Springboot实现自定义错误页面的方法(错误处理机制)

 @Override public Map getErrorAttributes(WebRequest webRequest, ErrorAttributeOptions options) { Map errorAttributes = getErrorAttributes(webRequest, options.isIncluded(Include.STACK_TRACE)); if (Boolean.TRUE.equals(this.includeException)) { options = options.including(Include.EXCEPTION); } if (!options.isIncluded(Include.EXCEPTION)) { errorAttributes.remove("exception"); } if (!options.isIncluded(Include.STACK_TRACE)) { errorAttributes.remove("trace"); } if (!options.isIncluded(Include.MESSAGE) && errorAttributes.get("message") != null) { errorAttributes.put("message", ""); } if (!options.isIncluded(Include.BINDING_ERRORS)) { errorAttributes.remove("errors"); } return errorAttributes; } @Override @Deprecated public Map getErrorAttributes(WebRequest webRequest, boolean includeStackTrace) { Map errorAttributes = new LinkedHashMap<>(); errorAttributes.put("timestamp", new Date()); addStatus(errorAttributes, webRequest); addErrorDetails(errorAttributes, webRequest, includeStackTrace); addPath(errorAttributes, webRequest); return errorAttributes; }

 @RequestMapping(produces = MediaType.TEXT_HTML_VALUE) public ModelAndView errorHtml(HttpServletRequest request, HttpServletResponse response) { HttpStatus status = getStatus(request); Map model = Collections .unmodifiableMap(getErrorAttributes(request, getErrorAttributeOptions(request, MediaType.TEXT_HTML))); response.setStatus(status.value()); ModelAndView modelAndView = resolveErrorView(request, response, status, model); return (modelAndView != null) ? modelAndView : new ModelAndView("error", model); } @RequestMapping public ResponseEntity> error(HttpServletRequest request) { HttpStatus status = getStatus(request); if (status == HttpStatus.NO_CONTENT) { return new ResponseEntity<>(status); } Map body = getErrorAttributes(request, getErrorAttributeOptions(request, MediaType.ALL)); return new ResponseEntity<>(body, status); }

 @Override public ModelAndView resolveErrorView(HttpServletRequest request, HttpStatus status, Map model) { //获取错误状态码，这里可以看出他将状态码传入了resolve方法 ModelAndView modelAndView = resolve(String.valueOf(status), model); if (modelAndView == null && SERIES_VIEWS.containsKey(status.series())) { modelAndView = resolve(SERIES_VIEWS.get(status.series()), model); } return modelAndView; } private ModelAndView resolve(String viewName, Map model) { //从这里可以得知，当我们报404错误的时候，他会去error文件夹找404的页面，如果500就找500的页面。 String errorViewName = "error/" + viewName; //模板引擎可以解析这个页面地址就用模板引擎解析 TemplateAvailabilityProvider provider = this.templateAvailabilityProviders .getProvider(errorViewName, this.applicationContext); //模板引擎可用的情况下返回到errorViewName指定的视图地址 if (provider != null) { return new ModelAndView(errorViewName, model); } //模板引擎不可用，就在静态资源文件夹下找errorViewName对应的页面 error/404.html return resolveResource(errorViewName, model); }

   org.springframework.bootspring-boot-starter-thymeleaf org.springframework.bootspring-boot-starter-web org.springframework.bootspring-boot-starter-tomcatprovided

 package com.gzl.cn; import org.springframework.http.HttpStatus; import org.springframework.web.bind.annotation.ResponseStatus; @ResponseStatus(HttpStatus.NOT_FOUND) public class NotFoundException extends RuntimeException { public NotFoundException() { } public NotFoundException(String message) { super(message); } public NotFoundException(String message, Throwable cause) { super(message, cause); } }

 package com.gzl.cn.handler; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.core.annotation.AnnotationUtils; import org.springframework.web.bind.annotation.ControllerAdvice; import org.springframework.web.bind.annotation.ExceptionHandler; import org.springframework.web.bind.annotation.ResponseStatus; import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpServletRequest; @ControllerAdvice public class ControllerExceptionHandler { private final Logger logger = LoggerFactory.getLogger(this.getClass()); @ExceptionHandler(Exception.class) public ModelAndView exceptionHander(HttpServletRequest request, Exception e) throws Exception { logger.error("Requst URL : {}，Exception : {}", request.getRequestURL(),e); //假如是自定义的异常，就让他进入404，其他的一概都进入error页面 if (AnnotationUtils.findAnnotation(e.getClass(), ResponseStatus.class) != null) { throw e; } ModelAndView mv = new ModelAndView(); mv.addObject("url",request.getRequestURL()); mv.addObject("exception", e); mv.setViewName("error/error"); return mv; } }

 package com.gzl.cn.controller; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.GetMapping; import com.gzl.cn.NotFoundException; @Controller public class HelloController { //这个请求我们抛出我们定义的错误，然后被拦截到直接跳到404，这个一般当有一些数据查不到的时候手动抛出 @GetMapping("/test") public String test(Model model){ String a = null; if(a == null) { throw new NotFoundException(); } System.out.println(a.toString()); return "success"; } //这个请求由于a为null直接进500页面 @GetMapping("/test2") public String test2(Model model){ String a = null; System.out.println(a.toString()); return "success"; } }

    
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