我在jscrollpane中添加了jtextarea，但我不知道为什么它不起作用！ 你能帮我吗？
问题是我的文字出现了问题，但是在GUI中无法滚动。
我上传了所有代码，因为您可以轻松运行它，只需创建一个主文件＆amp;设定它的大小。你可以跟踪这些Jscrollpane的问题：jScrollPane1，jScrollPane16 jScrollPane4
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import com.borland.jbcl.layout.*;
public class Frame1 extends JFrame {
JPanel contentPane;
BorderLayout borderLayout1 = new BorderLayout();
JMenuBar jMenuBar1 = new JMenuBar();
JMenu jMenuFile = new JMenu();
JMenuItem jMenuFileExit = new JMenuItem();
JMenu jMenuHelp = new JMenu();
JMenuItem jMenuHelpAbout = new JMenuItem();
JToolBar jToolBar = new JToolBar();
JButton jButton1 = new JButton();
JButton jButton2 = new JButton();
JButton jButton3 = new JButton();
ImageIcon image1 = new ImageIcon(masterproject.Frame1.class.getResource(
"openFile.png"));
ImageIcon image2 = new ImageIcon(masterproject.Frame1.class.getResource(
"closeFile.png"));
ImageIcon image3 = new ImageIcon(masterproject.Frame1.class.getResource(
"help.png"));
JLabel statusBar = new JLabel();
JSplitPane jSplitPane1 = new JSplitPane();
JPanel jPanel1 = new JPanel();
JPanel jPanel2 = new JPanel();
DynamicTree jtProjectList = new DynamicTree();
BorderLayout borderLayout2 = new BorderLayout();
JToolBar jToolBar1 = new JToolBar();
JToolBar jToolBar2 = new JToolBar();
JButton jbAdd = new JButton();
JButton jbRemove = new JButton();
int newNodeSuffix = 0;
JToolBar jToolBar3 = new JToolBar();
BorderLayout borderLayout3 = new BorderLayout();
JPanel jpCore = new JPanel();
JPanel jpExclusion = new JPanel();
JLabel jLabel1 = new JLabel();
JTextArea jTextArea1 = new JTextArea();
BorderLayout borderLayout4 = new BorderLayout();
JTable jTable1 = new JTable();
JPanel jpScope = new JPanel();
JLabel jLabel2 = new JLabel();
JTextArea jTextArea2 = new JTextArea();
JTable jTable2 = new JTable();
BorderLayout borderLayout5 = new BorderLayout();
VerticalFlowLayout verticalFlowLayout1 = new VerticalFlowLayout();
JPanel jpDeliverable = new JPanel();
JTable jTable3 = new JTable();
JLabel jLabel3 = new JLabel();
JTextArea jTextArea3 = new JTextArea();
BorderLayout borderLayout6 = new BorderLayout();
JPanel jpAcceptance = new JPanel();
JPanel jpConstraints = new JPanel();
JPanel jpAssumption = new JPanel();
JPanel jpRisk = new JPanel();
BorderLayout borderLayout7 = new BorderLayout();
BorderLayout borderLayout8 = new BorderLayout();
BorderLayout borderLayout9 = new BorderLayout();
JTable jTable4 = new JTable();
JTable jTable5 = new JTable();
JTable jTable6 = new JTable();
JLabel jLabel4 = new JLabel();
JLabel jLabel5 = new JLabel();
JLabel jLabel6 = new JLabel();
JTextArea jTextArea4 = new JTextArea();
JTextArea jTextArea5 = new JTextArea();
JTextArea jTextArea6 = new JTextArea();
JLabel jLabel7 = new JLabel();
JTextArea jTextArea7 = new JTextArea();
JTable jTable7 = new JTable();
BorderLayout borderLayout10 = new BorderLayout();
JScrollPane jScrollPane1 = new JScrollPane();
JScrollPane jScrollPane2 = new JScrollPane();
JScrollPane jScrollPane3 = new JScrollPane();
JScrollPane jScrollPane4 = new JScrollPane();
JScrollPane jScrollPane5 = new JScrollPane();
JScrollPane jScrollPane6 = new JScrollPane();
JScrollPane jScrollPane7 = new JScrollPane();
JScrollPane jScrollPane8 = new JScrollPane();
JScrollPane jScrollPane9 = new JScrollPane();
JScrollPane jScrollPane10 = new JScrollPane();
JScrollPane jScrollPane11 = new JScrollPane();
JScrollPane jScrollPane12 = new JScrollPane();
JScrollPane jScrollPane13 = new JScrollPane();
JScrollPane jScrollPane14 = new JScrollPane();
JScrollPane jScrollPane15 = new JScrollPane();
JScrollPane jScrollPane16 = new JScrollPane();
public Frame1() {
try {
setDefaultCloseOperation(EXIT_ON_CLOSE);
jbInit();
} catch (Exception exception) {
exception.printStackTrace();
}
}
/**
* Component initialization.
*
* @throws java.lang.Exception
*/
private void jbInit() throws Exception {
contentPane = (JPanel) getContentPane();
contentPane.setLayout(borderLayout1);
this.setFont(new java.awt.Font("Tahoma", Font.BOLD, 14));
setSize(new Dimension(753, 483));
setTitle("Master Project");
statusBar.setText(" ");
jMenuFile.setText("File");
jMenuFileExit.setText("Exit");
jMenuFileExit.addActionListener(new Frame1_jMenuFileExit_ActionAdapter(this));
jMenuHelp.setText("Help");
jMenuHelpAbout.setText("About");
jMenuHelpAbout.addActionListener(new
Frame1_jMenuHelpAbout_ActionAdapter(this));
jPanel1.setLayout(borderLayout2);
jbAdd.setMaximumSize(new Dimension(51, 25));
jbAdd.setPreferredSize(new Dimension(51, 25));
jbAdd.setText("Add");
jbAdd.addActionListener(new Frame1_jbAdd_actionAdapter(this));
jbRemove.setText("Remove");
jbRemove.addActionListener(new Frame1_jbRemove_actionAdapter(this));
contentPane.setMinimumSize(new Dimension(400, 600));
contentPane.setPreferredSize(new Dimension(400, 600));
jSplitPane1.setMinimumSize(new Dimension(200, 55));
jSplitPane1.setPreferredSize(new Dimension(200, 355));
jSplitPane1.setLastDividerLocation(300);
jtProjectList.setPreferredSize(new Dimension(200, 324));
jPanel2.setLayout(borderLayout3);
jLabel1.setText("Exclusion :");
jTextArea1.setPreferredSize(new Dimension(280, 60));
jTextArea1.setText("jTextArea1");
jTextArea1.setLineWrap(true);
jpExclusion.setLayout(borderLayout4);
jLabel2.setText("Scope :");
jTextArea2.setPreferredSize(new Dimension(280, 60));
jTextArea2.setText("jTextArea1");
jTextArea2.setLineWrap(true);
jpScope.setLayout(borderLayout5);
jpCore.setLayout(verticalFlowLayout1);
jLabel3.setText("Deliverable :");
jTextArea3.setPreferredSize(new Dimension(280, 60));
jTextArea3.setText("jTextArea3");
jTextArea3.setLineWrap(true);
jpDeliverable.setLayout(borderLayout6);
jpAssumption.setLayout(borderLayout7);
jpConstraints.setLayout(borderLayout8);
jpAcceptance.setLayout(borderLayout9);
jLabel4.setText("Assumption :");
jLabel5.setText("Constraints :");
jLabel6.setText("Acceptance :");
jTextArea4.setMinimumSize(new Dimension(80, 18));
jTextArea4.setPreferredSize(new Dimension(280, 60));
jTextArea4.setText("jTextArea4");
jTextArea4.setLineWrap(true);
jTextArea5.setMinimumSize(new Dimension(80, 18));
jTextArea5.setPreferredSize(new Dimension(280, 60));
jTextArea5.setText("jTextArea5");
jTextArea5.setLineWrap(true);
jTextArea6.setMinimumSize(new Dimension(80, 18));
jTextArea6.setPreferredSize(new Dimension(280, 60));
jTextArea6.setText("jTextArea6");
jTextArea6.setLineWrap(true);
jpScope.setToolTipText("");
jLabel7.setText("Risk :");
jTextArea7.setPreferredSize(new Dimension(280, 60));
jTextArea7.setText("jTextArea7");
jTextArea7.setLineWrap(true);
jpRisk.setLayout(borderLayout10);
jpRisk.setMinimumSize(new Dimension(280, 60));
jScrollPane6.setPreferredSize(new Dimension(284, 44));
jScrollPane16.setPreferredSize(new Dimension(284, 44));
jScrollPane5.setPreferredSize(new Dimension(284, 44));
jScrollPane7.setPreferredSize(new Dimension(284, 44));
jScrollPane14.setPreferredSize(new Dimension(284, 44));
jScrollPane12.setPreferredSize(new Dimension(284, 44));
jScrollPane10.setPreferredSize(new Dimension(284, 44));
jScrollPane3.setVerticalScrollBarPolicy(JScrollPane.
VERTICAL_SCROLLBAR_ALWAYS);
jScrollPane9.setVerticalScrollBarPolicy(JScrollPane.
VERTICAL_SCROLLBAR_ALWAYS);
jScrollPane11.setVerticalScrollBarPolicy(JScrollPane.
VERTICAL_SCROLLBAR_ALWAYS);
jScrollPane13.setVerticalScrollBarPolicy(JScrollPane.
VERTICAL_SCROLLBAR_ALWAYS);
jScrollPane8.setVerticalScrollBarPolicy(JScrollPane.
VERTICAL_SCROLLBAR_ALWAYS);
jScrollPane4.setVerticalScrollBarPolicy(JScrollPane.
VERTICAL_SCROLLBAR_ALWAYS);
jScrollPane15.setVerticalScrollBarPolicy(JScrollPane.
VERTICAL_SCROLLBAR_ALWAYS);
jScrollPane1.setVerticalScrollBarPolicy(JScrollPane.
VERTICAL_SCROLLBAR_ALWAYS);
jMenuBar1.add(jMenuFile);
jMenuFile.add(jMenuFileExit);
jMenuBar1.add(jMenuHelp);
jMenuHelp.add(jMenuHelpAbout);
setJMenuBar(jMenuBar1);
jButton1.setIcon(image1);
jButton1.setToolTipText("Open File");
jButton2.setIcon(image2);
jButton2.setToolTipText("Close File");
jButton3.setIcon(image3);
jButton3.setToolTipText("Help");
jToolBar.add(jButton1);
jToolBar.add(jButton2);
jToolBar.add(jButton3);
contentPane.add(statusBar, BorderLayout.SOUTH);
contentPane.add(jSplitPane1, java.awt.BorderLayout.CENTER);
jSplitPane1.add(jPanel1, JSplitPane.LEFT);
jSplitPane1.add(jPanel2, JSplitPane.RIGHT);
jToolBar1.add(jtProjectList);
jPanel1.add(jToolBar1, java.awt.BorderLayout.CENTER);
jPanel1.add(jToolBar2, java.awt.BorderLayout.NORTH);
jToolBar2.add(jbAdd);
jToolBar2.add(jbRemove);
jPanel2.add(jToolBar3, java.awt.BorderLayout.CENTER);
jToolBar3.add(jScrollPane3);
jScrollPane3.getViewport().add(jpCore);
jpScope.add(jScrollPane1, java.awt.BorderLayout.CENTER);
jScrollPane1.getViewport().add(jTextArea2);
jScrollPane16.getViewport().add(jTable1);
jScrollPane14.getViewport().add(jTable5);
jScrollPane12.getViewport().add(jTable6);
jScrollPane10.getViewport().add(jTable7);
jScrollPane8.getViewport().add(jTextArea4);
jScrollPane6.getViewport().add(jTable2);
jScrollPane5.getViewport().add(jTable3);
jScrollPane4.getViewport().add(jTextArea3);
contentPane.add(jToolBar, java.awt.BorderLayout.NORTH);
jpDeliverable.add(jScrollPane4, java.awt.BorderLayout.CENTER);
jpDeliverable.add(jScrollPane5, java.awt.BorderLayout.SOUTH);
jpDeliverable.add(jLabel3, java.awt.BorderLayout.NORTH);
jpScope.add(jScrollPane6, java.awt.BorderLayout.SOUTH);
jpScope.add(jLabel2, java.awt.BorderLayout.NORTH);
jScrollPane7.getViewport().add(jTable4);
jpAcceptance.add(jLabel6, java.awt.BorderLayout.NORTH);
jScrollPane9.getViewport().add(jTextArea7);
jpRisk.add(jScrollPane10, java.awt.BorderLayout.SOUTH);
jpRisk.add(jScrollPane9, java.awt.BorderLayout.CENTER);
jpRisk.add(jLabel7, java.awt.BorderLayout.NORTH);
jScrollPane11.getViewport().add(jTextArea6);
jpAssumption.add(jLabel4, java.awt.BorderLayout.NORTH);
jpAssumption.add(jScrollPane12, java.awt.BorderLayout.SOUTH);
jpAssumption.add(jScrollPane11, java.awt.BorderLayout.CENTER);
jScrollPane13.getViewport().add(jTextArea5);
jpConstraints.add(jLabel5, java.awt.BorderLayout.NORTH);
jpConstraints.add(jScrollPane14, java.awt.BorderLayout.SOUTH);
jpConstraints.add(jScrollPane13, java.awt.BorderLayout.CENTER);
jScrollPane15.getViewport().add(jTextArea1);
jpExclusion.add(jLabel1, java.awt.BorderLayout.NORTH);
jpExclusion.add(jScrollPane16, java.awt.BorderLayout.SOUTH);
jpExclusion.add(jScrollPane15, java.awt.BorderLayout.CENTER);
jpAcceptance.add(jScrollPane8, java.awt.BorderLayout.CENTER);
jpAcceptance.add(jScrollPane7, java.awt.BorderLayout.SOUTH);
jpCore.add(jpScope, 0);
jpCore.add(jpExclusion, 1);
jpCore.add(jpDeliverable, 2);
jpCore.add(jpAcceptance, 3);
jpCore.add(jpConstraints, 4);
jpCore.add(jpAssumption, 5);
jpCore.add(jpRisk, 6);
jSplitPane1.setDividerLocation(230);
}
/**
* File | Exit action performed.
*
* @param actionEvent ActionEvent
*/
void jMenuFileExit_actionPerformed(ActionEvent actionEvent) {
System.exit(0);
}
/**
* Help | About action performed.
*
* @param actionEvent ActionEvent
*/
void jMenuHelpAbout_actionPerformed(ActionEvent actionEvent) {
Frame1_AboutBox dlg = new Frame1_AboutBox(this);
Dimension dlgSize = dlg.getPreferredSize();
Dimension frmSize = getSize();
Point loc = getLocation();
dlg.setLocation((frmSize.width - dlgSize.width) / 2 + loc.x,
(frmSize.height - dlgSize.height) / 2 + loc.y);
dlg.setModal(true);
dlg.pack();
dlg.setVisible(true);
}
public void jbRemove_actionPerformed(ActionEvent actionEvent) {
jtProjectList.removeCurrentNode();
}
public void jbAdd_actionPerformed(ActionEvent actionEvent) {
String response = "";
while(response.trim().equals("")){
response = JOptionPane.showInputDialog(this,
"Please enter name of node?",
"Enter your name",
JOptionPane.QUESTION_MESSAGE);
//System.out.println(response);
if( response != null && response.trim().equals(""))
JOptionPane.showMessageDialog(this,"Please enter valid name",
"Error",JOptionPane.ERROR_MESSAGE);
}
jtProjectList.addObject(response);
}
}
class Frame1_jbAdd_actionAdapter implements ActionListener {
private Frame1 adaptee;
Frame1_jbAdd_actionAdapter(Frame1 adaptee) {
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent actionEvent) {
adaptee.jbAdd_actionPerformed(actionEvent);
}
}
class Frame1_jbRemove_actionAdapter implements ActionListener {
private Frame1 adaptee;
Frame1_jbRemove_actionAdapter(Frame1 adaptee) {
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent actionEvent) {
adaptee.jbRemove_actionPerformed(actionEvent);
}
}
class Frame1_jMenuFileExit_ActionAdapter implements ActionListener {
Frame1 adaptee;
Frame1_jMenuFileExit_ActionAdapter(Frame1 adaptee) {
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent actionEvent) {
adaptee.jMenuFileExit_actionPerformed(actionEvent);
}
}
class Frame1_jMenuHelpAbout_ActionAdapter implements ActionListener {
Frame1 adaptee;
Frame1_jMenuHelpAbout_ActionAdapter(Frame1 adaptee) {
this.adaptee = adaptee;
}
public void actionPerformed(ActionEvent actionEvent) {
adaptee.jMenuHelpAbout_actionPerformed(actionEvent);
}
}
答案 0 :(得分：4)
我认为你的代码如此混乱的原因是因为它是由一些GUI构建器自动生成的。由于组件数量众多且界面复杂，您可能需要手动编写。这里必须有某种模式，您可以利用它来减少代码量并使其更易于理解和维护。
除此之外，我认为问题可能归结为组件被“添加”到JScrollPane的方式。你用过
jScrollPaneX.getViewport().add(comp);
这不是将视图分配给滚动窗格的常用方法。标准方法是在构造时选择视图组件，例如通过调用
jScrollPanex = new JScrollPane(comp)
或者如果您需要稍后再设置，请致电
jScrollPaneX.setViewportView(comp)。
（在内部，这会调用getViewport().setView(view)，它与您的方式类似，但不一样。）
答案 1 :(得分：-2)
我通过对我的代码进行小规模审核解决了我的问题：
我只是删除了这一行：
jTextArea1.setPreferredSize(new Dimension(280, 60));
不要忘记，如果您为Jtextarea设置尺寸（任何尺寸），滚动窗格将不会出现在屏幕上：）
完成工作，享受它......