SpringMVC处理数据输出的实例代码

    //使用ModelAndView
    @RequestMapping("/output3")
    public ModelAndView output3(){
        ModelAndView modelAndView = new ModelAndView("success");    //viewName即为跳转页面
        modelAndView.addObject("msg","ModelAndView处理数据");
        return modelAndView;
    }

@Controller
public class OutputController {

    //使用Map
    @RequestMapping("/output")
    public String output(Map<String, Object> map){
        map.put("msg","输出数据处理");

        return "success";
    }

    //使用Model，一个接口
    @RequestMapping("/output1")
    public String output1(Model model){
        model.addAttribute("msg","model处理数据");

        return "success";
    }

    //使用ModelMap
    @RequestMapping("/output2")
    public String output2(ModelMap modelMap){
        modelMap.addAttribute("msg","modelMap处理数据");

        return "success";
    }
}

public class ModelMap extends LinkedHashMap<String, Object>

public class BindingAwareModelMap extends ExtendedModelMap
public class ExtendedModelMap extends ModelMap implements Model 

//给BindingAwareModelMap中保存的数据，同时在session中也保存一份，value指定保存数据时要给session中放的数据的key
//type只要是指定的类型的数据，session就会保存
@SessionAttributes(value = "msg",types = {String.class}) 
@Controller
public class OutputController

@Controller
public class ModelAttributeTestController {

    private Object o1;
    private Object o2;

    @RequestMapping("/updateBook")
    public String updateBook(@ModelAttribute Book book, ModelMap modelMap){
        o2 = modelMap;
        System.out.println(o1 == o2);   //true
        
        //参数使用注解，就不会new一个对象，而是使用从数据库中取出的对象
        return "success";
    }


    @ModelAttribute
    public void modelAttr(Map<String, Object> map){
        o1 = map;
        //此方法从数据库中取得数据，并提前于目标方法执行
    }
}