spring JspTemplateAvailabilityProvider 源码
springboot JspTemplateAvailabilityProvider 代码
文件路径：/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/servlet/JspTemplateAvailabilityProvider.java
/*
* Copyright 2012-2021 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.boot.autoconfigure.web.servlet;
import java.io.File;
import org.springframework.boot.autoconfigure.template.TemplateAvailabilityProvider;
import org.springframework.core.env.Environment;
import org.springframework.core.io.ResourceLoader;
import org.springframework.util.ClassUtils;
/**
* {@link TemplateAvailabilityProvider} that provides availability information for JSP
* view templates.
*
* @author Andy Wilkinson
* @author Stephane Nicoll
* @author Madhura Bhave
* @since 2.0.0
*/
public class JspTemplateAvailabilityProvider implements TemplateAvailabilityProvider {
@Override
public boolean isTemplateAvailable(String view, Environment environment, ClassLoader classLoader,
ResourceLoader resourceLoader) {
if (ClassUtils.isPresent("org.apache.jasper.compiler.JspConfig", classLoader)) {
String resourceName = getResourceName(view, environment);
if (resourceLoader.getResource(resourceName).exists()) {
return true;
}
return new File("src/main/webapp", resourceName).exists();
}
return false;
}
private String getResourceName(String view, Environment environment) {
String prefix = environment.getProperty("spring.mvc.view.prefix", WebMvcAutoConfiguration.DEFAULT_PREFIX);
String suffix = environment.getProperty("spring.mvc.view.suffix", WebMvcAutoConfiguration.DEFAULT_SUFFIX);
return prefix + view + suffix;
}
}
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- 本文标签： Java Spring Spring Boot
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