SpringMvc

package com.zhp.action;

import java.util.ArrayList;
import java.util.List;

import javax.validation.Valid;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.SessionAttributes;

import com.zhp.entity.User;
/**
 * 默认.action和.html都可访问
 *
 */
@Controller
@SessionAttributes({"user"})
public class UserAction {
    @RequestMapping("{index,main}")//数组，多个url映射
    public String index(){
        System.out.println("=======index()======");
        return "index";
    }
    
    //传参数 默认和形参名字保持一致即可
    @RequestMapping("login")
    public String login(Model model,String uname,String upass){
        System.out.println(uname+"==login()=="+upass);
        model.addAttribute("username", uname);
        return "index";
    }
    
    @RequestMapping("reg")
    public String reg(User user){//直接属性名对应赋值
        System.out.println("===reg():"+user);
        return "redirect:index.jsp";
//        return "forward:index.jsp";
    }

    //通过@RequestParam指定了页面参数和形参变量对应关系 但是默认要求必须传此参数 否则404
    @RequestMapping("detail")
    public String detail(@RequestParam("uname")String username){
        System.out.println("======detail()======"+username);
        return "detail";
    }
    //可以指定请求参数可有可无，但是注意数字类型最好使用包装类，否则null时异常，无法转为基本类型
    @RequestMapping("query")
    public String query(@RequestParam(required=false,value="id")Integer id){
        System.out.println("======query()======"+id);
        return "detail";
    }
    
    /**
     * 确认信息  
     * @ModelAttribute:封装同时，放入request对象
     * @param user  一定注意要有无参构造方法
     * @return
     */
    @RequestMapping("confirm")
//    public String confirm(@ModelAttribute("user")User user){
//        System.out.println("==confirm:"+user);
//        return "confirm";
//    }
     public String confirm(Model model){
        //默认使用user为key 放入request
        model.addAttribute(new User("AAAA","BBBB","CCCC"));
        System.out.println("-------confirm-----");
        return "confirm";
     }
    
    /**
     * 跳转到spring标签页面
     * @return
     */
    @RequestMapping("toadd")
//    public String toAdd(Model model){
//        model.addAttribute(new User());
//        return "add";
//    }
    //也可以直接参数user
    public String toAdd( User user){
        return "add";
    }
    
    public String doAdd(User user){
        
        return "index";
    }
    
    /**
     * 列表
     * @param model
     * @return
     */
    @RequestMapping("list")
    public String list(Model model){
        
        
        
        model.addAttribute("userlist", list);
        return "list";
    }
    
    private static List<User> list = null;;
    static{
        list = new ArrayList<User>();
        list.add(new User("曹操","2123","cao@sian.com"));
        list.add(new User("张飞","2222","zhang@sian.com"));
        list.add(new User("周瑜","3333","zhou@sian.com"));
    }
    
}