java多线程下载工具（一）

1、  主界面的搭建

效果图：

分析：界面的工具栏是一个JToolBar，导航栏是一个JTree、资源列表为JTable、资源信息列表为JList。注意：这些都不是简单的拖控件式是现代的而是写代码的哦。

 下面是部分主要代码：

public void createMainFrame() {// TODO Auto-generated method stubDimension screen = Toolkit.getDefaultToolkit().getScreenSize();// 导航滚动JScrollPane navPane = new JScrollPane(navTree);JScrollPane downloadPane = new JScrollPane(downloadTable);int downloadPaneHeight = (int) (screen.height / 1.5);int downloadPaneWidth = (int) (screen.width / 0.8);downloadPane.setPreferredSize(new Dimension(downloadPaneWidth,downloadPaneHeight));JScrollPane infoPane = new JScrollPane(infoJList);// 主界面右边的分隔PaneJSplitPane rightPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT,downloadPane, infoPane);rightPane.setDividerLocation(500);rightPane.setDividerSize(3);// 主界面的分隔PaneJSplitPane mainPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,navPane, rightPane);mainPane.setDividerSize(3);mainPane.setDividerLocation((int) (screen.width / 5.5));this.add(mainPane);this.setPreferredSize(new Dimension(screen.width, screen.height - 30));this.setVisible(true);this.setTitle("多线程下载工具");}
public static void main(String[] args) {  // TODO Auto-generated method stub
  MainFrame mFrame = new MainFrame();  mFrame.createTree();//调用创建导航树的方法。  mFrame.createTable();  mFrame.createList();  mFrame.createBar();  mFrame.createMainFrame();
 }
/**  * 创建左边的导航树列表：正在下载、下载失败、下载完成  *   * @author Administrator  */ public void createTree() {  // TODO Auto-generated method stub
  // 实例化各个节点（任务节点、正在下载节点、下载失败节点、下载完成节点）  DownloadRootNode taskNode = new DownloadRootNode();  DownloadingNode downloadingNode = new DownloadingNode();  DownloadFailNode failNode = new DownloadFailNode();  DownloadFinishNode finishNode = new DownloadFinishNode();
  // 根节点  DefaultMutableTreeNode root = new DefaultMutableTreeNode();  DefaultMutableTreeNode tn = new DefaultMutableTreeNode(taskNode);  root.add(tn);
  // 创建各个节点并且将各个节点添加到任务节点的子节点中
  tn.add(new DefaultMutableTreeNode(downloadingNode));  tn.add(new DefaultMutableTreeNode(failNode));  tn.add(new DefaultMutableTreeNode(finishNode));  this.navTree = new NavigationTree(root);  // navTree.setCellRenderer(new NovigationTreeCellRender()); }
 

NavigationTree类：设置导航树的相关信息（根节点的隐藏、渲染器等）界面上的文字及图片等都是通过渲染器来渲染上去的。

 

public class NavigationTree extends JTree { public  NavigationTree(DefaultMutableTreeNode root) {  // TODO Auto-generated constructor stub  super(root);  this.setRootVisible(false);  this.setShowsRootHandles(true);  this.setCellRenderer(new NavigationTreeCellRender());//为每一个节点设置渲染器  //展开第一层节点  for (int i = 0; i < root.getChildCount(); i++) {   DefaultMutableTreeNode node = (DefaultMutableTreeNode)root.getChildAt(i);   this.expandPath(new TreePath(node.getPath()));  } }}

渲染器的实现：

public class NavigationTreeCellRender extends DefaultTreeCellRenderer implements TreeCellRenderer {public Component getTreeCellRendererComponent(JTree tree, Object value,boolean sel, boolean expanded, boolean leaf, int row,boolean hasFocus) {// TODO Auto-generated method stub super.getTreeCellRendererComponent(tree, value, sel,expanded,leaf, row, hasFocus);// 得到树节点DefaultMutableTreeNode node = (DefaultMutableTreeNode) value;// 得到节点对象DownloadNode obj = (DownloadNode) node.getUserObject();// 设置文本和图片if (obj != null) {this.setIcon(obj.getImageIcon());this.setText(obj.getText());}return this;}}

到这里，左边导航树基本已经实现，其他的实现思路基本一致，

 

这里可能说的不是很清楚，后续会继续更新，最后昨完了本人会把完整的源代码上传。