利用反射机制获得JavaBean的属性,然后生成一个XML文件.
//XmlFrame.java
package xmlgen.gui;
import java.awt.*;
import javax.swing.*;
public class XmlFrame extends JFrame{
public XmlFrame(){
this.setTitle("Xml Generator");
Toolkit kit=Toolkit.getDefaultToolkit();
Dimension d=kit.getScreenSize();
int width=d.width;
int height=d.height;
this.setLocation((width-800)/2,(height-600)/2);
this.setSize(800,600);
this.setContentPane(new XmlPanel());
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.show();
}
public static void main(String[] args){
new XmlFrame();
}
}
//XmlPanel.java
package xmlgen.gui;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
import java.util.*;
import xmlgen.core.*;
public class XmlPanel extends JPanel{
private JPanel midPane,classPane,propertyPane,elementPane;
private JPanel xmlPane;
private JTextArea xmlContent;
private JTextField txtPackage,txtClass,txtRoot,txtElement,txtProperty;
private JLabel lblPackage,lblClass,lblRoot,lblElement;
private JButton btnClass,btnDelPro,btnAddElement,btnDelElement,btnGen;
private JList lstClass,lstXml;
private DefaultListModel lmClass,lmXml;
private void init(){
this.setLayout(new BorderLayout());
classPane=new JPanel();
classPane.setBorder(BorderFactory.createCompoundBorder(
BorderFactory.createTitledBorder("类全名"),
BorderFactory.createEmptyBorder(5,5,5,5)));
this.lblPackage=new JLabel("类包名:");
this.lblClass=new JLabel("类名:");
this.txtPackage=new JTextField(20);
this.txtClass=new JTextField(20);
this.btnClass=new JButton("获得属性");
this.btnClass.setEnabled(false);
this.btnClass.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
String fullName=txtPackage.getText().trim()+"."+txtClass.getText().trim();
Class c=null;
xmlContent.setText("");
lmClass.clear();
try{
c=Class.forName(fullName);
}
catch(ClassNotFoundException ex){
xmlContent.setText("找不到指定的类，请确保环境变量设置正确");
return;
}
java.util.List list=Generator.getProperties(c);
for(int i=0;i<list.size();i++)
lmClass.addElement(list.get(i));
if(lmClass.size()==0)
xmlContent.setText("找不到任何属性");
}
}
);
this.txtClass.getDocument().addDocumentListener(
new AddTextListener(this.btnClass));
classPane.add(this.lblPackage);
classPane.add(this.txtPackage);
classPane.add(this.lblClass);
classPane.add(this.txtClass);
classPane.add(this.btnClass);
/*******************************************************************
*/
propertyPane=new JPanel(new BorderLayout());
propertyPane.setBorder(BorderFactory.createCompoundBorder(
BorderFactory.createTitledBorder("Bean 属性"),
BorderFactory.createEmptyBorder(5,5,5,5)));
this.lmClass =new DefaultListModel();
lmClass.addElement("这里是Bean的属性");
lmClass.addElement("点击上面的按钮可以生成");
lmClass.addElement("右边是XML中的属性");
lmClass.addElement("可以删除不必要的");
this.lstClass=new JList(this.lmClass);
this.lstClass.addListSelectionListener(new ListSelectionListener(){
public void valueChanged(ListSelectionEvent e) {
if (e.getValueIsAdjusting() == false) {
if (XmlPanel.this.lstClass.getSelectedIndex() == -1) {
//No selection, disable fire button.
XmlPanel.this.btnDelPro.setEnabled(false);
} else {
//Selection, enable the fire button.
XmlPanel.this.btnDelPro.setEnabled(true);
}
}
}
}
);
JScrollPane sp1=new JScrollPane(this.lstClass);
this.btnDelPro=new JButton("删除属性");
this.btnDelPro.setEnabled(false);
this.btnDelPro.addActionListener(new DelPropertyListener());
JPanel p1=new JPanel();
p1.add(this.btnDelPro);
propertyPane.add(sp1,BorderLayout.CENTER);
propertyPane.add(p1,BorderLayout.SOUTH);
/***************************************************************
*/
elementPane=new JPanel(new BorderLayout());
elementPane.setBorder(BorderFactory.createCompoundBorder(
BorderFactory.createTitledBorder("XML 元素属性"),
BorderFactory.createEmptyBorder(5,5,5,5)));
this.lmXml=new DefaultListModel();
this.lstXml=new JList(this.lmXml);
this.lstXml.addListSelectionListener(new ListSelectionListener(){
public void valueChanged(ListSelectionEvent e) {
if (e.getValueIsAdjusting() == false) {
if (XmlPanel.this.lstXml.getSelectedIndex() == -1) {
//No selection, disable fire button.
XmlPanel.this.btnDelElement.setEnabled(false);
} else {
//Selection, enable the fire button.
XmlPanel.this.btnDelElement.setEnabled(true);
}
}
}
}
);
JScrollPane sp2=new JScrollPane(this.lstXml);
this.btnDelElement=new JButton("删除");
this.btnDelElement.setEnabled(false);
this.btnDelElement.addActionListener(new DelElementListener());
this.txtProperty=new JTextField(15);
this.btnAddElement=new JButton("添加");
this.btnAddElement.setEnabled(false);
this.btnAddElement.addActionListener(new AddElement());
this.txtProperty.getDocument().addDocumentListener(
new AddTextListener(this.btnAddElement));
JPanel p2=new JPanel();
p2.add(this.btnDelElement);
p2.add(this.txtProperty);
p2.add(this.btnAddElement);
elementPane.add(sp2,BorderLayout.CENTER);
elementPane.add(p2,BorderLayout.SOUTH);
/***********************************************
*/
xmlPane=new JPanel(new BorderLayout());
xmlPane.setBorder(BorderFactory.createCompoundBorder(
BorderFactory.createTitledBorder("生成的 XML"),
BorderFactory.createEmptyBorder(5,5,5,5)));
this.xmlContent=new JTextArea(10,60);
this.xmlContent.setEditable(false);
this.lblRoot=new JLabel("根节点:");
this.lblElement=new JLabel("子节点名称:");
this.txtRoot=new JTextField("root",15);
this.txtElement=new JTextField("item",15);
this.btnGen=new JButton("生成XML");
DocumentListener dl=new AddTextListener(this.btnGen);
this.txtRoot.getDocument().addDocumentListener(dl);
this.txtElement.getDocument().addDocumentListener(dl);
this.btnGen.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
String root=txtRoot.getText().trim();
String element=txtElement.getText().trim();
if(root.equals("")) root="root";
if(element.equals("")) element="item";
String[] rows=new String[lmClass.size()];
for(int i=0;i<lmClass.size();i++)
rows[i]=(String)lmClass.getElementAt(i);
String[] pros =new String[lmXml.size()];
for(int i=0;i<lmXml.size();i++)
pros[i]=(String)lmXml.getElementAt(i);
String s=Generator.generateXml(root,element,rows,pros);
xmlContent.setText(s);
}
}
);
JScrollPane sp3=new JScrollPane(this.xmlContent);
JPanel p3=new JPanel();
p3.add(this.lblRoot);
p3.add(this.txtRoot);
p3.add(this.lblElement);
p3.add(this.txtElement);
p3.add(this.btnGen);
xmlPane.add(sp3,BorderLayout.CENTER);
xmlPane.add(p3,BorderLayout.SOUTH);
midPane=new JPanel(new GridLayout(1,1));
midPane.add(propertyPane);
midPane.add(elementPane);
//this.makeSize();
this.add(classPane,BorderLayout.NORTH);
this.add(midPane,BorderLayout.CENTER);
this.add(xmlPane,BorderLayout.SOUTH);
//this.add(new JLabel("Fuck"),BorderLayout.NORTH);
}
public XmlPanel(){
init();
}
class AddElement implements ActionListener{
public void actionPerformed(ActionEvent e){
String name =txtProperty.getText().trim();
//User didn't type in a unique name...
if (name.equals("") || lmXml.contains(name)) {
Toolkit.getDefaultToolkit().beep();
txtProperty.requestFocusInWindow();
txtProperty.selectAll();
return;
}
int index = lstXml.getSelectedIndex(); //get selected index
if (index == -1) { //no selection, so insert at beginning
index = 0;
} else { //add after the selected item
index++;
}
lmXml.insertElementAt(name.trim(), index);
//If we just wanted to add to the end, we'd do this:
//listModel.addElement(employeeName.getText());
//Reset the text field.
txtProperty.requestFocusInWindow();
txtProperty.setText("");
//Select the new item and make it visible.
lstXml.setSelectedIndex(index);
lstXml.ensureIndexIsVisible(index);
}
}
class AddTextListener implements DocumentListener {
private boolean alreadyEnabled = false;
private JButton button;
public AddTextListener(JButton button) {
this.button = button;
}
//Required by DocumentListener.
public void insertUpdate(DocumentEvent e) {
enableButton();
}
//Required by DocumentListener.
public void removeUpdate(DocumentEvent e) {
handleEmptyTextField(e);
}
//Required by DocumentListener.
public void changedUpdate(DocumentEvent e) {
if (!handleEmptyTextField(e)) {
enableButton();
}
}
private void enableButton() {
if (!alreadyEnabled) {
button.setEnabled(true);
}
}
private boolean handleEmptyTextField(DocumentEvent e) {
if (e.getDocument().getLength() <= 0) {
button.setEnabled(false);
alreadyEnabled = false;
return true;
}
return false;
}
}
class DelPropertyListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
//This method can be called only if
//there's a valid selection
//so go ahead and remove whatever's selected.
int[] index = lstClass.getSelectedIndices();
if(index.length==0) return;
for(int i=index.length-1;i>=0;i--)
lmClass.remove(index[i]);
int size = lmClass.getSize();
if (size == 0) { //Nobody's left, disable firing.
btnDelPro.setEnabled(false);
} else { //Select an index.
//removed item in last position
int pos=index[0]-1;
if(pos<0) pos=0;
lstClass.setSelectedIndex(pos);
lstClass.ensureIndexIsVisible(pos);
}
}
}
class DelElementListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
//This method can be called only if
//there's a valid selection
//so go ahead and remove whatever's selected.
int[] index = lstXml.getSelectedIndices();
if(index.length==0) return;
for(int i=index.length-1;i>=0;i--)
lmXml.remove(index[i]);
int size = lmXml.getSize();
if (size == 0) { //Nobody's left, disable firing.
btnDelElement.setEnabled(false);
} else { //Select an index.
//removed item in last position
int pos=index[0]-1;
if(pos<0) pos=0;
lstXml.setSelectedIndex(pos);
lstXml.ensureIndexIsVisible(pos);
}
}
}
}
//Generator.java
package xmlgen.core;
import java.util.*;
import java.lang.reflect.*;
public class Generator{
public static List getProperties(Class c){
Method[] ms=c.getMethods();
List list=new ArrayList();
String mn="";
String pro="";
for(int i=0;i<ms.length;i++){
if(ms[i].getParameterTypes().length!=0) continue;
mn=ms[i].getName();
if(mn.equals("getClass")) continue;
if(mn.startsWith("get")&&mn.length()>3){
pro=mn.substring(3,4).toLowerCase();
if(mn.length()>4) pro+=mn.substring(4);
list.add(pro);
}
}
return list;
}
private static String crln="\r\n";
public static String generateXml(String root,String element,String[] rows,String[] properties){
//
String pro="";
for(int i=0;i<properties.length;i++){
pro+=" "+properties[i]+"=\"\"";
}
String header="<"+element+" name=\"";
StringBuffer sb=new StringBuffer(100);
sb.append('<');
sb.append(root);
sb.append(">");
sb.append(crln);
for(int i=0;i<rows.length;i++){
sb.append('\t');
sb.append(header);
sb.append(rows[i]);
sb.append('\"');
sb.append(pro);
sb.append(" />");
sb.append(crln);
}
sb.append("</");
sb.append(root);
sb.append(">");
return sb.toString();
}
}
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