JsonViewSupportFactoryBean.java

package com.ejie.x38.control.view;

import java.util.ArrayList;
import java.util.List;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.method.support.HandlerMethodReturnValueHandler;
import org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter;
import org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor;

import com.ejie.x38.control.method.annotation.JsonMethodReturnValueHandler;

public class JsonViewSupportFactoryBean implements InitializingBean {

    @Autowired
    private RequestMappingHandlerAdapter adapter;
    @Override
    
    public void afterPropertiesSet() throws Exception {
        HandlerMethodReturnValueHandlerComposite returnValueHandlers = adapter.getReturnValueHandlers();
        List<HandlerMethodReturnValueHandler> handlers = new ArrayList(returnValueHandlers.getHandlers());
        decorateHandlers(handlers);
        adapter.setReturnValueHandlers(handlers);
    }
    
    private void decorateHandlers(List<HandlerMethodReturnValueHandler> handlers) {
        for (HandlerMethodReturnValueHandler handler : handlers) {
            if (handler instanceof RequestResponseBodyMethodProcessor)
            {
            	JsonMethodReturnValueHandler decorator = new JsonMethodReturnValueHandler();
                int index = handlers.indexOf(handler);
                handlers.add(index, decorator);
                break;
            }
        }        
    }

}