java使用servlet进行增删改查（含源代码）

使用说明：

jdk:1.8

tomcat:1.9

数据库：mysql

资源下载链接：http://download.csdn.net/download/yuehailin/10205004

本篇博客使用servlet进行增删改查，c3p0连接数据库，下面是页面的效果展示。

主界面：

查询用户界面：

高级查询（模糊查询）：

需要使用的jar包：

博客结构截图：

c3p0-config.xml

    
        jdbc:mysql://localhost:3306/customer
        com.mysql.jdbc.Driver
        
        root
        
        123
        3
        10
        2
        10
    

CustomerDao.java

package dao;

import cn.itcast.jdbc.TxQueryRunner;
import domain.Customer;
import domain.PageBean;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;

import java.util.ArrayList;
import java.util.List;


public class CustomerDao
{
    private QueryRunner qr=new TxQueryRunner();

    public void add(Customer c)
    {
        try {
            String sql = "insert into t_customer values(?,?,?,?,?,?)";
            Object[] params = {c.getId(), c.getName(), c.getGender(),
                    c.getPhone(), c.getEmail(), c.getDescription()};

            qr.update(sql, params);
        }catch (Exception e)
        {
            throw new RuntimeException(e);
        }
    }

//    public List findAll()
//    {
//        try{
//            String sql="select * from t_customer";
//            return qr.query(sql,new BeanListHandler(Customer.class));
//        }catch (Exception e)
//        {
//            throw new RuntimeException(e);
//        }
//    }
    public PageBean findAll(int pc, int pr)
    {
        try{
            /*
             *1.他需要创建pageBean对象pb
             * 2.设置pb的pc和pr
             * 3.得到tr，设置给pb
             * 4.得到beanList设置给pb
             * 最后返回给pb
             */
            PageBean pb=new PageBean<>();
            pb.setPc(pc);
            pb.setPr(pr);

            String sql="select count(*) from t_customer";
            Number number=(Number) qr.query(sql,new ScalarHandler<>());

            int tr=number.intValue();
            pb.setTr(tr);

            sql="select * from t_customer order by name limit ?,?";
            Object[] params={(pc-1)*pr,pr};
            List beanList=qr.query(sql,new BeanListHandler<>(Customer.class),params);

            pb.setBeanList(beanList);

            return pb;
        }catch (Exception e)
        {
            throw new RuntimeException(e);
        }
    }

    public Customer find(String id)
    {
        try {
            String sql = "select * from t_customer where id=?";
            return qr.query(sql, new BeanHandler(Customer.class), id);
        }catch (Exception e)
        {
            throw new RuntimeException(e);
        }
    }

    public void edit(Customer customer)
    {
        try{
            String sql="update t_customer set name=?,gender=?,phone=?,email=?,description=? where id=?";
            Object[] params={customer.getName(),customer.getGender(),customer.getPhone(),customer.getEmail(),customer.getDescription(),customer.getId()};

            qr.update(sql,params);
        }catch (Exception e)
        {
            throw new RuntimeException(e);
        }
    }

    public void delete(String id)
    {
        try {
            String sql = "delete from t_customer where id=?";

            qr.update(sql, id);
        }catch (Exception e)
        {
            throw new RuntimeException(e);
        }
    }

//    public List query(Customer customer) {
//
//        try {
//            StringBuilder sql = new StringBuilder("select * from t_customer where 1=1 ");
//            List