springboot统一返回json数据格式并配置系统异常拦截方式

public class RtnMsg{
	
	private String rtnCode;
	
	private String rtnMsg="";
	
	private Object msg;
	
	public RtnMsg(String rtnCode,String rtnMsg,Object msg){
		this.rtnCode = rtnCode;
		this.rtnMsg = rtnMsg;
		this.msg = msg;
	}
	
	public RtnMsg(String rtnCode,String rtnMsg){
		this.rtnCode = rtnCode;
		this.rtnMsg = rtnMsg;
	}
	
	public RtnMsg(){
	}

	public String getRtnCode() {
		return rtnCode;
	}

	public void setRtnCode(String rtnCode) {
		this.rtnCode = rtnCode;
	}

	public String getRtnMsg() {
		return rtnMsg;
	}

	public void setRtnMsg(String rtnMsg) {
		this.rtnMsg = rtnMsg;
	}

	public Object getMsg() {
		return msg;
	}

	public void setMsg(Object msg) {
		this.msg = msg;
	} 
	
	
	

}

public class RtnCode {
	
	//正常返回
	public static final String STATUS_OK = "000";
	//参数错误
	public static final String STATUS_PARAM = "001";
	//接口未发现
	public static final String STATUS_NOFOUND = "404";
	//捕获到异常
	public static final String STATUS_SYSERROR = "500";
}

import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
/**
 * @author suntongxin
 * Create on 2017年12月12日下午1:55:12
 * All right reserved
 */
@ControllerAdvice
public class CommExceptionHandler {
	
	@ResponseBody
	@ExceptionHandler(value = Exception.class)
	public RtnMsg handle(Exception e){
		RtnMsg msg = new RtnMsg(RtnCode.STATUS_SYSERROR, "系统异常，异常原因："+e.getMessage());
		return msg;
	}
	

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
 * @author suntongxin
 * Create on 2017年12月12日下午1:55:27
 * All right reserved
 */
@Configuration
public class RtnMsgConfig{

	@Bean
	public ResponseBodyWrapFactoryBean getResponseBodyWrap(){
		
		return new ResponseBodyWrapFactoryBean();
		
	}
	

}

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.servlet.mvc.method.annotation.RequestMappingHandlerAdapter;
import org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor;
/**
 * @author suntongxin
 * Create on 2017年12月12日上午10:48:43
 * All right reserved
 */
public class ResponseBodyWrapFactoryBean implements InitializingBean{

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

}

package cn.seisys.common;

import org.springframework.core.MethodParameter;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodReturnValueHandler;
import org.springframework.web.method.support.ModelAndViewContainer;
/**
 * @author suntongxin
 * Create on 2017年12月12日上午10:48:54
 * All right reserved
 */
public class ResponseBodyWrapHandler implements HandlerMethodReturnValueHandler{
	
	private final HandlerMethodReturnValueHandler delegate;
	
	public ResponseBodyWrapHandler(HandlerMethodReturnValueHandler delegate){
		
		this.delegate = delegate;
		
	}

	@Override
	public boolean supportsReturnType(MethodParameter returnType) {
		
		return delegate.supportsReturnType(returnType);
		
	}

	@Override
	public void handleReturnValue(Object returnValue, MethodParameter returnType, ModelAndViewContainer mavContainer,
			NativeWebRequest webRequest) throws Exception {
		RtnMsg rtnMsg = null;
		if(returnValue instanceof RtnMsg){
			rtnMsg = (RtnMsg)returnValue;
		}else{
			rtnMsg = new RtnMsg(RtnCode.STATUS_OK,"",returnValue);
		}
		
		delegate.handleReturnValue(rtnMsg, returnType, mavContainer, webRequest);;
		
		
	}

}