我想将System.out
条消息写入另一个OutputStream
,但我仍然希望获得标准输出。
我找到了关于此类问题的答案Copy and Redirecting System.err Stream:
简而言之,您需要做的是定义一个可以复制其输出的PrintStream,使用以下命令进行分配:
System.setErr(doubleLoggingPrintStream)
这是我到目前为止所做的:
public class DoublerPrintStream extends PrintStream {
private OutputStream forwarder;
public DoublerPrintStream(OutputStream target, OutputStream forward) {
super(target, true);
this.forwarder = forward;
}
@Override
public void write(byte[] b) throws IOException {
try {
synchronized (this) {
super.write(b);
forwarder.write(b);
forwarder.flush();
}
}
catch (InterruptedIOException x) {
Thread.currentThread().interrupt();
}
catch (IOException x) {
}
}
@Override
public void write(byte[] buf, int off, int len) {
try {
synchronized (this) {
super.write(buf, off, len);
forwarder.write(buf, off, len);
forwarder.flush();
}
}
catch (InterruptedIOException x) {
Thread.currentThread().interrupt();
}
catch (IOException x) {
}
}
@Override
public void write(int b) {
try {
synchronized (this) {
super.write(b);
forwarder.write(b);
forwarder.flush();
}
}
catch (InterruptedIOException x) {
Thread.currentThread().interrupt();
}
catch (IOException x) {
}
}
@Override
public void flush() {
super.flush();
try { forwarder.flush(); } catch (IOException e) { }
}
@Override
public void close() {
super.close();
if (forwarder != null) {
try {
forwarder.close();
} catch (Exception e) {}
}
}
}
}
这只是一个草案,但这是一个好方法吗?我是否有一种更好的解决方案无能为力,所以我正在寻找确认,想法和建议。