mvcを使って簡単な数字分析アプリを作成してみよう！
実行例
ブラウザに
http://localhost:8080/numapp/Main
と入力するとフォームが表示される。
数字をカンマ区切りで入力する。（この際、数字は整数)
送信ボタンを押すと結果が表示される
戻るを押すと最初から
解答例
package model;
import java.io.Serializable;
public class Num implements Serializable{
private String org;
private int len;
private int max;
private int min;
private int sum;
public Num(){}
public String getOrg() {
return org;
}
public void setOrg(String org) {
this.org = org;
}
public int getLen() {
return len;
}
public void setLen(int len) {
this.len = len;
}
public int getMax() {
return max;
}
public void setMax(int max) {
this.max = max;
}
public int getMin() {
return min;
}
public void setMin(int min) {
this.min = min;
}
public int getSum() {
return sum;
}
public void setSum(int sum) {
this.sum = sum;
}
}
package model;
public class NumLogic {
public void execute(Num num){
String[] nums=num.getOrg().split(",");
int first=Integer.parseInt(nums[0]);
int max,min,sum;
max=min=sum=first;
for(int i=1;i<nums.length;i++){
int pick=Integer.parseInt(nums[i]);
if(pick>max){
max=pick;
}
if(pick<min){
min=pick;
}
sum+=pick;
}
num.setLen(nums.length);
num.setMax(max);
num.setMin(min);
num.setSum(sum);
}
}
package controller;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import model.Num;
import model.NumLogic;
@WebServlet("/Main")
public class Main extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
RequestDispatcher rd=request.getRequestDispatcher("/WEB-INF/view/form.jsp");
rd.forward(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String org=request.getParameter("org");
Num num=new Num();
num.setOrg(org);
NumLogic nl=new NumLogic();
nl.execute(num);
request.setAttribute("num", num);
RequestDispatcher rd=request.getRequestDispatcher("/WEB-INF/view/result.jsp");
rd.forward(request, response);
}
}
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8"/>
<title>Insert title here</title>
</head>
<body>
<p>数字をカンマ区切りで入力してください</p>
<form action="/numapp/Main" method="post">
<input type="text" name="org"><br>
<input type="submit" value="送信">
</form>
</body>
</html><%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" import="model.Num"%>
<%
Num num=(Num)request.getAttribute("num");
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8"/>
<title>Insert title here</title>
</head>
<body>
<p>元の文字列:<%=num.getOrg() %></p>
<p>要素数:<%=num.getLen() %></p>
<p>最大値:<%=num.getMax() %></p>
<p>最小値:<%=num.getMin() %></p>
<p>合計:<%=num.getSum() %></p>
<a href="/numapp/Main">戻る</a>
</body>
</html>
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