学习Java的Swing的时候写的一个超简单文件浏览器

效果如图：

项目结构：

这里面主要用了两个控件，JTree和JTable

下面先说下左侧的文件树如何实现：

首先是FileTree类，继承于JTree类，这里实现了树节点展开，和鼠标移动事件响应

package FileTree;

import java.awt.Rectangle;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.io.File;

import javax.swing.JTree;

import javax.swing.event.TreeExpansionEvent;

import javax.swing.event.TreeWillExpandListener;

import javax.swing.filechooser.FileSystemView;

import javax.swing.tree.ExpandVetoException;

import javax.swing.tree.TreePath;

/**

 * Created by Administrator on 2016/3/29.

 */

public class FileTree extends JTree {

	private static final long serialVersionUID = 1L;

	public TreePath mouseInPath;

    static protected FileSystemView fileSystemView = FileSystemView.getFileSystemView();

    public FileTree() {

        setRootVisible(false);

        addTreeWillExpandListener(new TreeWillExpandListener(){

            @Override

            public void treeWillExpand(TreeExpansionEvent event) throws ExpandVetoException {

                FileTreeNode fileNode = (FileTreeNode)event.getPath().getLastPathComponent();

                if (!fileNode.isInit()){

                    File[] files;

                    if(fileNode.isDummyRoot()) {

                        files = fileSystemView.getRoots();

                    } else {

                        files = fileSystemView.getFiles(fileNode.getFile(), false);

                    }

                    for (int i = 0; i < files.length; i++){

                        if (files[i].isDirectory())

                        {

                            FileTreeNode childFileNode = new FileTreeNode(files[i]);

                            fileNode.add(childFileNode);

                        }

                    }

                }

                fileNode.setInit(true);

            }

            @Override

            public void treeWillCollapse(TreeExpansionEvent event) throws ExpandVetoException {

            }

        });

        addMouseMotionListener(new MouseAdapter() {

            @Override

            public void mouseMoved(MouseEvent e) {

                TreePath path = getPathForLocation(e.getX(), e.getY());

                if (path != null) {

                    if (mouseInPath != null) {

                        Rectangle oldRect = getPathBounds(mouseInPath);

                        mouseInPath = path;

                        repaint(getPathBounds(path).union(oldRect));

                    } else {

                        mouseInPath = path;

                    }

                } else if (mouseInPath != null) {

                    Rectangle oldRect =getPathBounds(mouseInPath);

                    mouseInPath = null;

                    repaint(oldRect);

                }

            }

        });

    }

}

FileTreeCellRenderer继承自DefaultTreeCellRenderer， 负责树节点显示渲染，这里主要是需要重载getTreeCellRendererComponent()方法

package FileTree;

import java.awt.Color;

import java.awt.Component;

import java.io.File;

import javax.swing.JLabel;

import javax.swing.JTree;

import javax.swing.plaf.ColorUIResource;

import javax.swing.tree.DefaultTreeCellRenderer;

/**

 * Created by Administrator on 2016/3/29.

 */

public class FileTreeCellRenderer extends  DefaultTreeCellRenderer {

	private static final long serialVersionUID = 1L;

	public FileTreeCellRenderer(){

    }

    @Override

    public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {

        FileTree fileTree = (FileTree) tree;

        FileTreeNode fileNode = (FileTreeNode) value;

        File file = (File) fileNode.getUserObject();

        JLabel label = (JLabel)super.getTreeCellRendererComponent(tree,value,selected,expanded,leaf,row,hasFocus);

        label.setText(fileNode.getFileName());

        label.setIcon(fileNode.getFileIcon());

        label.setOpaque(false);

        if (fileTree.mouseInPath != null &&

                fileTree.mouseInPath.getLastPathComponent().equals(value)) {

            label.setOpaque(true);

//            label.setBackground(new Color(255, 0, 0, 90));

            label.setBackground(Color.gray);

        }

        return label;

    }

    @Override

    public void setBackground(Color bg) {

        if (bg instanceof ColorUIResource){

            bg = null;

        }

        super.setBackground(bg);

    }

}

FileTreeNode继承DefaultMutableTreeNode类， 用于保存文件名和其他文件相关属性

package FileTree;

import java.io.File;

import javax.swing.Icon;

import javax.swing.filechooser.FileSystemView;

import javax.swing.tree.DefaultMutableTreeNode;

/**

 * Created by Administrator on 2016/3/29.

 */

public class FileTreeNode extends DefaultMutableTreeNode {

	private static final long serialVersionUID = 1L;

	static FileSystemView fileSystemView = FileSystemView.getFileSystemView();

    private boolean isInit;

    private boolean isDummyRoot;

    private String fileName;

    private Icon fileIcon;

    public File getFile() {

        return file;

    }

    private File file;

    public FileTreeNode(File file){

        this(file, false, true);

    }

    public FileTreeNode(File file, boolean isDummyRoot){

        this(file,isDummyRoot, true);

    }

    public FileTreeNode(File file, boolean isDummyRoot, boolean allowsChildren){

        super(file, allowsChildren);

        this.file = file;

        this.fileName = fileSystemView.getSystemDisplayName(file);

        this.fileIcon = fileSystemView.getSystemIcon(file);

        this.isDummyRoot = isDummyRoot;

    }

    public boolean isInit() {

        return isInit;

    }

    public void setInit(boolean init) {

        isInit = init;

    }

    public boolean isDummyRoot() {

        return isDummyRoot;

    }

    public void setDummyRoot(boolean dummyRoot) {

        isDummyRoot = dummyRoot;

    }

    public String getFileName() {

        return fileName;

    }

    public void setFileName(String fileName) {

        this.fileName = fileName;

    }

    public Icon getFileIcon() {

        return fileIcon;

    }

    public void setFileIcon(Icon fileIcon) {

        this.fileIcon = fileIcon;

    }

}

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