本文介绍了使用Java创建一个包含树形结构和表格组件的界面的过程，并实现了数据加载及删除功能。
今天主要是将如下界面做成JAVA版的，我做这个Winform的目的并不是说觉得winform有前途，而是在练手，为了后面web和Andriod开发打点基础。
那做好的java界面如下
OK，画好了，看代码，首先是绑定树的一个代码
public void BuildCodeTree() throws SQLException {
treeCode.removeAll();
DefaultMutableTreeNode top = new DefaultMutableTreeNode(new NodeData(
"root", "系统参数"));
String sql = "SELECT Distinct ename,cname FROM dbo.Codes WITH(NOLOCK)";
ResultSet res = JDBCSqlHelper.query(sql);
try {
while (res.next()) {
DefaultMutableTreeNode childTreeNode = new DefaultMutableTreeNode(
new NodeData(res.getString("ename"),
res.getString("cname")));
top.add(childTreeNode);
}
this.treeCode = new JTree(top);
treeCode.setBounds(10, 39, 146, 278);
treeCode.addTreeSelectionListener(new TreeSelectionListener() {
public void valueChanged(TreeSelectionEvent e) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) treeCode
.getLastSelectedPathComponent();
String nodeName = ((NodeData) node.getUserObject()).ename;
if (nodeName == "root")
return;
String sql = "SELECT 0 as bit,data,ename,cname,display_content FROM dbo.Codes WHERE ename='"
+ nodeName + "'";
ResultSet res = JDBCSqlHelper.query(sql);
List<String> columnList = new ArrayList<String>();
columnList.add("选择");
columnList.add("数据值");
columnList.add("英文代码");
columnList.add("中文代码");
columnList.add("显示值");
DataFillHelper.FillTable(res, table, columnList);
table.getColumnModel().getColumn(0)
.setCellRenderer(new TableCellRenderer() {
public Component getTableCellRendererComponent(
JTable table, Object value,
boolean isSelected, boolean hasFocus,
int row, int column) {
JCheckBox ck = new JCheckBox();
ck.setSelected(isSelected);
ck.requestFocus(hasFocus);
ck.setHorizontalAlignment((int) 0.5f);
return ck;
}
});
table.getColumnModel().getColumn(0).setWidth(10);
}
});
treeCode.setBorder(new LineBorder(new Color(0, 0, 0)));
contentPane.add(treeCode);
// treeCode.setCellRenderer(new MyRenderer());
treeCode.setShowsRootHandles(true);
treeCode.setRootVisible(true);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
res.close();
}
}这段代码首先会从数据库读出要加载的树的数据，由于这里的树只有两级，所以代码很简单。先定义一个root节点，然后将数库中的读出的节点加载在他下面。这样树就形成了，然后在树节点被选择时注册一个事件，事件中，如果选择的是root节点，则不加载右边的Jtable数据。否则根据英文代码加载左边的Jtable数据。
节点的数据使用NodeData这个类类记录的
private class NodeData {
private String ename;
public String getEname() {
return ename;
}
public void setEname(String ename) {
this.ename = ename;
}
private String cname;
public String getCname() {
return cname;
}
public void setCname(String cname) {
this.cname = cname;
}
public NodeData() {
}
public NodeData(String ename, String cname) {
this.setEname(ename);
this.setCname(cname);
}
public String toString() {
return cname;
}
}左边的JTable数据的加载通过DataFillHelper类实现。
public class DataFillHelper {
public static void FillTable(ResultSet res, JTable jTable,List<String> columnList) {
Vector<String> columnHeads = new Vector<String>();
Vector<Vector> rows = new Vector<Vector>();
try {
ResultSetMetaData rsmd = res.getMetaData();
for (int i = 1; i <= rsmd.getColumnCount(); i++) {
columnHeads.addElement(rsmd.getColumnName(i));
}
while (res.next()) {
Vector<String> v = new Vector<String>();
for (int i = 1; i <= rsmd.getColumnCount(); i++) {
v.addElement(res.getString(i));
}
rows.add(v);
}
DefaultTableModel model = new DefaultTableModel(rows, columnHeads);
jTable.setModel(model);
makeFace(jTable);
for (int i = 0; i < jTable.getColumnModel().getColumnCount(); i++) {
jTable.getColumnModel().getColumn(i).setHeaderValue(
columnList.get(i));
}
} catch (SQLException e) {
// TODO 自动生成 catch 块
e.printStackTrace();
}
}
public static void makeFace(JTable table) {
try {
DefaultTableCellRenderer tcr = new DefaultTableCellRenderer() {
public Component getTableCellRendererComponent(JTable table,
Object value, boolean isSelected, boolean hasFocus,
int row, int column) {
if (row % 2 == 0)
setBackground(new Color(206, 231, 255));
else if (row % 2 == 1)
setBackground(Color.white);
return super.getTableCellRendererComponent(table, value,
isSelected, hasFocus, row, column);
}
};
for (int i = 0; i < table.getColumnCount(); i++) {
table.getColumn(table.getColumnName(i)).setCellRenderer(tcr);
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
}这里就不多做解释，解释我也解释不清楚。OK，在这里需要说明的是如果将jtable放在JScrollPane中，可能会导致jtable的列头不能显示，所以需要加入下面的代码
table = new JTable();
table.setBorder(UIManager.getBorder("FormattedTextField.border"));
table.setBackground(Color.WHITE);
JScrollPane scrollPane = new JScrollPane(table);
scrollPane.setBounds(166, 39, 430, 278);
contentPane.add(scrollPane);
table.setFillsViewportHeight(true);就是那句SetFillsViewportHeight。OK,接下来我们看一下界面上的删除按钮功能。在前面我们已经在JTable中加入了checkBox。接下里我们看删除按钮的代码
private void DeleteCodes() {
int[] rowIndexs = table.getSelectedRows();
if(rowIndexs.length==0){
MessageHelper.ShowMessage("请选择要删除的数据!");
return;
}
StringBuffer strBuffer = new StringBuffer();
for (int i : rowIndexs) {
Object data = table.getValueAt(i, 1);
Object ename = table.getValueAt(i, 2);
strBuffer.append("'");
strBuffer.append(data.toString() + ename.toString());
strBuffer.append("',");
}
strBuffer.setLength(strBuffer.length() - 1);
String sql = "DELETE FROM dbo.Codes WHERE (data+ename) IN ("
+ strBuffer.toString() + ")";
MessageHelper.ShowMessage(sql);
JDBCSqlHelper.update(sql);
}还有一个要说的是，我们并不想让后后面的列被编辑，我们只想第一列被编辑，所以需要覆盖IsCellEditable方法
table = new JTable() {
public boolean isCellEditable(int row, int column) {
if (column == 0) {
return true;
} else
return false;
}
};OK，今天就讲到这里,洗洗睡!
转载于:https://blog.51cto.com/leelei/1330835
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