JSP and Servlet
JSP(4) getRequestDispatcher
Jini0
2018. 8. 20. 11:59
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<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1">
<display-name>sample04</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>hello</servlet-name>
<servlet-class>sample04.HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>hello</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
</web-app>
===================================================================
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="hello" method="get">
<table>
<tr>
<td>이름</td>
<td>
<input type="text" size="20" name="name" value="">
</td>
</tr>
<tr>
<td>나이</td>
<td>
<input type="text" size="5" name="age">
</td>
</tr>
<tr>
<td>좋아하는 과일</td>
<td>
<select name="food" size="3" multiple="multiple">
<option value="apple">사과</option>
<option value="melon">멜론</option>
<option value="grape">포도</option>
</select>
</td>
</tr>
</table>
<input type="submit" value="전송">
</form>
</body>
</html>
==================================================================
package dto;
import java.util.Arrays;
public class Human {
private String name;
private int age;
private String arrFood[];
public Human() {
}
public Human(String name, int age, String[] arrFood) {
super();
this.name = name;
this.age = age;
this.arrFood = arrFood;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String[] getArrFood() {
return arrFood;
}
public void setArrFood(String[] arrFood) {
this.arrFood = arrFood;
}
@Override
public String toString() {
return "Human [name=" + name + ", age=" + age + ", arrFood=" + Arrays.toString(arrFood) + "]";
}
}
===================================================================
<%@page import="dto.Human"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
Human human = (Human)request.getAttribute("human");
System.out.println(human.toString());
String foodArr[] = human.getArrFood();
%>
<!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=UTF-8">
<title>Insert title here</title>
</head>
<body>
이름:<input type="text" value="<%=human.getName() %>">
<br><br>
나이:<input type="text" value="<%=human.getAge() %>">
<br><br>
<%
for(int i = 0;i < foodArr.length; i++){
%>
과일:<input type="text" value="<%=foodArr[i] %>">
<br>
<%
}
%>
</body>
</html>
===================================================================
package sample04;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import dto.Human;
public class HelloServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//값들을 얻어오는 곳 String name = req.getParameter("name");
String age = req.getParameter("age");
String arr[] = req.getParameterValues("food");
System.out.println("name = " + name);
int _age = Integer.parseInt(age.trim());
Human h = new Human(name, _age, arr);
req.setAttribute("human", h);
req.getRequestDispatcher("NewFile.jsp").forward(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
}
}
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