Apache在Commons Compress简介和简单应用
发布时间:2020-12-15 00:11:19 所属栏目:Java 来源:网络整理
导读:今天PHP站长网 52php.cn把收集自互联网的代码分享给大家,仅供参考。 Java代码 //GzipCompressorInputStream CompressorInputStream gzipIn = newCompressorStreamFactory() .createCompressorInputStream("gz",is); // G
以下代码由PHP站长网 52php.cn收集自互联网 现在PHP站长网小编把它分享给大家,仅供参考 Java代码 //GzipCompressorInputStream CompressorInputStream gzipIn = newCompressorStreamFactory() .createCompressorInputStream("gz",is); // GzipCompressorOutputStream CompressorOutputStream gzipOut = newCompressorStreamFactory() .createCompressorOutputStream("gz",os); BZip2 Java代码 // BZip2CompressorInputStream CompressorInputStream bzip2In =new CompressorStreamFactory() .createCompressorInputStream("bzip2",is); //BZip2CompressorOutputStream CompressorOutputStream bzip2Out= new CompressorStreamFactory() .createCompressorOutputStream("bzip2",os); 下面是一个完整的通过apachecommons compress简单实现bzip2压缩的样例。 需要导入的包为:commons-compress-1.9.jar packagetest.ffm83.commons.compress; importjava.io.ByteArrayInputStream; importjava.io.ByteArrayOutputStream; importjava.io.File; importjava.io.FileInputStream; importjava.io.FileOutputStream; importjava.io.InputStream; importjava.io.OutputStream; importorg.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream; importorg.apache.commons.compress.compressors.bzip2.BZip2CompressorOutputStream; /* 通过apache commons compress简单实现bzip2压缩 * 部分代码来自互联网 * @author 范芳铭 * */ publicclass BZip2Utils { public static final int BUFFER = 1024; public static final CharSequence EXT =".bz2"; /** * 数据压缩 * * @param data * @return * @throws Exception */ public static byte[] compress(byte[] data)throws Exception { ByteArrayInputStream bais = newByteArrayInputStream(data); ByteArrayOutputStream baos = newByteArrayOutputStream(); // 压缩 compress(bais,baos); byte[] output =baos.toByteArray(); baos.flush(); baos.close(); bais.close(); return output; } /** * 文件压缩 * * @param file * @param delete * 是否删除原始文件 * @throws Exception */ public static void compress(File file,boolean delete) throws Exception { FileInputStream fis = newFileInputStream(file); FileOutputStream fos = newFileOutputStream(file.getPath() + EXT); compress(fis,fos); fis.close(); fos.flush(); fos.close(); if (delete) { file.delete(); } } /** * 数据压缩 * * @param is * @param os * @throws Exception */ public static void compress(InputStream is,OutputStream os) throws Exception { BZip2CompressorOutputStream gos = newBZip2CompressorOutputStream(os); int count; byte data[] = new byte[BUFFER]; while ((count = is.read(data,BUFFER)) !=-1) { gos.write(data,count); } gos.finish(); gos.flush(); gos.close(); } /** * 文件压缩 * * @param path * @param delete * 是否删除原始文件 * @throws Exception */ public static void compress(String path,boolean delete) throws Exception { File file = new File(path); compress(file,delete); } /** * 数据解压缩 * * @param data * @return * @throws Exception */ public static byte[] decompress(byte[]data) throws Exception { ByteArrayInputStream bais = newByteArrayInputStream(data); ByteArrayOutputStream baos = newByteArrayOutputStream(); // 解压缩 decompress(bais,baos); data = baos.toByteArray(); baos.flush(); baos.close(); bais.close(); return data; } /** * 文件解压缩 * * @param file * @param delete * 是否删除原始文件 * @throws Exception */ public static void decompress(File file,boolean delete) throws Exception { FileInputStream fis = newFileInputStream(file); FileOutputStream fos = newFileOutputStream(file.getPath().replace(EXT,"")); decompress(fis,fos); fis.close(); fos.flush(); fos.close(); if (delete) { file.delete(); } } /** * 数据解压缩 * * @param is * @param os * @throws Exception */ public static void decompress(InputStreamis,OutputStream os) throws Exception { BZip2CompressorInputStream gis = newBZip2CompressorInputStream(is); int count; byte data[] = new byte[BUFFER]; while ((count = gis.read(data,BUFFER)) != -1) { os.write(data,count); } gis.close(); } /** * 文件解压缩 * * @param path * @param delete * 是否删除原始文件 * @throws Exception */ public static void decompress(String path,boolean delete) throws Exception { File file = new File(path); decompress(file,delete); } public static void main(String[] args)throws Exception{ StringinputStr = "http://blog.csdn.net/ffm83/article/details/42240513"; byte[]input = inputStr.getBytes(); System.out.println("原文:t" + inputStr); System.out.println("长度:t" + input.length); byte[] data = compress(input); System.err.println("压缩后:t"); System.err.println("长度:t" + data.length); byte[] output = decompress(data); String outputStr = newString(output); System.err.println("解压缩后:t" + outputStr); System.err.println("长度:t" + output.length); } } 以上内容由PHP站长网【52php.cn】收集整理供大家参考研究 如果以上内容对您有帮助,欢迎收藏、点赞、推荐、分享。 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |