System.out.println()输出到文件

import java.io.FileNotFoundException;
import java.io.PrintStream;public class TestSystemOut {public static void main(String[] args) throws FileNotFoundException {System.setOut(new PrintStream("f:/test.txt"));System.out.println("Hello World");}}




输出到多个地方.

如: console和文件

import java.io.IOException;
import java.io.OutputStream;
import java.util.List;

import org.apache.commons.collections.CollectionUtils;

public class MultiOutputStream extends OutputStream {
	private List<OutputStream> outputStreams;

	public MultiOutputStream(List<OutputStream> outputStreams) throws IOException {
		super();

		if (CollectionUtils.isEmpty(outputStreams)) {
			throw new IOException("must set one OutputStream at least!");
		}

		this.outputStreams = outputStreams;
	}

	@Override
	public void write(int b) throws IOException {
		for (OutputStream outputStream : outputStreams) {
			outputStream.write(b);
		}
	}

}


			List<OutputStream> outputStreams = new ArrayList<OutputStream>();
			outputStreams.add(System.out);
			outputStreams.add(new FileOutputStream("../test.out"));
			MultiOutputStream multiOutputStream = new MultiOutputStream(outputStreams);
			System.setOut(new PrintStream(multiOutputStream));



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