在java程序中执行shell命令,改变文件的权限,可以在命令行中执行
chmod 777 <span style="font-family: Arial, Helvetica, sans-serif;">/data/misc/123.sh"</span>
来改变权限,但是在java代码中执行这个命令时使用
Runtime.getRuntime().exec("chmod 777 /data/misc/123.sh");
无效,使用
String[] command = new String[] {"/system/bin/sh","-c","chmod 777 /data/misc/123.sh"};
Runtime.getRuntime().exec(command);
同样无效
最后通过实例化一个dataoutputstream对象,在这个对象的写字节方法里写命令才实现,代码如下:
String[] commands = new String[] { "/system/bin/sh", "-c",
"chmod -R 777 /data/misc/123.sh" };
Process process = null;
DataOutputStream dataOutputStream = null;
try {
process = Runtime.getRuntime().exec("su");
dataOutputStream = new DataOutputStream(process.getOutputStream());
int length = commands.length;
for (int i = 0; i < length; i++) {
dataOutputStream.writeBytes(commands[i] + "\n");
}
dataOutputStream.writeBytes("exit\n");
dataOutputStream.flush();
process.waitFor();
} catch (Exception e) {
} finally {
try {
if (dataOutputStream != null) {
dataOutputStream.close();
}
process.destroy();
} catch (Exception e) {
}
}