JTextArea没有显示所有单词

Question

我有GridgabLayout JPanel。我在里面放了4个组件，3个JLabel和1个JTextArea。最后一行是JTextArea组件。这个GridegabLayout面板被添加到另一个JPanelfor中。 JTextArea中的文本存在问题：

1. Text in JTextArea cannot show it all.
2. If there are too many word, the first two row of labels cannot see. 

在图片的右侧，我将文字改为多个单词。前两行消失了。

有我的GridgeabLayout JPanel代码：     包PDFAnnotationPackage;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.BoxLayout;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.JTextPane;



public class DivCommentJPane extends JPanel  {

private BeanPanel thisBean;
private CommentItem thisComment; 
private String pageErrorPrefix="Error On DivCommentJPane.java : "; 
private PDFNotes bean;  
private GridBagConstraints c;


public DivCommentJPane(CommentItem comment ,BeanPanel bean ){

    //thisBean=bean;
    super();        
    thisComment=comment;
    thisBean=test;
    setting();



}

public void setting(){
    try{
    bean=new PDFNotesBean();
    this.setLayout( new GridBagLayout());       
    c = new GridBagConstraints();
    c.anchor = GridBagConstraints.WEST;
    c.fill = GridBagConstraints.BOTH;
    c.weightx = 1.0;  // **** comment this line out to see effect ****
    c.weighty = 1.0;  // **** comment this line out to see effect ****




    buildTopJPane();
    setVisible(true);   
    }catch(Exception  err){
           Utility.DisplayErrorMsg(pageErrorPrefix+ err.getMessage().toString());
       }
}

private JLabel setAttonIconCreator(){
    Icon icon=getAnotIcon();
    JLabel lblAnottIcon=new JLabel(thisComment.creator, icon, JLabel.CENTER);   
    return lblAnottIcon;
}



private JLabel setDeleteIcon(){

    ImageIcon icon = new ImageIcon(getClass().getResource("Delete.gif"));
    JLabel lblDeleteIcon=new JLabel("", icon, JLabel.CENTER);   

    lblDeleteIcon.addMouseListener(new MouseAdapter()  
    {  
        public void mouseClicked(MouseEvent e)  
        {  

             thisBean.annotRemove(thisComment.annotation, thisComment.pageNum);             


        }  
    }); 
    return lblDeleteIcon;

}
private JLabel setPageDateLabel(){
    JLabel lblDate=new JLabel(thisComment.toString());
    return lblDate;
}

/*private JTextPane setContent(){

    JTextPane pane = new JTextPane();
    pane.setText(thisComment.content);
    pane.setEditable(false);



    return pane;

}*/

/*private JTextArea setContent(){
    JTextArea t=new JTextArea();
    t.setText(thisComment.content);
    t.setLineWrap(true);
    t.setEditable(false);
    return t;

}*/

//modified the code like to use JScrollPane
private JScrollPane setContent(){

    JScrollPane scroll=new JScrollPane();   
    scroll.setPreferredSize(new Dimension(250, 250));
    JTextArea t=new JTextArea(3,120);
    t.setText(thisComment.content);
    t.setLineWrap(true);
    t.setEditable(false);
    scroll.getViewport().add(t);
    return scroll;

}

private  void buildTopJPane(){
    JPanel lnFirst=new JPanel();
    try{


        c.gridx = 0;
        c.gridy = 0;       
        c.fill = GridBagConstraints.NONE;           
        this.add(setAttonIconCreator(), c);


        c.gridx = 5;
        c.gridy = 0;           
        this.add(setDeleteIcon(),c);

        c.gridx=0;
        c.gridy=1;
        c.gridwidth=4;
        this.add(setPageDateLabel(), c);

        c.gridx=0;
        c.gridy=2;
        c.gridwidth=4;             
        this.add(setContent(), c);






    } catch(Exception  err){
           Utility.DisplayErrorMsg(pageErrorPrefix+ err.getMessage().toString());
       }


}
@SuppressWarnings("finally")
private SafeIcon getAnotIcon(){
    SafeIcon  antIcon=null;
    try{
     switch (thisComment.type.toLowerCase()){
     case "underline":
         antIcon= new SafeIcon( bean.getAnnotToolbar().getjbTextUnderline().getIcon());
         break;
     case "squiggly":
         antIcon=new SafeIcon(bean.getjbTextSquiggly().getIcon());
         break;
     case "highlight":
         antIcon=new SafeIcon(bean.getjbHighlight().getIcon());
         break;
     case "note":
         antIcon=new SafeIcon(bean.getAnnotToolbar().getjbNote().getIcon());
     default:
         antIcon=new SafeIcon((Icon) ImageIO.read(getClass().getResource("SquigglyIcon.gif")));
         return antIcon;
     }
    }catch(IOException  err){
           Utility.DisplayErrorMsg(pageErrorPrefix+ err.getMessage().toString());


       }finally{return antIcon;}



}

}

这是在JScrollPane中添加JTextArea后的屏幕截图。