当我加入system.out时。我的列表出现在控制台没问题。当我尝试将其发送到文件时，我收到错误说
javax.xml.bind.JAXBException
- with linked exception:
[java.io.FileNotFoundException: c:\computerparts.xml (Access is denied)]
at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(Unknown Source)
at com.cooksys.assessment.List$2.doSaveCommand(List.java:201)
at com.cooksys.assessment.List$2.actionPerformed(List.java:179).....ETC
在我的来源中，我没有收到任何错误。下面是我的保存（马歇尔）方法
JMenuItem mntmSave = new JMenuItem("Save");
mntmSave.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
doSaveCommand();
} catch (JAXBException e1) {
e1.printStackTrace();
}
}
private void doSaveCommand() throws JAXBException {
ArrayList<String> save = new ArrayList<>();
for (int i = 0; i < destination.size(); i++) {
save.add((String)destination.getElementAt(i));
}
ListWrapper Assembledparts = new ListWrapper();
Assembledparts.setAssembledparts (save);
File file = new File ("c:\\computerparts.xml");
JAXBContext context = JAXBContext.newInstance(ListWrapper.class);
Marshaller marshaller = context.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(Assembledparts, System.out);
marshaller.marshal(Assembledparts, file);
}
});
我希望如果我可以让我的列表显示在控制台中我应该能够编组到文件中。我错过了什么？下面是我的getter setter类
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class ListWrapper {
@XmlElement(name = "part")
private List<String> save;
public List<String> save() {
if (save == null) {
save = new ArrayList<String>();
}
return this.save;
}
public void setAssembledparts (ArrayList<String> save) {
this.save = save;
}
如果需要主代码在
之下import javax.swing.*;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import java.awt.*;
import java.awt.event.*;
import java.io.File;
import java.util.ArrayList;
public class List implements ActionListener{
JList destinationList, sourceList;
JButton buttonin, buttonout;
DefaultListModel source;
static DefaultListModel destination;
public JPanel createContentPane (){
JPanel totalGUI = new JPanel();
source = new DefaultListModel();
destination = new DefaultListModel();
String shoppingItems[] = {"Case", "Motherboard", "CPU", "RAM", "GPU",
"HDD", "PSU"};
for(int i = 0; i < shoppingItems.length; i++)
{
source.addElement(shoppingItems[i]);
}
destinationList = new JList(source);
destinationList.setVisibleRowCount(10);
destinationList.setFixedCellHeight(20);
destinationList.setFixedCellWidth(140);
destinationList.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
JScrollPane list1 = new JScrollPane(destinationList);
sourceList = new JList(destination);
sourceList.setVisibleRowCount(10);
sourceList.setFixedCellHeight(20);
sourceList.setFixedCellWidth(140);
sourceList.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
JScrollPane list2 = new JScrollPane(sourceList);
JPanel buttonPanel = new JPanel();
buttonin = new JButton(">>");
buttonin.setHorizontalAlignment(SwingConstants.RIGHT);
buttonin.addActionListener(this);
buttonPanel.add(buttonin);
JPanel bottomPanel = new JPanel();
bottomPanel.setLayout(new BoxLayout(bottomPanel, BoxLayout.LINE_AXIS));
bottomPanel.add(Box.createRigidArea(new Dimension(10,0)));
bottomPanel.add(list1);
bottomPanel.add(Box.createRigidArea(new Dimension(5,0)));
bottomPanel.add(buttonPanel);
buttonout = new JButton("<<");
buttonout.addActionListener(this);
buttonPanel.add(buttonout);
bottomPanel.add(Box.createRigidArea(new Dimension(5,0)));
bottomPanel.add(list2);
bottomPanel.add(Box.createRigidArea(new Dimension(10,0)));
totalGUI.add(bottomPanel);
totalGUI.setOpaque(true);
return totalGUI;
}
private JPanel createSquareJPanel(Color color, int size) {
JPanel tempPanel = new JPanel();
tempPanel.setBackground(color);
tempPanel.setMinimumSize(new Dimension(size, size));
tempPanel.setMaximumSize(new Dimension(size, size));
tempPanel.setPreferredSize(new Dimension(size, size));
return tempPanel;
}
public void actionPerformed(ActionEvent e)
{
int i = 0;
if(e.getSource() == buttonin)
{
int[] fromindex = destinationList.getSelectedIndices();
Object[] from = destinationList.getSelectedValues();
for(i = 0; i < from.length; i++)
{
destination.addElement(from[i]);
}
for(i = (fromindex.length-1); i >=0; i--)
{
source.remove(fromindex[i]);
}
}
else if(e.getSource() == buttonout)
{
Object[] to = sourceList.getSelectedValues();
int[] toindex = sourceList.getSelectedIndices();
for(i = 0; i < to.length; i++)
{
source.addElement(to[i]);
}
for(i = (toindex.length-1); i >=0; i--)
{
destination.remove(toindex[i]);
}
}
}
private static void createAndShowGUI() {
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new JFrame("PC Parts Builder");
JMenu file = new JMenu ("File");
List demo = new List();
frame.setContentPane(demo.createContentPane());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
JMenuBar menuBar = new JMenuBar();
frame.setJMenuBar(menuBar);
JMenu mnFile = new JMenu("File");
menuBar.add(mnFile);
JMenuItem item;
file.add(item = new JMenuItem("Load"));
item.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
doOpenCommand();
} catch (JAXBException e1) {
e1.printStackTrace();
}
}
private void doOpenCommand() throws JAXBException{
File file = new File ("c:\\computerparts.xml" );
JAXBContext context = JAXBContext.newInstance(ListWrapper.class);
Unmarshaller unmarshal = context.createUnmarshaller();
ListWrapper assembledparts = (ListWrapper) unmarshal.unmarshal(file);
System.out.println(assembledparts);
}
});
mnFile.add(item);
JMenuItem mntmSave = new JMenuItem("Save");
mntmSave.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
doSaveCommand();
} catch (JAXBException e1) {
e1.printStackTrace();
}
}
private void doSaveCommand() throws JAXBException {
ArrayList<String> save = new ArrayList<>();
for (int i = 0; i < destination.size(); i++) {
save.add((String)destination.getElementAt(i));
}
ListWrapper Assembledparts = new ListWrapper();
Assembledparts.setAssembledparts (save);
File file = new File ("c:\\computerparts.xml");
JAXBContext context = JAXBContext.newInstance(ListWrapper.class);
Marshaller marshaller = context.createMarshaller();
marshaller.setProperty (Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.marshal(Assembledparts, System.out);
marshaller.marshal(Assembledparts, file);
}
});
mnFile.add(mntmSave);
JMenuItem mntmNewMenuItem = new JMenuItem("Exit");
mntmNewMenuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
mnFile.add(mntmNewMenuItem);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
答案 0 :(得分：1)
[java.io.FileNotFoundException：c：\ computerparts.xml（访问被拒绝）]
尽量避免使用c：并将源文件放在另一个文件夹中，即。 C：/temp/FileName.xml
答案 1 :(得分：0)
这是要注意的路线：
[java.io.FileNotFoundException: c:\computerparts.xml (Access is denied)]
computerparts.xml不存在，或者您没有写入权限。将该文件放在其他位置，并更新行File file = new File ("c:\\computerparts.xml");以指向新文件位置。