JavaBean 在Servlet 和JSP页面传递

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使用Eclipse 创建一个动态页面工程,工程结构如下图。

该工程实现的功能如下：

1.在首页输入数据

2.数据交给HelloSerlet servlet。

3.Servlet 将输入数据封装成JavaBean的格式，保存为Request的属性。

4.将页面转发到main.jsp.

5.main.jsp 用JSP:useBean Tag 使用Servlet 的封装的JavaBean。

6.JSP页面显示JavaBean的数据。

详细代码如下：

1.首页（index.jsp）

<%@ page language="java" contentType="text/html; charset=ISO--1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<body>
<form action="HelloSerlet" method="POST">
First Name: <input type="text" name="first_name">
<br />
Last Name: <input type="text" name="last_name" />
<br/>
<input type="submit" value="Submit" />
</form>
</body>
</html>

2.Servlet(HelloSerlet)

package com.tomcattest;

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;

/**
* Servlet implementation class HelloSerlet
*/
@WebServlet("/HelloSerlet")
public class HelloSerlet extends HttpServlet {
private static final long serialVersionUID = 1L;
StudentEntity student = new StudentEntity();

/**
* @see HttpServlet#HttpServlet()
*/
public HelloSerlet() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
student.setFirstName(request.getParameter("first_name"));
student.setSecondName(request.getParameter("last_name"));

RequestDispatcher dispatcher = request.getRequestDispatcher("main.jsp");
request.setAttribute("student", student);
dispatcher.forward(request, response);
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}

}

3.JavaBean 类（StudentEntity）

package com.tomcattest;

import java.io.Serializable;

public class StudentEntity implements Serializable {

/**
*
*/
private static final long serialVersionUID = 1L;

public String firstName;
public String secondName;
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getSecondName() {
return secondName;
}
public void setSecondName(String secondName) {
this.secondName = secondName;
}

}

4.显示JavaBean信息页面（main.jsp）

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>JSP Servlet JavaBean</title>
</head>
<body>
<center>
<h1>Echo user input</h1>
<ul>
<jsp:useBean id="student" class = "com.tomcattest.StudentEntity" scope="session" ></jsp:useBean>

<li><p><b>First Name:</b>
<jsp:getProperty name="student" property="firstName"/>

</p></li>
<li><p><b>Last Name:</b>
<jsp:getProperty name="student" property="secondName"/>
</p></li>
</ul>
</body>
</html>

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