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java压缩解压缩

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文章字数：268,阅读全文大约需要1分钟

封装了两个小功能，传入文件输出流，压缩一个/多个文件到压缩文件。传入压缩文件地址和解压缩的文件夹，解压（文件夹会被覆盖）

例子

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/**
 * @author colin.cheng
 * @date 
 */

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

public class zipTest {

    /**
     * 压缩文件
     *
     * @param inputStream
     *            读取的文件流
     * @param outputStream
     *            输出的压缩文件流
     * @param fileName
     *            压缩进去的文件名
     * @throws Exception
     */
    private static void zipFile(FileInputStream inputStream, ZipOutputStream outputStream, String fileName)
        throws Exception {
        // 新建一个压缩条目（相对路径）
        outputStream.putNextEntry(new ZipEntry(fileName));
        // 写入这个条目
        try (BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream, 512)) {
            int index;
            byte[] buffer = new byte[512];
            while ((index = bufferedInputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, index);
            }
        }
        // 关闭条目，并等待下个条目
        outputStream.closeEntry();
    }

    /**
     * 创建文件父级目录
     * 
     * @param file
     */
    public static void createParentPath(File file) {
        File parentFile = file.getParentFile();
        if (null != parentFile && !parentFile.exists()) {
            parentFile.mkdirs(); // 创建文件夹
            createParentPath(parentFile); // 递归创建父级目录
        }
    }

    /**
     * 解压缩
     * 
     * @param fromZip
     *            目标压缩文件
     * @param toPath
     *            解压地址（存在则覆盖此目录）
     * @throws Exception
     */
    public static void decompressionFile(String fromZip, String toPath) throws Exception {
        File baseFile = new File(toPath);
        if (baseFile.exists()) {
            baseFile.delete();
        }
        File zipFile = new File(fromZip);
        ZipInputStream inputStream = new ZipInputStream(new BufferedInputStream(new FileInputStream(zipFile), 255));
        ZipEntry entry;
        int length;
        byte[] buffer = new byte[255];
        while ((entry = inputStream.getNextEntry()) != null) {
            String filePath = baseFile.toPath().toString() + "\\" + entry.getName();
            createParentPath(new File(filePath));
            Files.createFile(Paths.get(filePath));
            FileOutputStream outputStream = new FileOutputStream(Paths.get(filePath).toFile());
            while ((length = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, length);
            }
        }
    }

    public static void main(String[] args) {
        try {
            // 压缩测试
            // 压缩包名字
            String zipPathStr =
                "F:\\cache\\test.zip";
            try (ZipOutputStream zipOutputStream = new ZipOutputStream(new FileOutputStream(new File(zipPathStr)))) {
                // 模拟压缩三份文件进去
                for (int i = 0; i < 3; i++) {
                    String filePathStr =
                        "F:\\cache\\test.xls";
                    File file = new File(filePathStr);
                    try (FileInputStream fileInputStream = new FileInputStream(file)) {
                        // all/1test.xls all为指定的目录
                        zipFile(fileInputStream, zipOutputStream, "all/" + i + file.getName());
                    }
                }
            }

            // 解压测试
            decompressionFile(
                "F:\\cache\\test.zip",
                "F:\\cache\\test");
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}