1.注入属性
直接注入属性:
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public String userName;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this .userName = userName;
}
@Override
public String execute() throws Exception {
// TODO Auto-generated method stub
User user = new User();
user.setUserName(userName); //在这里需要将username接收到并且去使用。
UserDAO dao = new UserDAO();
HttpServletResponse response= ServletActionContext.getResponse();
PrintWriter out = response.getWriter();
if (dao.checkExists(user))
{
out.print( "" );
}
else
{
out.print( "" );
}
return null ;
}
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2.Domain Model 这是一般常用的方式
这里就不重复说明,
3.ModelDriven
第三种方法不常用,只需要了解;
其过程分为4个步骤:
(1)action实现ModelDriven<User>接口
(2) 添加抽象方法
(3)定义并初始化一个模型
User user=new User();
(4)生成setter和getter
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public class CheckUserAction extends ActionSupport implements ModelDriven<User>{
private User user = new User();
public User getUser() {
return user;
}
public void setUser(User user) {
this .user = user;
}
@Override
public String execute() throws Exception {
// TODO Auto-generated method stub
UserDAO dao = new UserDAO();
HttpServletResponse response= ServletActionContext.getResponse();
PrintWriter out = response.getWriter();
if (dao.checkExists(user))
{
out.print( "" );
}
else
{
out.print( "" );
}
return null ;
}
@Override
public User getModel() {
// TODO Auto-generated method stub
return user;
}
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注意:在使用方法1和3的时候前端及jsp代码部分无需需改,因为是直接调用的userName属性。
方法2需要将jquery中的username变为,user.username。