如何在 Java 中创建一个 zip 文件

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【中文标题】如何在 Java 中创建一个 zip 文件【英文标题】:How to create a zip file in Java 【发布时间】:2010-11-08 16:08:47 【问题描述】:

我有一个动态文本文件,它根据用户的查询从数据库中挑选内容。我必须将此内容写入文本文件并将其压缩到 servlet 的文件夹中。我该怎么做?

【问题讨论】:

【参考方案1】:

我知道这个问题已经得到解答,但如果你有一个字符串列表,并且你想为存档中的每个字符串创建一个单独的文件,你可以使用下面的 sn-p。

public void zipFileTest() throws IOException 

    Map<String, String> map = Map.ofEntries(
            new AbstractMap.SimpleEntry<String, String>("File1.txt", "File1 Content"),
            new AbstractMap.SimpleEntry<String, String>("File2.txt", "File2 Content"),
            new AbstractMap.SimpleEntry<String, String>("File3.txt", "File3 Content")
    );

    createZipFileFromStringContents(map, "archive.zip");



public void createZipFileFromStringContents(Map<String, String> map, String zipfilePath) throws IOException 

    FileOutputStream fout = new FileOutputStream(zipfilePath);
    ZipOutputStream zout = new ZipOutputStream(fout);

    for (Map.Entry<String, String> entry : map.entrySet()) 
        String fileName = entry.getKey();
        ZipEntry zipFile = new ZipEntry(fileName);
        zout.putNextEntry(zipFile);
        String fileContent = entry.getValue();
        zout.write(fileContent.getBytes(), 0, fileContent.getBytes().length);
        zout.closeEntry();
    

    zout.close();

它将创建一个结构如下图所示的 zip 文件:

【讨论】:

【参考方案2】:

在https://github.com/srikanth-lingala/zip4j 处使用zip4j 还有另一种选择

创建一个包含单个文件的 zip 文件/将单个文件添加到现有 zip 中

new ZipFile("filename.zip").addFile("filename.ext"); 或者

new ZipFile("filename.zip").addFile(new File("filename.ext"));

创建包含多个文件的 zip 文件 / 将多个文件添加到现有 zip 中

new ZipFile("filename.zip").addFiles(Arrays.asList(new File("first_file"), new File("second_file")));

通过向其添加文件夹/向现有 zip 添加文件夹来创建 zip 文件

new ZipFile("filename.zip").addFolder(new File("/user/myuser/folder_to_add"));

从流创建 zip 文件/将流添加到现有 zip new ZipFile("filename.zip").addStream(inputStream, new ZipParameters());

【讨论】:

【参考方案3】:

使用Jeka https://jeka.devJkPathTree,很简单。

Path wholeDirToZip = Paths.get("dir/to/zip");
Path zipFile = Paths.get("file.zip");
JkPathTree.of(wholeDirToZip).zipTo(zipFile);

【讨论】:

【参考方案4】:

您主要需要创建两个函数。首先是 writeToZipFile(),其次是 createZipfileForOutPut .... 然后调用 createZipfileForOutPut('file name of .zip')` ...

 public static void writeToZipFile(String path, ZipOutputStream zipStream)
        throws FileNotFoundException, IOException 

    System.out.println("Writing file : '" + path + "' to zip file");

    File aFile = new File(path);
    FileInputStream fis = new FileInputStream(aFile);
    ZipEntry zipEntry = new ZipEntry(path);
    zipStream.putNextEntry(zipEntry);

    byte[] bytes = new byte[1024];
    int length;
    while ((length = fis.read(bytes)) >= 0) 
        zipStream.write(bytes, 0, length);
    

    zipStream.closeEntry();
    fis.close();


public static void createZipfileForOutPut(String filename) 
    String home = System.getProperty("user.home");
   // File directory = new File(home + "/Documents/" + "AutomationReport");
    File directory = new File("AutomationReport");
    if (!directory.exists()) 
        directory.mkdir();
    
    try 
        FileOutputStream fos = new FileOutputStream("Path to your destination" + filename + ".zip");
        ZipOutputStream zos = new ZipOutputStream(fos);

        writeToZipFile("Path to file which you want to compress / zip", zos);


        zos.close();
        fos.close();
     catch (FileNotFoundException e) 
        e.printStackTrace();
     catch (IOException e) 
        e.printStackTrace();
    

【讨论】:

【参考方案5】:

看这个例子:

StringBuilder sb = new StringBuilder();
sb.append("Test String");

File f = new File("d:\\test.zip");
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(f));
ZipEntry e = new ZipEntry("mytext.txt");
out.putNextEntry(e);

byte[] data = sb.toString().getBytes();
out.write(data, 0, data.length);
out.closeEntry();

out.close();

这将在D: 的根目录中创建一个名为test.zip 的压缩包,其中将包含一个名为mytext.txt 的文件。当然,你可以添加更多的 zip 条目,也可以像这样指定一个子目录:

ZipEntry e = new ZipEntry("folderName/mytext.txt");

您可以找到有关使用 Java here 进行压缩的更多信息。

【讨论】:

为什么这两行:byte[] data = sb.toString().getBytes(); out.write(data, 0, data.length); 包含在此代码示例中?他们的目的是什么? @kdzia,第一行将 StringBuilder 值转换为字节数组,第二行获取该字节数组并将其写入“test.zip”文件中的 ZipEntry。这些行是必要的,因为 Zip 文件使用字节数组,而不是字符串。 但是......在上面的例子中,除了“测试字符串”之外,StringBuilder 中还有什么其他内容吗?我对此也有些困惑。如果您将 sb.toString().getBytes() 写入 ZIP 文件,我希望您希望它包含您正在压缩的文件的字节?还是我错过了什么? @RobA 你没有错过任何东西。 StringBuilder 确实是为了包含 OP 从他的数据库中获得的文本。 OP 只需将“测试字符串”(包括引号)替换为 getTextFromDatabase() 谢谢,@Blueriver【参考方案6】:

Java 7 内置了 ZipFileSystem,可用于从 zip 文件创建、写入和读取文件。

Java Doc: ZipFileSystem Provider

Map<String, String> env = new HashMap<>();
// Create the zip file if it doesn't exist
env.put("create", "true");

URI uri = URI.create("jar:file:/codeSamples/zipfs/zipfstest.zip");

try (FileSystem zipfs = FileSystems.newFileSystem(uri, env)) 
    Path externalTxtFile = Paths.get("/codeSamples/zipfs/SomeTextFile.txt");
    Path pathInZipfile = zipfs.getPath("/SomeTextFile.txt");          
    // Copy a file into the zip file
    Files.copy(externalTxtFile, pathInZipfile, StandardCopyOption.REPLACE_EXISTING); 

【讨论】:

如果扩展名不是.zip,有没有办法让它工作?我需要编写一个.foo 文件,其格式与 zip 文件完全相同,但扩展名不同。我知道我可以创建一个.zip 文件并重命名它,但是使用正确的名称创建它会更简单。 @TroyDaniels 上面的示例也适用于不同的扩展名,因为它使用 jar:file: 前缀来创建 URI。 这里可能出现的唯一问题是,如果您有目录,它将无法工作。因此,例如,如果 pathInZipfile 变量中有“/dir/SomeTextFile.txt”,则需要在 .zip 存档中创建“dir”。为此,只需在调用 Files.copy 方法之前添加下一行:Files.createDirectories(pathInZipfile.getParent()) 如何设置压缩级别?【参考方案7】:

exportPathqueryResults 作为字符串变量,以下代码块在exportPath 下创建一个results.zip 文件,并将queryResults 的内容写入zip 内的results.txt 文件。

URI uri = URI.create("jar:file:" + exportPath + "/results.zip");
Map<String, String> env = Collections.singletonMap("create", "true");

try (FileSystem zipfs = FileSystems.newFileSystem(uri, env)) 
  Path filePath = zipfs.getPath("/results.txt");
  byte[] fileContent = queryResults.getBytes();

  Files.write(filePath, fileContent, StandardOpenOption.CREATE);

【讨论】:

【参考方案8】:

这是一个压缩整个目录(包括子文件和子目录)的示例代码,它使用了Java NIO的walk file tree特性。

import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class ZipCompress 
    public static void compress(String dirPath) 
        final Path sourceDir = Paths.get(dirPath);
        String zipFileName = dirPath.concat(".zip");
        try 
            final ZipOutputStream outputStream = new ZipOutputStream(new FileOutputStream(zipFileName));
            Files.walkFileTree(sourceDir, new SimpleFileVisitor<Path>() 
                @Override
                public FileVisitResult visitFile(Path file, BasicFileAttributes attributes) 
                    try 
                        Path targetFile = sourceDir.relativize(file);
                        outputStream.putNextEntry(new ZipEntry(targetFile.toString()));
                        byte[] bytes = Files.readAllBytes(file);
                        outputStream.write(bytes, 0, bytes.length);
                        outputStream.closeEntry();
                     catch (IOException e) 
                        e.printStackTrace();
                    
                    return FileVisitResult.CONTINUE;
                
            );
            outputStream.close();
         catch (IOException e) 
            e.printStackTrace();
        
    

要使用它,只需调用

ZipCompress.compress("target/directoryToCompress");

你会得到一个 zip 文件 directoryToCompress.zip

【讨论】:

如何包含当前目录? 如果输入和输出目录相同,也是再次压缩zip文件。【参考方案9】:
public static void zipFromTxt(String zipFilePath, String txtFilePath) 
    Assert.notNull(zipFilePath, "Zip file path is required");
    Assert.notNull(txtFilePath, "Txt file path is required");
    zipFromTxt(new File(zipFilePath), new File(txtFilePath));


public static void zipFromTxt(File zipFile, File txtFile) 
    ZipOutputStream out = null;
    FileInputStream in = null;
    try 
        Assert.notNull(zipFile, "Zip file is required");
        Assert.notNull(txtFile, "Txt file is required");
        out = new ZipOutputStream(new FileOutputStream(zipFile));
        in = new FileInputStream(txtFile);
        out.putNextEntry(new ZipEntry(txtFile.getName()));
        int len;
        byte[] buffer = new byte[1024];
        while ((len = in.read(buffer)) > 0) 
            out.write(buffer, 0, len);
            out.flush();
        
     catch (Exception e) 
        log.info("Zip from txt occur error,Detail message:", e.toString());
     finally 
        try 
            if (in != null) in.close();
            if (out != null) 
                out.closeEntry();
                out.close();
            
         catch (Exception e) 
            log.info("Zip from txt close error,Detail message:", e.toString());
        
    

【讨论】:

【参考方案10】:

单个文件:

String filePath = "/absolute/path/file1.txt";
String zipPath = "/absolute/path/output.zip";

try (ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(zipPath))) 
    File fileToZip = new File(filePath);
    zipOut.putNextEntry(new ZipEntry(fileToZip.getName()));
    Files.copy(fileToZip.toPath(), zipOut);

多个文件:

List<String> filePaths = Arrays.asList("/absolute/path/file1.txt", "/absolute/path/file2.txt");
String zipPath = "/absolute/path/output.zip";

try (ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(zipPath))) 
    for (String filePath : filePaths) 
        File fileToZip = new File(filePath);
        zipOut.putNextEntry(new ZipEntry(fileToZip.getName()));
        Files.copy(fileToZip.toPath(), zipOut);
    

【讨论】:

【参考方案11】:

这是从源文件创建 zip 文件的方式:

String srcFilename = "C:/myfile.txt";
String zipFile = "C:/myfile.zip";

try 
    byte[] buffer = new byte[1024];
    FileOutputStream fos = new FileOutputStream(zipFile);
    ZipOutputStream zos = new ZipOutputStream(fos);         
    File srcFile = new File(srcFilename);
    FileInputStream fis = new FileInputStream(srcFile);
    zos.putNextEntry(new ZipEntry(srcFile.getName()));          
    int length;
    while ((length = fis.read(buffer)) > 0) 
        zos.write(buffer, 0, length);
    
    zos.closeEntry();
    fis.close();
    zos.close();            

catch (IOException ioe) 
    System.out.println("Error creating zip file" + ioe);

【讨论】:

【参考方案12】:

由于我花了一段时间才弄清楚,我认为使用 Java 7+ ZipFileSystem 发布我的解决方案会很有帮助

 openZip(runFile);

 addToZip(filepath); //loop construct;  

 zipfs.close();

 private void openZip(File runFile) throws IOException 
    Map<String, String> env = new HashMap<>();
    env.put("create", "true");
    env.put("encoding", "UTF-8");
    Files.deleteIfExists(runFile.toPath());
    zipfs = FileSystems.newFileSystem(URI.create("jar:" + runFile.toURI().toString()), env);    
 

 private void addToZip(String filename) throws IOException 
    Path externalTxtFile = Paths.get(filename).toAbsolutePath();
    Path pathInZipfile = zipfs.getPath(filename.substring(filename.lastIndexOf("results"))); //all files to be stored have a common base folder, results/ in my case
    if (Files.isDirectory(externalTxtFile)) 
        Files.createDirectories(pathInZipfile);
        try (DirectoryStream<Path> ds = Files.newDirectoryStream(externalTxtFile)) 
            for (Path child : ds) 
                addToZip(child.normalize().toString()); //recursive call
            
        
     else 
        // copy file to zip file
        Files.copy(externalTxtFile, pathInZipfile, StandardCopyOption.REPLACE_EXISTING);            
    
 

【讨论】:

【参考方案13】:

Spring boot 控制器,将文件压缩到一个目录下,即可下载。

@RequestMapping(value = "/files.zip")
@ResponseBody
byte[] filesZip() throws IOException 
    File dir = new File("./");
    File[] filesArray = dir.listFiles();
    if (filesArray == null || filesArray.length == 0)
        System.out.println(dir.getAbsolutePath() + " have no file!");
    ByteArrayOutputStream bo = new ByteArrayOutputStream();
    ZipOutputStream zipOut= new ZipOutputStream(bo);
    for(File xlsFile:filesArray)
        if(!xlsFile.isFile())continue;
        ZipEntry zipEntry = new ZipEntry(xlsFile.getName());
        zipOut.putNextEntry(zipEntry);
        zipOut.write(IOUtils.toByteArray(new FileInputStream(xlsFile)));
        zipOut.closeEntry();
    
    zipOut.close();
    return bo.toByteArray();

【讨论】:

【参考方案14】:

如果您想在没有软件的情况下解压缩,最好使用此代码。其他带有 pdf 文件的代码在手动解压缩时发送错误

byte[] buffer = new byte[1024];     
    try
       
        FileOutputStream fos = new FileOutputStream("123.zip");
        ZipOutputStream zos = new ZipOutputStream(fos);
        ZipEntry ze= new ZipEntry("file.pdf");
        zos.putNextEntry(ze);
        FileInputStream in = new FileInputStream("file.pdf");
        int len;
        while ((len = in.read(buffer)) > 0) 
        
            zos.write(buffer, 0, len);
        
        in.close();
        zos.closeEntry();
        zos.close();
    
    catch(IOException ex)
    
       ex.printStackTrace();
    

【讨论】:

【参考方案15】:
public static void main(String args[])

    omtZip("res/", "omt.zip");

public static void omtZip(String path,String outputFile)

    final int BUFFER = 2048;
    boolean isEntry = false;
    ArrayList<String> directoryList = new ArrayList<String>();
    File f = new File(path);
    if(f.exists())
    
    try 
            FileOutputStream fos = new FileOutputStream(outputFile);
            ZipOutputStream zos = new ZipOutputStream(new BufferedOutputStream(fos));
            byte data[] = new byte[BUFFER];

            if(f.isDirectory())
            
               //This is Directory
                do
                    String directoryName = "";
                    if(directoryList.size() > 0)
                    
                        directoryName = directoryList.get(0);
                        System.out.println("Directory Name At 0 :"+directoryName);
                    
                    String fullPath = path+directoryName;
                    File fileList = null;
                    if(directoryList.size() == 0)
                    
                        //Main path (Root Directory)
                        fileList = f;
                    else
                    
                        //Child Directory
                        fileList = new File(fullPath);
                    
                    String[] filesName = fileList.list();

                    int totalFiles = filesName.length;
                    for(int i = 0 ; i < totalFiles ; i++)
                    
                        String name = filesName[i];
                        File filesOrDir = new File(fullPath+name);
                        if(filesOrDir.isDirectory())
                        
                            System.out.println("New Directory Entry :"+directoryName+name+"/");
                            ZipEntry entry = new ZipEntry(directoryName+name+"/");
                            zos.putNextEntry(entry);
                            isEntry = true;
                            directoryList.add(directoryName+name+"/");
                        else
                        
                            System.out.println("New File Entry :"+directoryName+name);
                            ZipEntry entry = new ZipEntry(directoryName+name);
                            zos.putNextEntry(entry);
                            isEntry = true;
                            FileInputStream fileInputStream = new FileInputStream(filesOrDir);
                            BufferedInputStream bufferedInputStream = new BufferedInputStream(fileInputStream, BUFFER);
                            int size = -1;
                            while(  (size = bufferedInputStream.read(data, 0, BUFFER)) != -1  )
                            
                                zos.write(data, 0, size);
                            
                            bufferedInputStream.close();
                        
                    
                    if(directoryList.size() > 0 && directoryName.trim().length() > 0)
                    
                        System.out.println("Directory removed :"+directoryName);
                        directoryList.remove(0);
                    

                while(directoryList.size() > 0);
            else
            
                //This is File
                //Zip this file
                System.out.println("Zip this file :"+f.getPath());
                FileInputStream fis = new FileInputStream(f);
                BufferedInputStream bis = new BufferedInputStream(fis,BUFFER);
                ZipEntry entry = new ZipEntry(f.getName());
                zos.putNextEntry(entry);
                isEntry = true;
                int size = -1 ;
                while(( size = bis.read(data,0,BUFFER)) != -1)
                
                    zos.write(data, 0, size);
                
                           

            //CHECK IS THERE ANY ENTRY IN ZIP ? ----START
            if(isEntry)
            
              zos.close();
            else
            
                zos = null;
                System.out.println("No Entry Found in Zip");
            
            //CHECK IS THERE ANY ENTRY IN ZIP ? ----START
        catch(Exception e)
        
            e.printStackTrace();
        
    else
    
        System.out.println("File or Directory not found");
    
     


【讨论】:

【参考方案16】:

要编写 ZIP 文件,请使用 ZipOutputStream。对于要放入 ZIP 文件的每个条目,您都创建一个 ZipEntry 对象。您将文件名传递给 ZipEntry 构造函数;它设置其他参数,例如文件日期和解压缩方法。如果您愿意,可以覆盖这些设置。然后,调用 ZipOutputStream 的 putNextEntry 方法开始写入新文件。将文件数据发送到 ZIP 流。完成后,调用 closeEntry。对要存储的所有文件重复此操作。这是一个代码框架:

FileOutputStream fout = new FileOutputStream("test.zip");
ZipOutputStream zout = new ZipOutputStream(fout);
for all files

    ZipEntry ze = new ZipEntry(filename);
    zout.putNextEntry(ze);
    send data to zout;
    zout.closeEntry();

zout.close();

【讨论】:

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