java 从 JTextarea 获取文本到 OutputStream 或将文本打印到控制台

Get text from JTextarea into OutputStream or print text into console

提问by Jithin Corleone

How to get text from JTextareainto OutputStreamor print text from JTextareainto console in Java?

如何从获取文本JTextarea进入OutputStream或打印文本JTextarea到控制台的Java？

import java.io.*;
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import java.net.*;

class Clients implements ActionListener
{
    JFrame fr;
    JPanel p1,p2;
    JTextArea asend,achat;
    JButton b1,b2;
    String s1;
    String f;

    Clients()
    {
        fr=new JFrame();
        fr.setLayout(new GridLayout(2,1));
        p1=new JPanel(new GridLayout(1,1));
        p2=new JPanel(new GridLayout(1,2));
        achat=new JTextArea(80,80);
        asend=new JTextArea(30,30);
        b1=new JButton("send");
        b2=new JButton("close");

        p1.add(new JScrollPane(achat));
        p2.add(asend);
        p2.add(b1);
        p1.setVisible(true);
        p2.setVisible(true);
        p1.setSize(400,300);
        p2.setSize(400,100);

        fr.add(p1);
        fr.add(p2);
        fr.setVisible(true);
        fr.setSize(400,400);
        b1.addActionListener(this);
    }

    public void actionPerformed(ActionEvent e)
    {
        if(e.getSource()==b1)
        { 
            s1 = asend.getText();
            appendData(s1);
            send();
            asend.setText( " ");
            set(s1);
        }
    }

    public void set(String a)
    {
        f=a;
    }

    public void appendData(String a)
    {
        String b=a;
        //get data from 'asned' textarea into 'achat' textarea
        achat.append( "\n SENT:      "+b);   
    }

    public String send()         
    {
        String h=f;
        //(return the value of string caught from textbox)  
        return(h);
    }

    public void setRec(String g)
    {
        String s2=g;
        achat.append("\n RECIEVED:       "+s2);
    }

    public static void main(String s[])
    {
        Clients d=new Clients();
        /*
         * object calls da method send 2 acesss non static 
         * data from static block of main method
         */
        String sendn=d.send();  
        try
        {
            Socket so=new Socket("169.254.121.33 ",255);
            DataInputStream inp=new DataInputStream(so.getInputStream());
            PrintStream outp=new PrintStream(so.getOutputStream());
            System.out.println(sendn);
            Boolean b=true;
            while(b)
            {
                String incomng=inp.readLine();
                d.setRec(incomng);    //incoming data is transferrd 
                System.out.println(incomng);
                outp.println(sendn);
                if(incomng==null)
                {
                    b=false;
                }
            }
        }
        catch(IOException ee)
        {
        }     
    }
}

The code first gets the data from JTextAreaachatby method set()..dn data from dis method is transferred into static block of main or console ..Main problem is that I am unable to get data from non static field of JTextAreain main method().

代码首先通过 set()..dn 方法从JTextAreaachat获取数据从 dis 方法传输到 main 或控制台的静态块..主要问题是我无法从JTextAreain main 方法的非静态字段中获取数据（ ）。

回答by Asd

Component.getText()This function returns a Stringwhatever is in that area after you have pressed the button or done some action.

Component.getText()String在您按下按钮或执行某些操作后，此函数会返回该区域中的任何内容。

JTextArea textArea = new JTextArea();
String s = textArea.getText();

回答by ryvantage

There are quite a few things to mention with your code, but to simply answer your question: You can get the data from the non-static field of textarea in main by using the Clientobject you created (d).

您的代码有很多东西要提及，但简单地回答您的问题：您可以使用Client您创建的对象 ( d)从 main 中 textarea 的非静态字段中获取数据。

So

所以

String achat_text = d.achat.getText();

would be sufficient to grab the text from the textarea in your main method.

就足以从您的主要方法中的 textarea 中获取文本。