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jsp+servlet+bean的MVC实例01

2016-03-23 15:09 393 查看

1、首先生成一个bean类，实现永久层的操作，即数据的存储，具体如下：

package com.servlet.day03MVC;

public class NumberBean {
private int numid;

private Double num;
public int getNumid() {
return numid;
}

public void setNumid(int numid) {
this.numid = numid;
}

public Double getNum() {
return num;
}

public void setNum(Double num) {
this.num = num;
}

}

2、其次，生成servlet，实现接收jsp表单传来的参数并根据传来的参数对bean进行操作，并返回参数给jsp展示。返回参数设置用request.setAttribute("randnum", numberBean.getNum());方法，返回参数由RequestDispatcher requestDispatcher=request.getRequestDispatcher("/mvcTest/randNumber.jsp");指向所要返回的jsp。

requestDispatcher.forward(request, response);

package com.servlet.day03MVC;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Random;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class RandNumberServlet extends HttpServlet {

public RandNumberServlet() {
super();
}

public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
NumberBean numberBean=new NumberBean();//实例化bean

//接收jsp返回的参数并操作bean存储
String numstartString=request.getParameter("numstart");
String numendString=request.getParameter("numend");
Integer numstartInt=Integer.parseInt(numstartString);
Integer numendInt=Integer.parseInt(numendString);
Random r=new Random();
Integer randInteger=r.nextInt(Math.abs(numendInt-numstartInt))+numstartInt;

numberBean.setNum(randInteger.doubleValue());

request.setAttribute("randnum", numberBean.getNum());//实现对返回给JSP的输出参数的设置

System.out.println(numberBean.getNum());//测试打印

//由下面的类及方法指向相应的jsp并返回

RequestDispatcher requestDispatcher=request.getRequestDispatcher("/mvcTest/randNumber.jsp");

requestDispatcher.forward(request, response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

doGet(request, response);
}

public void init() throws ServletException {
// Put your code here
}

}

3、创建JSP.实现表单的输入及接收参数的输出。

<%@ 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>mvcTest-randNumber</title>

</head>

<body>

<form action="randNumber">

请输入随机数生成的范围：<input type="text" name="numstart">至<input type="text" name="numend">

<input type="submit">

生成的随机数如下：

<%=request.getAttribute("randnum") %>

</form>

</body>

</html>

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标签： mvc jsp bean 表单 servlet

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