package com.kite.controller;import java.util.HashMap;import java.util.Map;import javax.validation.Valid;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.validation.BindingResult;import org.springframework.validation.annotation.Validated;import org.springframework.web.bind.annotation.ModelAttribute;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import com.kite.entity.User;/** * 简单的增删改查实现 * @author kite * */@Controller@RequestMapping(value={
   "/user"})public class UserController{    //简单数据模拟    Map
     
       map = new HashMap
      
       ();    public UserController()    {        map.put("zs", new User("zs", "123", "张三", "123dsad456"));        map.put("ll", new User("ll", "321", "李四", "123dsa456"));        map.put("ww", new User("ww", "32154", "王五", "dsa"));        map.put("zl", new User("zl", "5dsada", "赵六", "dsadsa"));    }    /**     * 显示列表     * @param model     * @return     */    @RequestMapping({
    "/list"})    public String list(Model model)    {        model.addAttribute("users", map);        return "user/list";    }    /**     * 到添加页面使用method请求的方式来区分     * @return     */    @RequestMapping(value={
   "/add"},method=RequestMethod.GET)    public String add(User user)    {        return "/user/add";    }    /**     * post请求方式实现真正的添加     * 使用bean validation     * BindingResult br 必须在@valid后面     * @return     */    @RequestMapping(value={
   "/add"}, method=RequestMethod.POST)    public String add(@Validated User user,  BindingResult br)    {        if(br.hasErrors())        {            //出错            return "user/add";        }        map.put(user.getUserName(), user);        return "redirect:/user/list";    }    /**     * 查看     * @param userName     * @param model     * @return     */    @RequestMapping({
    "/{userName}/show"})    public String show(@PathVariable String userName, Model model)    {        User user = map.get(userName);        model.addAttribute(user);        return "/user/show";    }    /**     * 到修改页面     * @param userName     * @return     */    @RequestMapping(value={
   "/{userName}/update"},method=RequestMethod.GET)    public String update(@PathVariable @ModelAttribute(value="userName") String userName, Model model)    {        User user = map.get(userName);        model.addAttribute(user);        return "/user/update";    }    /**     * 真正的更新     * @param userName     * @param user     * @param br     * @return     */    @RequestMapping(value={
   "/{userName}/update"},method=RequestMethod.POST)    public String update(@PathVariable String userName, @Valid User user, BindingResult br)    {        map.put(userName, user);        return "redirect:/user/list";    }    /**     * 删除的实现     * @param userName     * @return     */    @RequestMapping(value={
   "/{userName}/delete"},method=RequestMethod.GET)            public String delete(@PathVariable String userName)    {        map.remove(userName);        return "redirect:/user/list";    }}使用到bean validation的类  注解放在get方法只上package com.kite.entity;import javax.validation.constraints.Size;import org.hibernate.validator.constraints.Email;import org.hibernate.validator.constraints.NotEmpty;import org.hibernate.validator.constraints.Range;public class User{    private String userName;    private String password;    private String nickName;    private String email;    public User()    {        super();        // TODO Auto-generated constructor stub    }    public User(String userName, String password, String nickName, String email)    {        super();        this.userName = userName;        this.password = password;        this.nickName = nickName;        this.email = email;    }    @Override    public String toString()    {        return "User [userName=" + userName + ", password=" + password                + ", nickName=" + nickName + ", email=" + email + "]";    }    @NotEmpty(message="用户名不能为空")    public String getUserName()    {        return userName;    }        public void setUserName(String userName)    {        this.userName = userName;    }    @Size(min=6,max=18,message="密码的长度必须在6-18之间")    public String getPassword()    {        return password;    }        public void setPassword(String password)    {        this.password = password;    }    public String getNickName()    {        return nickName;    }    public void setNickName(String nickName)    {        this.nickName = nickName;    }    @Email(message="邮箱格式不符合")    public String getEmail()    {        return email;    }        public void setEmail(String email)    {        this.email = email;    }        }其他代码就不一一复制了