelVo .class);

            // PrettyPrint
            Gson gson = new GsonBuilder().setPrettyPrinting().create();
            JsonElement je = JsonParser.parseString(returnMsg);
            String prettyJsonString = gson.toJson(je);

            try (PrintWriter out = new PrintWriter("Res.json")) {
                out.println(prettyJsonString);
            }

            //System.out.println("응답메시지:" + returnMsg);

            int responseCode = conn.getResponseCode();
            if (responseCode == 400) {
                System.out.println("400:명령 실행 오류");
            } else if (responseCode == 500) {
                System.out.println(responseCode + " : 응답코드임");
            }

        } catch (FileNotFoundException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new RuntimeException(e);
        //} catch (ParseException e) {
        //    throw new RuntimeException(e);
        }
    }

}

package com.example.demo;

import com.google.gson.Gson;

import com.google.gson.GsonBuilder;

import com.google.gson.JsonElement;

import com.google.gson.JsonParser;

import org.json.simple.JSONObject;

import org.json.simple.parser.JSONParser;

import org.json.simple.parser.ParseException;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import java.io.*;

import java.io.IOException;

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;

@SpringBootApplication

public class DemoApplication {

public static void main(String[] args) throws IOException {

SpringApplication.run(DemoApplication.class, args);

String host_url = "http://dev.our.com:8099/dev/Far/v1.00";

HttpURLConnection conn = null;

try {

JSONObject RetVal = Res.RqModel(); //만든 Json 리턴 함수

URL url = new URL(host_url);

conn = (HttpURLConnection) url.openConnection();

conn.setRequestMethod("POST");

conn.setRequestProperty("Content-Type", "application/json");

conn.setDoOutput(true);

BufferedWriter bw = new BufferedWriter((new OutputStreamWriter(conn.getOutputStream())));

bw.write(RetVal.toString()); //data

bw.flush();

bw.close();

BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));

String returnMsg = in.readLine();

//JSONParser parser = new JSONParser();

//JSONObject jsonObject = (JSONObject) parser.parse(returnMsg);

//ModelVo modelVo = new Gson().fromJson(returnMsg, ModelVo .class);

// PrettyPrint

Gson gson = new GsonBuilder().setPrettyPrinting().create();

JsonElement je = JsonParser.parseString(returnMsg);

String prettyJsonString = gson.toJson(je);

try (PrintWriter out = new PrintWriter("Res.json")) {

out.println(prettyJsonString);

}

//System.out.println("응답메시지:" + returnMsg);

int responseCode = conn.getResponseCode();

if (responseCode == 400) {

System.out.println("400:명령 실행 오류");

} else if (responseCode == 500) {

System.out.println(responseCode + " : 응답코드임");

}

} catch (FileNotFoundException e) {

throw new RuntimeException(e);

} catch (IOException e) {

throw new RuntimeException(e);

//} catch (ParseException e) {

// throw new RuntimeException(e);

}