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
404.html
<!DOCTYPE html>
<html 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
