spring ConversionServiceExposingInterceptor 源码
spring ConversionServiceExposingInterceptor 代码
文件路径：/spring-webmvc/src/main/java/org/springframework/web/servlet/handler/ConversionServiceExposingInterceptor.java
/*
* Copyright 2002-2020 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.io.IOException;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.core.convert.ConversionService;
import org.springframework.util.Assert;
import org.springframework.web.servlet.HandlerInterceptor;
/**
* Interceptor that places the configured {@link ConversionService} in request scope
* so it's available during request processing. The request attribute name is
* "org.springframework.core.convert.ConversionService", the value of
* {@code ConversionService.class.getName()}.
*
* <p>Mainly for use within JSP tags such as the spring:eval tag.
*
* @author Keith Donald
* @since 3.0.1
*/
public class ConversionServiceExposingInterceptor implements HandlerInterceptor {
private final ConversionService conversionService;
/**
* Creates a new {@link ConversionServiceExposingInterceptor}.
* @param conversionService the conversion service to export to request scope when this interceptor is invoked
*/
public ConversionServiceExposingInterceptor(ConversionService conversionService) {
Assert.notNull(conversionService, "The ConversionService may not be null");
this.conversionService = conversionService;
}
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws ServletException, IOException {
request.setAttribute(ConversionService.class.getName(), this.conversionService);
return true;
}
}
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