HttpBodyServlet - request

requestBodyString

package hello.servlet.basic.request;

import org.springframework.util.StreamUtils;

import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

@WebServlet(name = "requestBodyStringService", urlPatterns = "/request-body-string")
public class RequestBodyStrongServlet extends HttpServlet {

    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        ServletInputStream inputStream = req.getInputStream();
        String messageBody = StreamUtils.copyToString(inputStream, StandardCharsets.UTF_8);//byte to string 시 인코딩 형식 지정 필요

        System.out.println("message body = " + messageBody);

        resp.getWriter().write("clear");
    }
}

Test를 위한 HelloData 생성

package hello.servlet.basic;

import lombok.Getter;
import lombok.Setter;

@Getter @Setter
public class HelloData {

    private String username;
    private int age;
}

httpBodyJsonServlet

package hello.servlet.basic.request;

import com.fasterxml.jackson.databind.ObjectMapper;
import hello.servlet.basic.HelloData;
import org.springframework.util.StreamUtils;

import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.http.HttpClient;
import java.nio.charset.StandardCharsets;

@WebServlet(name = "requestBodyJsonServlet", urlPatterns = "/request-body-json")
public class RequestBodyJsonServlet extends HttpServlet {
    //jackson 스프링 기본 json 라이브러리
    private ObjectMapper objectMapper = new ObjectMapper();

    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        ServletInputStream inputStream = req.getInputStream();
        String messageBody = StreamUtils.copyToString(inputStream, StandardCharsets.UTF_8);

        System.out.println("message body = " + messageBody);

        resp.getWriter().write("text clear\n");

        HelloData helloData = objectMapper.readValue(messageBody, HelloData.class);

        System.out.println("HelloData.Username = " + helloData.getUsername());
        System.out.println("HelloData.Age = " + helloData.getAge());

        resp.getWriter().write("Json clear");
    }
}