ssm框架配置全局异常

要求：既能返回ajax提交请求的异常信息，又能以指定的错误页面返回异常信息
***自定义异常

如果抛出此异常，系统会以json格式向前台返回异常信息
 * 使用方式： throw new MyException("这里填入异常信息，会发送到前台")
public class MyException extends Exception{
    private static final long serialVersionUID = 1L;
    // 异常信息
    private String message;

    public MyException() {
        super();
    }

    public MyException(String message) {
        super();
        this.message = message;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

}

***指定的异常页面

此异常类型用来向前台返回页面
public class ReturnViewException extends Exception{
    private static final long serialVersionUID = 1L;
    //异常信息
    public String message;
 
    public ReturnViewException (String message) {
        super(message);
        this.message = message;
    }
 
    public String getMessage() {
        return message;
    }
 
    public void setMessage(String message) {
        this.message = message;
    }
}

***逻辑处理

public class CustomHandleException implements HandlerExceptionResolver{

    @Override
    public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler,
            Exception exception) {
        //判断是否为ajax请求，默认不是
        boolean isAjaxRequest = false;  
        //这段代码能够得知是否为ajax请求，也就是我们说的json请求
        if(!StringUtils.isBlank(request.getHeader("x-requested-with")) && request.getHeader("x-requested-with").equals("XMLHttpRequest")){  
            isAjaxRequest = true; 
        }
        //如果是ajax请求
        if(isAjaxRequest) {
            MyException  myException = null;
            if(exception instanceof MyException) {
                myException = (MyException) exception;
            }else {
                //如果抛出的不是系统自定义的异常则重新构造一个未知错误异常
                //这里我就也有CustomException省事了，实际中应该要再定义一个新的异常
                myException = new MyException ("系统未知错误,请联系管理员");
            }
             String message = myException.getMessage();
             //向前台返回错误信息
             ModelAndView model = new ModelAndView();
             FastJsonJsonView view = new FastJsonJsonView();
             Map<String,Object> map = new HashMap<String,Object>();
             map.put("code", 500);
             map.put("message", message);
             view.setAttributesMap(map);
             model.setView(view);
             return model;
        }else {
            //如果不是ajax请求 那么异常后需要返回页面
            ReturnViewException returnViewException = null;
            //如果抛出的异常类型是我们预想的，会想前台返回我们指定在参数里的页面
            if(exception instanceof ReturnViewException) {
                returnViewException = (ReturnViewException) exception;
            }else {
                
                //系统默认跳转到error页面
                returnViewException = new ReturnViewException("error"); 
            }
             ModelAndView model = new ModelAndView();
             model.setViewName(returnViewException.getMessage());
             return model;
        }
        
    }

}

***配置springmvc.xml的全局异常处理器

<!-- 配置全局异常处理器 -->
    <bean id="customHandleException"    class="com.CIB.exception.CustomHandleException"/>