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程序问答发布时间：2022-06-01 发布网站：大佬教程 code.js-code.com

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如何解决显示从一类到 GUI 类的文本？

开发过程中遇到显示从一类到 GUI 类的文本的问题如何解决？下面主要结合日常开发的经验，给出你关于显示从一类到 GUI 类的文本的解决方法建议，希望对你解决显示从一类到 GUI 类的文本有所启发或帮助；

我是 Java 新手，我有这段代码，我用它来使用套接字连接到服务器

客户端类代码

@H_675_6@

public class ClIEnt {
    Socket mysocket;
    BufferedReader inFromServer;
    DataOutputStream outToServer;
    
        public Socket connect(String nameServer,int portServer) {
            try 
            {
                mysocket=new Socket(nameServer,portServer);
                outToServer=new DataOutputStream(mysocket.getoutputStream());
                inFromServer=new BufferedReader(new inputStreamReader(mysocket.geTinputStream()));
            }
            catch(UnkNownHostException E) 
            {
                System.err.println("Host error"); // display Error
            }
            catch(Exception E)
            {
                System.out.print(e.getmessage());
                System.out.print("Connection Error!"); // display Error
                System.exit(1);
            }
            return mysocket;
        }

界面代码

@H_675_6@

package ClIEnt;

import java.awt.EventQueue;

import javax.swing.text.badLOCATIOnException;
import javax.swing.text.Style;
import javax.swing.text.StyleConstants;
import javax.swing.text.Styleddocument;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.color;
import java.awt.Systemcolor;
import javax.swing.JTextFIEld;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import java.awt.Font;
import javax.swing.Jbutton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JTextPane;

public class WindowClIEnt {

    private JFrame frmSocketConnection;
    private JTextFIEld TxtIP;
    private JTextFIEld TxtPort;
    private JTextFIEld TxTinput;

    ClIEnt clIEnt = new ClIEnt();
    
    public static Boolean isNumeric(String strNum) {
        if (strNum == null) {
            return false;
        }
        try {
            double d = Double.parseDouble(strNum);
        } catch (numberFormatException nfE) {
            return false;
        }
        return true;
    }
    
    
    public static voID main(String[] args) {
        EventQueue.invokelater(new Runnable() {
            public voID run() {
                try {
                    WindowClIEnt window = new WindowClIEnt();
                    window.frmSocketConnection.setVisible(true);
                } catch (Exception E) {
                    e.printstacktrace();
                }
            }
        });
    }

    /**
     * Create the application.
     */
    public WindowClIEnt() {
        initialize();
    }

    /**
     * Initialize the contents of the frame.
     */
    private voID initialize() {
        frmSocketConnection = new JFrame();
        frmSocketConnection.settitle("Socket Connection");
        frmSocketConnection.getContentPane().setBACkground(color.WHITE);
        frmSocketConnection.setBounds(100,100,983,633);
        frmSocketConnection.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
        frmSocketConnection.getContentPane().setLayout(null);
        
        JPanel panel = new JPanel();
        panel.setBACkground(color.WHITE);
        panel.setBounds(725,244,596);
        frmSocketConnection.getContentPane().add(panel);
        panel.setLayout(null);
        
        TxtIP = new JTextFIEld();
        TxtIP.setFont(new Font("Tahoma",Font.PLAIN,16));
        TxtIP.setBounds(10,89,224,34);
        panel.add(TxtIp);
        TxtIP.setcolumns(10);
        
        JLabel lbliP = new JLabel("IP Address");
        lbliP.setFont(new Font("Tahoma",Font.bolD,18));
        lbliP.setHorizontalAlignment(SwingConstants.CENTER);
        lbliP.setBounds(10,45,34);
        panel.add(lblip);
        
        TxtPort = new JTextFIEld();
        TxtPort.setFont(new Font("Tahoma",16));
        TxtPort.setcolumns(10);
        TxtPort.setBounds(10,216,34);
        panel.add(TxtPort);
        
        JLabel lblPort = new JLabel("IP Port");
        lblPort.setHorizontalAlignment(SwingConstants.CENTER);
        lblPort.setFont(new Font("Tahoma",18));
        lblPort.setBounds(10,172,34);
        panel.add(lblPort);
        
        Jbutton btnConnect = new Jbutton("Connect");
        btnConnect.setFocusPainted(false);
        btnConnect.setBACkground(Systemcolor.controlHighlight);
        btnConnect.setFont(new Font("Tahoma",18));
        btnConnect.setBounds(34,317,176,48);
        panel.add(btnConnect);
        
        Jbutton btndisconnect = new Jbutton("disconnect");
        btndisconnect.setFocusPainted(false);
        btndisconnect.setEnabled(false);
        btndisconnect.setFont(new Font("Tahoma",18));
        btndisconnect.setBACkground(Systemcolor.controlHighlight);
        btndisconnect.setBounds(34,396,48);
        panel.add(btndisconnect);
        
        TxTinput = new JTextFIEld();
        TxTinput.setFont(new Font("Tahoma",16));
        TxTinput.setForeground(color.WHITE);
        TxTinput.setBACkground(color.DARK_GRAY);
        TxTinput.setBounds(10,547,617,39);
        frmSocketConnection.getContentPane().add(TxTinput);
        TxTinput.setcolumns(10);
        
        Jbutton btnEnter = new Jbutton("Enter");
        btnEnter.setFocusPainted(false);
        btnEnter.setBACkground(Systemcolor.controlHighlight);
        btnEnter.setFont(new Font("Tahoma",18));
        btnEnter.setBounds(623,92,39);
        frmSocketConnection.getContentPane().add(btnEnter);
        
        JTextPane TxtConsole = new JTextPane();
        Styleddocument doc = TxtConsole.getStyleddocument();
        Style style = TxtConsole.addStyle("Stile",null);
        TxtConsole.setFont(new Font("Monospaced",16));
        TxtConsole.setForeground(color.WHITE);
        TxtConsole.setBACkground(color.DARK_GRAY);
        TxtConsole.setBounds(10,10,705,525);
        frmSocketConnection.getContentPane().add(TxtConsolE);
        
        btnConnect.addActionListener(new ActionListener() {
            public voID actionPerformed(ActionEvent E) {
                btnConnect.setEnabled(false);
                btndisconnect.setEnabled(true);
                if (TxtIP.getText().length() == 0 || TxtPort.getText().length() == 0) {
                    StyleConstants.setForeground(style,color.red);
                    try {
                        doc.insertString(doc.getLength(),"Error. One fIEld is empty! \n",stylE);
                        btnConnect.setEnabled(true);
                        btndisconnect.setEnabled(false);
                    } catch (BadLOCATIOnException e1) {
                        e1.printstacktrace();
                    }
                }
                
                else if (!isNumeric(TxtPort.getText())) {
                    StyleConstants.setForeground(style,"The port fIEld has to be a number! \n",stylE);
                        btnConnect.setEnabled(true);
                        btndisconnect.setEnabled(false);
                    } catch (BadLOCATIOnException e1) {
                        e1.printstacktrace();
                    }
                }

                else {
                    StyleConstants.setForeground(style,color.whitE);
                     try {
                            doc.insertString(doc.getLength(),"Connection... \n",stylE);
                        } catch (BadLOCATIOnException e1) {
                            e1.printstacktrace();
                        }
                }
                
            }
        });
        
        TxTinput.addActionListener(new ActionListener() {
            @OverrIDe
            public voID actionPerformed(ActionEvent E) {
                TxTinput.setText("");
            }
        });
        
        btnEnter.addActionListener(new ActionListener() {
            public voID actionPerformed(ActionEvent E) {
            }
        });
        
        btndisconnect.addActionListener(new ActionListener() {
            public voID actionPerformed(ActionEvent E) {
                TxtIP.setText("");
                TxtPort.setText("");
            }
        });
    }
}

我在另一个班级有一个 GUI。在该课程中，我有一个 JTextPane，我想将其用作显示任何内容的“控制台”

This is an image of the GUI that i have at the moment

我想将来自 ClIEnt 类的错误字符串显示到 JTextPane 中，它在另一个类中，但我真的不知道该怎么做

解决方法

有很多方法可以在数据之间进行通信并确保通过它。您可以选择从 Client 类中抛出错误/异常并确保捕获它并将该错误放入 JTextPane

我可以简单地尝试一下：

@H_675_6@

public static class Client {
    Socket mysocket;
    BufferedReader inFromServer;
    DataOutputStream outToServer;

    public Socket connect(String nameServer,int portServer) throws Exception {
        try
        {
            mysocket=new Socket(nameServer,portServer);
            outToServer=new DataOutputStream(mysocket.getOutputStream());
            inFromServer=new BufferedReader(new InputStreamReader(mysocket.geTinputStream()));
        }
        catch(UnknownHostException E)
        {
            throw new Exception("Unknown Host Error: " + e.getmessage());
        }
        catch(Exception E)
        {
            System.out.print("Connection Error!"); // Display Error
            throw new Exception("Connection Error! " + e.getmessage());
        }
        return mysocket;
    }
}

一个非常简单的版本是：

@H_675_6@

    Client c = new Client();
    String errormessage = "";
    try {
        c.connect("localhost",8010);
    } catch (Exception E) {
        errormessage = e.getmessage();
    }

    JTextPane pane = new JTextPane();
    SimpleAttributeSet attributeSet = new SimpleAttributeSet();
    StyleConstants.setBold(attributeSet,truE);

    // Set the attributes before adding text
    pane.setCharacterAttributes(attributeSet,truE);

    // A very simple version of that errormessage for illustrations only 
    pane.setText(errormessage == null ? "Welcome" : errormessagE);

就您而言，如果您通过按钮操作进行连接，则：

@H_675_6@

   btnConnect.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent E) {
            btnConnect.setEnabled(false);
            btnDisconnect.setEnabled(true);
            
            // if-else
            // ...
            else {
                StyleConstants.setForeground(style,Color.whitE);
                try {

                    Client c = new Client();
                    String errormessage = "";
                    try {
                        c.connect("localhost",8010);
                        doc.insertString(doc.getLength(),"ConnecTing...",stylE);
                    } catch (Exception E) {
                        // SetTing the error message
                        doc.insertString(doc.getLength(),e.getmessage(),stylE);
                    }
                } catch (BadLOCATIOnException e1) {
                    e1.printStackTrace();
                }
            }

        }
    });

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