使用rowindex從JTable中檢索行數據

Question

如何使用rowindex從JTable中檢索行數據？

Answer 1

在Swing中，每個UI組件都有一個相應的模型來管理數據。大多數情況下，您可以通過在組件上調用getModel()來獲取模型。對於JTable，該模型是TableModel類。您可以使用方法getRowCount(),getValueAt(x,y)和getColumnCount()來訪問表格的數據。

Answer 2

 


import javax.swing.JTable; 
import javax.swing.table.AbstractTableModel; 
import javax.swing.table.DefaultTableModel; 
import javax.swing.table.TableModel; 
import java.awt.event.ActionListener; 
import java.awt.event.MouseAdapter; 
import java.awt.event.MouseEvent; 
import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
import java.util.StringTokenizer; 
import javax.swing.JMenuItem; 
import javax.swing.JPopupMenu; 
import javax.swing.JSeparator; 

/** 
* Basic JTable with some convenience methods. 
* @author dvargo 
*/ 
public class ConvenienceTable extends JTable 
{ 

    /** 
    * The pop up menu for the table 
    */ 
    private JPopupMenu Pmenu = new JPopupMenu(); 

    /** 
    * Holds the currently being/last row clicked in the table. 
    */ 
    private int rowClicked = -1; 

    /** 
    * Holds the currently being/last column clicked in the table. 
    */ 
    private int colClicked = -1; 

    /** 
    * If the table is editable or not 
    */ 
    private boolean isEditable = true; 

    /** 
    * Default construct that uses the default table model 
    */ 
    public ConvenienceTable() 
    { 
     super(); 
     addPopUpMenu(); 
    } 

    /** 
    * Constructor that lets you set the table model to use 
    * @param model The table model you would like to use 
    */ 
    public ConvenienceTable(AbstractTableModel model) 
    { 
     super(model); 
     addPopUpMenu(); 
    } 

    /** 
    * Returns the contents of of a cell as a string 
    * @param row The row of the cell 
    * @param col The col of the cell 
    * @return The string representation of a cell 
    */ 
    public String getValueforCell(int row, int col) 
    { 
     return (String) getModel().getValueAt(row, col).toString(); 
    } 

    /** 
    * Inserts a single row with all cells empty into the table 
    */ 
    public void insertRow() 
    { 
     //get the model the table is using 
     TableModel temp = getModel(); 
     //cast it so we can do something useful with it 
     DefaultTableModel tm = (DefaultTableModel) temp; 
     tm.addRow(new Object[]{}); 
     resizeAndRepaint(); 
    } 

    /** 
    * Inserts multiple rows with each cell empty into the table 
    * @param numberOfRowsToAdd The number of rows to add to the table 
    */ 
    public void insertRow(int numberOfRowsToAdd) 
    { 
     //get the model the table is using 
     TableModel temp = getModel(); 
     //cast it so we can do something useful with it 
     DefaultTableModel tm = (DefaultTableModel) temp; 
     for (int i = 0; i < numberOfRowsToAdd; i++) 
     { 
      tm.addRow(new Object[]{}); 
     } 
    } 
     /** 
    * Insets a row with the given data as the rows contents 
    * @param data The data to input into the row 
    */ 
    public void insertRow(String[] data) 
    { 
     insertRow(); 
     int row = getRowCount() - 1; 
     int colCounter = 0; 
     for(String currData : data) 
     { 
      setValueAt(currData,row,colCounter); 
      colCounter++; 
      if(colCounter &lgt = getColumnCount()) 
      { 
       break; 
      } 
     } 
    } 


    /** 
    * Inserts a column at the end of the columns. 
    * @param colName The name for this column 
    */ 
    public void insertColumn(String colName) 
    { 
     //get the model the table is using 
     TableModel temp = getModel(); 
     //cast it so we can do something useful with it 
     DefaultTableModel tm = (DefaultTableModel) temp; 
     tm.addColumn(colName, new Object[] 
       { 
       }); 
     getTableHeader().resizeAndRepaint(); 
     resizeAndRepaint(); 
    } 

    /** 
    * Inserts a multiple columns into the table 
    * @param numberOfColumns The number of columns to add to the table 
    */ 
    public void insertColumn(int numberOfColumns) 
    { 
     //get the model the table is using 
     TableModel temp = getModel(); 
     //cast it so we can do something useful with it 
     DefaultTableModel tm = (DefaultTableModel) temp; 
     for (int i = 0; i < numberOfColumns; i++) 
     { 
      tm.addColumn(new Integer(i).toString(), new Object[] 
        { 
        }); 
      getTableHeader().resizeAndRepaint(); 
     } 
    } 

    /** 
    * Deletes a row from the table at a given index 
    * @param rowIndex The row index to delete. Row index 0 is below the column 
    * headers 
    */ 
    public void deleteRow(int rowIndex) 
    { 
     if (rowIndex < 0) 
     { 
      return; 
     } 
     //get the model the table is using 
     TableModel temp = getModel(); 
     //cast it so we can do something useful with it 
     DefaultTableModel tm = (DefaultTableModel) temp; 
     tm.removeRow(rowIndex); 
     getTableHeader().resizeAndRepaint(); 
    } 

    /** 
    * Delete a column from the table 
    * @param colIndex The index of the column to delete 
    */ 
    public void deleteColumn(int colIndex) 
    { 
     if (colIndex < 1) 
     { 
      return; 
     } 
     removeColumn(getColumnModel().getColumn(colIndex)); 
     getTableHeader().resizeAndRepaint(); 
    } 

    /** 
    * Changes the name of a column 
    * @param colIndex The index of the column to change name 
    * @param newName The name of the column 
    */ 
    public void setColumnName(int colIndex, String newName) 
    { 
     getColumnModel().getColumn(colIndex).setHeaderValue(newName); 
     getTableHeader().resizeAndRepaint(); 
    } 

    /** 
    * Sets the columns of the table 
    */ 
    public void setColumnNames(String[] names) 
    { 
     setNumberOfCols(names.length); 
     for (int i = 0; i < names.length; i++) 
     { 
      setColumnName(i, names[i]); 
     } 
    } 

    /** 
    * Sets the number of row in the table to a certain value. The rows are added 
    * to the end of the table 
    * @param numberOfRows The number of rows that should be in the table 
    * 
    */ 
    public void setNumberOfRows(int numberOfRows) 
    { 
     if (numberOfRows == getRowCount() || numberOfRows < 0) //user requested the same number of rows 
     { 
      return; 
     } 
     else if (numberOfRows &lgt getRowCount()) //user requested more rows 
     { 
      int numberOfRowsToAdd = Math.abs(getRowCount() - numberOfRows); 
      insertRow(numberOfRowsToAdd); 
     } 
     else if (numberOfRows < getRowCount()) //user request les rows 
     { 
      int numberOfRowsToDelete = Math.abs(getRowCount() - numberOfRows); 
      for (int i = 0; i < numberOfRowsToDelete; i++) 
      { 
       deleteRow(getRowCount() - 1); 
      } 
     } 
     resizeAndRepaint(); 
    } 

    /** 
    * Sets the number of cols for the table. The columns are added and deleted 
    * at the end of the table 
    * @param numberOfCols 
    */ 
    public void setNumberOfCols(int numberOfCols) 
    { 
     //user requested the same number of rows 
     if (numberOfCols == getColumnCount() || numberOfCols < 0) 
     { 
      return; 
     } 
     else if (numberOfCols &lgt getColumnCount()) //user requested more rows 
     { 
      int numberOfColsToAdd = Math.abs(getColumnCount() - numberOfCols); 
      insertColumn(numberOfColsToAdd); 
     } 
     else if (numberOfCols getColumnCount()) //user request les rows 
     { 
      int numberOfColsToDelete = Math.abs(getColumnCount() - numberOfCols); 
      for (int i = 0; i < numberOfColsToDelete; i++) 
      { 
       deleteColumn(getColumnCount() - 1); 
      } 
     } 
     resizeAndRepaint(); 
    } 

    /** 
    * Returns the string name value of the column 
    * @param colIndex The index of the column whose name you want 
    * @return The name of the column 
    */ 
    public String getColumnName(int colIndex) 
    { 
     return (String) getColumnModel().getColumn(colIndex).getHeaderValue(); 
    } 

    /** 
    * Returns an array holding all the column names 
    * @return The column names 
    */ 
    public String[] getColumnNames() 
    { 
     String[] colNames = new String[getColumnCount()]; 
     for (int i = 0; i < getColumnCount(); i++) 
     { 
      colNames[i] = getColumnName(i); 
     } 
     return colNames; 
    } 

    /** 
    * Gets the index in the table for a column with the given name 
    * @param colName The name of the column 
    * @return The index of the column in the table or -1 if it is not found 
    */ 
    public int getColumnIndex(String colName) 
    { 
     String [] names = getColumnNames(); 
     int retVal = -1; 
     for(int i = 0; i < names.length; i++) 
     { 
      if(names[i].equals(colName)) 
      { 
       retVal = i; 
      } 
     } 
     return retVal; 
    } 

    /** 
    * Allows the user to paste multiple lines and columns into the table 
    * @param row The row where the paste is to start from 
    * @param col The column where the paste is to start from 
    */ 
    public void paste(int row, int col) 
    { 
     //used to determine what info goes in which coloumn of the table 
     String newLineDelim = "\n"; 
     //used to determine what info goes in what cell in a row 
     String nextElementDelim = "\t"; 

     String pasteString = ClipboardUtility.getClipboardContents(); //get this info on the clipboard 


     //see if we can handle parsing this string 
     if (pasteString.contains(newLineDelim) == false || pasteString.contains(nextElementDelim) == false) 
     { 
      //paste it all into the first cell if we done recognize it 
      setValueAt(pasteString, row, col); 
     } 

     //parse the columns first 
     String[] pasteSplitString = pasteString.split(newLineDelim); 

     String[] temp = null; 
     String[][] finalInfo = new String[pasteSplitString.length][getColumnCount()]; 

     //now parse the columns into the individual cells 
     for (int i = 0; i < pasteSplitString.length; i++) 
     { 
      temp = pasteSplitString[i].split(nextElementDelim); 
      finalInfo[i] = temp; 
     } 

     //put this info in the table 
     for (int i = 0; i < finalInfo.length; i++) 
     { 
      for (int j = 0; j < finalInfo[i].length; j++) 
      { 
       //its in a try catch incase the indexes do not match up, allows us to do a partial paste 
       try 
       { 
        //see if you need to add a row to the table 
        if (i + row &lgt getRowCount() - 1) 
        { 
         insertRow(); 
        } 
        getModel().setValueAt(finalInfo[i][j], i + row, j + col); 
       } 
       catch (Exception e) 
       { 
        System.err.println("Could not paste"); 
       } 
      } 
     } 
    } 

    /** 
    * Copies the text in the selected cells in the table to the clipboard 
    */ 
    public void copy() 
    { 
     //were going to use the \t for next column and \n for next row format 
     String newCol = "\t"; 
     String newRow = "\n"; 

     //index to start coping from 
     int rowStart = getSelectedRow(); 
     int colStart = getSelectedColumn(); 

     //index to stop copying from 
     int colEnd = colStart + getSelectedColumnCount(); 
     int rowEnd = rowStart + getSelectedRowCount(); 

     //will hold the string of data were copying 
     StringBuilder copyString = new StringBuilder(); 

     //copy it cell by cell 
     for (int row = rowStart; row < rowEnd; row++) 
     { 
      if (row != rowStart) 
      { 
       copyString.append(newRow); 
      } 
      for (int col = colStart; col < colEnd; col++) 
      { 
       String currCellVal = (String) (getValueAt(row, col)); 
       //so you dont get "null" copied to the clipboard 
       if (currCellVal == null) 
       { 
        currCellVal = ""; 
       } 
       copyString.append(currCellVal); 
       if (col + 1 < colEnd) 
       { 
        copyString.append(newCol); 
       } 
      } 
     } 

     //post the string to the clipboard 
     ClipboardUtility.setClipboardContents(copyString.toString()); 

    } 

    /** 
    * Returns the table as a array of strings with the data separated by a delimiter. 
    * Each string in the array represents a row in the table. 
    * @param delim The delimiter to separate the columns by 
    * @return The data in the table 
    */ 
    public String[] getTableData(String delim) 
    { 
     String[] data = new String[getRowCount()]; 

     int colCount = getColumnCount(); 
     int rowCount = getRowCount(); 

     //get the row data 
     StringBuffer currRow = new StringBuffer(); 
     for (int row = 0; row < rowCount; row++) 
     { 
      for (int col = 0; col < colCount; col++) 
      { 
       currRow.append(getValueAt(row, col)); 
       currRow.append(delim); 
      } 
      data[row] = currRow.toString(); 
      currRow = new StringBuffer(); 
     } 
     return data; 
    } 

    /** 
    * Returns the data in the table as a 2d string array [row][col] 
    * @return The data in the table 
    */ 
    public String[][] getTableData() 
    { 
     String[][] data = new String[this.getRowCount()][this.getColumnCount()]; 
     for (int r = 0; r < getRowCount(); r++) 
     { 
      for (int c = 0; c < getColumnCount(); c++) 
      { 
       data[r][c] = getValueforCell(r, c); 
      } 
     } 
     return data; 
    } 

    /** 
    * Return a row from the table as a array of strings 
    * @param rowIndex The index of the row you would like 
    * @return Returns the row from the table as an array of strings or null if 
    * the index is invalid 
    */ 
    public String[] getRowData(int rowIndex) 
    { 
     //test the index 
     if (rowIndex &lgt getRowCount() || rowIndex < 0) 
     { 
      return null; 
     } 
     ArrayList < String &lgt data = new ArrayList < String &lgt(); 
     for (int c = 0; c < getColumnCount(); c++) 
     { 
      data.add((String) getValueforCell(rowIndex, c)); 
     } 
     String[] retVal = new String[data.size()]; 
     for (int i = 0; i < retVal.length; i++) 
     { 
      retVal[i] = data.get(i); 
     } 
     return retVal; 
    } 

    /** 
    * Returns the data for a row as a hash map with the column being the key 
    * and the cell being the value 
    * @param rowIndex The row to get the data for 
    * @return A map represneting the row 
    */ 
    public Map < String,String &lgt getRowDataAsMap(int rowIndex) 
    { 
     Map < String,String &lgt retVal = new HashMap < String, String &lgt(); 
     String [] rowData = getRowData(rowIndex); 
     String [] colData = getColumnNames(); 
     for(int i = 0; i < colData.length; i++) 
     { 
      retVal.put(colData[i],rowData[i]); 
     } 
     return retVal; 
    } 

    /** 
    * Sets the data in the table 
    * @param data String array of delimited data for the table 
    * @param delim The delimeter 
    */ 
    public void setData(String[] data, String delim) 
    { 
     setNumberOfCols(parseTableData(data[0], delim).length); 
     setNumberOfRows(data.length); 
     String[] currRow; 
     for (int r = 0; r < data.length; r++) 
     { 
      currRow = parseTableData(data[r], delim); 
      for (int c = 0; c < currRow.length; c++) 
      { 
       setValueAt(currRow[c], r, c); 
      } 
     } 
    } 

    /** 
    * Sets the values in the table 
    * @param data 
    */ 
    public void setData(String[][] data) 
    { 
     setNumberOfRows(data.length); 
     setNumberOfCols(data[0].length); 
     for (int r = 0; r < data.length; r++) 
     { 
      for (int c = 0; c < data[r].length; c++) 
      { 
       setValueAt(data[r][c], r, c); 
      } 
     } 
    } 

    /** 
    * Sets the data for a table starting at a given location in the table 
    * @param data The delimited data to add to the table 
    * @param delim The delimiter for the data 
    * @param row The row where to start adding the data 
    * @param col The col where to start adding the table 
    */ 
    public void setData(String[] data, String delim, int row, int col) 
    { 
     setNumberOfCols(col + parseTableData(data[0], delim).length); 
     setNumberOfRows(row + data.length); 
     String[] currRow; 
     for (int r = row; r < data.length; r++) 
     { 
      currRow = parseTableData(data[r], delim); 
      for (int c = col; c < currRow.length; c++) 
      { 
       setValueAt(currRow[c], r, c); 
      } 
     } 
    } 

    /** 
    * Removes all the rows in the table 
    */ 
    public void clearTable() 
    { 
     DefaultTableModel dm = (DefaultTableModel) getModel(); 
     dm.getDataVector().removeAllElements(); 
    } 

    /** 
    * Adds a menu item to the pop up menu with an action listener. 
    * @param newItem The menu item to add 
    * @param actionListener The actionlistener to add to this menu item 
    */ 
    public void addPopUpMenuItem(JMenuItem newItem, ActionListener actionListener) 
    { 
     newItem.addActionListener(actionListener); 
     Pmenu.add(newItem); 
    } 

    /** 
    * Adds a menu item to the pop up menu. Not this can be as simple Jseparator 
    * or a menu item with a actionlistener already attached. 
    * @param newItem The menu item to add 
    */ 
    public void addPopUpMenuItem(JMenuItem newItem) 
    { 
     Pmenu.add(newItem); 
    } 

    /** 
    * Adds a separator to the JMenu 
    */ 
    public void addPopUpMenuSeperator() 
    { 
     Pmenu.add(new JSeparator()); 
    } 

    /** 
    * Gets the current row being clicked 
    * @return The current row being clicked 
    */ 
    public int getRowClicked() 
    { 
     return rowClicked; 
    } 

    /** 
    * Gets the current column being clicked 
    * @return The current column being clicked 
    */ 
    public int getColClicked() 
    { 
     return colClicked; 
    } 

    /** 
    * Adds the pop up menu and additional functionality to the table. The key 
    * thing here is that this function adds the action listeners that determine 
    * what row and what column is being clicked in the table. 
    */ 
    private void addPopUpMenu() 
    { 
     //sets the popup menu so it will show 
     addMouseListener(new MouseAdapter() 
     { 

      public void mouseReleased(MouseEvent e) 
      { 
       rowClicked = rowAtPoint(e.getPoint()); 
       colClicked = columnAtPoint(e.getPoint()); 
       if (e.isPopupTrigger()) 
       { 
        Pmenu.show(e.getComponent(), e.getX(), e.getY()); 
       } 
      } 

      public void mouseClicked(MouseEvent e) 
      { 
       rowClicked = rowAtPoint(e.getPoint()); 
       colClicked = columnAtPoint(e.getPoint()); 
      } 
     }); 
    } 

    /** 
    * Parses out the table data from a string (usually xml) using the passed in 
    * delimiter. This is pretty much just like the sting classes split method 
    * @param data The data to parse 
    * @param delim The delimiter to use 
    * @return An array of the tokens parsed out of the data string 
    */ 
    public String[] parseTableData(String data, String delim) 
    { 
     ArrayList < String &lgt tempArrayHolder = new ArrayList < String &lgt(); 
     StringTokenizer st = new StringTokenizer(data, delim); 
     while (st.hasMoreTokens()) 
     { 
      tempArrayHolder.add(st.nextToken()); 
     } 
     String[] retValArray = new String[tempArrayHolder.size()]; 
     for (int i = 0; i < tempArrayHolder.size(); i++) 
     { 
      retValArray[i] = tempArrayHolder.get(i); 
     } 
     return retValArray; 
    } 

    /** 
    * Determines if the table is editable or not. Note that this is for the whole 
    * table and not individual cells. 
    * @param isEditable True if the table is editable, false if the table is not 
    * editable 
    */ 
    public void setEditable(boolean isEditable) 
    { 
     this.isEditable = isEditable; 
    } 


    /** 
    * Overridden to allow the hole table to be set to non editable or editable. 
    * Depends on the value of isEditable 
    * @param row The for the cell to see if it is editable 
    * @param col The col for the cell to see if it is editable 
    * @return True if the cell is editable false otherwise 
    */ 
    @Override 
    public boolean isCellEditable(int row, int col) 
    { 
     if (isEditable == false) 
     { 
      return false; 
     } 
     return super.isCellEditable(row, col); 
    } 

    /** 
    * Returns the indexes of the selected rows in the table 
    * Overridden due to the inconsistent behavior of the default 
    * @return A list of the selected rows 
    */ 
    @Override 
    public int[] getSelectedRows() 
    { 
     List < Integer &lgt temp = new ArrayList < Integer &lgt(); 
     for(int i = 0; i < getRowCount(); i++) 
     { 
      if(isRowSelected(i)) 
      { 
       temp.add(i); 
      } 
     } 
     int [] retVal = new int[temp.size()]; 
     for(int i =0; i < temp.size(); i++) 
     { 
      retVal[i] = temp.get(i); 
     } 
     return retVal; 
    } 

} 

 

Answer 3

我認爲這可以在比@ user489041的答案少幾行。 ;-)

試試這個示例代碼：

int selectedRowIndex = jTable.getSelectedRow(); 
int selectedColumnIndex = jTable.getSelectedColumn(); 
Object selectedObject = (Object) jTable.getModel().getValueAt(selectedRowIndex, selectedColumnIndex); 

替換，不管你存儲在表中的「對象」，如「字符串」。

如果您已設置您的JTable，以便用戶只能選擇整行，則將「selectedColumnIndex」替換爲要從中檢索內容的列索引。