spring HandlerExceptionResolverComposite 源码
spring HandlerExceptionResolverComposite 代码
文件路径：/spring-webmvc/src/main/java/org/springframework/web/servlet/handler/HandlerExceptionResolverComposite.java
/*
* Copyright 2002-2019 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.web.servlet.handler;
import java.util.Collections;
import java.util.List;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.core.Ordered;
import org.springframework.lang.Nullable;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;
/**
* A {@link HandlerExceptionResolver} that delegates to a list of other
* {@link HandlerExceptionResolver HandlerExceptionResolvers}.
*
* @author Rossen Stoyanchev
* @since 3.1
*/
public class HandlerExceptionResolverComposite implements HandlerExceptionResolver, Ordered {
@Nullable
private List<HandlerExceptionResolver> resolvers;
private int order = Ordered.LOWEST_PRECEDENCE;
/**
* Set the list of exception resolvers to delegate to.
*/
public void setExceptionResolvers(List<HandlerExceptionResolver> exceptionResolvers) {
this.resolvers = exceptionResolvers;
}
/**
* Return the list of exception resolvers to delegate to.
*/
public List<HandlerExceptionResolver> getExceptionResolvers() {
return (this.resolvers != null ? Collections.unmodifiableList(this.resolvers) : Collections.emptyList());
}
public void setOrder(int order) {
this.order = order;
}
@Override
public int getOrder() {
return this.order;
}
/**
* Resolve the exception by iterating over the list of configured exception resolvers.
* <p>The first one to return a {@link ModelAndView} wins. Otherwise {@code null} is returned.
*/
@Override
@Nullable
public ModelAndView resolveException(
HttpServletRequest request, HttpServletResponse response, @Nullable Object handler, Exception ex) {
if (this.resolvers != null) {
for (HandlerExceptionResolver handlerExceptionResolver : this.resolvers) {
ModelAndView mav = handlerExceptionResolver.resolveException(request, response, handler, ex);
if (mav != null) {
return mav;
}
}
}
return null;
}
}
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