blocks|key|1119823|text|我不知道有哪个Java库能做你所描述的事情。但您所描述的内容是实用的。您可以使用DotNetZip在.NET中完成此操作。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1119824|Michael+Krauklis是正确的，您不能简单地将数据“追加”到war文件或zip文件中，但这并不是因为严格地说，在war文件中有“文件结束”指示。这是因为war+(zip)格式包括一个目录，该目录通常位于文件末尾，其中包含war文件中各种条目的元数据。简单地附加到war文件会导致不更新目录，因此您只会得到一个附加了垃圾文件的war文件。|1119825|需要的是一个智能类，它能够理解这种格式，并且可以对war文件或压缩文件执行read%2Bupdate操作，包括适当的目录。DotNetZip可以做到这一点，而不会像您所描述或期望的那样解压缩/重新压缩未更改的条目。|1119826|entityMap|0|LINK|mutability|MUTABLE|url|http://dotnetzip.codeplex.com/^0|14|9|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]]]

I don't know of a Java library that does what you describe. But what you described is practical. You can do it in .NET, using <a href="http://dotnetzip.codeplex.com" rel="nofollow noreferrer">DotNetZip</a>. 

Michael Krauklis is correct that you cannot simply "append" data to a war file or zip file, but it is not because there is an "end of file" indication, strictly speaking, in a war file. It is because the war (zip) format includes a directory, which is normally present at the end of the file, that contains metadata for the various entries in the war file. Naively appending to a war file results in no update to the directory, and so you just have a war file with junk appended to it. 

What's necessary is an intelligent class that understands the format, and can read+update a war file or zip file, including the directory as appropriate. DotNetZip does this, without uncompressing/recompressing the unchanged entries, just as you described or desired.

blocks|key|1335025|text|正如Cheeso所说，没有办法做到这一点。AFAIK的zip前端和你在内部做的完全一样。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1335026|无论如何，如果您担心提取/压缩所有内容的速度，您可能想要尝试一下SevenZipJBindings库。|offset|length|1335027|几个月前，我在我的blog中介绍了这个库(很抱歉自动升级)。举个例子，使用java.util.zip解压一个104MB的zip文件需要12秒，而使用这个库需要4秒。|1335028|在这两个链接中，您都可以找到有关如何使用它的示例。|1335029|希望能有所帮助。|1335030|entityMap|0|LINK|mutability|MUTABLE|url|http://sevenzipjbind.sourceforge.net/|1|http://ctasada.blogspot.com/2009/09/best-way-of-working-with-zip-files-in.html^0|0|W|H|0|0|9|4|1|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@$D|X|E|Y|1|Z]]|A|$]]|$1|F|3|G|5|6|7|10|8|@]|9|@$D|11|E|12|1|13]]|A|$]]|$1|H|3|I|5|6|7|14|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|15|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]|T|$5|O|P|Q|A|$R|U]]]]

As Cheeso says, there's no way of doing it. AFAIK the zip front-ends are doing exactly the same as you internally.

Anyway if you're worried about the speed of extracting/compressing everything, you may want to try the <a href="http://sevenzipjbind.sourceforge.net/" rel="nofollow noreferrer">SevenZipJBindings</a> library.

I covered this library in my <a href="http://ctasada.blogspot.com/2009/09/best-way-of-working-with-zip-files-in.html" rel="nofollow noreferrer">blog</a> some months ago (sorry for the auto-promotion). Just as an example, extracting a 104MB zip file using the java.util.zip took me 12 seconds, while using this library took 4 seconds.

In both links you can find examples about how to use it.

Hope it helps.

blocks|key|1335053|text|我以前也有过类似的需求--但它是为了读取和写入压缩文件(.war格式应该是类似的)。我尝试过使用现有的Java+Zip流，但发现编写部分很麻烦--特别是涉及到目录的时候。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1335054|我将建议您尝试使用TrueZIP+(开放源码-+apache许可)库，该库将任何归档文件公开为虚拟文件系统，您可以像普通文件系统一样对其进行读写。它对我来说就像一个护身符，极大地简化了我的开发。|offset|length|1335055|entityMap|0|LINK|mutability|MUTABLE|url|http://www.mojohaus.org/truezip/truezip-maven-plugin/^0|0|9|7|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

I had a similar requirement sometime back - but it was for reading and writing zip archives (.war format should be similar). I tried doing it with the existing Java Zip streams but found the writing part cumbersome - especially when directories where involved. 

I'll recommend you to try out the <a href="http://www.mojohaus.org/truezip/truezip-maven-plugin/" rel="nofollow noreferrer">TrueZIP</a> (open source - apache style licensed) library that exposes any archive as a virtual file system into which you can read and write like a normal filesystem. It worked like a charm for me and greatly simplified my development.

blocks|key|1119975|text|正如其他人提到的，不可能将内容附加到现有的zip+(或war)。但是，可以在不临时将提取的内容写入磁盘的情况下即时创建新的zip。很难猜测这会快多少，但这是使用标准Java所能达到的最快速度(至少据我所知)。正如卡洛斯·塔萨达所提到的，SevenZipJBindings可能会占用您一些额外的时间，但是将这种方法移植到SevenZipJBindings仍然比使用具有相同库的临时文件更快。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1119976|下面是一些代码，用于写入现有压缩包(war.zip)的内容，并将额外的文件(answer.txt)附加到新压缩包(append.zip)。它只需要Java5或更高版本，不需要额外的库。|1119977|import+java.io.File;
import+java.io.FileOutputStream;
import+java.io.IOException;
import+java.io.InputStream;
import+java.io.OutputStream;
import+java.util.Enumeration;
import+java.util.zip.ZipEntry;
import+java.util.zip.ZipFile;
import+java.util.zip.ZipOutputStream;

public+class+Main+{

++++//+4MB+buffer
++++private+static+final+byte[]+BUFFER+=+new+byte[4096+*+1024];

++++/**
+++++*+copy+input+to+output+stream+-+available+in+several+StreamUtils+or+Streams+classes+
+++++*/++++
++++public+static+void+copy(InputStream+input,+OutputStream+output)+throws+IOException+{
++++++++int+bytesRead;
++++++++while+((bytesRead+=+input.read(BUFFER))!=+-1)+{
++++++++++++output.write(BUFFER,+0,+bytesRead);
++++++++}
++++}

++++public+static+void+main(String[]+args)+throws+Exception+{
++++++++//+read+war.zip+and+write+to+append.zip
++++++++ZipFile+war+=+new+ZipFile("war.zip");
++++++++ZipOutputStream+append+=+new+ZipOutputStream(new+FileOutputStream("append.zip"));

++++++++//+first,+copy+contents+from+existing+war
++++++++Enumeration<?+extends+ZipEntry>+entries+=+war.entries();
++++++++while+(entries.hasMoreElements())+{
++++++++++++ZipEntry+e+=+entries.nextElement();
++++++++++++System.out.println("copy:+"+%2B+e.getName());
++++++++++++append.putNextEntry(e);
++++++++++++if+(!e.isDirectory())+{
++++++++++++++++copy(war.getInputStream(e),+append);
++++++++++++}
++++++++++++append.closeEntry();
++++++++}

++++++++//+now+append+some+extra+content
++++++++ZipEntry+e+=+new+ZipEntry("answer.txt");
++++++++System.out.println("append:+"+%2B+e.getName());
++++++++append.putNextEntry(e);
++++++++append.write("42\n".getBytes());
++++++++append.closeEntry();

++++++++//+close
++++++++war.close();
++++++++append.close();
++++}
}|code-block|syntax|javascript|1119978|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

As others mentioned, it's not possible to append content to an existing zip (or war). However, it's possible to create a new zip on the fly without temporarily writing extracted content to disk. It's hard to guess how much faster this will be, but it's the fastest you can get (at least as far as I know) with standard Java. As mentioned by Carlos Tasada, SevenZipJBindings might squeeze out you some extra seconds, but porting this approach to SevenZipJBindings will still be faster than using temporary files with the same library.

Here's some code that writes the contents of an existing zip (war.zip) and appends an extra file (answer.txt) to a new zip (append.zip). All it takes is Java 5 or later, no extra libraries needed.

<pre><code>import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

public class Main {

 // 4MB buffer
 private static final byte[] BUFFER = new byte[4096 * 1024];

 /**
 * copy input to output stream - available in several StreamUtils or Streams classes 
 */ 
 public static void copy(InputStream input, OutputStream output) throws IOException {
 int bytesRead;
 while ((bytesRead = input.read(BUFFER))!= -1) {
 output.write(BUFFER, 0, bytesRead);
 }
 }

 public static void main(String[] args) throws Exception {
 // read war.zip and write to append.zip
 ZipFile war = new ZipFile("war.zip");
 ZipOutputStream append = new ZipOutputStream(new FileOutputStream("append.zip"));

 // first, copy contents from existing war
 Enumeration&lt;? extends ZipEntry&gt; entries = war.entries();
 while (entries.hasMoreElements()) {
 ZipEntry e = entries.nextElement();
 System.out.println("copy: " + e.getName());
 append.putNextEntry(e);
 if (!e.isDirectory()) {
 copy(war.getInputStream(e), append);
 }
 append.closeEntry();
 }

 // now append some extra content
 ZipEntry e = new ZipEntry("answer.txt");
 System.out.println("append: " + e.getName());
 append.putNextEntry(e);
 append.write("42\n".getBytes());
 append.closeEntry();

 // close
 war.close();
 append.close();
 }
}
</code></pre>

blocks|key|1335190|text|还有另一种解决方案:你可能会发现下面的代码在其他情况下也很有用。我已经使用ant这种方式编译Java目录，生成jar文件，更新zip文件，...|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1335191|++++public+static+void+antUpdateZip(String+zipFilePath,+String+libsToAddDir)+{
++++Project+p+=+new+Project();
++++p.init();

++++Target+target+=+new+Target();
++++target.setName("zip");
++++Zip+task+=+new+Zip();
++++task.init();
++++task.setDestFile(new+File(zipFilePath));
++++ZipFileSet+zipFileSet+=+new+ZipFileSet();
++++zipFileSet.setPrefix("WEB-INF/lib");
++++zipFileSet.setDir(new+File(libsToAddDir));
++++task.addFileset(zipFileSet);
++++task.setUpdate(true);

++++task.setProject(p);
++++task.init();
++++target.addTask(task);
++++target.setProject(p);
++++p.addTarget(target);

++++DefaultLogger+consoleLogger+=+new+DefaultLogger();
++++consoleLogger.setErrorPrintStream(System.err);
++++consoleLogger.setOutputPrintStream(System.out);
++++consoleLogger.setMessageOutputLevel(Project.MSG_DEBUG);
++++p.addBuildListener(consoleLogger);

++++try+{
++++++++//+p.fireBuildStarted();

++++++++//+ProjectHelper+helper+=+ProjectHelper.getProjectHelper();
++++++++//+p.addReference("ant.projectHelper",+helper);
++++++++//+helper.parse(p,+buildFile);
++++++++p.executeTarget(target.getName());
++++++++//+p.fireBuildFinished(null);
++++}+catch+(BuildException+e)+{
++++++++p.fireBuildFinished(e);
++++++++throw+new+AssertionError(e);
++++}
}|code-block|syntax|javascript|1335192|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Yet Another Solution: You may find code below useful in other situations as well. I have used ant this way to compile Java directories, generating jar files, updating zip files,...

<pre><code> public static void antUpdateZip(String zipFilePath, String libsToAddDir) {
 Project p = new Project();
 p.init();

 Target target = new Target();
 target.setName("zip");
 Zip task = new Zip();
 task.init();
 task.setDestFile(new File(zipFilePath));
 ZipFileSet zipFileSet = new ZipFileSet();
 zipFileSet.setPrefix("WEB-INF/lib");
 zipFileSet.setDir(new File(libsToAddDir));
 task.addFileset(zipFileSet);
 task.setUpdate(true);

 task.setProject(p);
 task.init();
 target.addTask(task);
 target.setProject(p);
 p.addTarget(target);

 DefaultLogger consoleLogger = new DefaultLogger();
 consoleLogger.setErrorPrintStream(System.err);
 consoleLogger.setOutputPrintStream(System.out);
 consoleLogger.setMessageOutputLevel(Project.MSG_DEBUG);
 p.addBuildListener(consoleLogger);

 try {
 // p.fireBuildStarted();

 // ProjectHelper helper = ProjectHelper.getProjectHelper();
 // p.addReference("ant.projectHelper", helper);
 // helper.parse(p, buildFile);
 p.executeTarget(target.getName());
 // p.fireBuildFinished(null);
 } catch (BuildException e) {
 p.fireBuildFinished(e);
 throw new AssertionError(e);
 }
}
</code></pre>

blocks|key|1335239|text|你可以使用我写的这段代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1335240|public+static+void+addFilesToZip(File+source,+File[]+files)
{
++++try
++++{

++++++++File+tmpZip+=+File.createTempFile(source.getName(),+null);
++++++++tmpZip.delete();
++++++++if(!source.renameTo(tmpZip))
++++++++{
++++++++++++throw+new+Exception("Could+not+make+temp+file+("+%2B+source.getName()+%2B+")");
++++++++}
++++++++byte[]+buffer+=+new+byte[1024];
++++++++ZipInputStream+zin+=+new+ZipInputStream(new+FileInputStream(tmpZip));
++++++++ZipOutputStream+out+=+new+ZipOutputStream(new+FileOutputStream(source));

++++++++for(int+i+=+0;+i+<+files.length;+i%2B%2B)
++++++++{
++++++++++++InputStream+in+=+new+FileInputStream(files[i]);
++++++++++++out.putNextEntry(new+ZipEntry(files[i].getName()));
++++++++++++for(int+read+=+in.read(buffer);+read+>+-1;+read+=+in.read(buffer))
++++++++++++{
++++++++++++++++out.write(buffer,+0,+read);
++++++++++++}
++++++++++++out.closeEntry();
++++++++++++in.close();
++++++++}

++++++++for(ZipEntry+ze+=+zin.getNextEntry();+ze+!=+null;+ze+=+zin.getNextEntry())
++++++++{
++++++++++++out.putNextEntry(ze);
++++++++++++for(int+read+=+zin.read(buffer);+read+>+-1;+read+=+zin.read(buffer))
++++++++++++{
++++++++++++++++out.write(buffer,+0,+read);
++++++++++++}
++++++++++++out.closeEntry();
++++++++}

++++++++out.close();
++++++++tmpZip.delete();
++++}
++++catch(Exception+e)
++++{
++++++++e.printStackTrace();
++++}
}|code-block|syntax|javascript|1335241|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You could use this bit of code I wrote

<pre><code>public static void addFilesToZip(File source, File[] files)
{
 try
 {

 File tmpZip = File.createTempFile(source.getName(), null);
 tmpZip.delete();
 if(!source.renameTo(tmpZip))
 {
 throw new Exception("Could not make temp file (" + source.getName() + ")");
 }
 byte[] buffer = new byte[1024];
 ZipInputStream zin = new ZipInputStream(new FileInputStream(tmpZip));
 ZipOutputStream out = new ZipOutputStream(new FileOutputStream(source));

 for(int i = 0; i &lt; files.length; i++)
 {
 InputStream in = new FileInputStream(files[i]);
 out.putNextEntry(new ZipEntry(files[i].getName()));
 for(int read = in.read(buffer); read &gt; -1; read = in.read(buffer))
 {
 out.write(buffer, 0, read);
 }
 out.closeEntry();
 in.close();
 }

 for(ZipEntry ze = zin.getNextEntry(); ze != null; ze = zin.getNextEntry())
 {
 out.putNextEntry(ze);
 for(int read = zin.read(buffer); read &gt; -1; read = zin.read(buffer))
 {
 out.write(buffer, 0, read);
 }
 out.closeEntry();
 }

 out.close();
 tmpZip.delete();
 }
 catch(Exception e)
 {
 e.printStackTrace();
 }
}
</code></pre>

blocks|key|1120131|text|在Java7中，我们得到了Zip+File+System，它允许在压缩包(jar、war)中添加和更改文件，而无需手动重新打包。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1120132|我们可以直接写入zip文件中的文件，如下例所示。|1120133|Map<String,+String>+env+=+new+HashMap<>();+
env.put("create",+"true");
Path+path+=+Paths.get("test.zip");
URI+uri+=+URI.create("jar:"+%2B+path.toUri());
try+(FileSystem+fs+=+FileSystems.newFileSystem(uri,+env))
{
++++Path+nf+=+fs.getPath("new.txt");
++++try+(Writer+writer+=+Files.newBufferedWriter(nf,+StandardCharsets.UTF_8,+StandardOpenOption.CREATE))+{
++++++++writer.write("hello");
++++}
}|code-block|syntax|javascript|1120134|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.oracle.com/javase/7/docs/technotes/guides/io/fsp/zipfilesystemprovider.html^0|D|F|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

In Java 7 we got <a href="http://docs.oracle.com/javase/7/docs/technotes/guides/io/fsp/zipfilesystemprovider.html">Zip File System</a> that allows adding and changing files in zip (jar, war) without manual repackaging.

We can directly write to files inside zip files as in the following example.

<pre><code>Map&lt;String, String&gt; env = new HashMap&lt;&gt;(); 
env.put("create", "true");
Path path = Paths.get("test.zip");
URI uri = URI.create("jar:" + path.toUri());
try (FileSystem fs = FileSystems.newFileSystem(uri, env))
{
 Path nf = fs.getPath("new.txt");
 try (Writer writer = Files.newBufferedWriter(nf, StandardCharsets.UTF_8, StandardOpenOption.CREATE)) {
 writer.write("hello");
 }
}
</code></pre>

blocks|key|1120167|text|这是Liam+answer的Java+1.7版本，它使用了try+with+resources和Apache+Commons+IO。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1120168|输出被写入到一个新的zip文件中，但是可以很容易地将其修改为写入原始文件。|1120169|++/**
+++*+Modifies,+adds+or+deletes+file(s)+from+a+existing+zip+file.
+++*
+++*+@param+zipFile+the+original+zip+file
+++*+@param+newZipFile+the+destination+zip+file
+++*+@param+filesToAddOrOverwrite+the+names+of+the+files+to+add+or+modify+from+the+original+file
+++*+@param+filesToAddOrOverwriteInputStreams+the+input+streams+containing+the+content+of+the+files
+++*+to+add+or+modify+from+the+original+file
+++*+@param+filesToDelete+the+names+of+the+files+to+delete+from+the+original+file
+++*+@throws+IOException+if+the+new+file+could+not+be+written
+++*/
++public+static+void+modifyZipFile(File+zipFile,
++++++File+newZipFile,
++++++String[]+filesToAddOrOverwrite,
++++++InputStream[]+filesToAddOrOverwriteInputStreams,
++++++String[]+filesToDelete)+throws+IOException+{


++++try+(ZipOutputStream+out+=+new+ZipOutputStream(new+FileOutputStream(newZipFile)))+{

++++++//+add+existing+ZIP+entry+to+output+stream
++++++try+(ZipInputStream+zin+=+new+ZipInputStream(new+FileInputStream(zipFile)))+{
++++++++ZipEntry+entry+=+null;
++++++++while+((entry+=+zin.getNextEntry())+!=+null)+{
++++++++++String+name+=+entry.getName();

++++++++++//+check+if+the+file+should+be+deleted
++++++++++if+(filesToDelete+!=+null)+{
++++++++++++boolean+ignoreFile+=+false;
++++++++++++for+(String+fileToDelete+:+filesToDelete)+{
++++++++++++++if+(name.equalsIgnoreCase(fileToDelete))+{
++++++++++++++++ignoreFile+=+true;
++++++++++++++++break;
++++++++++++++}
++++++++++++}
++++++++++++if+(ignoreFile)+{
++++++++++++++continue;
++++++++++++}
++++++++++}

++++++++++//+check+if+the+file+should+be+kept+as+it+is
++++++++++boolean+keepFileUnchanged+=+true;
++++++++++if+(filesToAddOrOverwrite+!=+null)+{
++++++++++++for+(String+fileToAddOrOverwrite+:+filesToAddOrOverwrite)+{
++++++++++++++if+(name.equalsIgnoreCase(fileToAddOrOverwrite))+{
++++++++++++++++keepFileUnchanged+=+false;
++++++++++++++}
++++++++++++}
++++++++++}

++++++++++if+(keepFileUnchanged)+{
++++++++++++//+copy+the+file+as+it+is
++++++++++++out.putNextEntry(new+ZipEntry(name));
++++++++++++IOUtils.copy(zin,+out);
++++++++++}
++++++++}
++++++}

++++++//+add+the+modified+or+added+files+to+the+zip+file
++++++if+(filesToAddOrOverwrite+!=+null)+{
++++++++for+(int+i+=+0;+i+<+filesToAddOrOverwrite.length;+i%2B%2B)+{
++++++++++String+fileToAddOrOverwrite+=+filesToAddOrOverwrite[i];
++++++++++try+(InputStream+in+=+filesToAddOrOverwriteInputStreams[i])+{
++++++++++++out.putNextEntry(new+ZipEntry(fileToAddOrOverwrite));
++++++++++++IOUtils.copy(in,+out);
++++++++++++out.closeEntry();
++++++++++}
++++++++}
++++++}

++++}

++}|code-block|syntax|javascript|1120170|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Here is Java 1.7 version of Liam answer which uses try with resources and Apache Commons IO.

The output is written to a new zip file but it can be easily modified to write to the original file. 

<pre><code> /**
 * Modifies, adds or deletes file(s) from a existing zip file.
 *
 * @param zipFile the original zip file
 * @param newZipFile the destination zip file
 * @param filesToAddOrOverwrite the names of the files to add or modify from the original file
 * @param filesToAddOrOverwriteInputStreams the input streams containing the content of the files
 * to add or modify from the original file
 * @param filesToDelete the names of the files to delete from the original file
 * @throws IOException if the new file could not be written
 */
 public static void modifyZipFile(File zipFile,
 File newZipFile,
 String[] filesToAddOrOverwrite,
 InputStream[] filesToAddOrOverwriteInputStreams,
 String[] filesToDelete) throws IOException {


 try (ZipOutputStream out = new ZipOutputStream(new FileOutputStream(newZipFile))) {

 // add existing ZIP entry to output stream
 try (ZipInputStream zin = new ZipInputStream(new FileInputStream(zipFile))) {
 ZipEntry entry = null;
 while ((entry = zin.getNextEntry()) != null) {
 String name = entry.getName();

 // check if the file should be deleted
 if (filesToDelete != null) {
 boolean ignoreFile = false;
 for (String fileToDelete : filesToDelete) {
 if (name.equalsIgnoreCase(fileToDelete)) {
 ignoreFile = true;
 break;
 }
 }
 if (ignoreFile) {
 continue;
 }
 }

 // check if the file should be kept as it is
 boolean keepFileUnchanged = true;
 if (filesToAddOrOverwrite != null) {
 for (String fileToAddOrOverwrite : filesToAddOrOverwrite) {
 if (name.equalsIgnoreCase(fileToAddOrOverwrite)) {
 keepFileUnchanged = false;
 }
 }
 }

 if (keepFileUnchanged) {
 // copy the file as it is
 out.putNextEntry(new ZipEntry(name));
 IOUtils.copy(zin, out);
 }
 }
 }

 // add the modified or added files to the zip file
 if (filesToAddOrOverwrite != null) {
 for (int i = 0; i &lt; filesToAddOrOverwrite.length; i++) {
 String fileToAddOrOverwrite = filesToAddOrOverwrite[i];
 try (InputStream in = filesToAddOrOverwriteInputStreams[i]) {
 out.putNextEntry(new ZipEntry(fileToAddOrOverwrite));
 IOUtils.copy(in, out);
 out.closeEntry();
 }
 }
 }

 }

 }
</code></pre>

blocks|key|1335320|text|这是一段使用servlet获取响应并发送响应的简单代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1335321|myZipPath+=+bla+bla...
++++byte[]+buf+=+new+byte[8192];
++++String+zipName+=+"myZip.zip";
++++String+zipPath+=+myzippath%2B+File.separator%2B"pdf"+%2B+File.separator%2B+zipName;
++++File+pdfFile+=+new+File("myPdf.pdf");
++++ZipOutputStream+out+=+new+ZipOutputStream(new+FileOutputStream(zipPath));
++++ZipEntry+zipEntry+=+new+ZipEntry(pdfFile.getName());
++++out.putNextEntry(zipEntry);
++++InputStream+in+=+new+FileInputStream(pdfFile);
++++int+len;
++++while+((len+=+in.read(buf))+>+0)+{
+++++++++out.write(buf,+0,+len);
+++++}
++++out.closeEntry();
++++in.close();
+++++out.close();
++++++++++++++++FileInputStream+fis+=+new+FileInputStream(zipPath);
++++++++++++++++response.setContentType("application/zip");
++++++++++++++++response.addHeader("content-disposition",+"attachment;filename="+%2B+zipName);
++++OutputStream+os+=+response.getOutputStream();
++++++++++++int+length+=+is.read(buffer);
++++++++++++while+(length+!=+-1)
++++++++++++{
++++++++++++++++os.write(buffer,+0,+length);
++++++++++++++++length+=+is.read(buffer);
++++++++++++}|code-block|syntax|javascript|1335322|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

this a simple code to get a response with using servlet and send a response

<pre><code>myZipPath = bla bla...
 byte[] buf = new byte[8192];
 String zipName = "myZip.zip";
 String zipPath = myzippath+ File.separator+"pdf" + File.separator+ zipName;
 File pdfFile = new File("myPdf.pdf");
 ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipPath));
 ZipEntry zipEntry = new ZipEntry(pdfFile.getName());
 out.putNextEntry(zipEntry);
 InputStream in = new FileInputStream(pdfFile);
 int len;
 while ((len = in.read(buf)) &gt; 0) {
 out.write(buf, 0, len);
 }
 out.closeEntry();
 in.close();
 out.close();
 FileInputStream fis = new FileInputStream(zipPath);
 response.setContentType("application/zip");
 response.addHeader("content-disposition", "attachment;filename=" + zipName);
 OutputStream os = response.getOutputStream();
 int length = is.read(buffer);
 while (length != -1)
 {
 os.write(buffer, 0, length);
 length = is.read(buffer);
 }
</code></pre>

blocks|key|1335355|text|如果你不想使用额外的库，这是100%25有效的。1)首先，将文件附加到zip的类。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1335356|import+java.io.File;
import+java.io.FileInputStream;
import+java.io.FileNotFoundException;
import+java.io.IOException;
import+java.util.logging.Level;
import+java.util.logging.Logger;
import+java.util.zip.ZipEntry;
import+java.util.zip.ZipOutputStream;

public+class+AddZip+{

++++public+void+AddZip()+{
++++}

++++public+void+addToZipFile(ZipOutputStream+zos,+String+nombreFileAnadir,+String+nombreDentroZip)+{
++++++++FileInputStream+fis+=+null;
++++++++try+{
++++++++++++if+(!new+File(nombreFileAnadir).exists())+{//NO+EXISTE+
++++++++++++++++System.out.println("+No+existe+el+archivo+:++"+%2B+nombreFileAnadir);return;
++++++++++++}
++++++++++++File+file+=+new+File(nombreFileAnadir);
++++++++++++System.out.println("+Generando+el+archivo+'"+%2B+nombreFileAnadir+%2B+"'+al+ZIP+");
++++++++++++fis+=+new+FileInputStream(file);
++++++++++++ZipEntry+zipEntry+=+new+ZipEntry(nombreDentroZip);
++++++++++++zos.putNextEntry(zipEntry);
++++++++++++byte[]+bytes+=+new+byte[1024];
++++++++++++int+length;
++++++++++++while+((length+=+fis.read(bytes))+>=+0)+{zos.write(bytes,+0,+length);}
++++++++++++zos.closeEntry();
++++++++++++fis.close();

++++++++}+catch+(FileNotFoundException+ex+)+{
++++++++++++Logger.getLogger(AddZip.class.getName()).log(Level.SEVERE,+null,+ex);
++++++++}+catch+(IOException+ex)+{
++++++++++++Logger.getLogger(AddZip.class.getName()).log(Level.SEVERE,+null,+ex);
++++++++}+
++++}

}|code-block|syntax|javascript|1335357|2)你可以在你的控制器中调用它。|1335358|//in+the+top
try+{
fos+=+new+FileOutputStream(rutaZip);
zos+=+++new+ZipOutputStream(fos);
}+catch+(FileNotFoundException+ex)+{
Logger.getLogger(UtilZip.class.getName()).log(Level.SEVERE,+null,+ex);
}

...
//inside+your+method
addZip.addToZipFile(zos,+pathFolderFileSystemHD()+%2B+itemFoto.getNombre(),+"foto/"+%2B+itemFoto.getNombre());|1335359|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

this works 100% , if you dont want to use extra libs ..
1) first, the class that append files to the zip ..

<pre><code>import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class AddZip {

 public void AddZip() {
 }

 public void addToZipFile(ZipOutputStream zos, String nombreFileAnadir, String nombreDentroZip) {
 FileInputStream fis = null;
 try {
 if (!new File(nombreFileAnadir).exists()) {//NO EXISTE 
 System.out.println(" No existe el archivo : " + nombreFileAnadir);return;
 }
 File file = new File(nombreFileAnadir);
 System.out.println(" Generando el archivo '" + nombreFileAnadir + "' al ZIP ");
 fis = new FileInputStream(file);
 ZipEntry zipEntry = new ZipEntry(nombreDentroZip);
 zos.putNextEntry(zipEntry);
 byte[] bytes = new byte[1024];
 int length;
 while ((length = fis.read(bytes)) &gt;= 0) {zos.write(bytes, 0, length);}
 zos.closeEntry();
 fis.close();

 } catch (FileNotFoundException ex ) {
 Logger.getLogger(AddZip.class.getName()).log(Level.SEVERE, null, ex);
 } catch (IOException ex) {
 Logger.getLogger(AddZip.class.getName()).log(Level.SEVERE, null, ex);
 } 
 }

}
</code></pre>

2) you can call it in your controller ..

<pre><code>//in the top
try {
fos = new FileOutputStream(rutaZip);
zos = new ZipOutputStream(fos);
} catch (FileNotFoundException ex) {
Logger.getLogger(UtilZip.class.getName()).log(Level.SEVERE, null, ex);
}

...
//inside your method
addZip.addToZipFile(zos, pathFolderFileSystemHD() + itemFoto.getNombre(), "foto/" + itemFoto.getNombre());
</code></pre>

blocks|key|1335419|text|以下是如何使用TrueVFS轻松地将文件附加到现有压缩包中的示例|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1335420|//+append+a+file+to+archive+under+different+name
TFile.cp(new+File("existingFile.txt"),+new+TFile("archive.zip",+"entry.txt"));

//+recusively+append+a+dir+to+the+root+of+archive
TFile+src+=+new+TFile("dirPath",+"dirName");
src.cp_r(new+TFile("archive.zip",+src.getName()));|code-block|syntax|javascript|1335421|TrueZIP的继任者TrueVFS在适当的情况下使用Java7NIO2特性，但提供了类似much+more+features的线程安全异步并行压缩。|1335422|还要注意的是，Java7+ZipFileSystem在巨大的输入上默认是vulnerable+to+OutOfMemoryError。|1335423|entityMap|0|LINK|mutability|MUTABLE|url|https://truevfs.java.net/|1|https://truevfs.java.net/features.html|2|https://stackoverflow.com/questions/23858706/zipping-a-huge-folder-by-using-a-zipfilesystem-results-in-outofmemoryerror^0|7|7|0|0|0|19|I|1|0|10|U|2|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@$A|14|B|15|1|16]]|C|$]]|$1|K|3|L|5|6|7|17|8|@]|9|@$A|18|B|19|1|1A]]|C|$]]|$1|M|3|-4|5|6|7|1B|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]|U|$5|P|Q|R|C|$S|V]]|W|$5|P|Q|R|C|$S|X]]]]

Here are examples how easily files can be appended to existing zip using <a href="https://truevfs.java.net/" rel="nofollow noreferrer">TrueVFS</a>:

<pre><code>// append a file to archive under different name
TFile.cp(new File("existingFile.txt"), new TFile("archive.zip", "entry.txt"));

// recusively append a dir to the root of archive
TFile src = new TFile("dirPath", "dirName");
src.cp_r(new TFile("archive.zip", src.getName()));
</code></pre>

TrueVFS, the successor of TrueZIP, uses Java 7 NIO 2 features under the hood when appropriate but offers <a href="https://truevfs.java.net/features.html" rel="nofollow noreferrer">much more features</a> like thread-safe async parallel compression.

Beware also that Java 7 ZipFileSystem by default is <a href="https://stackoverflow.com/questions/23858706/zipping-a-huge-folder-by-using-a-zipfilesystem-results-in-outofmemoryerror">vulnerable to OutOfMemoryError</a> on huge inputs.

blocks|key|1335492|text|根据上面@sfussenegger给出的答案，使用以下代码附加到jar文件并下载它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1335493|public+void+doGet(HttpServletRequest+request,+HttpServletResponse+response)+throws+ServletException,+IOException+{

++++Resource+resourceFile+=+resourceLoader.getResource("WEB-INF/lib/custom.jar");
++++ByteArrayOutputStream+baos+=+new+ByteArrayOutputStream();
++++try+(ZipOutputStream+zos+=+new+ZipOutputStream(baos,+StandardCharsets.ISO_8859_1);)+{
++++++++try+(ZipFile+zin+=+new+ZipFile(resourceFile.getFile(),+StandardCharsets.ISO_8859_1);)+{
++++++++++++zin.stream().forEach((entry)+->+{
++++++++++++++++try+{
++++++++++++++++++++zos.putNextEntry(entry);
++++++++++++++++++++if+(!entry.isDirectory())+{
++++++++++++++++++++++++zin.getInputStream(entry).transferTo(zos);
++++++++++++++++++++}
++++++++++++++++++++zos.closeEntry();
++++++++++++++++}+catch+(Exception+ex)+{
++++++++++++++++++++ex.printStackTrace();
++++++++++++++++}
++++++++++++});
++++++++}
++++++++/*+build+file+records+to+be+appended+*/
++++++++....
++++++++for+(FileContents+record+:+records)+{
++++++++++++zos.putNextEntry(new+ZipEntry(record.getFileName()));
++++++++++++zos.write(record.getBytes());
++++++++++++zos.closeEntry();
++++++++}
++++++++zos.flush();
++++}

++++response.setContentType("application/java-archive");
++++response.setContentLength(baos.size());
++++response.setHeader(HttpHeaders.CONTENT_DISPOSITION,+"attachment;+filename=\"custom.jar\"");
++++try+(BufferedOutputStream+out+=+new+BufferedOutputStream(response.getOutputStream()))+{
++++++++baos.writeTo(out);
++++}
}|code-block|syntax|javascript|1335494|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Based on the answer given by @sfussenegger above, following code is used to append to a jar file and download it:

<pre><code>public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

 Resource resourceFile = resourceLoader.getResource("WEB-INF/lib/custom.jar");
 ByteArrayOutputStream baos = new ByteArrayOutputStream();
 try (ZipOutputStream zos = new ZipOutputStream(baos, StandardCharsets.ISO_8859_1);) {
 try (ZipFile zin = new ZipFile(resourceFile.getFile(), StandardCharsets.ISO_8859_1);) {
 zin.stream().forEach((entry) -&gt; {
 try {
 zos.putNextEntry(entry);
 if (!entry.isDirectory()) {
 zin.getInputStream(entry).transferTo(zos);
 }
 zos.closeEntry();
 } catch (Exception ex) {
 ex.printStackTrace();
 }
 });
 }
 /* build file records to be appended */
 ....
 for (FileContents record : records) {
 zos.putNextEntry(new ZipEntry(record.getFileName()));
 zos.write(record.getBytes());
 zos.closeEntry();
 }
 zos.flush();
 }

 response.setContentType("application/java-archive");
 response.setContentLength(baos.size());
 response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"custom.jar\"");
 try (BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream())) {
 baos.writeTo(out);
 }
}
</code></pre>

I am currently extracting the contents of a war file and then adding some new files to the directory structure and then creating a new war file.

This is all done programatically from Java - but I am wondering if it wouldn't be more efficient to copy the war file and then just append the files - then I wouldn't have to wait so long as the war expands and then has to be compressed again.

I can't seem to find a way to do this in the documentation though or any online examples.

Anyone can give some tips or pointers?

UPDATE:

TrueZip as mentioned in one of the answers seems to be a very good java library to append to a zip file (despite other answers that say it is not possible to do this).

Anyone have experience or feedback on TrueZip or can recommend other similar libaries?

Appending files to a zip file with Java

文件系统

Java

我目前正在提取一个war文件的内容，然后将一些新文件添加到目录结构中，然后创建一个新的war文件。这一切都是在Java中以编程方式完成的--但我想知道，复制war文件然后添加文件是不是更有效率--这样我就不必等待war扩展，然后再进行压缩。不过，在文档或任何在线示例中，我似乎找不到这样做的方法。有谁能给点建议或指点吗？...

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