我的項目中,使用spring cloud gateway作爲路由,根據路由規則訪問不同的api,api中使用的是fegin,當api未啓動或者出現異常時候,會返回以下的異常信息
而正常的情況我們接口返回的數據是經過封裝的,所以我們需要將這裏的異常也進行處理,使其數據格式與我們接口中保持一致,方便前端進行統一處理。
獲取及重新捕獲異常的代碼:
import org.springframework.boot.autoconfigure.web.ErrorProperties;
import org.springframework.boot.autoconfigure.web.ResourceProperties;
import org.springframework.boot.autoconfigure.web.reactive.error.DefaultErrorWebExceptionHandler;
import org.springframework.boot.web.reactive.error.ErrorAttributes;
import org.springframework.context.ApplicationContext;
import org.springframework.http.HttpStatus;
import org.springframework.web.reactive.function.server.*;
import java.util.HashMap;
import java.util.Map;
/**
* @description: 捕獲及處理異常
* @Author:
* @Date: 2020/2/15 9:46
*/
public class JsonExceptionHandler extends DefaultErrorWebExceptionHandler {
public JsonExceptionHandler(ErrorAttributes errorAttributes, ResourceProperties resourceProperties,
ErrorProperties errorProperties, ApplicationContext applicationContext) {
super(errorAttributes, resourceProperties, errorProperties, applicationContext);
}
/**
* 獲取異常屬性
*/
@Override
protected Map<String, Object> getErrorAttributes(ServerRequest request, boolean includeStackTrace) {
int code = 500;
Throwable error = super.getError(request);
if (error instanceof org.springframework.cloud.gateway.support.NotFoundException) {
code = 404;
}
return response(code, this.buildMessage(request, error));
}
/**
* 指定響應處理方法爲JSON處理的方法
* @param errorAttributes
*/
@Override
protected RouterFunction<ServerResponse> getRoutingFunction(ErrorAttributes errorAttributes) {
return RouterFunctions.route(RequestPredicates.all(), this::renderErrorResponse);
}
/**
* 根據code獲取對應的HttpStatus
* @param errorAttributes
*/
@Override
protected HttpStatus getHttpStatus(Map<String, Object> errorAttributes) {
int statusCode = (int) errorAttributes.get("code");
return HttpStatus.valueOf(statusCode);
}
/**
* 構建異常信息
* @param request
* @param ex
* @return
*/
private String buildMessage(ServerRequest request, Throwable ex) {
StringBuilder message = new StringBuilder("Failed to handle request [");
message.append(request.methodName());
message.append(" ");
message.append(request.uri());
message.append("]");
if (ex != null) {
message.append(": ");
message.append(ex.getMessage());
}
return message.toString();
}
/**
* 構建返回的JSON數據格式
* @param status 狀態碼
* @param errorMessage 異常信息
* @return
*/
public static Map<String, Object> response(int status, String errorMessage) {
Map<String, Object> map = new HashMap<>(3);
map.put("code", status);
map.put("message", errorMessage);
map.put("data", null);
return map;
}
}
config類代碼:
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.boot.autoconfigure.web.ResourceProperties;
import org.springframework.boot.autoconfigure.web.ServerProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.boot.web.reactive.error.ErrorAttributes;
import org.springframework.boot.web.reactive.error.ErrorWebExceptionHandler;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.http.codec.ServerCodecConfigurer;
import org.springframework.web.reactive.result.view.ViewResolver;
import java.util.Collections;
import java.util.List;
/**
* @description: 異常的配置
* @Author:
* @Date: 2020/2/15 9:44
*/
@Configuration
@EnableConfigurationProperties({ServerProperties.class, ResourceProperties.class})
public class ExceptionConfig {
private final ServerProperties serverProperties;
private final ApplicationContext applicationContext;
private final ResourceProperties resourceProperties;
private final List<ViewResolver> viewResolvers;
private final ServerCodecConfigurer serverCodecConfigurer;
public ExceptionConfig(ServerProperties serverProperties,
ResourceProperties resourceProperties,
ObjectProvider<List<ViewResolver>> viewResolversProvider,
ServerCodecConfigurer serverCodecConfigurer,
ApplicationContext applicationContext) {
this.serverProperties = serverProperties;
this.applicationContext = applicationContext;
this.resourceProperties = resourceProperties;
this.viewResolvers = viewResolversProvider.getIfAvailable(Collections::emptyList);
this.serverCodecConfigurer = serverCodecConfigurer;
}
@Bean
@Order(Ordered.HIGHEST_PRECEDENCE)
public ErrorWebExceptionHandler errorWebExceptionHandler(ErrorAttributes errorAttributes) {
JsonExceptionHandler exceptionHandler = new JsonExceptionHandler(
errorAttributes,
this.resourceProperties,
this.serverProperties.getError(),
this.applicationContext);
exceptionHandler.setViewResolvers(this.viewResolvers);
exceptionHandler.setMessageWriters(this.serverCodecConfigurer.getWriters());
exceptionHandler.setMessageReaders(this.serverCodecConfigurer.getReaders());
return exceptionHandler;
}
}
pom文件中的內容:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-gateway</artifactId>
</dependency>
我這裏的springboot版本是2.1.12RELEASE,springcloud版本是Greenwich.SR5。
配置好之後,返回請求未啓動的api服務時,返回截圖: