ssm前后端数据交互

修改提交的url id对应，将后台得到的数据放入model中，后台通过value="${customerById.cust_id }取出数据

        @RequestMapping(value="edit.do")
	public  String edit( Integer id,Model model){ 
		Customer customerById = customerService.selectCustomerById(id);
		model.addAttribute("customerById", customerById);
		return "update";			
	}

页面中的表单的name名称必须为Customer 这个类中对应的字段名

	@RequestMapping(value="update.do")
	public  String update( Customer customer){
		customerService.updateCustomerById(customer);
		return "redirect:/customer/list.do";
	}

也可以通过ModelAndView实现带参数页面跳转

  @RequestMapping(value="login")  
    public ModelAndView login(){  
        ModelAndView mav = new ModelAndView();  
        mav.setViewName("welcome"); //设置跳转页面  
          
        mav.addObject("message","hello kitty");  
          
        //List  
        List list = new ArrayList();  
        list.add("java");  
        list.add("c++");  
        list.add("oracle");  
        mav.addObject("bookList", list);  
          
        //Map  
        Map map = new HashMap();  
        map.put("zhangsan", "北京");  
        map.put("lisi", "上海");  
        map.put("wangwu", "深圳");  
        mav.addObject("map",map);  
          
        return mav;  
    }