我正在使用 Swing GUI 构建应用程序。如果您想从命令行打开这个程序,将会打印一些文本(信息和错误消息)。该程序只是一个普通的可执行 jar 文件,但对于想要查看控制台的人来说,我想要一个从Swing GUI 打开控制台的选项,它显示所有这些消息,由System.out.print()
. 我见过几个具有这种功能的应用程序,但我不知道如何做到这一点。
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基础知识在https://blogs.oracle.com/nickstephen/entry/java_redirecting_system_out_and进行了解释。该示例使用日志记录来重定向标准输出和标准错误。一个简单的方法可能是首先定义一个写入“控制台”的 OutputStream:
package outerr;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import javax.swing.JTextArea;
public class PrintOutErrStream extends ByteArrayOutputStream {
final int maxTextAreaSize = 1000;
private JTextArea textArea;
public PrintOutErrStream(JTextArea textArea) {
this.textArea = textArea;
}
public void flush() throws IOException {
synchronized(this) {
super.flush();
String outputStr = this.toString();
super.reset();
if(textArea.getText().length() > maxTextAreaSize) {
textArea.replaceRange("", 0, 100);
}
textArea.append(outputStr);
}
}
}
然后这是演示程序的剩余部分:
package outerr;
import java.io.PrintStream;
public class StdOutErr extends javax.swing.JFrame {
/** Creates new form StdOutErr */
public StdOutErr() {
initComponents();
PrintOutErrStream poes = new PrintOutErrStream(this.jTextAreaOutErrLog);
System.setErr(new PrintStream(poes, true));
System.setOut(new PrintStream(poes, true));
}
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this
* method is
* always regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
java.awt.GridBagConstraints gridBagConstraints;
jButtonStdout = new javax.swing.JButton();
jButtonStderr = new javax.swing.JButton();
jPanelOutErrLog = new javax.swing.JPanel();
jScrollPaneOutErrLog = new javax.swing.JScrollPane();
jTextAreaOutErrLog = new javax.swing.JTextArea();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
getContentPane().setLayout(new java.awt.FlowLayout());
jButtonStdout.setText("stdout");
jButtonStdout.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButtonStdoutActionPerformed(evt);
}
});
getContentPane().add(jButtonStdout);
jButtonStderr.setText("stderr");
jButtonStderr.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButtonStderrActionPerformed(evt);
}
});
getContentPane().add(jButtonStderr);
jTextAreaOutErrLog.setColumns(20);
jTextAreaOutErrLog.setRows(5);
jScrollPaneOutErrLog.setViewportView(jTextAreaOutErrLog);
javax.swing.GroupLayout jPanelOutErrLogLayout = new javax.swing.GroupLayout(jPanelOutErrLog);
jPanelOutErrLog.setLayout(jPanelOutErrLogLayout);
jPanelOutErrLogLayout.setHorizontalGroup(
jPanelOutErrLogLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 835, Short.MAX_VALUE)
.addGroup(jPanelOutErrLogLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPaneOutErrLog, javax.swing.GroupLayout.DEFAULT_SIZE, 835, Short.MAX_VALUE))
);
jPanelOutErrLogLayout.setVerticalGroup(
jPanelOutErrLogLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 378, Short.MAX_VALUE)
.addGroup(jPanelOutErrLogLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPaneOutErrLog, javax.swing.GroupLayout.DEFAULT_SIZE, 378, Short.MAX_VALUE))
);
getContentPane().add(jPanelOutErrLog);
pack();
}// </editor-fold>
private void jButtonStdoutActionPerformed(java.awt.event.ActionEvent evt) {
System.out.println("message via stdout");
}
private void jButtonStderrActionPerformed(java.awt.event.ActionEvent evt) {
System.err.println("message via stderr");
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(StdOutErr.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(StdOutErr.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(StdOutErr.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(StdOutErr.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new StdOutErr().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButtonStderr;
private javax.swing.JButton jButtonStdout;
private javax.swing.JPanel jPanelOutErrLog;
private javax.swing.JScrollPane jScrollPaneOutErrLog;
private javax.swing.JTextArea jTextAreaOutErrLog;
// End of variables declaration
}
于 2013-04-13T17:06:05.437 回答