查询操作:

Servlet
         //1. 调用 CustomerDAO 的 getAll() 得到 Customer 的集合

List<Customer> customers = customerDAO.getAll();

//2. 把 Customer 的集合放入 request 中

request.setAttribute("customers", customers);

//3. 转发页面到 index.jsp(不能使用重定向)

request.getRequestDispatcher("/index.jsp").forward(request, response);

JSP

获取 request 中的 customers 属性

遍历显示

1.模糊查询

1).根据传入的 name, address, phone 进行模糊查询

例子: name: a   address: b    phone: 3

则 SQL 语句的样子为: SELECT id, name, address, phone FROM customers WHERE name LIKE ‘%a%’

AND address LIKE ‘%b%’ AND phone LIKE ‘%3%’

需在CustomerDAO接口中定义一个 getForListWithCriteriaCustomer(CriteriaCustomer cc)

其中 CriteriaCustomer 用于封装查询条件:name, address, phone。

因为查询条件很多时候和 domain 类并不相同,所以要做成一个单独的类拼 SQL:

SQL: "SELECT id, name, address, phone FROM customers WHERE  name LIKE ?

AND address LIKE ? ANDphone LIKE ?";

为了正确的填充占位符时,重写了 CriteriaCustomer 的 getter:

2).修改 Servlet:获取请求参数;把请求参数封装为CriteriaCustomer 对象,

再调用 getForListWithCriteriaCustomer(CriteriaCustomer cc) 方法

2.删除操作

1)超链接:delete.do?id=<%=customer.getId()%>
   Servlet 的 delete 方法:
                          获取 id

调用 DAO 执行删除

重定向到 query.do(若目标页面不需要读取当前请求的 request 属性,就可以使用重定向),

将显示删除后的 Customer 的 List

2).JSP 上的 jQuery 提示:确定要删除 xx 的信息吗?

CustomerDAO

package com.aff.mvcapp.dao;

import java.util.List;

import com.aff.mvcapp.domian.Customer;

public interface CustomerDAO {
public List<Customer> getForListWithCriteriaCustomer(CriteriaCustomer c);
public List<Customer> getAll(); public void save(Customer customer); public Customer get(Integer id); public void delete(Integer id); /**
* 返回和 name 相等的记录数
*
* @param name
* @return
*/
public long getCountWithName(String name); public void update(Customer customer);
}

CriteriaCustomer

package com.aff.mvcapp.dao;
public class CriteriaCustomer {
private String name;
private String address;
private String phone; public CriteriaCustomer() {
super();
}
public CriteriaCustomer(String name, String address, String phone) {
super();
this.name = name;
this.address = address;
this.phone = phone;
}
public String getName() {
if (name == null) {
name = "%%";
}else
name = "%"+name+"%";
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
if (address == null) {
address = "%%";
}else
address = "%"+address+"%";
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getPhone() {
if (phone == null) {
phone = "%%";
}else
phone = "%"+phone+"%";
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
@Override
public String toString() {
return "CriteriaCustomer [name=" + name + ", address=" + address + ", phone=" + phone + "]";
}
}

CustomerDAOImpl

package com.aff.mvcapp.dao.impl;
import java.util.List; import com.aff.mvcapp.dao.CriteriaCustomer;
import com.aff.mvcapp.dao.CustomerDAO;
import com.aff.mvcapp.dao.DAO;
import com.aff.mvcapp.domian.Customer; public class CustomerDAOImpl extends DAO<Customer> implements CustomerDAO { @Override
public List<Customer> getForListWithCriteriaCustomer(CriteriaCustomer c) {
String sql = "select id, name, address, phone from customers where name like ? and address like ? and phone like ?";
return
getForList(sql, c.getName(), c.getAddress(), c.getPhone());
}
@Override
public List<Customer> getAll() {
String sql = "select id, name, address, phone from customers";
return getForList(sql);
} @Override
public void save(Customer customer) {
String sql = "insert into customers(name,address,phone)values(?,?,?)";
update(sql, customer.getName(), customer.getAddress(), customer.getPhone());
} @Override
public Customer get(Integer id) {
String sql = "select id,name,address,phone from customers where id =?";
return get(sql, id);
} @Override
public void delete(Integer id) {
String sql = "delete from customers where id = ?";
update(sql, id); } @Override
public long getCountWithName(String name) {
String sql = "select count(id) from customers where name =?";
return getForValue(sql, name);
} @Override
public void update(Customer customer) {
String sql = "update customers set name = ?,address = ? ,phone = ? where id = ?";
update(sql, customer.getName(), customer.getAddress(), customer.getPhone(), customer.getId());
}
}

CustomerServlet

package com.aff.mvcapp.servlet;

import java.io.IOException;
import java.lang.reflect.Method;
import java.util.List; 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 com.aff.mvcapp.dao.CriteriaCustomer;
import com.aff.mvcapp.dao.CustomerDAO;
import com.aff.mvcapp.dao.impl.CustomerDAOImpl;
import com.aff.mvcapp.domian.Customer; @WebServlet("/customerServlet")
public class CustomerServlet extends HttpServlet {
private static final long serialVersionUID = 1L; private CustomerDAO customerDAO = new CustomerDAOImpl(); protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
} protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// 1. 获取ServletPath: /edit.do 或 addCustomer.do
String servletPath = request.getServletPath();
// 2.去除 / 和 .do 得到类似于 edit 或 addCustomer 这样的字符串
String methodName = servletPath.substring(1);
methodName = methodName.substring(0, methodName.length() - 3); try {
// 3.利用反射获取 methodName 对应的方法
Method method = getClass().getDeclaredMethod(methodName, HttpServletRequest.class,
HttpServletResponse.class);
// 4.利用反射调用对应的方法
method.invoke(this, request, response);
} catch (Exception e) {
// e.printStackTrace();
// 可以有一些响应
response.sendRedirect("error.jsp");
}
} private void edit(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("edit");
} private void update(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("update");
} private void query(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String name = request.getParameter("name");
String address = request.getParameter("address");
String phone = request.getParameter("phone"); CriteriaCustomer cc = new CriteriaCustomer(name, address, phone); // 1.调用 CustomerDAO 的 getForListWithCriteriaCustomer() 得到 Customer 的集合
List<Customer> customers = customerDAO.getForListWithCriteriaCustomer(cc); // 2.把 Customer 的集合放入 request 中
request.setAttribute("customers", customers); // 3.转发页面到 index.jsp 中( 不能使用重定向)
request.getRequestDispatcher("/index.jsp").forward(request, response); } private void delete(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String idstr = request.getParameter("id");
int id = 0;
// try-catch的作用 , 防止恶意的输入, idStr 不能转为int类型,若出异常 id直接为0
try {
id = Integer.parseInt(idstr);
customerDAO.delete(id);
} catch (Exception e) {
}
response.sendRedirect("query.do");
}
}

index.jsp

<%@page import="com.aff.mvcapp.domian.Customer"%>
<%@page import="java.util.List"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
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>Insert title here</title>
<script type="text/javascript" src="scripts/jquery-1.12.3.js"></script>
<script type="text/javascript">
$(function() {
$(".delete").click(function() {
//找到tr的第二个td也就是name,再获取它的value值
var content = $(this).parent().parent().find("td:eq(1)").text();
var flag = confirm("确定要删除" + content + "的信息吗")
return flag;
});
});
</script>

</head>
<body> <form action="query.do" method="post">
<table>
<tr>
<td>CustomerNam:</td>
<td><input type="text" name="name" /></td>
</tr>
<tr>
<td>Address:</td>
<td><input type="text" name="address" /></td>
</tr>
<tr>
<td>Phone:</td>
<td><input type="text" name="phone" /></td>
</tr>
<tr>
<td><input type="submit" value="Query" /></td>
<td><a href="">Add New Customer</a></td>
</tr>
</table>
</form> <br />
<br />
<br />
<br /> <%
List<Customer> customers = (List<Customer>) request.getAttribute("customers");
if (customers != null && customers.size() > 0) {
%>
<hr>
<br>
<br>
<table border="1" cellpadding="10" cellspacing="0">
<tr>
<td>ID</td>
<td>CustomersName</td>
<td>Address</td>
<td>Phone</td>
<td>UPDATE\DELETE</td>
</tr> <%
for (Customer customer : customers) {
%> <tr>
<td><%=customer.getId()%></td>
<td><%=customer.getName()%></td>
<td><%=customer.getAddress()%></td>
<td><%=customer.getPhone()%></td>
<td><a href="">UPDATE</a> <a
href="delete.do?id=<%=customer.getId()%>" class="delete">DELETE</a>
</td>
</tr> <%
}
%> </table> <%
}
%> </body>
</html>

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