Servlet 응답 처리
2024. 8. 27. 16:23ㆍJAVA 기반 웹개발/SERVLET & JSP
ServletResponse 기본 사용법
- 기본적으로 response 헤더 설정 : setHeader("[field Name]", "[value]")
- Response 상태 코드 : setStatus("[HTTP 정의 상수]")
- Headet 편의 메서드 : ContentType, Cookie, Redirect
@WebServlet(urlPatterns="/main")
public class ResponseTest extends HttpServlet{
@Override
protected void service( HttpServletRequest request, HttpServletResponse response) throws ServletExceptio, IOException
{
response.setStatus(HttpServletResponse.SC_OK); // 200 상태코드
response.setHeader("Content-Type", "text/plain; charset=utf-8");
response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate");
response.setHeader("Pragma", "no-cache");
[Content Type 설정 편의 메서드]
response.setContentType("text/plain");
response.setCharsetEncoding("utf-8");
//[쿠키 설정]
Cookie cookie = new Cookie("TestCookie", "good");
cookie.setMaxAge(600);
response.addCookie(cookie);
//[리다이렉트]
response.sendRedirect("/main/redirect/page");
PrintWriter writer = response.getWriter();
writer.println("ok");
}
}
Response 텍스트 / HTML
- PrintWriter 객체를 이용해서 응답 (텍스트 , html)
- response.getWriter()을 이용하여 반환
@WebServlet(urlPatterns="/main")
public class ResponseTest extends HttpServlet{
@Override
protected void service( HttpServletRequest request, HttpServletResponse response) throws ServletExceptio, IOException
{
response.setStatus(HttpServletResponse.SC_OK); // 200 상태코드
response.setHeader("Content-Type", "text/plain; charset=utf-8");
response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate");
response.setHeader("Pragma", "no-cache");
PrintWriter writer = response.getWriter();
//단순 텍스트
writer.println("ok");
//html 반환
writer.println("<html>");
writer.println("<body>");
writer.println("<p> Test </p>");
writer.println("</body>");
writer.println("</html>");
}
}
HTTP API JSON
public class TestObject{
private String username;
private int count;
void setUsername(String username)
{
this.username = username;
}
void setCount(int count)
{
this.count = count;
}
String getUsername()
{
return this.username;
}
int getCount()
{
return this.count;
}
}
@WebServlet(urlPatterns="/main")
public class TestResponse extends HttpServlet{
private ObjectMapper objecvtMapper = new ObjectMapper();
@Override
protected void service(HttpServletREquest request, HttpServletResponse response) throws ServletException, IOException{
//application/json 은 utf-8을 사용하도록 정의되있다 ( 굳이 추가하지 않아도 됨 )
response.setHeader("content-type", "application/json");
response.setCharacterEncoding("utf-8");
TestObject data = new TestObject();
data.setUsername("test");
data.setCount(20);
String result = objectMapper.writeValueAsString(data);
response.getWriter().wirte(result);
}
}
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