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java EE 开发入门小程序 mvc设计模式 学生信息的管理

2015-06-13 21:50 513 查看 
1.在mysql数据库中创建student数据库，创建studentInfo表(id,name,age)其中id是自动增加的键。2.创建web工程后，将java连接mysql的驱动粘贴至图中所示位置,同时在src下创建配置文件connectDB.properties             connectDB.properties文件的内容为(根据自己的账号密码情况修改)：   url jdbc:mysql://localhost:3306/studentdriver com.mysql.jdbc.Driverusername rootpassword 123 src下创建包com.amaker.util,在util包下创建DBUtil类，以实现java对mysql数据库的连接和关闭
package com.amaker.util;import java.io.IOException;import java.sql.Connection;import java.sql.DriverManager;import java.sql.SQLException;import java.util.Properties;public class DBUtil {public Connection openConnection(){String url=null;String driver=null;String username=null;String password=null;Connection conn=null;Properties prop=new Properties();try {prop.load(this.getClass().getClassLoader().getResourceAsStream("connectDB.properties"));url=prop.getProperty("url");driver=prop.getProperty("driver");username=prop.getProperty("username");password=prop.getProperty("password");Class.forName(driver);conn=DriverManager.getConnection(url,username,password);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}return conn;}public void closeConnection(Connection conn){if(conn!=null){try {conn.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}
3. src下创建包com.amaker.bean,com.amaker.Dao,com.amaker.daoImpl      bean包下创建Student类      
package com.amaker.bean;public class Student {String id;String name;int age;public String getId() {return id;}public void setId(String id) {this.id = id;}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;}}
 Dao包下创建接口StuDao     
package com.amaker.Dao;import java.util.List;import com.amaker.bean.Student;public interface StuDao {public boolean save(Student s);public List list();}
daoImpl包下创建实现接口StuDao的StuDaoImpl类  
package com.amaker.daoImpl;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import java.util.ArrayList;import java.util.List;import com.amaker.Dao.StuDao;import com.amaker.bean.Student;import com.amaker.util.DBUtil;public class StuDaoImpl implements StuDao {/*public static void main(String args[]){Student s=new Student();s.setName("sunxuejiao");s.setAge(24);StuDaoImpl stuDao=new StuDaoImpl();stuDao.save(s);List list=stuDao.list();for(int i=0;i<list.size();i++){Student s1=(Student)list.get(i);System.out.println(s1.getId());System.out.println(s1.getName());System.out.println(s1.getAge());}}*/public List list() {List list=new ArrayList();DBUtil util=new DBUtil();Connection conn=util.openConnection();String sql=" select id,name,age from studentInfo ";try {Statement statement=conn.createStatement();ResultSet rs=statement.executeQuery(sql);while(rs.next()){String id=rs.getString("id");String name=rs.getString("name");int age=rs.getInt("age");Student s=new Student();s.setId(id);s.setName(name);s.setAge(age);list.add(s);}} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{util.closeConnection(conn);}return list;}public boolean save(Student s) {boolean successful=true;String sql=" insert into studentInfo(name,age) values (?,?) ";DBUtil util=new DBUtil();Connection conn=util.openConnection();try {PreparedStatement statement=conn.prepareStatement(sql);statement.setString(1, s.getName());statement.setString(2, new Integer(s.getAge()).toString());statement.executeUpdate();} catch (SQLException e) {// TODO Auto-generated catch blocksuccessful=false;e.printStackTrace();}finally{util.closeConnection(conn);return successful;}}}
4.在web-root下创建文件夹pages，在pages下创建MyJsp.jsp，提供输入学生信息的页面  
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%><%String path = request.getContextPath();String myPath=path+"/servlet/StudentServlet";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 'MyJsp.jsp' starting page</title></head><body><form name="f1" id="f1" action=<%= myPath%> method="post"><table border="0"><tr><td>name:</td><td><input type="text" name="name" ></td></tr><tr><td>age:</td><td><input type="text" name="age" ></td></tr><tr><td colspan="2" align="center"><input type="submit" value="save"></td></tr></table></form></body></html>
5.在src下创建包com.amaker.servlet，创建StudentServlet类
package com.amaker.servletimport java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.amaker.bean.Student;import com.amaker.daoImpl.StuDaoImpl;public class StudentServlet extends HttpServlet {/*** Constructor of the object.*/public StudentServlet() {super();}/*** 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 {String name=request.getParameter("name");int age=new Integer(request.getParameter("age")).intValue();Student s=new Student();s.setName(name);s.setAge(age);StuDaoImpl sd=new StuDaoImpl();boolean successful=sd.save(s);request.setAttribute("successful", successful);System.out.println("succussful!");request.getRequestDispatcher("/pages/result.jsp").forward(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 {doGet(request,response);}/*** Initialization of the servlet. <br>** @throws ServletException if an error occurs*/public void init() throws ServletException {// Put your code here}}
6.web.xml中配置该servlet   
  <servlet><servlet-name>StudentServlet</servlet-name><servlet-class>com.amaker.servlet.StudentServlet</servlet-class></servlet><servlet-mapping><servlet-name>StudentServlet</servlet-name><url-pattern>/servlet/StudentServlet</url-pattern></servlet-mapping>
7.在web-root下创建包pages，在pages下创建保存学生信息成功后的界面，查询出所有学生的信息result.jsp
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%><%@ page import="com.amaker.daoImpl.StuDaoImpl" %><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><%String path = request.getContextPath();String myPath=path+"/servlet/StudentServlet";String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><%StuDaoImpl sd=new StuDaoImpl();List list=sd.list();request.setAttribute("stuList",list);%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>"><title>My JSP 'result.jsp' starting page</title></head><body><form name="f1" id="f1" action=<%= myPath%> method="post"><table border="0"><tr><td> </td><td><input type="text" name="name" ></td></tr><tr><td>age:</td><td><input type="text" name="age" ></td></tr>a5aa<tr><td colspan="2" align="center"><input type="submit" value="save"></td></tr></table></form><hr/><c:if test="${requestScope.successful}">save  successful!</c:if><br/><c:forEach var="stu" items="${stuList}">${stu.id}${stu.name}${stu.age}<br/></c:forEach></body></html>
8.开启tomcat，部署该工程后，在浏览器输入localhost:8080/studentInfoManage/pages/MyJsp.jsp 保存成功后显示的页面：注：本人还是菜鸟一个，第一次写web程序，很多疏漏不足之处，还请海涵。  
                                            

                                        

                        
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