重拾JAVA之WinForm实战之(三)

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

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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

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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。

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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

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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

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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

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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!

本文转自 BruceAndLee 51CTO博客，原文链接：http://blog.51cto.com/leelei/1330835，如需转载请自行联系原作者