java - 所有方法的 Spring ModelMap 对象

Question

为了更好地理解，这是一个示例 Spring Controller 代码:

@Controller  
public class SampleController {  
    protected String URL = "http://www.google.com/";    


    @RequestMapping(value = {listPath}, method = RequestMethod.GET)
    public String list1( ModelMap modelMap) {
        modelMap.addAttribute("url", URL);
        return "list1View";
    }

    @RequestMapping(value = {listPath}, method = RequestMethod.GET)
    public String list2( ModelMap modelMap) {
        modelMap.addAttribute("url", URL);
        return "list2View";
    }

    @RequestMapping(value = {listPath}, method = RequestMethod.GET)
    public String list3( ModelMap modelMap) {
        modelMap.addAttribute("url", URL);
        return "list3View";
    }

}

有更好的方法吗？将这个URL ModelMap对象传递给所有方法而不传入所有方法？

Answer 1

如果您想为所有 Controller 返回的模型传递通用值，请尝试将 @ControllerAdvice 与 @ModelAttribute 方法结合使用。

这里有一个快速解释。

Use @ModelAttribute at the method level to provide reference data for the model. @ModelAttribute annotated methods are executed before the chosen @RequestMapping annotated handler method. They effectively pre-populate the implicit model with specific attributes, often loaded from a database. Such an attribute can then already be accessed through @ModelAttribute annotated handler method parameters in the chosen handler method, potentially with binding and validation applied to it. In other words; a method annotated with @ModelAttribute will populate the specified “key” in the model. This happens BEFORE the @RequestMapping At Method Parameter level