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前端Web页面index.jsp
<%@page import="com.njupt.javaweb.business.Customer"%>
<%@page import="java.util.List"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="query.do" method="post">
<table>
<tr>
<td>名称:</td>
<td><input type="text" name="name"/></td>
</tr>
<tr>
<td>地址:</td>
<td><input type="text" name="address"/></td>
</tr>
<tr>
<td>手机号:</td>
<td><input type="text" name="phone"/></td>
</tr>
<tr>
<td><input type="submit" value="提交"/></td>
<td><a href="">创建用户</a></td>
</tr>
</table>
</form>
<br/>
<br/>
<hr/>
<br/>
<br/>
<%
List<Customer> listCustomer =(List<Customer>)request.getAttribute("listCustomer");
if( listCustomer!=null && listCustomer.size()>0){
%>
<table border="1" cellspacing="0px" cellpadding="10px">
<tr>
<th>ID</th>
<th>名称</th>
<th>地址</th>
<th>手机号</th>
</tr>
<%
for(Customer cus : listCustomer){
%>
<tr>
<td><%= cus.getId() %></td>
<td><%= cus.getName() %></td>
<td><%= cus.getAddress() %></td>
<td><%= cus.getPhone() %></td>
</tr>
<%
}
}
%>
</table>
</body>
</html>效果图
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定义一个类，用于保存查询的条件，实现模糊查询，该类可以是Customer的子类，也可是不是QueryCustomer.java
package com.njupt.javaweb.business;
/**
*
* 项目名称：javaWebMVCProject
* 类名称：QueryCustomer
* 类描述： 该对象用于业务查询的对象，
* 因为有时候查询的字段不是源对象的属性，所以需要查询对象来保存或者适配查询的属性
* 这个类就是用来适配模糊查询的属性
* 创建人：Administrator
* 创建时间：2018年8月6日 下午4:39:33
* 修改人：Administrator
* 修改时间：2018年8月6日 下午4:39:33
* 修改备注：
* @version
*/
public class QueryCustomer extends Customer {
private String name;
private String address;
private String phone;
public void setName(String name) {
if(name=="" || name == null)
this.name = "%";
else
this.name = "%" + name + "%";
}
public void setAddress(String address) {
if(address=="" || address == null)
this.address = "%";
else
this.address = "%" + address + "%";
}
public void setPhone(String phone) {
if(phone=="" || phone == null)
this.phone = "%";
else
this.phone = "%" + phone + "%";
}
public String getName() {
return name;
}
public String getAddress() {
return address;
}
public String getPhone() {
return phone;
}
public QueryCustomer() {}
public QueryCustomer(String name,String address,String phone) {
if(name=="" || name == null)
this.name = "%";
else
this.name = "%" + name + "%";
if(address=="" || address == null)
this.address = "%";
else
this.address = "%" + address + "%";
if(phone=="" || phone == null)
this.phone = "%";
else
this.phone = "%" + phone + "%";
}
@Override
public String toString() {
return "QueryCustomer [name=" + name + ", address=" + address + ", phone=" + phone + "]";
}
}
这里有个注意事项：
这几个输入框即使不输入任何内容，直接点击提交，其字段也不为null而是" "空格
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在CustomerServlet中编写query函数，实现模糊查询
private CustomerDAOJdbcImp customerDAOJdbcImp = new CustomerDAOJdbcImp(); private void query(HttpServletRequest request, HttpServletResponse response){ System.out.println("query"); try { request.setCharacterEncoding("UTF-8"); } catch (UnsupportedEncodingException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } String name = request.getParameter("name"); String address = request.getParameter("address"); String phone = request.getParameter("phone"); QueryCustomer queryCustomer = new QueryCustomer(name,address,phone); List<Customer> listCustomer = customerDAOJdbcImp.getForListWithQueryCustomer(queryCustomer); request.setAttribute("listCustomer", listCustomer); try { request.getRequestDispatcher("/index.jsp").forward(request, response); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } }
不出意外，页面就可以使用模糊查询了，如：
