spring boot 異常處理(轉)

最後更新：2018-02-24 來源：互聯網

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標籤：mbed his 處理 ref inter enc tor freemark 利用

spring boot在異常的處理中，預設實現了一個EmbeddedServletContainerCustomizer並定義了一個錯誤頁面到”/error”中，在ErrorMvcAutoConfiguration源碼中可以看到

/**
 * {@link EmbeddedServletContainerCustomizer} that configures the container‘s error
 * pages.
 */
private static class ErrorPageCustomizer
        implements EmbeddedServletContainerCustomizer, Ordered {

    private final ServerProperties properties;

    protected ErrorPageCustomizer(ServerProperties properties) {
        this.properties = properties;
    }

    @Override
    public void customize(ConfigurableEmbeddedServletContainer container) {
        container.addErrorPages(new ErrorPage(this.properties.getServletPrefix()
                + this.properties.getError().getPath()));
    }

    @Override
    public int getOrder() {
        return 0;
    }

}

還配置了一個預設的白板頁面，在源碼可以看到

@Configuration
@ConditionalOnProperty(prefix = "server.error.whitelabel", name = "enabled", matchIfMissing = true)
@Conditional(ErrorTemplateMissingCondition.class)
protected static class WhitelabelErrorViewConfiguration {

    private final SpelView defaultErrorView = new SpelView(
            "<html><body><h1>Whitelabel Error Page</h1>"
                    + "<p>This application has no explicit mapping for /error, so you are seeing this as a fallback.</p>"
                    + "<div id=‘created‘>${timestamp}</div>"
                    + "<div>There was an unexpected error (type=${error}, status=${status}).</div>"
                    + "<div>${message}</div></body></html>");

    @Bean(name = "error")
    @ConditionalOnMissingBean(name = "error")
    public View defaultErrorView() {
        return this.defaultErrorView;
    }

    // If the user adds @EnableWebMvc then the bean name view resolver from
    // WebMvcAutoConfiguration disappears, so add it back in to avoid disappointment.
    @Bean
    @ConditionalOnMissingBean(BeanNameViewResolver.class)
    public BeanNameViewResolver beanNameViewResolver() {
        BeanNameViewResolver resolver = new BeanNameViewResolver();
        resolver.setOrder(Ordered.LOWEST_PRECEDENCE - 10);
        return resolver;
    }

}

在路徑的處理上，定義了一個BasicErrorController來處理異常，ErrorAttributes來裝載錯誤異常到前端

@Controller
@RequestMapping("${server.error.path:${error.path:/error}}")
public class BasicErrorController extends AbstractErrorController {

    private final ErrorProperties errorProperties;

    //...

    @RequestMapping(produces = "text/html")
    public ModelAndView errorHtml(HttpServletRequest request,
            HttpServletResponse response) {
        response.setStatus(getStatus(request).value());
        Map<String, Object> model = getErrorAttributes(request,
                isIncludeStackTrace(request, MediaType.TEXT_HTML));
        return new ModelAndView("error", model);
    }

    @RequestMapping
    @ResponseBody
    public ResponseEntity<Map<String, Object>> error(HttpServletRequest request) {
        Map<String, Object> body = getErrorAttributes(request,
                isIncludeStackTrace(request, MediaType.ALL));
        HttpStatus status = getStatus(request);
        return new ResponseEntity<Map<String, Object>>(body, status);
    }

    //...}

預設只要你請求的content-type是”text/html”則返回一個白版頁面給你，如果是其他的content-type，則返回一個json的資料給你。

若你想自訂異常，可以通過以下方式來處理

1.你可以預設在classpath:templates下定義一個error.ftl的freemarker模版來定義異常頁面

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>

 <h1> error page !! </h1>

 ${timestamp?string(‘yyyy-MM-dd HH:mm:ss‘)}<br/><br/>
 ${status} <br/><br/>
 ${error} <br/><br/>
 ${message} <br/><br/>
 ${path} <br/><br/>

</body>
</html>

2.可以利用@ExceptionHandler來為某個特定的controller攔截異常，並返回一個json資料，當然你也可以定義全部的controller來攔截異常

@ControllerAdvice(basePackageClasses = FooController.class)
public class FooControllerAdvice extends ResponseEntityExceptionHandler {

    @ExceptionHandler(YourException.class)
    @ResponseBody
    ResponseEntity<?> handleControllerException(HttpServletRequest request, Throwable ex) {
        HttpStatus status = getStatus(request);
        return new ResponseEntity<>(new CustomErrorType(status.value(), ex.getMessage()), status);
    }

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

3.還可以自訂server的錯誤頁面

@Bean
public EmbeddedServletContainerCustomizer containerCustomizer(){
    return new MyCustomizer();
}

// ...

private static class MyCustomizer implements EmbeddedServletContainerCustomizer {

    @Override
    public void customize(ConfigurableEmbeddedServletContainer container) {
        container.addErrorPages(new ErrorPage(HttpStatus.BAD_REQUEST, "/500"));
    }
}

spring boot 異常處理(轉)

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

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