如何从 Java 中的输入流中读取多个 XML 文件并将它们写入 XML 文件?
我有这个:
InputStream is = new GZIPInputStream(new FileInputStream(file));
编辑:我有一个 tar.gz 文件,比如 xmls.tar.gz,它是包含多个 XML 文件的“文件”。当我使用以下方法将其转换为字符串时:
public static String convertStreamToString(java.io.InputStream is) {
java.util.Scanner s = new java.util.Scanner(is).useDelimiter("\\A");
return s.hasNext() ? s.next() : "";
}
我把所有的 XML 文件和文件信息链接在一起。我System.out.println
得到(这只是一个文件的开头):
blah.xml 60 0 0 2300 12077203627 10436 0ustar 0 0 <?xml version="1.0"...
回答:
这对我很有用,遵循 Keith 使用 Apache Compress 和 io 的建议:
http://thinktibits.blogspot.com/2013/01/read-extract-tar-file-java-example.html
import java.io.*;
import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
import org.apache.commons.io.IOUtils;
public class unTar {
public static void main(String[] args) throws Exception{
/* Read TAR File into TarArchiveInputStream */
TarArchiveInputStream myTarFile=new TarArchiveInputStream(new FileInputStream(new File("tar_ball.tar")));
/* To read individual TAR file */
TarArchiveEntry entry = null;
String individualFiles;
int offset;
FileOutputStream outputFile=null;
/* Create a loop to read every single entry in TAR file */
while ((entry = myTarFile.getNextTarEntry()) != null) {
/* Get the name of the file */
individualFiles = entry.getName();
/* Get Size of the file and create a byte array for the size */
byte[] content = new byte[(int) entry.getSize()];
offset=0;
/* Some SOP statements to check progress */
System.out.println("File Name in TAR File is: " + individualFiles);
System.out.println("Size of the File is: " + entry.getSize());
System.out.println("Byte Array length: " + content.length);
/* Read file from the archive into byte array */
myTarFile.read(content, offset, content.length - offset);
/* Define OutputStream for writing the file */
outputFile=new FileOutputStream(new File(individualFiles));
/* Use IOUtiles to write content of byte array to physical file */
IOUtils.write(content,outputFile);
/* Close Output Stream */
outputFile.close();
}
/* Close TarAchiveInputStream */
myTarFile.close();
}
}