java - 如何在 Java 应用程序中打印 JTable 对象

Question

问题 现在，一旦数据从数据库中获取并显示在 scrollPane 中嵌入的 JTable 对象“表”中，我们如何创建打印作业以打印显示的表在 A3 大小的纸张中如此？

我从数据库中获取数据的代码如下所示:

try 
{
    Class.forName("com.mysql.jdbc.Driver"); 
    Connection con=DriverManager.getConnection("jdbc:mysql://localhost/newb","root","pass");
    Statement stat=con.createStatement();   
    ResultSet res=stat.executeQuery("select * from table where name = '"+name+"'");
    ResultSetMetaData rsmd = res.getMetaData();
    int colcount = rsmd.getColumnCount();
    Vector columns = new Vector(colcount);
        for(int i=3; i<=colcount; i++)
    {
        columns.add(rsmd.getColumnName(i));
    }
    Vector data = new Vector();
    Vector row;

    // Store row data
    while(res.next())
    {
        row = new Vector(colcount);
        for(int i=3; i<=colcount; i++)
        {
            row.add(res.getString(i));
        }
        data.add(row);
    }
    table = new JTable(data, columns);
    table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    scrollPane.setViewportView(table);
}
catch(Exception ex)
{       
    System.out.println(ex);
}

我正在使用 vector 类从表中获取数据。我们如何将显示的表格中显示的数据打印到纸上？

Answer 1

您显然没有阅读 previous question 中提供的链接.

来自 How to use Tables 的打印部分

Printing

JTable provides a simple API for printing tables. The easiest way to print out a table is to invoke JTable.print with no arguments:

try {
     if (! table.print()) {
         System.err.println("User cancelled printing");
     } 
 } catch (java.awt.print.PrinterException e) {
     System.err.format("Cannot print %s%n", e.getMessage()); 
 } 

Invoking print on a normal Swing application brings up a standard printing dialog box. (On a headless application, the table is simply printed.) The return value indicates whether the user went ahead with the print job or cancelled it. JTable.print can throw java.awt.print.PrinterException, which is a checked exception; that's why the above example uses a try ... catch.

JTable provides several overloads of print with various options. The following code from TablePrintDemo.java shows how to define a page header:

MessageFormat header = new MessageFormat("Page {0,number,integer}");

try {
    table.print(JTable.PrintMode.FIT_WIDTH, header, null); 
} catch (java.awt.print.PrinterException e) {
     System.err.format("Cannot print %s%n", e.getMessage()); 
}

For more sophisticated printing applications, use JTable.getPrintable to obtain a Printable object for the table. For more on Printable, refer to the Printing lesson in the 2D Graphics trail.