【Java Web】Jsp+Servlet+JavaBean+MySql入门级MVC实例
2014-04-17 19:34
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创建数据库的代码：
jsp文件的代码：
addInfo.jsp代码：
viewInfo.jsp代码：
JavaBean部分的代码：
Servlet部分的代码：
AddInfoServlet.java代码：
ViewInfoServlet.java代码：
填写个人信息界面：
提交之后显示全部的个人信息界面：
drop database if exists info; create database info; use info; create table infotable(name varchar(20), age varchar(10), mail varchar(100), time date);
jsp文件的代码：
addInfo.jsp代码：
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <form action="servlet/AddInfoServlet" method="post"> 请登记个人信息：<br> 姓名：<input type="text" name="name"/><br> 年龄：<input type="text" name="age"/><br> 邮箱：<input type="text" name="mail"/><br> <input type="submit" value="提交并查看"/> <input type="reset" value="重置"/> </form> </body> </html>
viewInfo.jsp代码：
<%@ page language="java" contentType="text/html;charset=gb2312"%>
<%@ page import="java.sql.*,info.*,java.util.*" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'viewInfo.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<center>所有用户信息如下：<hr>
</center>
<%
int infoCount=0;
//直接从request中获得所有记录
Collection messages=(Collection)request.getAttribute("messages");
Iterator it=messages.iterator();
while(it.hasNext())
{
InfoBean message=(InfoBean)it.next();
out.println("姓名："+message.getName()+"， 年龄："+message.getAge()+"， 邮箱："+message.getMail()+"， 时间："+message.getDate()+"<br>");
out.print("\n");
}
%>
</body>
</html>JavaBean部分的代码：
package info;
public class InfoBean {
private String name;
private String age;
private String mail;
private java.sql.Date date;
public void setName(String name)
{
this.name=name;
}
public String getName()
{
return name;
}
public void setAge(String age)
{
this.age=age;
}
public String getAge()
{
return age;
}
public void setMail(String mail)
{
this.mail=mail;
}
public String getMail()
{
return mail;
}
public void setDate(java.sql.Date date)
{
this.date=date;
}
public java.sql.Date getDate()
{
return date;
}
}Servlet部分的代码：
AddInfoServlet.java代码：
package info;
import java.util.*;
import java.sql.*;
import java.io.IOException;
import java.io.PrintWriter;
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 AddInfoServlet extends HttpServlet {
private Connection con=null;
/**
* Constructor of the object.
*/
public AddInfoServlet() {
//super();
String CLASSFORNAME="com.mysql.jdbc.Driver";
String SERVANDDB="jdbc:mysql://127.0.0.1:3306/info";
String USER="root";
String PWD="123456";
try
{
Class.forName(CLASSFORNAME).newInstance();
//建立数据库连接con
con=DriverManager.getConnection(SERVANDDB,USER,PWD);
System.out.println( "数据库加载成功" );
}
catch(Exception e)
{
//e.printStackTrace();//捕捉可能出现的异常
System.out.println( "数据库加载失败" );
}
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//System.out.println( "post方法" );
response.setContentType("text/html;charset=gb2312");
PrintWriter out = response.getWriter();
String name=request.getParameter("name");
String age=request.getParameter("age");
String mail=request.getParameter("mail");
try{
//向表中插入信息
PreparedStatement stm=con.prepareStatement("insert into infotable values(?,?,?,?)");
stm.setString(1,name);
stm.setString(2,age);
stm.setString(3,mail);
stm.setDate(4, new java.sql.Date(new java.util.Date().getTime()));
try{
stm.executeUpdate();
System.out.println( "插入信息成功" );
}
catch(Exception e)
{
System.out.println( "插入信息失败" );
}
//将请求转向ViewInfoServlet,用于查询数据库中的所有记录，然后调用JSP界面显示
RequestDispatcher requestDispatcher=request.getRequestDispatcher("ViewInfoServlet");
requestDispatcher.forward(request, response);//转发请求到ViewInfoServlet
System.out.println( "转发request" );
}
catch(Exception e)
{
e.printStackTrace();
}
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}ViewInfoServlet.java代码：
package info;
import java.util.*;
import java.sql.*;
import java.io.IOException;
import java.io.PrintWriter;
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 ViewInfoServlet extends HttpServlet {
private Connection con=null;
/**
* Constructor of the object.
*/
public ViewInfoServlet() {
//super();
String CLASSFORNAME="com.mysql.jdbc.Driver";
String SERVANDDB="jdbc:mysql://127.0.0.1:3306/info";
String USER="root";
String PWD="123456";
try
{
Class.forName(CLASSFORNAME).newInstance();
//建立数据库连接con
con=DriverManager.getConnection(SERVANDDB,USER,PWD);
System.out.println( "view连接数据库成功" );
}
catch(Exception e)
{
e.printStackTrace();//捕捉可能出现的异常
System.out.println( "连接数据库失败" );
}
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request,response);
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
Collection ret=new ArrayList();
try
{
Statement st=con.createStatement();
//查询表中有几条记录
ResultSet result=st.executeQuery("select count(*) from infotable");
int infoCount=0;
if(result.next())
{
infoCount=result.getInt(1);//得到infotable表中的记录数
result.close();
}
if(infoCount>0)
{
//按照时间顺序查询表infotable中的所有记录
result=st.executeQuery("select * from infotable order by time desc");
while(result.next())
{
String name=result.getString("name");
String age=result.getString("age");
String mail=result.getString("mail");
java.sql.Date date=result.getDate("time");
//创建InfoBean对象，用于存储数据库中的数据
InfoBean infoBO=new InfoBean();
infoBO.setName(name);
infoBO.setAge(age);
infoBO.setMail(mail);
infoBO.setDate(date);
ret.add(infoBO);
}
result.close();
st.close();
}
//将所有存储infoBO对象的集合添加到request对象中
request.setAttribute("messages", ret);
RequestDispatcher requestDispatcher = request.getRequestDispatcher("/viewInfo.jsp");
requestDispatcher.forward(request, response);//将request发送出去
}
catch(Exception e)
{
e.printStackTrace();
}
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}填写个人信息界面：
提交之后显示全部的个人信息界面：
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 
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