jtabel 遍历_Swing中经常会遇到的若干问题——JTable（持续更新） | 学步园

(1)让组件在屏幕中央显示

public static void setContainerCenter(Container container) {

Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

int screenWidth = screenSize.width;

int screenHight = screenSize.height;

container.setLocation((screenWidth - container.getWidth()) / 2, (screenHight - container.getHeight()) / 2);

}

(2)隐藏Jtable中的某一列

public static void hideColByLocation(int col, JTable table){

DefaultTableColumnModel dcm = (DefaultTableColumnModel) table.getColumnModel();

dcm.getColumn(col).setPreferredWidth(0);

dcm.getColumn(col).setMaxWidth(0);

dcm.getColumn(col).setMinWidth(0);

}

(3)Jtable中定位到当前新增加的行

public static void focusCurrentRow(JTable table, List objs) {

int last = objs.size() - 1;

table.setRowSelectionInterval(last, last);

table.changeSelection(last, 0, false, false);

}

(4)Jtable中行的上移、下移操作

public static void eventOnMoveUpOrDowmBySelectedRow(JTable table, String str, List nameList) {

int[] selectedRows = table.getSelectedRows();

for (int i = 0; i < selectedRows.length - 1; i++) {

if(selectedRows[i + 1] - selectedRows[i] != 1){

return;

}

}

List swapSelectedList = null;

if ("上移".equals(str)) {

if(selectedRows.length == 1){

swapSelectedList = swap(nameList, selectedRows[0], selectedRows[0] - 1);

setNameListAndModel(swapSelectedList, table);

table.getSelectionModel().setSelectionInterval(selectedRows[0] - 1, selectedRows[0] - 1);

}else{

swapSelectedList = swapUp(nameList, selectedRows);

setNameListAndModel(swapSelectedList, table);

table.getSelectionModel().setSelectionInterval(selectedRows[0]-1, selectedRows[selectedRows.length-1]-1);

}

} else if ("下移".equals(str)) {

if(selectedRows.length == 1){

swapSelectedList = swap(nameList, selectedRows[0], selectedRows[0] + 1);

setNameListAndModel(swapSelectedList, table);

table.getSelectionModel().setSelectionInterval(selectedRows[0] + 1, selectedRows[0] + 1);

}else{

swapSelectedList = swapDown(nameList, selectedRows);

setNameListAndModel(swapSelectedList, table);

table.getSelectionModel().setSelectionInterval(selectedRows[0]+1, selectedRows[selectedRows.length-1]+1);

}

}

}

/**

* {方法功能中文描述}上移多行

*/

private static List swapUp(List list, int[] selectedRows) {

if (selectedRows.length >= list.size() || selectedRows.length == 0 || selectedRows[0] == 0) {

return list;

} else {

String obj = list.get(selectedRows[0] - 1);

for (int pos : selectedRows) {

list.set(pos - 1, list.get(pos));

}

list.set(selectedRows[0] + selectedRows.length - 1 , obj);

return list;

}

}

/**

* {方法功能中文描述}下移多行

*/

private static List swapDown(List list, int[] selectedRows) {

if (selectedRows.length >= list.size() || selectedRows.length == 0 || selectedRows[selectedRows.length-1] == list.size()-1) {

return list;

} else {

String obj = list.get(selectedRows[selectedRows.length-1] + 1);

for (int i = selectedRows.length-1; i >= 0; i--) {

list.set(selectedRows[i] + 1, list.get(selectedRows[i]));

}

list.set(selectedRows[0] , obj);

return list;

}

}

/**

* {方法功能中文描述} 交换两行的位置

*/

private static List swap(List list, int fromRow, int toRow) {

if (toRow >= list.size() || toRow < 0) {

return list;

} else {

String obj = list.get(fromRow);

list.set(fromRow, list.get(toRow));

list.set(toRow, obj);

return list;

}

}

private static void setNameListAndModel(List NameList, JTable table) {

/**重新设置model中数据**/

table.getModel().setNames(NameList);

/**数据变化**/

table.getModel().fireTableDataChanged();

table.setModel(uiModel);

}

(5)打开面板选中Jtree第一个节点并展开

public static void setFirstNode2Selected(DefaultTreeModel model,JPanel panel, JTree currTree){

/**通过树根获取其第一个孩子**/

TreeNode firstChild = (TbTreeNode) ((DefaultMutableTreeNode)panel.getLeftContentPanel().getTreeModel().getRoot()).getFirstChild();

Object userObject = firstChild.getUserObject();

/**通过VO获取Node对象**/

TreeNode childnode = panel.getTreeModel().getNodeByVo(userObject);

if(childnode!=null){

childnode.setCanBeSelected(true); /**设置可被选中**/

childnode.setSelectState(TreeNode.SELECTED); /**设置被选中**/

}

/**设置选中的路径状态**/

currTree.getSelectionModel().setSelectionPath(new TreePath(childnode.getPath()));

}

(6)JTable行的多种选择模式

setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION); //一次选择一个或多个连续的索引范围。

setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION); //一次选择一个连续的索引范围。

setSelectionMode(ListSelectionModel.SINGLE_SELECTION); //一次选择一个列表索引。

(7)JTable不可编辑

调用AbstractTableModel中的setWriteable()方法，true为可以编辑，false为不可编辑

(8)JTable中数据发生变化时

调用AbstractTableModel中 fireTableDataChanged()方法进行处理

(9)JTable显示设置

//设置列名称

private static final String[] colNames = new String[] { "A", "B", "C", "D"};

//设置列名称显示

public String getColumnName(int column) {

return colNames[column];

}

//设置列数目

public int getColumnCount() {

return colNames.length;

}

//是否可编辑

public boolean isCellEditable(int rowIndex, int columnIndex) {

if(!isWriteable){

return false;

}

if(isWriteable){

//设置第二列可以编辑

if(columnIndex == 1){

return true;

}

}

return false;

}

//填充数据模型

public Object getValueAt(int rowIndex, int columnIndex) {

//假设从某一list中获取数据对象，遍历该list

if (list != null && list.size() > 0) {

for (int i = 0;i< list.size(); i++) {

switch (columnIndex) {

case 0:

return ""; //返回值自行设定

case 1:

return "";

case 2:

return "";

case 3:

return "";

case 4:

return "";

}

}

}

return null;

}

//修改表中数据时

public void setValueAt(Object aValue, int rowIndex, int columnIndex) {

if(columnIndex == 1){

//操作...

}

}