SSH_框架整合5--验证用户名是否可用

1 emp-input.jsp中编写ajax验证用户名是否可用：　

 1 <script type="text/javascript" SRC="scripts/jquery-1.7.2.js"></script>
 2 <script type="text/javascript">
 3 $(function(){
 4     $(":input[name=lastName]").change(function(){
 5             var val = $(this).val();
 6             val = $.trim(val);
 7             var $this = $(this);
 8             
 9             if(val != ""){
10                 //把当前节点后面的所有 font 兄弟节点删除
11                 $this.nextAll("font").remove();
12                 
13                 var url="emp-validateLastName";
14                 var args={"lastName":val,"time":new Date()};
15                 $.post(url,args,function(data){
16                     //姓名可用
17                     if(data == "1"){
18                         $this.after("<font color='green'>LastName可用!</font>");
19                     }
20                     //不可用
21                     else if(data == "0"){
22                         $this.after("<font color='red'>LastName不可用!</font>");                        
23                     }
24                     //服务器错误
25                     else{
26                         alert("服务器错误!");
27                     }
28                 });
29             }else{
30                 alert("lastName不能为空！");
31                 $(this).val("");
32                 //$(this).focus();
33             }
34         });
35     })
36 </script>

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2 完善类：底层编写代码实现验证的方法：

　　(1)EmployeeDao.java

1 //4 校验注册的姓名是否可用
2     public Employee getEmployeeByLastName(String lastName){
3         String hql = "FROM Employee e WHERE e.lastName = ?";
4         Query query = getSession().createQuery(hql).setString(0, lastName);
5         Employee employee = (Employee) query.uniqueResult();
6         //System.out.println("***"+employee.getDepartment().getClass().getName());
7         return employee;
8     }

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　　(2)EmployeeService.java

1 //4 校验注册的姓名是否可用
2     public boolean lastNameIsValid(String lastName){
3         //在数据库中查完结果为null，说明没有被注册过
4         return employeeDao.getEmployeeByLastName(lastName) == null;
5     }

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　　(3)EmployeeAction.java　　

 1 //5 校验注册的姓名是否可用
 2     private String lastName;
 3     
 4     public void setLastName(String lastName) {
 5         this.lastName = lastName;
 6     }
 7     
 8     public String validateLastName() throws UnsupportedEncodingException{
 9         if(employeeService.lastNameIsValid(lastName)){
10             inputStream = new ByteArrayInputStream("1".getBytes("UTF-8")); 
11         }else{
12             inputStream = new ByteArrayInputStream("0".getBytes("UTF-8")); 
13         }
14         return "ajax-success";
15     }
16

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　　其中delete()方法的return修改为：return "ajax-success";

3 applicationContext.xml中修改为只读：

　　<tx:method name="lastNameIsValid" read-only="true"/>