Java实现文件压缩为zip和解压zip压缩包

public static void toZip(String srcDir, OutputStream out) throws RuntimeException {

    long start = System.currentTimeMillis();

    ZipOutputStream zos = null;

    try {

        zos = new ZipOutputStream(out);

        File sourceFile = new File(srcDir);

        compress(sourceFile, zos, sourceFile.getName(), false);

        long end = System.currentTimeMillis();

        System.out.println("压缩完成，耗时：" + (end - start) + " ms");

    } catch (Exception e) {

        throw new RuntimeException("zip error from ZipUtils", e);

    } finally {

        if (zos != null) {

            try {

                zos.close();

            } catch (IOException e) {

                e.printStackTrace();

            }

        }

    }
}


private static void compress(File sourceFile, ZipOutputStream zos, String name,
                             boolean KeepDirStructure) throws Exception {
    byte[] buf = new byte[BUFFER_SIZE];

    if (sourceFile.isFile()) {

        // 向zip输出流中添加一个zip实体，构造器中name为zip实体的文件的名字

        zos.putNextEntry(new ZipEntry(name));

        // copy文件到zip输出流中

        int len;

        FileInputStream in = new FileInputStream(sourceFile);

        while ((len = in.read(buf)) != -1) {

            zos.write(buf, 0, len);

        }

        // Complete the entry

        zos.closeEntry();

        in.close();

    } else {

        File[] listFiles = sourceFile.listFiles();

        if (listFiles == null || listFiles.length == 0) {

            // 需要保留原来的文件结构时,需要对空文件夹进行处理

            if (KeepDirStructure) {

                // 空文件夹的处理

                zos.putNextEntry(new ZipEntry(name + "/"));

                // 没有文件，不需要文件的copy

                zos.closeEntry();
            }

        } else {

            for (File file : listFiles) {

                // 判断是否需要保留原来的文件结构

                if (KeepDirStructure) {

                    // 注意：file.getName()前面需要带上父文件夹的名字加一斜杠,

                    // 不然最后压缩包中就不能保留原来的文件结构,即：所有文件都跑到压缩包根目录下了

                    compress(file, zos, name + "/" + file.getName(), KeepDirStructure);

                } else {

                    compress(file, zos, file.getName(), KeepDirStructure);

                }


            }

        }

    }

}

@Test
public void test() throws Exception {
    //Navicat路径
    String inDir = "E:\\developer\\Navicat";
    //打包后输出路径
    String outDir = "E:\\developer\\NavicatZip\\Navicat.zip";
    OutputStream fileOutputStream = new FileOutputStream(new File(outDir));
    ZipUtils.toZip(inDir, fileOutputStream);
}

public static void readZip(String fileZip,String path_to_dest) throws IOException {

    try (FileInputStream fis = new FileInputStream(fileZip);
         ZipInputStream zis =
         new ZipInputStream(new BufferedInputStream(fis))) {

        ZipEntry entry;

        // 从ZipInputStream读取每个条目，直到没有
        // 发现更多条目，返回值为空
        // getNextEntry()方法。
        while ((entry = zis.getNextEntry()) != null) {
            System.out.println("Unzipping: " + entry.getName());

            int size;
            byte[] buffer = new byte[2048];
            File fileOut = new File(path_to_dest+"\\"+entry.getName());
            try (FileOutputStream fos =
                 new FileOutputStream(fileOut);
                 BufferedOutputStream bos =
                 new BufferedOutputStream(fos, buffer.length)) {

                while ((size = zis.read(buffer, 0, buffer.length)) != -1) {
                    bos.write(buffer, 0, size);
                }
                bos.flush();
            }
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}

@Test
public void readZip() throws Exception {
    //解压后路径
    String path_to_dest = "E:\\developer\\NavicatUnzip";
    //zip文件路径
    String fileZip = "E:\\developer\\NavicatZip\\Navicat.zip";
    ZipUtils.readZip(fileZip, path_to_dest);
}