SpringMVC forward request

ForwardService.java

package com.vamdt.fox.fox.service;

import org.springframework.beans.factory.BeanFactoryUtils;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Service;
import org.springframework.util.Assert;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;
import java.util.Map;

@Service
public class ForwardService implements InitializingBean {

    @Autowired
    private ApplicationContext applicationContext;

    private RequestMappingHandlerMapping handlerMapping;

    private RequestMappingHandlerAdapter handlerAdapter;

    @Override
    public void afterPropertiesSet() throws Exception {
        Map<String, RequestMappingHandlerAdapter> handlerAdapterMap =
                BeanFactoryUtils.beansOfTypeIncludingAncestors(applicationContext, RequestMappingHandlerAdapter.class, true, false);
        if (!handlerAdapterMap.isEmpty()) {
            this.handlerAdapter = handlerAdapterMap.values().iterator().next();
        }
        Map<String, RequestMappingHandlerMapping> handlerMappingMap =
                BeanFactoryUtils.beansOfTypeIncludingAncestors(applicationContext, RequestMappingHandlerMapping.class, true, false);
        if (!handlerMappingMap.isEmpty()) {
            this.handlerMapping = handlerMappingMap.values().iterator().next();
        }

    }

    public ModelAndView forward(String mappingName, HttpServletRequest request, HttpServletResponse response) throws Exception {
        List<HandlerMethod> handlerMethods = this.handlerMapping.getHandlerMethodsForMappingName(mappingName);
        Assert.notEmpty(handlerMethods, "mapping name " + mappingName + " has not handler method!");
        Assert.isTrue(handlerMethods.size() < 2, "mapping name " + mappingName + " has more than one handler method!");
        HandlerMethod handlerMethod = handlerMethods.get(0).createWithResolvedBean();
        return handlerAdapter.handle(request, response, handlerMethod);
    }

}

HelloController.java

package com.vamdt.fox.fox;

import com.vamdt.fox.fox.service.ForwardService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Controller
public class HelloController {

    @Autowired
    private ForwardService forwardService;


    @PostMapping("/hello")
    @ResponseBody
    public String homeIsHome(HttpServletRequest request, HttpServletResponse response) throws Exception {
        forwardService.forward("PC#pong", request, response);
        return null;
    }
}

PingController.java

package com.vamdt.fox.fox;

import com.alibaba.fastjson.JSONObject;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class PingController {

    @PostMapping("/pong")
    @ResponseBody
    public String pong(@RequestBody JSONObject jsonObject) {
        return jsonObject.getString("name");
    }
}

test.log

curl -i -X POST -H "Content-Type:application/json" -d '{"name":"dahai"}' 'http://localhost:8080/hello'

---

> POST /hello HTTP/1.1
> User-Agent: curl/7.35.0
> Host: localhost:8080
> Accept: */*
> Content-Type:application/json
> Content-Length: 16
>
* upload completely sent off: 16 out of 16 bytes
< HTTP/1.1 200
HTTP/1.1 200
< Content-Type: text/plain;charset=UTF-8
Content-Type: text/plain;charset=UTF-8
< Content-Length: 5
Content-Length: 5
< Date: Fri, 20 Apr 2018 17:09:48 GMT
Date: Fri, 20 Apr 2018 17:09:48 GMT

<
* Connection #0 to host localhost left intact
dahai