springboot统一异常处理机制.java

//1当普通调用时，一般跳转到自定义的错误页面。
//2当ajax调用时，可返回约定的数据对象，方便页面统一处理。

import java.util.HashMap;
import java.util.Map;
 
import javax.servlet.http.HttpServletRequest;
 
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
 
import com.example.config.exception.MyBusinessException;
import com.example.config.exception.MyJsonException;
 
@ControllerAdvice
public class GlobalExceptionHandler {
    
    public static final String DEFAULT_ERROR_VIEW = "error";
    
    @ExceptionHandler(value = MyPageException.class)
    public ModelAndView businessExceptionHandler(HttpServletRequest req, Exception e) throws Exception {
        
        ModelAndView mav = new ModelAndView();
        mav.addObject("message", e.getMessage());
        mav.setViewName(DEFAULT_ERROR_VIEW);
        return mav;
    }
    
    @ExceptionHandler(value = MyJsonException.class)
    @ResponseBody
    public Map<String, String> jsonExceptionHandler(HttpServletRequest req, Exception e) {
        
        Map<String, String> re = new HashMap<String, String>();
        re.put("error", "1");
        re.put("msg", e.getMessage());
        return re;
    }
    
}