用servlet来实现增删改数据库等功能

效果图

结构分层

web项目

index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>




  
  
  
  

  
  
  
  
  
  
  




  
${user.name},欢迎您
  

    查询所有用户信息
    
  

add.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>






    
    
    
    
    
    
    
    

    
    
    
    
    
    



    
添加联系人页面
    

        

            姓名：
            
        

        

            性别：
            男
            女
        

        

            年龄：
            
        

        

            籍贯：
            
                陕西
                北京
                上海
            
        

        

            QQ：
            
        

        

            Email：
            
        

        

            
            
            
        
    

list.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>





    
    
    
    
    
    
    
    

    
    
    
    
    
    
    

    



    
用户信息列表

    


        

            

                姓名
                
            
            

                籍贯
                
            

            

                邮箱
                
            
            查询
        

    

    


        添加联系人
        删除选中

    
    

        
            

        

            

            
编号
            
姓名
            
性别
            
年龄
            
籍贯
            
QQ
            
邮箱
            
操作
        

        

                

                
${s.count}
                
${user.name}
                
${user.gender}
                
${user.age}
                
${user.address}
                
${user.qq}
                
${user.email}
                
修改 
                    删除
            

        


    
    
    

        

            

                
                    

                

                
                    

                


                    
                        «
                    
                


                


                    
                        
${i}
                    
                    
                        
${i}
                    

                


                

                    
                        »
                    
                
                
                    共${pb.totalCount}条记录，共${pb.totalPage}页
                

            
        


    

login.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>




    
    
    
    

    
    
    
    
    
    
    



    
管理员登录
    

        

            用户名：
            
        

        

            密码：
            
        

        

            验证码：
            
            
                
            
        
        

        

            
        
    

    
    

        
            ×
        
        ${login_msg}
    

druid.properties
数据库连接属性

driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql:///student
username=root
password=123
initialSize=5
maxActive=10
maxWait=3000

JDBCUtils.java
连接数据库

package utils;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;

/**
 * @author DAJ
 * @version 1.0
 * @ClassName JDBCUtils
 * @date 2019/7/17 14:01
 */
public class JDBCUtils {
    private static DataSource ds;

    static {
        Properties pro =new Properties();
        InputStream is = JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties");
        try {
            pro.load(is);
            ds = DruidDataSourceFactory.createDataSource(pro);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static DataSource getDs(){
        return ds;
    }

    public static Connection getConn() throws SQLException {
        return  ds.getConnection();
    }

}

update.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>



    
        
        
        
        
        

        
        
        
        
    
    
        

        
修改联系人
        

            
            

          

            姓名：
            
          

          

            性别：
              
                  男
                  女
              

              
                  男
                  女
              


          

          

            年龄：
            
          

          

            籍贯：
             
                 
                    陕西
                    北京
                    上海
                 

                 
                     陕西
                     北京
                     上海
                 

                 
                     陕西
                     北京
                     上海
                 
            
          

          

            QQ：
            
          

          

            Email：
            
          

             

                
                
                
             
        
        
    

dao
先创建底层接口和实现方法
UserDao.java

package dao;

import entity.Person;

import java.util.List;

public interface UserDao {
    /**
     *功能描述 添加用户
     * @author DAJ
     * @date 2019/7/17
     * @param person
     * @return void
     */
    void addPerson(Person person);


    /**
     *功能描述 根据ID查询用户
     * @author DAJ
     * @date 2019/7/17
     * @param id
     * @return entity.Person
     */
    Person queryPersonById(int id);

    /**
     *功能描述 查询全部信息
     * @author DAJ
     * @date 2019/7/17
     * @param null
     * @return
     */
    List queryonly();

    /**
     *功能描述 修改用户
     * @author DAJ
     * @date 2019/7/17
     * @param person
     * @return void
     */
    void updatePerson(Person person);

    /**
     *功能描述 删除用户
     * @author DAJ
     * @date 2019/7/17
     * @param id
     * @return void
     */
    void delete(int id);
}

UserDaoImlpl.java

package dao.impl;


import dao.UserDao;
import entity.Person;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import utils.JDBCUtils;

import java.util.List;

/**
 * @author DAJ
 * @version 1.0
 * @ClassName UserDaoImpl
 * @date 2019/7/17 15:19
 */
public class UserDaoImpl implements UserDao {
    private static JdbcTemplate jt=null;
    static {
        jt = new JdbcTemplate(JDBCUtils.getDs());

    }

    @Override
    public void addPerson(Person person) {
        String sql="insert into web values (null,?,?,?,?,?,?)";
        jt.update(sql, person.getName(), person.getgender(), person.getAge(), person.getaddress(), person.getQq(), person.getEmail());
    }

    @Override
    public Person queryPersonById(int id) {
        String sql="select * from web where id=?";
        List query = jt.query(sql, new BeanPropertyRowMapper(Person.class), id);
        return query.get(0);

    }

    @Override
    public List queryonly() {
        String sql = "select * from web";
        List query = jt.query(sql, new BeanPropertyRowMapper(Person.class));
        return query;
    }

    @Override
    public void updatePerson(Person person) {
        String sql = "update web set name=?,gender=?,age=?,address=?,qq=?,email=? where id=?";
        jt.update(sql,person.getName(), person.getgender(), person.getAge(), person.getaddress(), person.getQq(), person.getEmail(),person.getId());
    }

    @Override
    public void delete(int id) {
        String sql="delete from web where id=?";
        jt.update(sql, id);
    }
}

Person.jsp

创建数据库类

package entity;

/**
 * @author DAJ
 * @version 1.0
 * @ClassName Person
 * @date 2019/7/17 13:59
 */
public class Person {
    private int id;
    private String name;
    private String gender;
    private int age;
    private String address;
    private int qq;
    private String email;

    public Person(int id, String name, String gender, int age, String address, int qq, String email) {
        this.id = id;
        this.name = name;
        this.gender = gender;
        this.age = age;
        this.address = address;
        this.qq = qq;
        this.email = email;
    }

    public Person() {

    }

    public Person( String name, String gender, int age, String address, int qq, String email) {
        this.name = name;
        this.gender = gender;
        this.age = age;
        this.address = address;
        this.qq = qq;
        this.email = email;
    }


    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;
    }

    public String getaddress() {
        return address;
    }

    public void setaddress(String address) {
        this.address = address;
    }

    public int getQq() {
        return qq;
    }

    public void setQq(int qq) {
        this.qq = qq;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "Person{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", gender='" + gender + '\'' +
                ", age=" + age +
                ", address='" + address + '\'' +
                ", qq=" + qq +
                ", email='" + email + '\'' +
                '}';
    }
}

service
IPersonService.java

    package service;
    
    import entity.Person;
    
    import java.util.List;
    
    public interface IPersonService {
        /**
         *功能描述 实现添加信息功能
         * @author DAJ
         * @date 2019/7/17
         * @param person
         * @return void
         */
        void addPerson(Person person);
    
        /**
         *功能描述 修改信息
         * @author DAJ
         * @date 2019/7/17
         * @param person
         * @return void
         */
        void updatePerson(Person person);
    
        /**
         *功能描述 显示全部信息
         * @author DAJ
         * @date 2019/7/17
         * @param
         * @return java.util.List
         */
        List selectAll();
    
        /**
         *功能描述 通过ID来删除
         * @author DAJ
         * @date 2019/7/17
         * @param id
         * @return void
         */
        void delete(int id);
    
        /**
         *功能描述 查询信息
         * @author DAJ
         * @date 2019/7/17
         * @param id
         * @return entity.Person
         */
        Person selectAll(int id);
    
    }

PersonServiceImpl

package service.impl;

import dao.UserDao;
import dao.impl.UserDaoImpl;
import entity.Person;
import service.IPersonService;

import java.util.List;

/**
 * @author DAJ
 * @version 1.0
 * @ClassName PersonServiceImpl
 * @date 2019/7/17 16:19
 */
public class PersonServiceImpl implements IPersonService {

    private  UserDao dao = new UserDaoImpl();

    @Override
    public void addPerson(Person person) {
        dao.addPerson(person);
    }

    @Override
    public void updatePerson(Person person) {
        dao.updatePerson(person);
    }

    @Override//全部信息
    public List selectAll() {
        return dao.queryonly();
    }

    @Override
    public void delete(int id) {
        dao.delete(id);
    }

    @Override
    public Person selectAll(int id) {
        return dao.queryPersonById(id);
    }
}

servlet
用注解来时间相关对应的操作
addUserServlet.java

package servlet;

import entity.Person;
import service.IPersonService;
import service.impl.PersonServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet( "/addUserServlet")
public class addUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");
        String name = request.getParameter("name");
        String gender = request.getParameter("gender");
        int age = Integer.parseInt(request.getParameter("age"));
        String address = request.getParameter("address");
        int qq=Integer.parseInt(request.getParameter("qq"));
        String email = request.getParameter("email");

        IPersonService is=new PersonServiceImpl();
        Person person = new Person(name,gender,age,address,qq,email);
        is.addPerson(person);
        response.sendRedirect("findUserByPageServlet");
    }
}

delSelectedServlet.java

package servlet;

import service.IPersonService;
import service.impl.PersonServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet( "/delSelectedServlet")
public class delSelectedServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        IPersonService is=new PersonServiceImpl();
        String[] ids = request.getParameterValues("uid");

        for (String id : ids) {
            is.delete(Integer.parseInt(id));
        }
        response.sendRedirect("findUserByPageServlet");
    }
}

delUserServlet.java

package servlet;

import service.IPersonService;
import service.impl.PersonServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet( "/delUserServlet")
public class delUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        int id = Integer.parseInt(request.getParameter("id"));

        IPersonService is = new PersonServiceImpl();
        is.delete(id);
        response.sendRedirect("findUserByPageServlet");
    }
}

findUserByPageServlet.java

package servlet;

import entity.Person;
import service.IPersonService;
import service.impl.PersonServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

@WebServlet( "/findUserByPageServlet")
public class findUserByPageServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        IPersonService is = new PersonServiceImpl();

        List list=is.selectAll();
        request.setAttribute("list",list);
        request.getRequestDispatcher("list.jsp").forward(request,response);

    }
}

findUserServlet.java

package servlet;

import entity.Person;
import service.IPersonService;
import service.impl.PersonServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet( "/findUserServlet")
public class findUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        IPersonService is = new PersonServiceImpl();
        int id = Integer.parseInt(request.getParameter("id"));

        Person person = is.selectAll(id);
        request.setAttribute("user", person);
        request.getRequestDispatcher("update.jsp").forward(request,response);
    }
}

updateUserServlet.java

package servlet;

import entity.Person;
import service.IPersonService;
import service.impl.PersonServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/updateUserServlet")
public class updateUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        IPersonService is=new PersonServiceImpl();

        request.setCharacterEncoding("utf-8");
        int id = Integer.parseInt(request.getParameter("id"));
        String name = request.getParameter("name");
        String gender = request.getParameter("gender");
        int age = Integer.parseInt(request.getParameter("age"));
        String address = request.getParameter("address");
        int qq = Integer.parseInt(request.getParameter("qq"));
        String email = request.getParameter("email");

        Person person = new Person(id, name, gender, age, address, qq, email);

        is.updatePerson(person);
        response.sendRedirect("findUserByPageServlet");

    }
}