spring Content 源码
springboot Content 代码
文件路径:/spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/io/Content.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.buildpack.platform.io;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;
import org.springframework.util.Assert;
import org.springframework.util.FileCopyUtils;
/**
* Content with a known size that can be written to an {@link OutputStream}.
*
* @author Phillip Webb
* @since 2.3.0
*/
public interface Content {
/**
* The size of the content in bytes.
* @return the content size
*/
int size();
/**
* Write the content to the given output stream.
* @param outputStream the output stream to write to
* @throws IOException on IO error
*/
void writeTo(OutputStream outputStream) throws IOException;
/**
* Create a new {@link Content} from the given UTF-8 string.
* @param string the string to write
* @return a new {@link Content} instance
*/
static Content of(String string) {
Assert.notNull(string, "String must not be null");
return of(string.getBytes(StandardCharsets.UTF_8));
}
/**
* Create a new {@link Content} from the given input stream.
* @param bytes the bytes to write
* @return a new {@link Content} instance
*/
static Content of(byte[] bytes) {
Assert.notNull(bytes, "Bytes must not be null");
return of(bytes.length, () -> new ByteArrayInputStream(bytes));
}
/**
* Create a new {@link Content} from the given file.
* @param file the file to write
* @return a new {@link Content} instance
*/
static Content of(File file) {
Assert.notNull(file, "File must not be null");
return of((int) file.length(), () -> new FileInputStream(file));
}
/**
* Create a new {@link Content} from the given input stream. The stream will be closed
* after it has been written.
* @param size the size of the supplied input stream
* @param supplier the input stream supplier
* @return a new {@link Content} instance
*/
static Content of(int size, IOSupplier<InputStream> supplier) {
Assert.isTrue(size >= 0, "Size must not be negative");
Assert.notNull(supplier, "Supplier must not be null");
return new Content() {
@Override
public int size() {
return size;
}
@Override
public void writeTo(OutputStream outputStream) throws IOException {
FileCopyUtils.copy(supplier.get(), outputStream);
}
};
}
}
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- 本文标签: Spring Boot Java Spring
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