基于springmvc的简单增删改查实现---中间使用到了bean validation

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<String, User> map = new HashMap<String, User>();
    public UserController()
    {
        map.put("zs", new User("zs", "", "张三", "123dsad456"));
        map.put("ll", new User("ll", "", "李四", "123dsa456"));
        map.put("ww", new User("ww", "", "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=,max=,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