springboot 后端异常处理跳转指定的页面

自定义异常

自定义Exception

定义一个Excpetion在发生错误的时候抛出，然后被异常处理类处理转发到对应异常页面

/**
 * 自定义异常类
 */
public class TestException extends RuntimeException {

    public TestException() {
    }

    public TestException(String message) {
        super(message);
    }

    public TestException fail(String message) {
        throw new TestException(message);
    }
}

前端异常页面

 因为主要的目的是跳转  所以随便写几个显示错误的页面

Controller层异常处理

import com.newbee.mall.util.Result;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;

@RestControllerAdvice
public class TestHandlerController {

    //该注解表示这个方法可以处理所有的异常
    @ExceptionHandler(Exception.class)
    public Object handlerException(HttpServletRequest request, Exception e) {
        //自定义结果集Result
        Result result = new Result();
        result.setResultCode(500);
        //判断是否为自定义异常
        if (e instanceof TestException) {
            result.setMessage(e.getMessage());
        } else {
            e.printStackTrace();
            result.setMessage("未知异常！请联系管理员！");
        }
        //检查请求是否为ajax, 如果是 ajax 请求则返回 Result json串, 如果不是 ajax 请求则返回 error 视图
        String contentTypeHeader = request.getHeader("Content-Type");
        String acceptHeader = request.getHeader("Accept");
        String xRequestedWith = request.getHeader("X-Requested-With");
        if ((contentTypeHeader != null && contentTypeHeader.contains("application/json"))
                || (acceptHeader != null && acceptHeader.contains("application/json"))
                || "XMLHttpRequest".equalsIgnoreCase(xRequestedWith)) {
            return result;
        } else {
            ModelAndView modelAndView = new ModelAndView();
            modelAndView.addObject("message", e.getMessage());
            modelAndView.addObject("url", request.getRequestURL());
            modelAndView.addObject("stackTrace", e.getStackTrace());
            modelAndView.setViewName("error/error");
            return modelAndView;
        }
    }
}

所有访问到Controller请求的异常都会被处理，如果是ajax请求就返回Json对象，如果不是ajax请求就跳转到error页面，显示出异常信息

全局异常处理

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.servlet.error.ErrorAttributes;
import org.springframework.boot.web.servlet.error.ErrorController;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.context.request.ServletWebRequest;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import java.util.Map;

@Controller
public class ErrorPageController implements ErrorController {

    private static ErrorPageController errorPageController;

    @Autowired
    private ErrorAttributes errorAttributes;

    private final static String ERROR_PATH = "/error";

    public ErrorPageController(ErrorAttributes errorAttributes) {
        this.errorAttributes = errorAttributes;
    }

    public ErrorPageController() {
        if (errorPageController == null) {
            errorPageController = new ErrorPageController(errorAttributes);
        }
    }

    @RequestMapping(value = ERROR_PATH, produces = "text/html")
    public ModelAndView errorHtml(HttpServletRequest request) {
        HttpStatus status = getStatus(request);
        if (HttpStatus.BAD_REQUEST == status) {
            return new ModelAndView("error/error_400");
        } else if (HttpStatus.NOT_FOUND == status) {
            return new ModelAndView("error/error_404");
        } else {
            return new ModelAndView("error/error_5xx");
        }
    }

    @RequestMapping(value = ERROR_PATH)
    @ResponseBody
    public ResponseEntity<Map<String, Object>> error(HttpServletRequest request) {
        Map<String, Object> body = getErrorAttributes(request, getTraceParameter(request));
        HttpStatus status = getStatus(request);
        return new ResponseEntity<Map<String, Object>>(body, status);
    }

    @Override
    public String getErrorPath() {
        return ERROR_PATH;
    }


    private boolean getTraceParameter(HttpServletRequest request) {
        String parameter = request.getParameter("trace");
        if (parameter == null) {
            return false;
        }
        return !"false".equals(parameter.toLowerCase());
    }

    protected Map<String, Object> getErrorAttributes(HttpServletRequest request, boolean includeStackTrace) {
        WebRequest webRequest = new ServletWebRequest(request);
        return this.errorAttributes.getErrorAttributes(webRequest, includeStackTrace);
    }

    private HttpStatus getStatus(HttpServletRequest request) {
        Integer statusCode = (Integer) request
                .getAttribute("javax.servlet.error.status_code");
        if (statusCode != null) {
            try {
                return HttpStatus.valueOf(statusCode);
            } catch (Exception ex) {
            }
        }
        return HttpStatus.INTERNAL_SERVER_ERROR;
    }
}

除了访问controller之外的所有异常都会被处理  根据httpStatusCode来判断是哪种异常并跳转到对应页面