Servlet简单增删改查

前台页面是别人给的。

例子：

　　

package cn.itcast.cus.dao;

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.ResultSetHandler;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import cn.itcast.cus.domain.Customer;
import cn.itcast.jdbc.TxQueryRunner;

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

    public void add(Customer customer){
        String sql="INSERT INTO t_customer VALUES(?,?,?,?,?,?,?)";
        Object[] params={customer.getCid(),customer.getCname(),customer.getGender(),customer.getBirthday(),customer.getCellphone(),customer.getEmail(),customer.getDescription()};
        try {
            qr.update(sql, params);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }

    public List<Customer> findAll(){
        String sql="SELECT * FROM t_customer";
        ResultSetHandler<List<Customer>> rsh=new BeanListHandler<Customer>(Customer.class);
        ArrayList<Customer> customers=null;
        try {
            customers = (ArrayList<Customer>) qr.query(sql, rsh);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
        return customers;
    }

    public Customer load(String cid) {
        String sql="SELECT * FROM t_customer WHERE cid=?";
        ResultSetHandler<Customer> rsh=new BeanHandler<Customer>(Customer.class);
        Object[] params={cid};
        Customer customer=null;
        try {
            customer = qr.query(sql, rsh,params);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
        return customer;
    }

    public void update(Customer c){
        String sql="UPDATE t_customer SET cname=?,gender=?,birthday=?,cellphone=?,email=?,description=? WHERE cid=?";
        Object[] params={c.getCname(),c.getGender(),c.getBirthday(),c.getCellphone(),c.getEmail(),c.getDescription(),c.getCid()};
        try {
            qr.update(sql, params);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }

    public void delete(String cid) {
        String sql="DELETE FROM t_customer WHERE cid=?";
        Object[] params={cid};
        try {
            qr.update(sql, params);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }

    public List<Customer> query(Customer c) {
        StringBuilder sb=new StringBuilder("SELECT * FROM t_customer WHERE 1=1");
        ArrayList<Object> params=new ArrayList<Object>();

        String cname=c.getCname();
        if(cname!=null&& !cname.trim().isEmpty()){
            sb.append(" and cname like ?");
            params.add("%"+cname+"%");
        }
        String gender=c.getGender();
        if(gender!=null&&!gender.trim().isEmpty()){
            sb.append(" and gender=?");
            params.add(gender);
        }
        String cellphone=c.getCellphone();
        if(cellphone!=null &&!cellphone.trim().isEmpty()){
            sb.append(" and cellphone like ?");
            params.add("%"+cellphone+"%");
        }
        String email=c.getEmail();
        if(email!=null && !email.trim().isEmpty()){
            sb.append(" and email like ?");
            params.add("%"+email+"%");
        }
        String sql=sb.toString();
        System.out.println(sql);
        List<Customer> cus;
        try {
            cus=qr.query(sql, new BeanListHandler<Customer>(Customer.class),params.toArray());
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
        return cus;
    }
}

package cn.itcast.cus.dao;

import org.junit.Test;

import cn.itcast.cus.domain.Customer;
import cn.itcast.utils.CommonUtils;

public class CustomerTest {

    @Test
    public void fun1(){
        CustomerDao dao=new CustomerDao();
        for(int i=1;i<300;i++){
            Customer c=new Customer();
            c.setCid(CommonUtils.uuid());
            c.setCname("cstnm_"+i);
            c.setBirthday("2016-08-01");
            c.setGender(i%2==0?"男":"女");
            c.setCellphone("139"+i);
            c.setEmail("cstm_"+i+"@163.com");
            c.setDescription("我是客户");

            dao.add(c);
        }
    }

}

package cn.itcast.cus.domain;

import java.io.Serializable;

public class Customer implements Serializable{

    private static final long serialVersionUID = 1L;
    /**
     * 对应数据表
     */
    private String cid;//主键
    private String cname;//姓名
    private String gender;//性别
    private String birthday;//生日
    private String cellphone;//电话
    private String email;//邮箱
    private String description;//描述
    public Customer() {
        super();
        // TODO Auto-generated constructor stub
    }
    public Customer(String cid, String cname, String gender, String birthday,
            String cellphone, String email, String description) {
        super();
        this.cid = cid;
        this.cname = cname;
        this.gender = gender;
        this.birthday = birthday;
        this.cellphone = cellphone;
        this.email = email;
        this.description = description;
    }
    public String getCid() {
        return cid;
    }
    public void setCid(String cid) {
        this.cid = cid;
    }
    public String getCname() {
        return cname;
    }
    public void setCname(String cname) {
        this.cname = cname;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    public String getBirthday() {
        return birthday;
    }
    public void setBirthday(String birthday) {
        this.birthday = birthday;
    }
    public String getCellphone() {
        return cellphone;
    }
    public void setCellphone(String cellphone) {
        this.cellphone = cellphone;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    public String getDescription() {
        return description;
    }
    public void setDescription(String description) {
        this.description = description;
    }
    @Override
    public String toString() {
        return "Customer [cid=" + cid + ", cname=" + cname + ", gender=" + gender
                + ", birthday=" + birthday + ", cellphone=" + cellphone
                + ", email=" + email + ", description=" + description + "]";
    }

}

package cn.itcast.cus.service;

import java.util.List;

import cn.itcast.cus.dao.CustomerDao;
import cn.itcast.cus.domain.Customer;

public class CustomerService {
    private CustomerDao customerDao=new CustomerDao();

    public void addCustomer(Customer customer){
        customerDao.add(customer);
    }

    public List<Customer> findAll(){
        return customerDao.findAll();
    }

    public Customer load(String cid){
        return customerDao.load(cid);
    }

    public void update(Customer c){
        customerDao.update(c);
    }

    public void delete(String cid) {
        customerDao.delete(cid);
    }

    public List<Customer> query(Customer c) {
        return customerDao.query(c);
    }

}

package cn.itcast.cus.web.servlet;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import cn.itcast.cus.domain.Customer;
import cn.itcast.cus.service.CustomerService;
import cn.itcast.servlet.BaseServlet;
import cn.itcast.utils.CommonUtils;

public class CustomerServlet extends BaseServlet {
    private static final long serialVersionUID = 1L;
    CustomerService customerService=new CustomerService();

    public String add(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        /*
         * 1、补全表单数据到Customer对象
         * 2、补全Cid，使用uuid
         * 3、使用service方法完成添加工作
         * 4.向request域中保存成功信息
         * 5、转发到msg.jsp
         */
        Customer c=CommonUtils.toBean(request.getParameterMap(), Customer.class);
        c.setCid(CommonUtils.uuid());
        customerService.addCustomer(c);
        request.setAttribute("msg", "恭喜！注册成功");
        return "f:/msg.jsp";
    }

    public String findAll(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        /*
         * 1、直接调用service方法，得到查询结果
         * 2、查询结果保存到request域中
         * 3、转发到list.jsp
         */
        List<Customer> customers= customerService.findAll();
        request.setAttribute("customers", customers);
        return "f:/list.jsp";
    }

    public String preEdit(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        /*
         * 1、直接调用service方法，得到查询结果
         * 2、查询结果保存到request域中
         * 3、转发到EDIT.jsp
         */
        String cid=request.getParameter("cid");
        Customer c=customerService.load(cid);
        request.setAttribute("customer", c);
        return "f:/edit.jsp";
    }

    public String edit(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        /*
         * 1、封装表单数据到Customer对象中
         * 2、调用service完成编辑
         * 3、保存成功信息到request域
         * 4、转发到msg.jsp显示成功信息
         */
        Customer c=CommonUtils.toBean(request.getParameterMap(), Customer.class);
        customerService.update(c);
        request.setAttribute("msg", "恭喜，修改成功！");
        return "f:/msg.jsp";
    }

    public String delete(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        /*
         * 1、封装表单数据到Customer对象中
         * 2、调用service完成编辑
         * 3、保存成功信息到request域
         * 4、转发到msg.jsp显示成功信息
         */
        String cid=request.getParameter("cid");
        customerService.delete(cid);
        request.setAttribute("msg", "恭喜，删除成功！");
        return "f:/msg.jsp";
    }

    public String query(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        /*
         * 1、封装表单数据到Customer对象中
         * 2、调用service完成编辑
         * 3、保存查询到request域
         * 4、转发到list.jsp
         */
        Customer criteria=CommonUtils.toBean(request.getParameterMap(), Customer.class);
        List<Customer> customers=customerService.query(criteria);
        request.setAttribute("customers", customers);
        return "f:/list.jsp";
    }

}

<?xml version="1.0" encoding="UTF-8" ?>
<c3p0-config>
    <!-- 默认连接配置 -->
    <default-config>
        <!-- 连接四大参数配置  -->
        <property name="jdbcUrl">jdbc:mysql://127.0.0.1:3306/customers</property>
        <property name="driverClass">com.mysql.jdbc.Driver</property>
        <property name="user">guodaxia</property>
        <property name="password">961012gz</property>
            <!-- 池参数配置 -->
        <property name="acquireIncrement">3</property>
        <property name="initialPoolSize">10</property>
        <property name="minPoolSize">2</property>
        <property name="maxPoolSize">10</property>
    </default-config>

    <named-config name="oracle-config">
        <!-- 连接四大参数配置  -->
        <property name="jdbcUrl">jdbc:oracle:thin:@localhost:1521:db</property>
        <property name="driverClass">oracle.jdbc.driver.OracleDriver</property>
        <property name="user">scott</property>
        <property name="password">961012gz</property>
        <property name="acquireIncrement">3</property>
        <property name="initialPoolSize">10</property>
        <property name="minPoolSize">2</property>
        <property name="maxPoolSize">10</property>
    </named-config>

</c3p0-config>

后台代码

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>添加客户</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
    <link rel="stylesheet" type="text/css" href="<c:url value='/jquery/jquery.datepick.css'/>">
    <script type="text/javascript" src="<c:url value='/jquery/jquery-1.5.1.js'/>"></script>
    <script type="text/javascript" src="<c:url value='/jquery/jquery.datepick.js'/>"></script>
    <script type="text/javascript" src="<c:url value='/jquery/jquery.datepick-zh-CN.js'/>"></script>

<script type="text/javascript">
    $(function() {
        $("#birthday").datepick({dateFormat:"yy-mm-dd"});
    });

    function add() {
        $(".error").text("");
        var bool = true;
        if(!$(":text[name=cname]").val()) {
            $("#cnameError").text("客户名称不能为空");
            bool = false;
        }
        if(!$("#male").attr("checked") && !$("#female").attr("checked")) {
            $("#genderError").text("客户性别不能为空");
            bool = false;
        }
        if(!$(":text[name=cellphone]").val()) {
            $("#cellphoneError").text("手机不能为空");
            bool = false;
        }
        if(!$(":text[name=email]").val()) {
            $("#emailError").text("email不能为空");
            bool = false;
        }
        if(bool) {
            $("form").submit();
        }
    }

</script>
<style type="text/css">
    .error {color:red;}
</style>
  </head>

  <body>
<h3 align="center">添加客户</h3>
<form action="<c:url value='/CustomerServlet'/>" method="post">
    <!-- 向servlet传递一个名为method的参数，其值表示要调用servlet的哪一个方法 -->
    <input type="hidden" name="method" value="add"/>
<table border="0" align="center" width="40%" style="margin-left: 100px;">
    <tr>
        <td width="100px">客户名称</td>
        <td width="40%">
            <input type="text" name="cname"/>
        </td>
        <td align="left">
            <label id="cnameError" class="error">&nbsp;</label>
        </td>
    </tr>
    <tr>
        <td>客户性别</td>
        <td>
            <input type="radio" name="gender" value="男" id="male"/>
            <label for="male">男</label>
            <input type="radio" name="gender" value="女" id="female"/>
            <label for="female">女</label>
        </td>
        <td>
            <label id="genderError" class="error">&nbsp;</label>
        </td>
    </tr>
    <tr>
        <td>客户生日</td>
        <td>
            <input type="text" name="birthday" id="birthday" readonly="readonly"/>
        </td>
        <td>
            <label id="birthdayError" class="error">&nbsp;</label>
        </td>
    </tr>
    <tr>
        <td>手机</td>
        <td>
            <input type="text" name="cellphone"/>
        </td>
        <td>
            <label id="cellphoneError" class="error">&nbsp;</label>
        </td>
    </tr>
    <tr>
        <td>邮箱</td>
        <td>
            <input type="text" name="email"/>
        </td>
        <td>
            <label id="emailError" class="error">&nbsp;</label>
        </td>
    </tr>
    <tr>
        <td>描述</td>
        <td>
            <textarea rows="5" cols="30" name="description"></textarea>
        </td>
        <td>
            <label id="descriptionError" class="error">&nbsp;</label>
        </td>
    </tr>
    <tr>
        <td>&nbsp;</td>
        <td>
            <input type="button" value="添加客户" onclick="add()"/>
            <input type="reset" value="重置"/>
        </td>
        <td>&nbsp;</td>
    </tr>
</table>
</form>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>编辑客户</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
    <link rel="stylesheet" type="text/css" href="<c:url value='/jquery/jquery.datepick.css'/>">
    <script type="text/javascript" src="<c:url value='/jquery/jquery-1.5.1.js'/>"></script>
    <script type="text/javascript" src="<c:url value='/jquery/jquery.datepick.js'/>"></script>
    <script type="text/javascript" src="<c:url value='/jquery/jquery.datepick-zh-CN.js'/>"></script>

<script type="text/javascript">
    $(function() {
        $("#birthday").datepick({dateFormat:"yy-mm-dd"});
    });

    function add() {
        $(".error").text("");
        var bool = true;
        if(!$(":text[name=cname]").val()) {
            $("#cnameError").text("客户名称不能为空");
            bool = false;
        }
        if(!$("#male").attr("checked") && !$("#female").attr("checked")) {
            $("#genderError").text("客户性别不能为空");
            bool = false;
        }
        if(!$(":text[name=cellphone]").val()) {
            $("#cellphoneError").text("手机不能为空");
            bool = false;
        }
        if(!$(":text[name=email]").val()) {
            $("#emailError").text("email不能为空");
            bool = false;
        }
        if(bool) {
            $("form").submit();
        }
    }

</script>
<style type="text/css">
    .error {color:red;}
</style>
  </head>

  <body>
<h3 align="center">编辑客户</h3>
<form action="<c:url value='CustomerServlet'/>" method="post">
    <input type="hidden" name="method" value="edit">
    <input type="hidden" name="cid" value="${customer.cid }">
<table border="0" align="center" width="40%" style="margin-left: 100px;">
    <tr>
        <td width="100px">客户名称</td>
        <td width="40%">
            <input type="text" name="cname" value="${customer.cname }"/>
        </td>
        <td align="left">
            <label id="cnameError" class="error">&nbsp;</label>
        </td>
    </tr>
    <tr>
        <td>客户性别</td>
        <td>
            <input type="radio" name="gender" value="男" id="male" <c:if test="${customer.gender eq '男' }">checked='checked'</c:if> />
            <label for="male">男</label>
            <input type="radio" name="gender" value="女" id="female" <c:if test="${customer.gender eq '女' }">checked='checked'</c:if>/>
            <label for="female">女</label>
        </td>
        <td>
            <label id="genderError" class="error">&nbsp;</label>
        </td>
    </tr>
    <tr>
        <td>客户生日</td>
        <td>
            <input type="text" name="birthday" id="birthday" readonly="readonly" value="${customer.birthday }"/>
        </td>
        <td>
            <label id="birthdayError" class="error">&nbsp;</label>
        </td>
    </tr>
    <tr>
        <td>手机</td>
        <td>
            <input type="text" name="cellphone" value="${customer.cellphone }"/>
        </td>
        <td>
            <label id="cellphoneError" class="error">&nbsp;</label>
        </td>
    </tr>
    <tr>
        <td>邮箱</td>
        <td>
            <input type="text" name="email" value="${customer.email }"/>
        </td>
        <td>
            <label id="emailError" class="error">&nbsp;</label>
        </td>
    </tr>
    <tr>
        <td>描述</td>
        <td>
            <textarea rows="5" cols="30" name="description">${customer.description }</textarea>
        </td>
        <td>
            <label id="descriptionError" class="error">&nbsp;</label>
        </td>
    </tr>
    <tr>
        <td>&nbsp;</td>
        <td>
            <input type="button" value="编辑客户" onclick="add()"/>
            <input type="reset" value="重置"/>
        </td>
        <td>&nbsp;</td>
    </tr>
</table>
</form>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>主页</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>

<frameset rows="20%,*">
    <frame src="<c:url value='/top.jsp'/>" name="top"/>
    <frame src="<c:url value='/welcome.jsp'/>" name="main"/>
</frameset>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<jsp:forward page="/frame.jsp" />

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>客户列表</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>

  <body>
<h3 align="center">客户列表</h3>
<table border="1" width="70%" align="center">
    <tr>
        <th>客户姓名</th>
        <th>性别</th>
        <th>生日</th>
        <th>手机</th>
        <th>邮箱</th>
        <th>描述</th>
        <th>操作</th>
    </tr>
    <c:forEach var="c" items="${requestScope.customers }">
    <tr>
        <td>${c.cname }</td>
        <td>${c.gender }</td>
        <td>${c.birthday }</td>
        <td>${c.cellphone }</td>
        <td>${c.email }</td>
        <td>${c.description }</td>
        <td>
            <a href="<c:url value='/CustomerServlet?cid=${c.cid }&method=preEdit'/>">编辑</a>
            <a href="<c:url value='/CustomerServlet?cid=${c.cid }&method=delete'/>">删除</a>
        </td>
    </tr>
    </c:forEach>
</table>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>My JSP 'msg.jsp' starting page</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>

  <body>
    <h1 style="color:green;" align="center">${msg }</h1>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>高级搜索</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>

  <body>
<h3 align="center">高级搜索</h3>
<form action="<c:url value='/CustomerServlet'/>" method="post">
    <input type="hidden" name="method" value="query">
<table border="0" align="center" width="40%" style="margin-left: 100px;">
    <tr>
        <td width="100px">客户名称</td>
        <td width="40%">
            <input type="text" name="cname"/>
        </td>
    </tr>
    <tr>
        <td>客户性别</td>
        <td>
            <select name="gender">
                <option value="">==请选择性别==</option>
                <option value="男">男</option>
                <option value="女">女</option>
            </select>
        </td>
    </tr>
    <tr>
        <td>手机</td>
        <td>
            <input type="text" name="cellphone"/>
        </td>
        <td>
            <label id="cellphoneError" class="error">&nbsp;</label>
        </td>
    </tr>
    <tr>
        <td>邮箱</td>
        <td>
            <input type="text" name="email"/>
        </td>
        <td>
            <label id="emailError" class="error">&nbsp;</label>
        </td>
    </tr>
    <tr>
        <td>&nbsp;</td>
        <td>
            <input type="submit" value="搜索"/>
            <input type="reset" value="重置"/>
        </td>
        <td>&nbsp;</td>
    </tr>
</table>
</form>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base target="main">
    <title>My JSP 'top.jsp' starting page</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>

  <body style="text-align: center;">
      <h1>客户关系管理系统</h1>
    <a href="<c:url value='/add.jsp'/>">添加客户</a> 　|　
    <a href="<c:url value='/CustomerServlet?method=findAll'/>">查询客户</a>　|　
    <a href="<c:url value='/query.jsp'/>">高级搜索</a>　　
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>My JSP 'welcome.jsp' starting page</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->

  </head>

  <body>
    <h1 align="center">欢迎登录本系统</h1>
  </body>
</html>

jsp页面

js太恶心了就不传了，别人写的js总是有点看起来多。

感觉一些结构很清晰，很适合代码规范练习