Question

用户在小程序中输入一个字符串然后将该字符串切割成较小的字符串并加载到数组A1中。列表框中的JList值显示在applet查看器中。但不在applet中。 JList在Panel2中。是什么阻止了applet中的值？

import java.awt.event.*;
import javax.swing.*;

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.LayoutManager;

import java.awt.FlowLayout;
import java.awt.Insets;
import java.awt.Font;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashSet;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

public class QueryWindow extends JApplet{

JTextField textField;
JButton button, button2; 
JLabel label, label2 ;
JList<String> listbox ;
JPanel thePanel;
JPanel Panel1, Panel2;
DefaultListModel<String> listModel;

public void init(){

GridBagLayout layout =new GridBagLayout();
thePanel = new JPanel();
thePanel.setLayout(layout);

GridBagConstraints gridConstraints = new GridBagConstraints();

定义组件的x，y位置使用了两个面板。 Panel2保存JList组件。

gridConstraints.gridx = 0;
gridConstraints.gridy = 0;

gridConstraints.gridwidth = 2;
gridConstraints.gridheight = 1;

gridConstraints.weightx = 10;
gridConstraints.weighty = 10;

gridConstraints.insets = new Insets(5,5,5,5);

gridConstraints.anchor = GridBagConstraints.CENTER;

gridConstraints.fill = GridBagConstraints.HORIZONTAL;

textField = new JTextField(" ", 60);
Font font =new Font("Helvetica", Font.PLAIN, 18);
textField.setFont(font);

button = new JButton("Enter Your Query");

label = new JLabel(" ");


thePanel.add(textField, gridConstraints);
gridConstraints.gridwidth = 1;
gridConstraints.gridx = 62;
thePanel.add(button, gridConstraints);
gridConstraints.gridwidth = 1;
gridConstraints.gridx = 1;
gridConstraints.gridy = 2;
thePanel.add(label, gridConstraints);

gridConstraints.gridwidth = 3;
gridConstraints.gridheight = 20;
gridConstraints.gridx = 1;
gridConstraints.gridy = 3;
gridConstraints.fill = GridBagConstraints.BOTH;  //BOTH


Panel2 = new JPanel((LayoutManager) new FlowLayout(FlowLayout.LEFT));
label2 = new JLabel("Annotations ");
Panel2.add(label2);  

listModel = new DefaultListModel<String>();
listbox = new JList<String>(listModel);  

listbox.setVisibleRowCount(10);

listbox.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

Panel2.add(new JScrollPane(listbox));  

thePanel.add(Panel2, gridConstraints);

创建一个将监视按钮单击的对象

GetResultsListener butListener = new GetResultsListener();
button.addActionListener(butListener);

this.add(thePanel);
this.setVisible(true);

}

按Query按钮调用基于REST的方法，切断长字符串。

class GetResultsListener implements ActionListener{

public void actionPerformed(ActionEvent e) {

String textFieldText = textField.getText();
ArrayList<String> A1 = new ArrayList<String>();
listModel.clear();   


textField.setText(textFieldText);

调用基于REST的代码来注释更长的字符串
queryToAnnotate方法返回数组A1中的字符串值。我强制打印A1的内容屏幕上。我将A1中的值分配给listModel。小程序查看器正确显示＆gt; JList中的值。但是小程序中的JList框是空的。

AnnotateQuery annotateQuery =new AnnotateQuery();

try {
     annotateQuery.queryToAnnotate(textFieldText, A1);

     for (int h=0; h<A1.size(); h++)

      {                 
          listModel.addElement(A1.get(h));    

      }


     } 
catch (UnsupportedEncodingException e1) {
        //         // TODO Auto-generated catch block
      e1.printStackTrace();
     }



Panel2.repaint();   
A1.clear();

}

}

}
}

JList值出现在applet查看器中，但不出现在applet中（在浏览器中）

0 个答案: