com.github.qq275860560.common.util.FileUtil Maven / Gradle / Ivy

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package com.github.qq275860560.common.util;

import java.io.File;
import java.io.InputStream;
import java.net.URL;
import java.util.Collection;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.core.io.ClassPathResource;

/**
 * @author [email protected]
 */
public class FileUtil {
	private static Log log = LogFactory.getLog(FileUtil.class);

	private FileUtil() {
	}

	public static File getFileFromClassPath(String path) throws Exception {
		ClassPathResource resource = new ClassPathResource(path);
		File destination = new File(FileUtils.getTempDirectoryPath() + "/" + path);

		// if(!destination.exists()){
		FileUtils.copyInputStreamToFile(resource.getInputStream(), destination);
		// }
		return destination;
		// return new ClassPathResource(path).getFile();
		// return new File(Thread.class.getResource("path").getFile());
	}

	// 复制文件

	public static void copyFile(File srcFile, File destFile) throws Exception {
		org.apache.commons.io.FileUtils.copyFile(srcFile, destFile);
	}

	// 复制文件到目标文件夹

	public static void copyFileToDirectory(File srcFile, File destDir) throws Exception {
		org.apache.commons.io.FileUtils.copyFileToDirectory(srcFile, destDir);
	}

	// 读取文件

	public static List readLines(File file, String encoding) throws Exception {
		return org.apache.commons.io.FileUtils.readLines(file, encoding);
	}

	// 写入文件
	public static void writeLines(File file, String encoding, Collection lines) throws Exception {
		org.apache.commons.io.FileUtils.writeLines(file, encoding, lines);
	}

	// 写入文件

	public static void writeStringToFile(File file, String data, String encoding) throws Exception {
		org.apache.commons.io.FileUtils.writeStringToFile(file, data, encoding);
	}

	// 网络流拷贝文件

	public static void copyURLToFile(URL source, File destination) throws Exception {
		org.apache.commons.io.FileUtils.copyURLToFile(source, destination);
	}

	// 获取前缀

	public static String getPrefix(String filename) {
		return org.apache.commons.io.FilenameUtils.getPrefix(filename);
	}

	// 获取后缀

	public static String getExtension(File file) {
		return org.apache.commons.io.FilenameUtils.getExtension(file.getAbsolutePath()).toLowerCase();
	}

	// 从输入流中读取制定起始位置和长度的字节

	public static byte[] getFileContentByte(InputStream inputStream, long offset, long length) throws Exception {
		log.debug("getFileContentByte start");
		byte[] fileContent = null;
		byte[] tempBuf = new byte[(int) length];

		inputStream.skip(offset);
		int readLen = inputStream.read(tempBuf);
		if (readLen < 0) {
			fileContent = new byte[0];
			return fileContent;
		}
		if (readLen < length) {
			fileContent = new byte[readLen];
			System.arraycopy(tempBuf, 0, fileContent, 0, readLen);
		} else {
			fileContent = tempBuf;
		}
		inputStream.close();
		return fileContent;
	}

}