Question

用Ajax做一个验证用户是否存在，详细一点。尤其是Action里面怎么写的。是Jsp

Answer 1

// 验证界面的用户是否存在- action
private String User _name ;
public String execute() {
UserDAO dao = new User DAO();
User user = dao.findByName(User _name);
if (user == null) {
ok = false;
} else {
ok = true;
}
return "success";
}
//配置.

<action name="validUserName"
class="action地址">
<result type="json">
<param name="root">ok</param>
</result>
</action>