mvc增删改查（一）
2016-03-17 11:29
633 查看
index.jsp
<%@ page language="java" import="java.util.*" 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>选修课学生成绩表</title> </head> <body> <form action="/TomcatTest/StudentSer" method="post"> 姓名：<input type="text" name="name"/><br/> 学号：<input type="text" name="ID"/><br/> 年龄：<input type="text" name="age"/><br/> 专业：<input type="text" name="major"/><br/> 分数：<input type="text" name="grade"/><br/> <input type="submit" value="提交"/> </form> </body> </html>
注意action 要写xml中设置的路径
web.xml
servlet标签对应StudentSer类
<?xml version="1.0" encoding="UTF-8"?> <web-app id="WebApp_ID" version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <servlet> <!-- 逻辑名 --> <servlet-name>StudentSer</servlet-name> <!-- 物理名 --> <servlet-class>ser.StudentSer</servlet-class> </servlet> <servlet-mapping> <!-- 逻辑名 --> <servlet-name>StudentSer</servlet-name> <!-- 访问次Ser的url路径 --> <url-pattern>/StudentSer</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>/WEB-INF/index.jsp</welcome-file> </welcome-file-list> </web-app>
Student.java（要与数据库的表对应）
package model;
import java.util.Date;
public class Student {
private String name;
private String age;
private String ID;
private String major;
private String grade;
public Student(String name,String ID,String age,String major,String grade)
{
this.name=name;
this.ID=ID;
this.age=age;
this.major=major;
this.grade=grade;
}
public void print()
{
System.out.println("name="+this.name);
System.out.println("ID="+this.ID);
System.out.println("age="+this.age);
System.out.println("major="+this.major);
System.out.println("grade="+this.grade);
}
public Student()
{
}
public void setName(String name)
{
this.name = name;
}
public String getName()
{
return this.name;
}
public void setAge(String age)
{
this.age = age;
}
public String getAge()
{
return this.age;
}
public void setID(String ID)
{
this.ID = ID;
}
public String getID()
{
return this.ID;
}
public void setMajor(String major)
{
this.major = major;
}
public String getMajor()
{
return this.major;
}
public void setGrade(String grade){
this.grade = grade;
}
public String getGrade()
{
return this.grade;
}
}StudentSer.java (相当于controller，ser是servlet的简写，可以new servlet 会自动生成一些函数，但是我的eclipse不能新建servlet不能下一步【不知道为什么，也没查到好用的解决办法 有知道怎么弄的大神求告知】，只new class也是可以的)
servlet类 仅在第一次被请求时实例化（执行构造函数，初始化函数），以后常驻内存，再次被请求时不会执行构造函数和初始化函数，容器关闭时销毁（执行destroy）
package ser;
import impl.StudentImpl;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import model.Student;
/*
* 在JSP中,Ser它的作用是控制层 也就是获取前台的数据,并且把数据提交给业务逻辑层
*
* Ser起着桥梁的作用 它符合MVC设计模式
*
* V: view 视图 所有的JSP页面 ：功能：显示数据 获取数据
*
* C: control: 控制层 功能：获取视图层的数据,并且调用业务逻辑类
*
* M: Model: 负责数据录入 和业务逻辑的实现
*
* */
public class StudentSer extends HttpServlet {
/**
* Constructor of the object.
*/
public StudentSer() {
super();
System.out.println("----StudentSer-----");
}
/**
* Destruction of the servlet. <br>
*/
/* Ser 销毁的时候调用此方法 */
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
System.out.println("----destory----");
}
/**
* 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 {
this.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("----doPost----");
Student student = new Student();
request.setCharacterEncoding("utf-8");
student.setName(request.getParameter("name"));
student.setID(request.getParameter("ID"));
student.setAge(request.getParameter("age"));
student.setMajor(request.getParameter("major"));
student.setGrade(request.getParameter("grade"));
student.print();
StudentImpl studentImpl = new StudentImpl();
studentImpl.save(student);
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
// 初始化的方法,会在构造方法之后调用
public void init() throws ServletException {
// Put your code here
System.out.println("---init----");
}
}DbConnection.java
需要修改DataBaseName为自己的数据库名称 还有user和password为自己数据库的用户名和密码
package db;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class DbConnection {
private static final String driverName="com.microsoft.sqlserver.jdbc.SQLServerDriver";
private static final String url="jdbc:sqlserver://localhost:1433;DataBaseName=Student";
private static final String user="sa";
private static final String password="123456";
//加载驱动需要静态代码块
static{
try{
Class.forName(driverName);
}
catch(ClassNotFoundException e){
e.printStackTrace();
}
}
//获得连接对象的方法
public static Connection getConnection(){
Connection connection=null;
try{
connection=DriverManager.getConnection(url,user,password);
}
catch(SQLException e)
{
e.printStackTrace();
}
return connection;
}
//关闭资源对象的方法
public static void close(ResultSet rs,Statement st,Connection conn){
try{
if(rs!=null){
rs.close();
}
}
catch(SQLException e){
e.printStackTrace();
}
finally{
try{
if(st!=null){
st.close();
}
}catch(SQLException e){
e.printStackTrace();
}
finally
{
try{
if(conn!=null){
conn.close();
}
}
catch(SQLException e){
e.printStackTrace();
}
}
}
}
}StudentImpl.java
package impl;
import model.Student;
import db.DbConnection;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
public class StudentImpl {
public void save(Student student){
Connection con = null;
PreparedStatement ps = null;
DbConnection conns = new DbConnection();
con = conns.getConnection();
System.out.println("----sava----");
String sql ="insert into student(name,ID,age,major,grade) values(?,?,?,?,?)";
try{
ps = con.prepareStatement(sql);
ps.setString(1, student.getName());
ps.setString(2, student.getID());
ps.setString(3,student.getAge());
ps.setString(4, student.getMajor());
ps.setString(5,student.getGrade());
ps.executeUpdate();
}
catch(SQLException e){
e.printStackTrace();
} finally{
try{
con.close();
}catch(SQLException e){
e.printStackTrace();
}
}
}
}
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