Why Java JTextArea doesn't receive the entire pasted text?
使用 Netbeans 6.8 (Mac 版) 拖放工具制作 GUI，我设计了一个 JTextArea，用户应该粘贴他的数据，程序将修改并显示给他。
它工作正常；但是，当我尝试在 JTextArea 中粘贴大约 65000 行测试数据时，GUI 只显示其中几行(比如 50 行或更少)......由于某种原因，它拒绝粘贴我复制的整个测试数据来自记事本。
我以为 JTextArea 已满之类的，但是当我尝试手动输入更多文本时(粘贴测试数据后)，它正在输入并显示在文本框中！
知道发生了什么吗？
更新 001
我收到以下错误
1 |
更新 002
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 | package bossconverter; import org.jdesktop.application.Action; import org.jdesktop.application.ResourceMap; import org.jdesktop.application.SingleFrameApplication; import org.jdesktop.application.FrameView; import org.jdesktop.application.TaskMonitor; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.Timer; import javax.swing.Icon; import javax.swing.JDialog; import javax.swing.JFrame; /** * The application's main frame. */ public class BOSSConverterView extends FrameView { public BOSSConverterView(SingleFrameApplication app) { super(app); initComponents(); // status bar initialization - message timeout, idle icon and busy animation, etc ResourceMap resourceMap = getResourceMap(); int messageTimeout = resourceMap.getInteger("StatusBar.messageTimeout"); messageTimer = new Timer(messageTimeout, new ActionListener() { public void actionPerformed(ActionEvent e) { statusMessageLabel.setText(""); } }); messageTimer.setRepeats(false); int busyAnimationRate = resourceMap.getInteger("StatusBar.busyAnimationRate"); for (int i = 0; i < busyIcons.length; i++) { busyIcons[i] = resourceMap.getIcon("StatusBar.busyIcons[" + i +"]"); } busyIconTimer = new Timer(busyAnimationRate, new ActionListener() { public void actionPerformed(ActionEvent e) { busyIconIndex = (busyIconIndex + 1) % busyIcons.length; statusAnimationLabel.setIcon(busyIcons[busyIconIndex]); } }); idleIcon = resourceMap.getIcon("StatusBar.idleIcon"); statusAnimationLabel.setIcon(idleIcon); progressBar.setVisible(false); // connecting action tasks to status bar via TaskMonitor TaskMonitor taskMonitor = new TaskMonitor(getApplication().getContext()); taskMonitor.addPropertyChangeListener(new java.beans.PropertyChangeListener() { public void propertyChange(java.beans.PropertyChangeEvent evt) { String propertyName = evt.getPropertyName(); if ("started".equals(propertyName)) { if (!busyIconTimer.isRunning()) { statusAnimationLabel.setIcon(busyIcons[0]); busyIconIndex = 0; busyIconTimer.start(); } progressBar.setVisible(true); progressBar.setIndeterminate(true); } else if ("done".equals(propertyName)) { busyIconTimer.stop(); statusAnimationLabel.setIcon(idleIcon); progressBar.setVisible(false); progressBar.setValue(0); } else if ("message".equals(propertyName)) { String text = (String)(evt.getNewValue()); statusMessageLabel.setText((text == null) ?"" : text); messageTimer.restart(); } else if ("progress".equals(propertyName)) { int value = (Integer)(evt.getNewValue()); progressBar.setVisible(true); progressBar.setIndeterminate(false); progressBar.setValue(value); } } }); } @Action public void showAboutBox() { if (aboutBox == null) { JFrame mainFrame = BOSSConverterApp.getApplication().getMainFrame(); aboutBox = new BOSSConverterAboutBox(mainFrame); aboutBox.setLocationRelativeTo(mainFrame); } BOSSConverterApp.getApplication().show(aboutBox); } /** 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() { mainPanel = new javax.swing.JPanel(); jScrollPane1 = new javax.swing.JScrollPane(); jTextArea1 = new javax.swing.JTextArea(); jScrollPane2 = new javax.swing.JScrollPane(); jTextArea2 = new javax.swing.JTextArea(); jButton1 = new javax.swing.JButton(); menuBar = new javax.swing.JMenuBar(); javax.swing.JMenu fileMenu = new javax.swing.JMenu(); javax.swing.JMenuItem exitMenuItem = new javax.swing.JMenuItem(); javax.swing.JMenu helpMenu = new javax.swing.JMenu(); javax.swing.JMenuItem aboutMenuItem = new javax.swing.JMenuItem(); statusPanel = new javax.swing.JPanel(); javax.swing.JSeparator statusPanelSeparator = new javax.swing.JSeparator(); statusMessageLabel = new javax.swing.JLabel(); statusAnimationLabel = new javax.swing.JLabel(); progressBar = new javax.swing.JProgressBar(); mainPanel.setName("mainPanel"); // NOI18N jScrollPane1.setName("jScrollPane1"); // NOI18N jTextArea1.setColumns(20); jTextArea1.setRows(5); jTextArea1.setName("jTextArea1"); // NOI18N jScrollPane1.setViewportView(jTextArea1); jScrollPane2.setName("jScrollPane2"); // NOI18N jTextArea2.setColumns(20); jTextArea2.setRows(5); jTextArea2.setName("jTextArea2"); // NOI18N jScrollPane2.setViewportView(jTextArea2); org.jdesktop.application.ResourceMap resourceMap = org.jdesktop.application.Application.getInstance (bossconverter.BOSSConverterApp.class).getContext() .getResourceMap(BOSSConverterView.class); jButton1.setText(resourceMap.getString("jButton1.text")); // NOI18N jButton1.setName("jButton1"); // NOI18N jButton1.addMouseListener(new java.awt.event.MouseAdapter() { public void mouseClicked(java.awt.event.MouseEvent evt) { tester(evt); } }); org.jdesktop.layout.GroupLayout mainPanelLayout = new org.jdesktop.layout.GroupLayout(mainPanel); mainPanel.setLayout(mainPanelLayout); mainPanelLayout.setHorizontalGroup( mainPanelLayout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) .add(mainPanelLayout.createSequentialGroup() .addContainerGap() .add(mainPanelLayout.createParallelGroup(org.jdesktop.layout .GroupLayout.LEADING) .add(jScrollPane1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 383, Short.MAX_VALUE) .add(jScrollPane2, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 383, Short.MAX_VALUE) .add(org.jdesktop.layout.GroupLayout.TRAILING, jButton1)) .addContainerGap()) ); mainPanelLayout.setVerticalGroup( mainPanelLayout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING) .add(mainPanelLayout.createSequentialGroup() .addContainerGap() .add(jScrollPane1, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 98, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE) .add(18, 18, 18) .add(jScrollPane2, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 97, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE) .addPreferredGap(org.jdesktop.layout.LayoutStyle.UNRELATED) .add(jButton1) .addContainerGap(22, Short.MAX_VALUE)) ); menuBar.setName("menuBar"); // NOI18N fileMenu.setText(resourceMap.getString("fileMenu.text")); // NOI18N fileMenu.setName("fileMenu"); // NOI18N javax.swing.ActionMap actionMap = org.jdesktop.application.Application .getInstance(bossconverter.BOSSConverterApp .class).getContext().getActionMap (BOSSConverterView.class, this); exitMenuItem.setAction(actionMap.get("quit")); // NOI18N exitMenuItem.setName("exitMenuItem"); // NOI18N fileMenu.add(exitMenuItem); menuBar.add(fileMenu); helpMenu.setText(resourceMap.getString("helpMenu.text")); // NOI18N helpMenu.setName("helpMenu"); // NOI18N aboutMenuItem.setAction(actionMap.get("showAboutBox")); // NOI18N aboutMenuItem.setName("aboutMenuItem"); // NOI18N helpMenu.add(aboutMenuItem); menuBar.add(helpMenu); statusPanel.setName("statusPanel"); // NOI18N statusPanelSeparator.setName("statusPanelSeparator"); // NOI18N statusMessageLabel.setName("statusMessageLabel"); // NOI18N statusAnimationLabel.setHorizontalAlignment(javax.swing.SwingConstants.LEFT); statusAnimationLabel.setName("statusAnimationLabel"); // NOI18N progressBar.setName("progressBar"); // NOI18N org.jdesktop.layout.GroupLayout statusPanelLayout = new org.jdesktop.layout .GroupLayout(statusPanel); statusPanel.setLayout(statusPanelLayout); statusPanelLayout.setHorizontalGroup( statusPanelLayout.createParallelGroup(org.jdesktop.layout.GroupLayout .LEADING) .add(statusPanelSeparator, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 423, Short.MAX_VALUE) .add(statusPanelLayout.createSequentialGroup() .addContainerGap() .add(statusMessageLabel) .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED, 227, Short.MAX_VALUE) .add(progressBar, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE) .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED) .add(statusAnimationLabel) .addContainerGap()) ); statusPanelLayout.setVerticalGroup( statusPanelLayout.createParallelGroup(org.jdesktop.layout.GroupLayout .LEADING) .add(statusPanelLayout.createSequentialGroup() .add(statusPanelSeparator, org.jdesktop.layout.GroupLayout .PREFERRED_SIZE, 2, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE) .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .add(statusPanelLayout.createParallelGroup(org.jdesktop.layout .GroupLayout.BASELINE) .add(statusMessageLabel) .add(statusAnimationLabel) .add(progressBar, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)) .add(3, 3, 3)) ); setComponent(mainPanel); setMenuBar(menuBar); setStatusBar(statusPanel); }// </editor-fold> private void tester(java.awt.event.MouseEvent evt) { Converter converter = new Converter(); jTextArea2.setText(converter.fixParsedParagraph (jTextArea1.getText()) ); } // Variables declaration - do not modify private javax.swing.JButton jButton1; private javax.swing.JScrollPane jScrollPane1; private javax.swing.JScrollPane jScrollPane2; private javax.swing.JTextArea jTextArea1; private javax.swing.JTextArea jTextArea2; private javax.swing.JPanel mainPanel; private javax.swing.JMenuBar menuBar; private javax.swing.JProgressBar progressBar; private javax.swing.JLabel statusAnimationLabel; private javax.swing.JLabel statusMessageLabel; private javax.swing.JPanel statusPanel; // End of variables declaration private final Timer messageTimer; private final Timer busyIconTimer; private final Icon idleIcon; private final Icon[] busyIcons = new Icon[15]; private int busyIconIndex = 0; private JDialog aboutBox; } |
这是 netbeans 为我的 GUI 自动生成的代码。
那么里面有什么需要修复的吗？
Java 虚拟机采用两个命令行参数来设置初始和最大堆大小：
-Xms 和 -Xmx。例如，如果你想给你的 Java 程序一个 64Mb 的初始和 256Mb 的最大堆大小，你可以按如下方式启动它：
1 | java -Xms64m -Xmx256m my_prog |
这是我按照教程制作的示例。有了足够的堆空间，我可以粘贴超过 200,000 行。您是否错过了事件队列中的异常？
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | import javax.swing.*; import java.awt.*; public class JTextAreaPasteTest { private String testStr ="Paste text here."; public static void main(String argv[]) { EventQueue.invokeLater(new Runnable() { public void run() { new JTextAreaPasteTest(); } }); } public JTextAreaPasteTest () { JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JDialog.EXIT_ON_CLOSE); PasteArea wrapArea = new PasteArea("Paste text here."); frame.setLayout(new FlowLayout()); frame.add(new JScrollPane(wrapArea)); frame.pack(); frame.setVisible(true); } private static class PasteArea extends JTextArea { public PasteArea(String str) { super(str, 20, 40); this.setLineWrap(true); this.setWrapStyleWord(true); this.setCaretPosition(str.length()); } } } |