如何更新预先存在的Jar文件

Question

我有一个WAR文件,我需要添加两个文件.目前,我这样做:

File war = new File(DIRECTORY, "server.war");
JarOutputStream zos = new JarOutputStream(new BufferedOutputStream(new FileOutputStream(war)));

//Add file 1
File file = new File(DIRECTORY, "file1.jar");
InputStream is = new BufferedInputStream(new FileInputStream(file));
ZipEntry e = new ZipEntry("file1.jar");
zos.putNextEntry(e);
byte[] buf = new byte[1024];
int len;
while ((len = is.read(buf, 0, buf.length)) != -1) {
    zos.write(buf, 0, len);
}
is.close();
zos.closeEntry();

//repeat for file 2

zos.close();

结果是前面的内容被破坏了:WAR只有我刚刚添加的2个文件.是否有某种追加模式,我没有使用或什么？

Answer 1

是的,FileOutputStream构造函数有一个额外的布尔参数,它允许你强制它附加到文件而不是覆盖它.将您的代码更改为

JarOutputStream zos = new JarOutputStream(new BufferedOutputStream(new FileOutputStream(war, True)));

它应该按照你想要的方式工作.