springboot webflux 异常处理（@ControllerAdvice）

我会带着你远行 2023-02-19 10:27 4阅读 0赞

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### sprigboot webflux 异常处理（@ControllerAdvice） ###

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**相关注解**

**ControllerAdvice**

@Target({ElementType.TYPE})
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    @Component
    public @interface ControllerAdvice {
        @AliasFor("basePackages")
        String[] value() default {};
    
        @AliasFor("value")
        String[] basePackages() default {};      //控制器通知作用的包
    
        Class<?>[] basePackageClasses() default {}; //控制器通知作用的类
    
        Class<?>[] assignableTypes() default {};
    
        Class<? extends Annotation>[] annotations() default {};
    }

**ExceptionHandler**

@Target({ElementType.METHOD})
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    public @interface ExceptionHandler {
        Class<? extends Throwable>[] value() default {};  //处理的异常类型
    }

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**示例**

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**advice 层**

**CustomControllerAdvice**

@ControllerAdvice(basePackages = {"com.example.demo.controller"})
    public class CustomControllerAdvice {
    
        @ExceptionHandler(RuntimeException.class)
        public String advice(Exception e){
            System.out.println(e.getMessage());
    
            return "error/404";
        }
    }

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**controller 层**

**HelloController**

@RestController
    public class HelloController {
    
        @RequestMapping("/hello")
        public String hello(Integer num){
            if (num.equals(2)){
                throw new RuntimeException("出错了");
            }
    
            return "success";
        }
    }

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**前端页面**

![20200620162111463.png][]

**404.html**

<!DOCTYPE html>
    <html lang="en" xmlns="http://www.w3.org/1999/xhtml"
          xmlns:th="http://www.thymeleaf.org" xmlns:sec="https://www.thymeleaf.org/thymeleaf-extras-springsecurity4">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>
    <body>
    <div th:align="center" style="color: green">
        页面丢失了
    </div>
    </body>
    </html>

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**使用测试**

**localhost:8080/hello?num=2**

![20200620162358611.png][]

[20200620162111463.png]: https://img-blog.csdnimg.cn/20200620162111463.png
[20200620162358611.png]: https://img-blog.csdnimg.cn/20200620162358611.png