0

我想知道是否有办法采取String- 让我们说：

String str = "blabla";

并做：

System.in.setText(str);

我知道这不起作用 - 我想知道是否有办法做到这一点。然后发送相同的字符串。就像您在控制台中写入并按 一样Enter。

它是一个带有服务器套接字的程序，我试图String通过一个端口发送一个，以便其他应用程序知道如何处理它。

编辑： 当用户在 Textfield 中写入时，我找到了一种将输入流重定向到 Textfield 的方法，它通过 System.in 发送它。

import java.io.*;
import javax.swing.*;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;

public class TextfieldInputStream extends InputStream implements DocumentListener {

    private JTextField tf;
    private String str = null;
    private int pos = 0;

    public TextfieldInputStream(JTextField jtf) {
        tf = jtf;
    }

    @Override
    public int read() {
        //test if the available input has reached its end
        //and the EOS should be returned 
        if(str != null && pos == str.length()){
            str = null;
            //this is supposed to return -1 on "end of stream"
            //but I'm having a hard time locating the constant
            return java.io.StreamTokenizer.TT_EOF;
        }
        //no input available, block until more is available because that's
        //the behavior specified in the Javadocs
        while (str == null || pos >= str.length()) {
            try {
                //according to the docs read() should block until new input is available
                synchronized (this) {
                    this.wait();
                }
            } catch (InterruptedException ex) {
                ex.printStackTrace();
            }
        }
        //read an additional character, return it and increment the index
        return str.charAt(pos++);
    }

    public void changedUpdate(DocumentEvent e) {
        // TODO Auto-generated method stub
    }

    public void insertUpdate(DocumentEvent e){
        str = tf.getText() + "\n";
        pos = 0;
        synchronized (this) {
            //maybe this should only notify() as multiple threads may
            //be waiting for input and they would now race for input
            this.notifyAll();
        }
    }

    public void removeUpdate(DocumentEvent e){
        // TODO Auto-generated method stub
    }
}
4

2 回答 2

5 
package test.t100.t007;

import java.io.ByteArrayInputStream;
import java.util.Scanner;

public class SystemIn {

    public static void main(String[] args) {
        String str = "blabla";
        ByteArrayInputStream bais = new ByteArrayInputStream(str.getBytes());
        System.setIn(bais);
        // We might use the ByteArrayInputStream here, but going with System.in..
        Scanner scanner = new Scanner(System.in);
        String input = scanner.next();
        System.out.println(input);
    }
}
于 2012-05-25T18:20:40.737 回答
4

您可以使用一PipedInputStream/PipedOutputStream对。然后你可以设置PipedInputStreamas System.inusingSystem.setIn()方法。最后，您可以写信给您PipedOutputStream并在 System.in 中获得结果。

于 2012-05-25T18:21:30.237 回答