package test1;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;
import java.util.jar.Manifest;
public class ReadJar {
//public class JarFileReader {
private JarInputStream jarInput;
private HashMap
public ReadJar(InputStream in) throws IOException {
jarInput = new JarInputStream(in);
entriesStreamMap = new HashMap
}
public void readEntries() throws IOException {
JarEntry entry = jarInput.getNextJarEntry();
String manifestEntry = null;
while(entry != null) {
System.out.println(“Entry Name = “ + entry.getName());
if(“jp/co/sony/csl/nielsen/phoenix/objectremoval/Mark.class”.equals(entry.getName())) {
manifestEntry = entry.getName();
copyInputStream(jarInput, entry.getName());
}
entry = jarInput.getNextJarEntry();
}
System.out.println(“Now!! + get jar entry inputstream again…”);
InputStream inputStream = getCopy(manifestEntry);
System.out.println(inputStream.read());
}
public void copyInputStream(InputStream in, String entryName) throws IOException {
if(!entriesStreamMap.containsKey(entryName)) {
ByteArrayOutputStream _copy = new ByteArrayOutputStream();
int read = 0;
int chunk = 0;
byte[] data = new byte[256];
while(-1 != (chunk = in.read(data)))
{
read += data.length;
_copy.write(data, 0, chunk);
}
entriesStreamMap.put(entryName, _copy);
}
}
public InputStream getCopy(String entryName) {
ByteArrayOutputStream _copy = entriesStreamMap.get(entryName);
return (InputStream)new ByteArrayInputStream(_copy.toByteArray());
}
public static void main(String[] args) {
File jarFile = new File(“C:/users/yctongd/Desktop/fortest.jar”);
try {
InputStream in = new BufferedInputStream(new FileInputStream(jarFile));
ReadJar reader = new ReadJar(in);
reader.readEntries();
} catch (IOException e) {
e.printStackTrace();
}
}
//}
}