spring StringToFileConverter 源码
springboot StringToFileConverter 代码
文件路径：/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/convert/StringToFileConverter.java
/*
* Copyright 2012-2020 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.boot.convert;
import java.io.File;
import java.io.IOException;
import org.springframework.core.convert.converter.Converter;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.util.ResourceUtils;
/**
* {@link Converter} to convert from a {@link String} to a {@link File}. Supports basic
* file conversion as well as file URLs.
*
* @author Phillip Webb
*/
class StringToFileConverter implements Converter<String, File> {
private static final ResourceLoader resourceLoader = new DefaultResourceLoader(null);
@Override
public File convert(String source) {
if (ResourceUtils.isUrl(source)) {
return getFile(resourceLoader.getResource(source));
}
File file = new File(source);
if (file.exists()) {
return file;
}
Resource resource = resourceLoader.getResource(source);
if (resource.exists()) {
return getFile(resource);
}
return file;
}
private File getFile(Resource resource) {
try {
return resource.getFile();
}
catch (IOException ex) {
throw new IllegalStateException("Could not retrieve file for " + resource + ": " + ex.getMessage());
}
}
}
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- 本文标签： Java Spring Spring Boot
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