package com.zed.model;

import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;

public class User {

    
    @NotNull(message="用户名不能为空")
    private String uname;
    
    @Size(min=4,max=8, message="密码长度应为{min}-{max}位")
    private String password;

    public String getUname() {
        return uname;
    }

    public void setUname(String uname) {
        this.uname = uname;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
    
    
}

package com.zed.web;

import javax.validation.Valid;

import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.zed.model.User;

@Controller
public class UserController {

    @RequestMapping(value="/userLogin", method=RequestMethod.POST)
    public String userLogin(@Valid User user, BindingResult result) {
        
        if(result.hasErrors()) {
            return "home";
        } else {            
            return "success";
        }
    }
}

<context:component-scan base-package="com.zed" />

<mvc:annotation-driven />

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/views/" />
    <property name="suffix" value=".jsp" />
</bean>

    <form action="userLogin" method="post">
        <label>user name</label>
        <input name="uname" type="text">
        <label>password</label>
        <input name="password" type="text">
        <input type="submit" value="submit">
    </form>