* Servlet
init() ===> service() ===> destroy()
초기화메서드 화면을 제공
- [MyServlet.java] : GenericServlet
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
package day2;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.GenericServlet;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebServlet;
@WebServlet("/myServlet.do")
public class MyServlet extends GenericServlet{
@Override
public void init() throws ServletException {
System.out.println("초기화 메서드 호출중");
}
@Override
public void destroy() {
System.out.println("서블릿 제거중");
}
@Override
public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException {
System.out.println("Service() 호출중");
req.setCharacterEncoding("UTF-8");
res.setCharacterEncoding("UTF-8");
PrintWriter out = res.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<meta charset='UTF-8'>");
out.println("</head>");
out.println("<body>");
out.println("<h1> Service() 호출중 </h1>");
out.println("</body>");
out.println("</html>");
}
}
|
cs |
>> 실행하고 tomcat중지
- [MyServlet2.java] : HttpServlet
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
package day2;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
// GenericServlet이 부모
// HttpServlet이 자식
@WebServlet("/myServlet2.do")
public class MyServlet2 extends HttpServlet{
@Override
public void init() throws ServletException {
System.out.println("init() 호출중");
}
@Override
public void destroy() {
System.out.println("destroy() 호출중");
}
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("Service() 호출중");
}
}
|
cs |
>> 실행하고 tomcat중지
- [Lotto.java] > m을 settergetter 추가 >> 계속 참고!!
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
package day2;
import java.util.Arrays;
public class Lotto {
int[] rnd;
int[] m;
// m에 setter, getter 추가
public int[] getM() {
return m;
}
public void setM(int[] m) {
this.m = m;
}
//생성자
public Lotto() {
rnd = new int[45];
m = new int[6];
init(); // init 메서드 생성(초기화 메서드)
shuffle(); // 1000번 섞기
set(); // 6개의 값을 배열에 담기
sort(); // 정렬
}
public void print() {
for(int i=0; i<m.length; i++) {
System.out.println(m[i]+"\t");
}
System.out.println();
}
private void sort() {
Arrays.sort(m);
}
private void set() {
for(int i=0; i<6; i++) {
m[i] = rnd[i];
}
}
private void shuffle() { // 1000번 동안 값을 섞어주는 메서드
for(int i = 0; i<=1000; i++) {
int a = (int)(Math.random()*45);
int b = (int)(Math.random()*45);
int temp = 0;
temp = rnd[b];
rnd[b] = rnd[a];
rnd[a] = temp;
}
}
private void init() { // 초기화 메서드
for(int i=0; i<rnd.length; i++) {
rnd[i] = i+1;
}
}
}
|
cs |
- [TestMain.java] : Lotto 실행 > 콘솔에 로또 배열 출력
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
package day2;
import java.util.Arrays;
public class TestMain {
public static void main(String[] args) {
Lotto l1 = new Lotto();
l1.print();
int[] lottoArray = l1.getM();
System.out.println(Arrays.toString(lottoArray));
}
}
|
cs |
- [BigChance.java] > 웹 창에 로또 공 이미지 출력(랜덤 배열에 따라)
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
package day2;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Arrays;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/day2/bigChance.do")
public class BigChance extends HttpServlet{
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doProcess(req, resp);
}
// doProcess를 extract method화
private void doProcess(HttpServletRequest req, HttpServletResponse resp) throws IOException {
req.setCharacterEncoding("UTF-8"); // 예외 처리(던지기)
resp.setContentType("text/html;charset=UTF-8");
PrintWriter out = resp.getWriter(); // 예외 던지기
out.println("<html>");
out.println("<head>");
out.println("<title> Hello 로또 </title>");
out.println("<script>");
out.println("window.onload = function(){");
out.println("alert('어때요 힘들죠')");
out.println("} ");
out.println("</script>");
out.println("</head>");
out.println("<body>");
out.println("<h1> 로또 </h1>");
// http://localhost:8080/web/day2/bigChance.do
// webapp/images/ball1.png
// localhost:8080/web/images/ball1.png
// 절대경로: out.println("<img src = 'http://localhost:8080/web/images/ball1.png' >");
// 상대경로: out.println("<img src = '../images/ball1.png' >");
Lotto lt = new Lotto();
int[] m = lt.getM();
System.out.println(Arrays.toString(m));
System.out.println("m[0] : " + m[0]);
for(int i=0; i<m.length; i++) {
out.println("<img src = '../images/ball"+m[i]+".png' >");
}
out.println("</body>");
out.println("</html>");
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doProcess(req, resp);
}
}
|
cs |
- [RandomPoster] : 화면에 랜덤 포스터 출력
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
package day2;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/day2/rndPoster.do")
public class RandomPoster extends HttpServlet{
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doProcess(req, resp);
}
private void doProcess(HttpServletRequest req, HttpServletResponse resp) throws IOException {
req.setCharacterEncoding("UTF-8");
resp.setContentType("text/html;charset=UTF-8");
PrintWriter out = resp.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title> 랜덤 포스터 </title>");
out.println("</head>");
out.println("<body>");
Lotto lt = new Lotto();
int[] m = lt.getM();
out.println("<img src ='../images/movie_image"+m[0]+".jpg' > ");
out.println("</body>");
out.println("</html>");
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doProcess(req, resp);
}
}
|
cs |
'web' 카테고리의 다른 글
| [jsp] jspService의 지역 변수 / forward&redirect / 로그인, 회원가입 페이지 만들기 (1) | 2023.04.30 |
|---|---|
| [JSP] 데이터베이스 파일(DEPT) 가져와서 출력<VO/DAO> (0) | 2023.04.30 |
| [jsp] <로그인 페이지 만들기(db 연결!)> : member 테이블 사용 + lombok 다운로드 (0) | 2023.04.30 |
| [jsp] jsp (jsp의 스크립트 요소/button/text/for문/request&response) (0) | 2023.04.23 |
| [web] Servlet (0) | 2023.04.23 |