我想在Spring Boot应用程序中自定义DefaultHandlerExceptionResolver
,但是发生异常时从未实现自定义实现。
build.gradle
buildscript {
ext {
springBootVersion = '2.1.1.RELEASE'
}
repositories {
mavenCentral()
}
}
plugins {
id 'java'
id 'org.springframework.boot' version '2.1.1.RELEASE'
id 'io.spring.dependency-management' version '1.0.6.RELEASE'
id 'io.franzbecker.gradle-lombok' version '1.14'
}
lombok {
version = '1.18.4'
sha256 = ""
}
group = 'ua.com.javaman'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
repositories {
mavenCentral()
}
dependencies {
implementation('org.springframework.boot:spring-boot-starter-web')
}
Application.java
@SpringBootApplication
@RestController
@Configuration
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
@ResponseBody
@PostMapping("/mouse")
public Mouse postMouse(@Valid Mouse mouse) {
// mouse creation logic
return mouse;
}
@Bean
public HandlerExceptionResolver customHandlerExceptionResolver() {
return new CustomExceptionHandlerResolver();
}
}
Mouse.java
@Value
public class Mouse {
private final Long id;
@NotEmpty
@Min(2)
private final String name;
}
CustomExceptionHandlerResolver.java
public class CustomExceptionHandlerResolver extends DefaultHandlerExceptionResolver {
@Override
protected ModelAndView handleBindException(
BindException ex, HttpServletRequest request, HttpServletResponse response, @Nullable Object handler
) throws IOException {
System.out.println("In CustomExceptionHandlerResolver");
response.sendError(HttpServletResponse.SC_BAD_REQUEST);
return new ModelAndView();
}
}
软件包结构
.
├── build.gradle
├── gradle
│ └── wrapper
│ ├── gradle-wrapper.jar
│ └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
├── LICENSE
├── README.md
├── settings.gradle
└── src
└── main
└── java
└── ua
└── com
└── javaman
└── exception_handling
├── Application.java
├── CustomExceptionHandlerResolver.java
└── Mouse.java
例如,当我使用
Mouse
实体的错误值调用应用程序时,POST localhost:8080/mouse?name=1
比
handleBindException()
中的 DefaultHandlerExceptionResolver
方法被调用但在我的CustomExceptionHandlerResolver
中没有被调用。如何使用
BindException
处理CustomExceptionHandlerResolver
? 最佳答案
默认情况下,SpringBoot的自动配置将始终创建a bunch of exception handlers,其中之一是DefaultHandlerExceptionResolver
(顺序为0)(值越低优先级越高)。默认情况下,您的处理程序将具有比这些默认值低的优先级,因此不会调用它,因为默认值已经处理了异常。
您可以使用WebMvcConfigurer
实现您的配置类,并覆盖extendHandlerExceptionResolvers()来修改默认设置。这个想法是找出DefaultHandlerExceptionResolver
实例并将其替换为您的实例。
但是一个更好的主意是使用CustomExceptionHandlerResolver
定义@ControllerAdvice
,以确保您不会弄乱默认设置,同时仍然添加所需的自定义行为(即使用逻辑来处理BindException
):
@Component
@ControllerAdvice
public class CustomExceptionHandlerResolver {
@ExceptionHandler(value= BindException.class)
@Override
protected ModelAndView handleBindException(
BindException ex, HttpServletRequest request, HttpServletResponse response, @Nullable Object handler)
throws IOException {
System.out.println("In CustomExceptionHandlerResolver");
response.sendError(HttpServletResponse.SC_BAD_REQUEST);
return new ModelAndView();
}
}