登录表格：
loginData类：
package com.demo.forms;
import org.hibernate.validator.constraints.Length;
import org.hibernate.validator.constraints.NotEmpty;
public class loginData {
@Length(min=4)
private String uname;
@NotEmpty
private String pwd;
public String getUname() {
return uname;
}
public void setUname(String uname) {
this.uname = uname;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
}
显示和提交表单的控制器方法:(显示包含注册表单和登录表单的主页)
@RequestMapping(value = "/",method=RequestMethod.GET)
public String showHome(Model model)
{
loginservice.logout();
model.addAttribute("logindata",new loginData());
model.addAttribute("signupdata",new signupData());
return "home";
}
@RequestMapping(value = "login",method=RequestMethod.POST)
public String submitloginForm(@Valid loginData logindata,SessionStatus state,Model model,BindingResult result)
{
if((loginservice.loggedin()) || (result.hasErrors()))
{
return showHome(model);
}
else
{
String uname = logindata.getUname();
String pwd = logindata.getPwd();
if(loginservice.login(uname,pwd))
{
model.addAttribute("user",uname);
return "redirect:profile";
}
else
{
model.addAttribute("message","Invalid Username/Password");
return showHome(model);
}
}
}
输入的数据为“有效”(正确或错误)时,登录正常.但是,当它无效时,例如,当密码字段为空或用户名长度少于四个字符时,将显示以下错误：
The request sent by the client was syntactically incorrect.
知道如何解决这个问题吗？
@RequestMapping(value = "login",method=RequestMethod.POST)
public String submitloginForm(@Valid loginData logindata,BindingResult result,Model model)
在本周的This Week in Spring – March 5th,2013博客文章中甚至提到了这一点
Someone asked me this the other day and I felt like it was worthy of a
mention: in your Spring MVC @Controller class handler methods,make
sure that the BindingResult argument is immediately after the model or
command argument,like this: @RequestMapping(…) public String
handleRequest( @modelattribute @Valid YourCustomPojo attempt,
BindingResult result). In this example,handleRequest will validate
the POJO (YourCustomPojo) – checking the POJO for JSR303-annotations
and attempting to apply the constraints because the POJO is annotated
with @Valid – and stash any errors in the BindingResult,which it
makes available if we ask for it.
春天会
> 0)确定处理程序方法
> 1)创建loginData的实例
> 2)填充它
> 3)验证它,并将验证结果存储在BindingResult中
> 4)无论何时绑定Result包含错误,都会调用该方法(使用loginData和BindingResult值)
