| id | 姓名 | 性别 | 年龄 | 操作 |
|---|---|---|---|---|
| <%=list.get(i).getId()%> | <%=list.get(i).getName()%> | <%=list.get(i).getGender()%> | <%=list.get(i).getAge()%> |
SpringMVC实现数据库的增删改查
使用SpringMVC实现数据库的增删改查，配合jQuery技术
- 提醒：本项目是在IDEA下的Maven工程中构建的，所以需要提前配置好maven，配置maven的详细过程可以参考我的另一篇文章
- 必要准备
提醒：本项目是在IDEA下的Maven工程中构建的，所以需要提前配置好maven，配置maven的详细过程可以参考我的另一篇文章
必要准备
- 添加springmvc.xml
1、在main下创建文件夹resources，并将其转化为resources root
2、在此文件夹中创建file 命名为springmvc.xml 并将一下代码复制进去
需要注意这里，如果包的结构很深入com.ssd.controller，则需要把下面这里对应修改
2. 配置pom.xml文件
在中添加一下依赖
//springmvc依赖
org.springframework
spring-context
${spring-version}
org.springframework
spring-beans
${spring-version}
org.springframework
spring-core
${spring-version}
org.springframework
spring-web
${spring-version}
org.springframework
spring-webmvc
${spring-version}
//数据库和jQuery依赖
mysql
mysql-connector-java
5.1.47
org.webjars
jquery
1.11.1
- 修改web.xml文件
//替换为一下代码
springMvc
org.springframework.web.servlet.DispatcherServlet
contextConfigLocation
classpath:springmvc.xml
1
springMvc
/
characterEncodingFilter
org.springframework.web.filter.CharacterEncodingFilter
encoding
UTF-8
forceEncoding
true
characterEncodingFilter
/*
- 前端页面
emp2.jsp、add.jsp、update.jsp
emp2.jsp代码：
<%@ page import="entity.Employee" %>
<%@ page import="java.util.List" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
无标题文档
//引入jquery的两句代码
<%List list = (List) request.getAttribute("list");%>
add.jsp
<%@ page import="entity.Employee" %>
<%@ page import="java.util.List" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
无标题文档
//引入jquery的两句代码
<%List list = (List) request.getAttribute("list");%>
id
姓名
性别
年龄
操作
<%for (int i = 0; i < list.size();i++){%>
<%=list.get(i).getId()%>
<%=list.get(i).getName()%>
<%=list.get(i).getGender()%>
<%=list.get(i).getAge()%>
<%}%>
update.jsp
<%@ page import="entity.Employee" %><%--
Created by IntelliJ IDEA.
User: GoldBech
Date: 2019/12/30
Time: 13:36
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="UTF-8"%>
无标题文档
<%Employee emp = (Employee)request.getAttribute("emp");%>
需要注意把这些页面都放在WEB-INF下：
实体类对象代码：
package entity;
public class Employee {
private int id;
private String name;
private String gender;
private int age;
public Employee(){
}
public Employee(String name,String gender, int age){
this.name = name;
this.gender = gender;
this.age = age;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
//dao层的代码
package dao;
import entity.Employee;
import java.sql.*;
import java.util.ArrayList;
import java.util.List;
public class EmployeeDao {
//数据库连接方法
public Connection getConnection() throws ClassNotFoundException, SQLException {
String url = "jdbc:mysql://localhost/employees?useSSL=FALSE&serverTimezone=UTC&characterEncoding=utf8";
String user = "root";
String password = "password";
String driver = "com.mysql.jdbc.Driver";
Class.forName(driver);
Connection conn = DriverManager.getConnection(url, user, password);
return conn;
}
//数据库关闭方法
public void closeAll(Connection conn, Statement state, ResultSet resultSet ){
try {
if (conn != null) {
conn.close();
}
if (state != null) {
state.close();
}
if (resultSet != null) {
resultSet.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
//查出所有的员工
public List search() {
List list = new ArrayList<>();
Connection conn = null;
Statement state = null;
ResultSet resultSet = null;
try {
//加载驱动
conn = getConnection();
state = conn.createStatement();
resultSet = state.executeQuery("select * from employee");
while (resultSet.next()) {
Employee employee = new Employee();
employee.setId(resultSet.getInt(1));
employee.setName(resultSet.getString(2));
employee.setGender(resultSet.getString(3));
employee.setAge(resultSet.getInt(4));
list.add(employee);
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
closeAll(conn,state,resultSet);
}
return list;
}
//查找需要修改的员工
public Employee search(int id) {
Employee emp = null;
Connection conn = null;
PreparedStatement state = null;
ResultSet resultSet = null;
try {
//加载驱动
conn = getConnection();
String sql = "select * from employee where id = ?";
state = conn.prepareStatement(sql);
state.setInt(1,id);
resultSet = state.executeQuery();
while (resultSet.next()) {
emp = new Employee();
emp.setId(resultSet.getInt(1));
emp.setName(resultSet.getString(2));
emp.setGender(resultSet.getString(3));
emp.setAge(resultSet.getInt(4));
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
closeAll(conn,state,resultSet);
}
return emp;
}
//判断是否添加成功
public boolean add(Employee emp){
Connection conn = null;
Statement state = null;
int resultSet = 0;
try {
//加载驱动
conn = getConnection();
state = conn.createStatement();
String sqlInsert = "insert into employee(name, gender,age) values ('"+emp.getName()+"','"+emp.getGender()+"',"+emp.getAge()+")";
resultSet = state.executeUpdate(sqlInsert);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
closeAll(conn,state,null);
}
return resultSet > 0;
}
//判断是否修改成功
public boolean update(Employee emp){
Connection conn = null;
PreparedStatement state = null;
int resultSet = 0;
try {
//加载驱动
conn = getConnection();
String sqlAlter = "update employee set name=?,gender=?,age=? where id = ? ";
state = conn.prepareStatement(sqlAlter);
state.setString(1,emp.getName());
state.setString(2,emp.getGender());
state.setInt(3,emp.getAge());
state.setInt(4,emp.getId());
resultSet = state.executeUpdate();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
closeAll(conn,state,null);
}
return resultSet > 0;
}
public boolean delete(int id) {
Connection conn = null;
PreparedStatement state = null;
int resultSet = 0;
try {
//加载驱动
conn = getConnection();
String sqlAlter = "delete from employee where id = ? ";
state = conn.prepareStatement(sqlAlter);
state.setInt(1,id);
resultSet = state.executeUpdate();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} finally {
closeAll(conn,state,null);
}
return resultSet > 0;
}
}
//controller层代码
package controller;
import dao.EmployeeDao;
import entity.Employee;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import java.util.List;
@Controller
@RequestMapping(“emp”)
public class EmployeeController {
@RequestMapping("search")
public ModelAndView search(){
EmployeeDao empDao = new EmployeeDao();
List list = empDao.search();
ModelAndView mv = new ModelAndView("emp2");
mv.addObject("list",list);
return mv;
}
@RequestMapping("showAdd")
public String showAdd(){
return "add";
}
@RequestMapping("add")
public String add(Employee emp){
EmployeeDao empDao = new EmployeeDao();
boolean flag = empDao.add(emp);
return "redirect:search";
}
@RequestMapping("showUpdate")
public ModelAndView showUpdate(int id){
EmployeeDao empDao = new EmployeeDao();
Employee emp = empDao.search(id);
ModelAndView mv = new ModelAndView("update");
mv.addObject("emp",emp);
return mv;
}
@RequestMapping("update")
public String update(Employee emp){
EmployeeDao empDao = new EmployeeDao();
boolean flag = empDao.update(emp);
return "redirect:search";
}
@RequestMapping("delete")
public String delete(int id){
EmployeeDao empDao = new EmployeeDao();
empDao.delete(id);
return "redirect:search";
}
}
运行效果：
