最近在写spring boot项目，写起来感觉有点繁琐，为了简化spring boot中的Controller开发，对ModelAndView进行简单的扩展，实现net mvc中ActionResult的写法

asp.net core mvc中控制器中提供了IActionResult接口来返回Aciton结果，可以用来返回视图view或者json,当然也可以实现接口返回自定义结果，当时写EasyCMS的时候实现过一个HtmlResult用来返回模板渲染生成的HTML内容，在asp.net core mvc中开发非常简便，那么我们可以看下在asp.net core mvc中的写法

//返回视图

[HttpGet]

public IActionResult Index(){

     return View();

}

//返回json

[HttpGet]

public IActionResult GetJson(){

     return Json();

}

//返回字符串

[HttpGet]

public IActionResult GetJson(){

     return Content();

}

再来看下在spring boot中原始的写法是啥样子的

    //返回index页面

   @GetMapping("/index")

    public String index() {

        return "home/index";

    }

   //或者

    @GetMapping("/tesView")

    public ModelAndView tesView(){

        return new ModelAndView("/home/testView");

    }

    //返回json

    @GetMapping("/getJson")

    @ResponseBody

    public Hashtable<String,Object> getJson(){

        Hashtable<String,Object> data=new Hashtable<>();

        data.put("status",true);

        data.put("message","message from json");

           return map;

    }

可以看到spring boot默认的写法并不是很简化，比如使用String返回视图view的时候必须指定视图路径，返回json比如添加@ResponseBody注解，

而使用ModelAndView 当视图路径和路由一致时是可以简化不写视图路径的 ，所以我们可以对ModelAndView来进一步扩展来简化控制器的开发，统一返回view或者json

1，首先定义一个ActionResult

public class ActionResult extends ModelAndView {

    public ActionResult()

    {

        super();

    }

    public ActionResult(View view)

    {

        super(view);

    }

}

2,在BaseController中来封装 ActionResult ，来提供统一的返回结果

package com.easycms.framework.web;

import cn.hutool.core.util.StrUtil;

import com.easycms.constant.JacksonConstants;

import com.easycms.framework.domain.DataTableDto;

import com.easycms.framework.domain.ResultAdaptDto;

import org.springframework.web.bind.annotation.ResponseBody;

import org.springframework.web.servlet.ModelAndView;

import org.springframework.web.servlet.view.json.MappingJackson2JsonView;

import java.util.Hashtable;

public class BaseController {

    /**

     * 返回页面

     */

    //public String view(String url){

     //   return url;

    //}

    /**

     * 页面跳转

     */

    public String redirect(String url)

    {

        return StrUtil.format("redirect:{}", url);

    }

    /**

     *

     * @author yushuo

     * @description //返回视图view

     * @date 14:15 2021/2/4

     * @param

     * @return com.easycms.framework.web.ActionResult

     **/

    protected ActionResult view() {

        return view(null);

    }

    /**

     *

     * @author yushuo

     * @description //返回视图view

     * @date 14:15 2021/2/4

     * @param [viewpath]

     * @return com.easycms.framework.web.ActionResult

     **/

    protected ActionResult view(String viewPath) {

        return view(viewPath,null);

    }

    /**

     *

     * @author yushuo

     * @description //返回视图view

     * @date 14:15 2021/2/4

     * @param [model]

     * @return com.easycms.framework.web.ActionResult

     **/

    protected ActionResult view(Object model) {

        return view(null, model);

    }

    /**

    *

     * @author yushuo

     * @description //返回视图view

     * @date 14:15 2021/2/4

     * @param [viewpath, model]

     * @return com.easycms.framework.web.ActionResult

    **/

    protected ActionResult view(String viewpath, Object model) {

        ActionResult r = new ActionResult();

        r.setViewName(viewpath);

        r.addObject("model", model);

        return r;

    }

    /**

    *

     * @author yushuo

     * @description //返回json

     * @date 14:15 2021/2/4

     * @param  [Hashtable<String,Object> data]

     * @return org.springframework.web.servlet.ModelAndView

    **/

    protected ActionResult json(Hashtable<String,Object> data) {

        ActionResult modelAndView = new ActionResult(JacksonConstants.mappingJackson2JsonView);

        modelAndView.addObject("message", null);

        modelAndView.addObject("code",0);

        modelAndView.addObject("status",true);

        modelAndView.addObject("data", data);

        return modelAndView;

    }

    /**

     *

     * @author yushuo

     * @description //返回json

     * @date 14:15 2021/2/4

     * @param  [ResultAdaptDto data]

     * @return org.springframework.web.servlet.ModelAndView

     **/

    protected ActionResult json(ResultAdaptDto data) {

        ActionResult modelAndView = new ActionResult(JacksonConstants.mappingJackson2JsonView);

       // modelAndView.addObject(data);

        modelAndView.addObject("message", null);

        modelAndView.addObject("code",0);

        modelAndView.addObject("status",true);

        modelAndView.addObject("data", data.getData());

        return modelAndView;

    }

    /**

     *

     * @author yushuo

     * @description //返回json

     * @date 14:15 2021/2/4

     * @param  [DataTableDto data]

     * @return org.springframework.web.servlet.ModelAndView

     **/

    protected ActionResult json(DataTableDto data) {

        ActionResult modelAndView = new ActionResult(JacksonConstants.mappingJackson2JsonView);

        modelAndView.addObject(data);

        return modelAndView;

    }

    /**

    *

     * @author yushuo

     * @description //请求失败

     * @date 14:20 2021/2/4

     * @param [message]

     * @return com.easycms.framework.web.ActionResult

    **/

    protected ActionResult error(String message){

        ActionResult modelAndView = new ActionResult(JacksonConstants.mappingJackson2JsonView);

        modelAndView.addObject("message", message);

        modelAndView.addObject("code",0);

        modelAndView.addObject("status",false);

        return modelAndView;

    }

    /**

     *

     * @author yushuo

     * @description //请求失败

     * @date 14:20 2021/2/4

     * @param

     * @return com.easycms.framework.web.ActionResult

     **/

    protected ActionResult error(){

        ActionResult modelAndView = new ActionResult(JacksonConstants.mappingJackson2JsonView);

        modelAndView.addObject("message", "请求失败");

        modelAndView.addObject("code",0);

        modelAndView.addObject("status",false);

        return modelAndView;

    }

    /**

     *

     * @author yushuo

     * @description //请求失败

     * @date 14:20 2021/2/4

     * @param [message]

     * @return com.easycms.framework.web.ActionResult

     **/

    protected ActionResult ok(String message){

        ActionResult modelAndView = new ActionResult(JacksonConstants.mappingJackson2JsonView);

        modelAndView.addObject("message", message);

        modelAndView.addObject("code",0);

        modelAndView.addObject("status",true);

        return modelAndView;

    }

    /**

     *

     * @author yushuo

     * @description //请求成功

     * @date 14:20 2021/2/4

     * @param

     * @return com.easycms.framework.web.ActionResult

     **/

    protected ActionResult ok(){

        ActionResult modelAndView = new ActionResult(JacksonConstants.mappingJackson2JsonView);

        modelAndView.addObject("message", "操作成功");

        modelAndView.addObject("code",0);

        modelAndView.addObject("status",true);

        return modelAndView;

    }

}

3，BaseController中用到的JacksonConstants

package com.easycms.constant;

import com.fasterxml.jackson.databind.MapperFeature;

import com.fasterxml.jackson.databind.ObjectMapper;

import com.fasterxml.jackson.databind.module.SimpleModule;

import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;

import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;

import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;

import org.springframework.web.servlet.view.json.MappingJackson2JsonView;

import java.text.SimpleDateFormat;

import java.util.TimeZone;

/**

 * @author yushuo

 * @className

 * @descripton TODO

 * @date 2021/2/5 13:47

 **/

public class JacksonConstants {

    /**

     * @author yushuo

     * @description //jackson ObjectMapper

     * @date 13:52 2021/2/5

     * @param

     * @return

    **/

    public static ObjectMapper objectMapper;

    /**

     * @author yushuo

     * @description //jackson MappingJackson2HttpMessageConverter

     * @date 13:52 2021/2/5

     * @param

     * @return

     **/

    public static  MappingJackson2HttpMessageConverter jackson2HttpMessageConverter;

    /**

     * @author yushuo

     * @description //jackson MappingJackson2JsonView

     * @date 13:52 2021/2/5

     * @param

     * @return

     **/

    public static MappingJackson2JsonView mappingJackson2JsonView;

    static {

        objectMapper=objectMapper();

        jackson2HttpMessageConverter=jackson2HttpMessageConverter();

        mappingJackson2JsonView=mappingJackson2JsonView();

    }

    /**

    *

     * @author yushuo

     * @description //jackson配置jackson2HttpMessageConverter

     * @date 13:49 2021/2/5

     * @param []

     * @return org.springframework.http.converter.json.MappingJackson2HttpMessageConverter

    **/

    private static MappingJackson2HttpMessageConverter jackson2HttpMessageConverter(){

        return new MappingJackson2HttpMessageConverter(objectMapper());

    }

    /**

    *

     * @author yushuo

     * @description //jackson配置 objectMapper

     * @date 13:51 2021/2/5

     * @param []

     * @return com.fasterxml.jackson.databind.ObjectMapper

    **/

    private static ObjectMapper objectMapper(){

        final Jackson2ObjectMapperBuilder builder=new Jackson2ObjectMapperBuilder();

        final ObjectMapper objectMapper=builder.build();

        SimpleModule simpleModule=new SimpleModule();

        simpleModule.addSerializer(Long.class, ToStringSerializer.instance);

        simpleModule.addSerializer(Long.TYPE,ToStringSerializer.instance);

        objectMapper.registerModule(simpleModule);

        objectMapper.configure(MapperFeature.PROPAGATE_TRANSIENT_MARKER,true);

        objectMapper.setTimeZone(TimeZone.getTimeZone("GMT+8"));

        objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));

        return objectMapper;

    }

    /**

     *

     * @author yushuo

     * @description //jackson配置

     * @date 13:49 2021/2/5

     * @param []

     * @return org.springframework.http.converter.json.MappingJackson2HttpMessageConverter

     **/

    private static MappingJackson2JsonView mappingJackson2JsonView(){

        return new MappingJackson2JsonView(objectMapper());

    }

}

4，实际使用

返回视图

    @GetMapping("/login")

    public ActionResult login(){

        return view("/home/login");

    }

   //或者

    @GetMapping("/login")

    public ActionResult login(){

        return view();

    }

   //或者

    @GetMapping("/login")

    public ActionResult login(){

         ModelMap model=new ModelMap();

         model.put("author","yushuo");

        return view(model);

    }

返回json

@GetMapping("/getJson")

 public ActionResult getJson(String id){

       Hashtable<String,Object> data=new Hashtable<>();

        data.put("id",id);

        return json(result);

    }

这样是不是就比原始的控制器开发简化多了呢

可以使用统一ActionResult来返回视图view或者json，整体代码风格看起来也更统一

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