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使用Ajax实现实时数据库访问注册验证信息是否存在 -- 注册表单页面 login. -- 注册：用户名 + 密码 -- jsAjax页面$(function() {initEvent();}); // 注册验证函数initEvent()
Ajax实现实时访问数据库注册验证信息是否存在
--注册表单页面
login.html
--jsAjax页面
$(function(){
initEvent();
})
//注册验证
function initEvent(){
$("#name").bind("change",function(){
$.get("servlet/UserServlet?type=getUserByName",{"name":this.value},function(data){
if(data==1)
$("#span1").html("用户名已存在!不可用");
else
$("#span1").html("可以使用！");
});
})
}
--servlet处理页面
public class UserServlet extends HttpServlet {
IUserService service=new UserServiceImpl();
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("UTF-8");
String type=request.getParameter("type");
try {
Method mt=UserServlet.class.getMethod(type, HttpServletRequest.class,HttpServletResponse.class);
try {
mt.invoke(this, request,response);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
}
}
public void getUserByName(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{
String name =request.getParameter("name");
System.out.println(name);
if(service.getUserByName(name))
response.getWriter().print("1");
else
response.getWriter().print("2");
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}
--dao层访问页面
public class UserDaoImpl implements IUserDao{
public boolean getUserByName(String name){
String sql="select * from userinfo where name=?";
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