java对zip、rar、7z文件带密码解压实例

在一些日常业务中,会遇到一些琐碎文件需要统一打包到一个压缩包中上传,业务方在后台接收到压缩包后自行解压,然后解析相应文件。而且可能涉及安全保密,因此会在压缩时带上密码,要求后台业务可以指定密码进行解压。

应用环境说明:jdk1.8,maven3.x,需要基于java语言实现对zip、rar、7z等常见压缩包的解压工作。

首先关于zip和rar、7z等压缩工具和压缩算法就不在此赘述,下面通过一个数据对比,使用上述三种不同的压缩算法,采用默认的压缩方式,看到压缩的文件大小如下:

java对zip、rar、7z文件带密码解压实例_第1张图片

转换成图表看得更直观,如下图:

java对zip、rar、7z文件带密码解压实例_第2张图片

从以上图表可以看到,7z的压缩率是最高,而zip压缩率比较低,rar比zip稍微好点。单纯从压缩率看,7z>rar4>rar5>zip。

下面具体说明在java中如何进行相应解压:

1、pom.xml


	4.0.0
	com.yelang
	7zdemo
	0.0.1-SNAPSHOT

	
		
			net.lingala.zip4j
			zip4j
			2.9.0
		

		
			net.sf.sevenzipjbinding
			sevenzipjbinding
			16.02-2.01
		
		
			net.sf.sevenzipjbinding
			sevenzipjbinding-all-platforms
			16.02-2.01
		

		
			org.tukaani
			xz
			1.9
		
		
			org.apache.commons
			commons-compress
			1.21
		
		
		
		
		    org.slf4j
		    slf4j-api
		    1.7.30
		
		
		
		
		    org.apache.commons
		    commons-lang3
		    3.12.0
		
		
		
		
		    fr.opensagres.xdocreport
		    xdocreport
		    1.0.6
		
		
	

主要依赖的jar包有:zip4j、sevenzipjbinding等。

2、zip解压

 @SuppressWarnings("resource")
private static String unZip(String rootPath, String sourceRarPath, String destDirPath, String passWord) {
        ZipFile zipFile = null;
        String result = "";
        try {
        	//String filePath = sourceRarPath;
        	String filePath = rootPath + sourceRarPath;
            if (StringUtils.isNotBlank(passWord)) {
                zipFile = new ZipFile(filePath, passWord.toCharArray());
            } else {
                zipFile = new ZipFile(filePath);
            }
            zipFile.setCharset(Charset.forName("GBK"));
            zipFile.extractAll(rootPath + destDirPath);
        } catch (Exception e) {
            log.error("unZip error", e);
            return e.getMessage();
        }
        return result;
    }

3、rar解压

private static String unRar(String rootPath, String sourceRarPath, String destDirPath, String passWord) {
        String rarDir = rootPath + sourceRarPath;
        String outDir = rootPath + destDirPath + File.separator;
        RandomAccessFile randomAccessFile = null;
        IInArchive inArchive = null;
        try {
            // 第一个参数是需要解压的压缩包路径,第二个参数参考JdkAPI文档的RandomAccessFile
            randomAccessFile = new RandomAccessFile(rarDir, "r");
            if (StringUtils.isNotBlank(passWord))
                inArchive = SevenZip.openInArchive(null, new RandomAccessFileInStream(randomAccessFile), passWord);
            else
                inArchive = SevenZip.openInArchive(null, new RandomAccessFileInStream(randomAccessFile));
 
            ISimpleInArchive simpleInArchive = inArchive.getSimpleInterface();
            for (final ISimpleInArchiveItem item : simpleInArchive.getArchiveItems()) {
                final int[] hash = new int[]{0};
                if (!item.isFolder()) {
                    ExtractOperationResult result;
                    final long[] sizeArray = new long[1];
 
                    File outFile = new File(outDir + item.getPath());
                    File parent = outFile.getParentFile();
                    if ((!parent.exists()) && (!parent.mkdirs())) {
                        continue;
                    }
                    if (StringUtils.isNotBlank(passWord)) {
                        result = item.extractSlow(data -> {
                            try {
                                IOUtils.write(data, new FileOutputStream(outFile, true));
                            } catch (Exception e) {
                                e.printStackTrace();
                            }
                            hash[0] ^= Arrays.hashCode(data); // Consume data
                            sizeArray[0] += data.length;
                            return data.length; // Return amount of consumed
                        }, passWord);
                    } else {
                        result = item.extractSlow(data -> {
                            try {
                                IOUtils.write(data, new FileOutputStream(outFile, true));
                            } catch (Exception e) {
                                e.printStackTrace();
                            }
                            hash[0] ^= Arrays.hashCode(data); // Consume data
                            sizeArray[0] += data.length;
                            return data.length; // Return amount of consumed
                        });
                    }
                    
                    if (result == ExtractOperationResult.OK) {
                        log.error("解压rar成功...." + String.format("%9X | %10s | %s", hash[0], sizeArray[0], item.getPath()));
                    } else if (StringUtils.isNotBlank(passWord)) {
                        log.error("解压rar成功:密码错误或者其他错误...." + result);
                        return "password";
                    } else {
                        return "rar error";
                    }
                }
            }
 
        } catch (Exception e) {
            log.error("unRar error", e);
            return e.getMessage();
        } finally {
            try {
                inArchive.close();
                randomAccessFile.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return "";
    }

4、7z解压

 private static String un7z(String rootPath, String sourceRarPath, String destDirPath, String passWord) {
        try {
            File srcFile = new File(rootPath + sourceRarPath);//获取当前压缩文件
            // 判断源文件是否存在
            if (!srcFile.exists()) {
                throw new Exception(srcFile.getPath() + "所指文件不存在");
            }
            //开始解压
            SevenZFile zIn = null;
            if (StringUtils.isNotBlank(passWord)) {
            	zIn = new SevenZFile(srcFile, passWord.toCharArray());
            }  else {
            	zIn = new SevenZFile(srcFile);
            }
 
            SevenZArchiveEntry entry = null;
            File file = null;
            while ((entry = zIn.getNextEntry()) != null) {
                if (!entry.isDirectory()) {
                    file = new File(rootPath + destDirPath, entry.getName());
                    if (!file.exists()) {
                        new File(file.getParent()).mkdirs();//创建此文件的上级目录
                    }
                    OutputStream out = new FileOutputStream(file);
                    BufferedOutputStream bos = new BufferedOutputStream(out);
                    int len = -1;
                    byte[] buf = new byte[1024];
                    while ((len = zIn.read(buf)) != -1) {
                        bos.write(buf, 0, len);
                    }
                    // 关流顺序,先打开的后关闭
                    bos.close();
                    out.close();
                }
            }
 
        } catch (Exception e) {
            log.error("un7z is error", e);
            return e.getMessage();
        }
        return "";
    }

5、解压统一入口封装

public static Map unFile(String rootPath, String sourcePath, String destDirPath, String passWord) {
    	Map resultMap = new HashMap();
    	String result = "";
        if (sourcePath.toLowerCase().endsWith(".zip")) {
            //Wrong password!
            result = unZip(rootPath, sourcePath, destDirPath, passWord);
        } else if (sourcePath.toLowerCase().endsWith(".rar")) {
            //java.security.InvalidAlgorithmParameterException: password should be specified
            result = unRar(rootPath, sourcePath, destDirPath, passWord);
            System.out.println(result);
        } else if (sourcePath.toLowerCase().endsWith(".7z")) {
            //PasswordRequiredException: Cannot read encrypted content from G:\ziptest\11111111.7z without a password
            result = un7z(rootPath, sourcePath, destDirPath, passWord);
        }
     
        resultMap.put("resultMsg", 1);
        if (StringUtils.isNotBlank(result)) {
            if (result.contains("password")) resultMap.put("resultMsg", 2);
            if (!result.contains("password")) resultMap.put("resultMsg", 3);
        }
        resultMap.put("files", null);
        //System.out.println(result + "==============");
        return resultMap;
    }

6、测试代码

Long start = System.currentTimeMillis();
unFile("D:/rarfetch0628/","apache-tomcat-8.5.69.zip","apache-tomcat-zip","222");
long end = System.currentTimeMillis();
System.out.println("zip解压耗时==" + (end - start) + "毫秒");
System.out.println("============================================================");
    	
Long rar4start = System.currentTimeMillis();
unFile("D:/rarfetch0628/","apache-tomcat-8.5.69-4.rar","apache-tomcat-rar4","222");
long rar4end = System.currentTimeMillis();
System.out.println("rar4解压耗时==" + (rar4end - rar4start)+ "毫秒");
System.out.println("============================================================");
    	
Long rar5start = System.currentTimeMillis();
unFile("D:/rarfetch0628/","apache-tomcat-8.5.69-5.rar","apache-tomcat-rar5","222");
long rar5end = System.currentTimeMillis();
System.out.println("rar5解压耗时==" + (rar5end - rar5start)+ "毫秒");
System.out.println("============================================================");
    	
Long zstart = System.currentTimeMillis();
unFile("D:/rarfetch0628/","apache-tomcat-8.5.69.7z","apache-tomcat-7z","222");
long zend = System.currentTimeMillis();
System.out.println("7z解压耗时==" + (zend - zstart)+ "毫秒");
System.out.println("============================================================");

在控制台中可以看到以下结果:

java对zip、rar、7z文件带密码解压实例_第3张图片

java对zip、rar、7z文件带密码解压实例_第4张图片

总结:本文采用java语言实现了对zip和rar、7z文件的解压统一算法。并对比了相应的解压速度,支持传入密码进行在线解压。本文参考了:https://blog.csdn.net/luanwuqingyang/article/details/121114113,不过博主的文章代码直接运行有问题,这里进行了调整,主要优化的点如下:

1、pom.xml 遗漏了slf4j、commons-lang3、xdocreport等依赖

2、zip路径优化

3、去掉一些无用信息

4、优化异常信息

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