Sample1,利用Menifest文件讀取jar中的文件
/*
1.文件目錄
test--
--a.text
--b.gif
2. Menifest文件內容:
Manifest-Version: 1.0
abc: test/a.txt
iconname: test/Anya.jpg
注意:manifest.mf文件最后一行要打一回車
Another Notification:
如果manifest文件內容是:
Manifest-Version: 1.0
Main-Class: com.DesignToolApp
Class-path: lib/client.jar lib/j2ee.jar
在MANIFEST.MF文件的最后，要留兩個空行（也就是回車），才可以識別到Class-Path這一行，如果只有一個空行，那么只識別到Main-Class這一行。Class-Path中的庫名用空格格開，使用和jar包相對的路徑，發布時把jar包和其他用到的類庫一起交給用戶就可以了。
3.打jar包
test.jar
*/
String iconpath = jar.getManifest().getMainAttributes().getValue("abc");
InputStream in = jar.getInputStream(jar.getJarEntry(iconpath));
//Image img = ImageIO.read(in);
InputStreamReader isr = new InputStreamReader(in);
BufferedReader reader = new BufferedReader(isr);
String line;
while ((line = reader.readLine()) != null) {
System.out.println(line);
}
reader.close();
Sample2,讀取JAR 文件列表及各項的名稱、大小和壓縮后的大小
public class JarFileInfoRead {
public static void main (String args[])
throws IOException {
String jarpath="d://temp//test.jar";
JarFile jarFile = new JarFile(jarpath);
Enumeration enu = jarFile.entries();
while (enu.hasMoreElements()) {
process(enu.nextElement());
}
}
private static void process(Object obj) {
JarEntry entry = (JarEntry)obj;
String name = entry.getName();
long size = entry.getSize();
long compressedSize = entry.getCompressedSize();
System.out.println(name + "\t" + size + "\t" + compressedSize);
}
}
Sample3,讀取JAR中 文件的內容
public class JarFileRead {
public static void main (String args[])
throws IOException {
String jarpath="d://temp//test.jar";
JarFile jarFile = new JarFile(jarpath);
Enumeration enu = jarFile.entries();
while (enu.hasMoreElements()) {
JarEntry entry = (JarEntry)enu.nextElement();
String name = entry.getName();
//System.out.println(name);
if(name.equals("test/a.txt")){
InputStream input = jarFile.getInputStream(entry);
process(input);
}
}
jarFile.close();
}
private static void process(InputStream input)
throws IOException {
InputStreamReader isr =
new InputStreamReader(input);
BufferedReader reader = new BufferedReader(isr);
String line;
while ((line = reader.readLine()) != null) {
System.out.println(line);
}
reader.close();
}
}