spring mvc环境之异常错误码的统一返回（十五）

1.根据不同的请求方式，返回页面或json数据

　　1).创建统一权限异常处理类，所有的权限异常走一个端口

　　2).根据请求方式不同返回不同数据，页面请求返回403未授权页面，ajax请求返回json数据

package com.cc8w.exception;


import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.view.json.MappingJackson2JsonView;

import javax.servlet.http.HttpServletRequest;

@ControllerAdvice
public class MyExceptionAdvice {

    @ExceptionHandler(Exception.class)
    public ModelAndView showInfoE(Exception e, HttpServletRequest request){
        if (isAjaxRequest(request))
        {
            ModelAndView modelAndView=new ModelAndView(new MappingJackson2JsonView());
            modelAndView.addObject(AjaxResult.authError("错误1"));
            return modelAndView;
            //return new ModelAndView(AjaxResult.authError("您没有权限查看该数据").toString());
        }
        else {
            return new ModelAndView("error1");
        }

    }

    /**
     * 是否是Ajax异步请求
     * @param request
     */
    public static boolean isAjaxRequest(HttpServletRequest request) {
        String accept = request.getHeader("accept");
        if (accept != null && accept.indexOf("application/json") != -1) {
            return true;
        }

        String xRequestedWith = request.getHeader("X-Requested-With");
        if (xRequestedWith != null && xRequestedWith.indexOf("XMLHttpRequest") != -1) {
            return true;
        }

        String uri = request.getRequestURI();
        if (isContainStrs(uri, ".json", ".xml")) {
            return true;
        }

        String ajax = request.getParameter("__ajax");
        if (isContainStrs(ajax, "json", "xml")) {
            return true;
        }
        return false;
    }

    public static boolean isContainStrs(String str, String... strs) {
        if (str != null && strs != null) {
            for (String s : strs) {
                if (str.equalsIgnoreCase(s.trim())) {
                    return true;
                }
            }
        }
        return false;
    }

}

其中：AjaxResult.authError是系统自定义的json通用返回对象，包含code、msg、data等通用字段自己可以自定义设置。

主要涉及到ModelAndView、MappingJackson2JsonView  通过传入的类型来控制是页面ORjson字符串

2.返回统一的数据结果

 https://blog.csdn.net/zhangzengxiu/article/details/121622103

转：

https://blog.csdn.net/butioy_org/article/details/78718405

https://blog.csdn.net/s1040342522/article/details/123545878

https://www.cnblogs.com/chenzhubing/p/11438902.html

https://blog.csdn.net/weixin_56644618/article/details/127580941