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  • spring boot 异常处理(转)

    spring boot在异常的处理中,默认实现了一个EmbeddedServletContainerCustomizer并定义了一个错误页面到”/error”中,在ErrorMvcAutoConfiguration源码中可以看到

    /**
    * {@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;
    }

    }

    还配置了一个默认的白板页面,在源码可以看到

    @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;
    }

    }

    在路径的处理上,定义了一个BasicErrorController来处理异常,ErrorAttributes来装载错误异常到前端

    @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);
    }

    //... }

    默认只要你请求的content-type是”text/html”则返回一个白版页面给你,如果是其他的content-type,则返回一个json的数据给你。

    若你想自定义异常,可以通过以下方式来处理

    1.你可以默认在classpath:templates下定义一个error.ftl的freemarker模版来定义异常页面

    <!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来为某个特定的controller拦截异常,并返回一个json数据,当然你也可以定义全部的controller来拦截异常

    @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.还可以自定义server的错误页面

    @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"));
    }
    }
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  • 原文地址:https://www.cnblogs.com/jpfss/p/8465461.html
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