① 리턴 X 입력 X
packagekr.or.ksmart class AA01
package kr.or.ksmart;
public class AA01 {
public void aaa() {
System.out.println("01 aaa 실행");
}
}
aa01_call.jsp
<%@page import="com.sun.xml.internal.bind.v2.schemagen.xmlschema.Import"%>
<%@ page language="java" contentType="text/html; charset=EUC-KR"
pageEncoding="EUC-KR"%>
<%@page import="kr.or.ksmart.AA01"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
AA01 a = new AA01();
a.aaa();
%>aa01_call.jsp 실행
<console>
01 aaa 실행
② 리턴 X 입력 O
package kr.or.ksmart class BB01
package kr.or.ksmart;
public class BB01 {
public void sum(int one, int two) {
System.out.println("one 변수에 담긴 값 : "+one);
System.out.println("two 변수에 담긴 값 : "+two);
int hap = one + two;
System.out.println(hap + "<- hap");
}
}
bb01_call.jsp
<%@page import="kr.or.ksmart.BB01"%>
<%@ page language="java" contentType="text/html; charset=EUC-KR"
pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
BB01 b = new BB01();
b.sum(5, 3);
%>bb01_call.jsp 실행
<console>
one 변수에 담긴 값 : 5
two 변수에 담긴 값 : 3
8<- hap
③ 리턴 O 입력 X
package kr.or.ksmart class CC01
package kr.or.ksmart;
public class CC01 {
public String cc() {
System.out.println("cc메서드 실행");
return "김또깡";
}
}cc01_call.jsp
<%@ page language="java" contentType="text/html; charset=EUC-KR"
pageEncoding="EUC-KR"%>
<%@ page import = "kr.or.ksmart.CC01" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
CC01 c =new CC01();
String re = c.cc();
out.println(re + "<--re <br/><br/><br/>");
%>cc01_call.jsp 실행
<console>
cc메서드 실행
<브라우저>
김또깡<--re
④ 리턴 O 입력 O
package kr.or.ksmart class DD01
package kr.or.ksmart;
public class DD01 {
public int sum(int one, int two) {
System.out.println("one 변수에 담긴 값 : "+one);
System.out.println("two 변수에 담긴 값 : "+two);
int hap = one + two;
System.out.println(hap + "<- hap");
return hap;
}
}dd01_call.jsp
<%@page import="kr.or.ksmart.DD01"%>
<%@ page language="java" contentType="text/html; charset=EUC-KR"
pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
DD01 d = new DD01();
int result = d.sum(5, 15);
out.println(result + "<- result <br/><br/><br/>");
%>dd01_call.jsp 실행
<console>
one 변수에 담긴 값 : 5
two 변수에 담긴 값 : 15
20<- hap
<브라우저>
20<- result
실습하기
form으로 입력받은 String data type의 두 수를 int data type으로 변환하여
package kr.or.ksmart class DD01 method sum 을 이용해 합산하여 화면에 출력하기
package kr.or.ksmart class DD01 (위의 ④에서 생성함.)
package kr.or.ksmart;
public class DD01 {
public int sum(int one, int two) {
System.out.println("one 변수에 담긴 값 : "+one);
System.out.println("two 변수에 담긴 값 : "+two);
int hap = one + two;
System.out.println(hap + "<- hap");
return hap;
}
}
input_form.jsp >> 두 수를 입력받을 form 생성
<%@ page language="java" contentType="text/html; charset=EUC-KR"
pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=EUC-KR">
<title>Insert title here</title>
</head>
<body>
<form action="<%=request.getContextPath()%>/cal/sum_call.jsp" method="post">
1 : <input type = "text" name = "one"> <br/>
2 : <input type = "text" name = "two"> <br/>
<input type ="submit" value = "전송">
</form>
</body>
</html>
sum_call.jsp >> form으로 입력받은 String data type의 두 수를 int data type으로 변환 ( Integer.parseInt() )
kr.or.ksmart.DD01 import 후
method sum 호출
<%@page import="kr.or.ksmart.DD01"%>
<%@ page language="java" contentType="text/html; charset=EUC-KR"
pageEncoding="EUC-KR"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%
String one = request.getParameter("one");
String two = request.getParameter("two");
int a = Integer.parseInt(one);
int b = Integer.parseInt(two);
DD01 dd = new DD01();
dd.sum(a,b);
out.println("입력한 수 1 : " + a + "<br/>");
out.println("입력한 수 2 : " + b + "<br/><br/>");
out.println("두 수의 합 : " + dd.sum(a,b));
%>input_form.jsp 실행
<브라우저 - 입력화면>
<console>
one 변수에 담긴 값 : 1234
two 변수에 담긴 값 : 4321
5555<- hap
<브라우저 - 결과화면>
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