如何在 Java 应用程序中打印 JTable 对象 [英] How to print a JTable object in the Java application

问题描述

问题 现在，一旦从数据库中获取数据并显示在嵌入在滚动窗格中的 JTable 对象表"中，我们如何创建打印作业以打印显示的表在 A3 大小的纸上?

我从数据库中获取数据的代码如下所示:

试试{Class.forName("com.mysql.jdbc.Driver");Connection con=DriverManager.getConnection("jdbc:mysql://localhost/newb","root","pass");语句 stat=con.createStatement();ResultSet res=stat.executeQuery("select * from table where name = '"+name+"'");结果集元数据 rsmd = res.getMetaData();int colcount = rsmd.getColumnCount();向量列 = 新向量(列数)；for(int i=3; i<=colcount; i++){column.add(rsmd.getColumnName(i));}矢量数据 = new Vector();向量行；//存储行数据而(res.next()){行 = 新向量(列数)；for(int i=3; i<=colcount; i++){row.add(res.getString(i));}数据添加(行)；}table = new JTable(data, columns);table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);scrollPane.setViewportView(table);}捕获(异常前){System.out.println(ex);}

我正在使用向量类从表中获取数据.我们如何将显示表格中显示的数据打印到纸上?

解决方案

您显然没有阅读 上一个问题.

来自如何使用表格

<块引用>

打印

JTable 提供了一个简单的 API 来打印表格.最简单的方法打印出一个表是调用 JTable.print 不带参数:

尝试{如果(！table.print()){System.err.println("用户取消打印");}} catch (java.awt.print.PrinterException e) {System.err.format("无法打印 %s%n", e.getMessage());}

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在普通 Swing 应用程序上调用打印会产生标准打印对话框.(在无头应用程序中，表格只是打印出来的.)返回值指示用户是否继续打印工作或取消它.JTable.print 可以抛出java.awt.print.PrinterException，这是一个检查异常；那是为什么上面的例子使用了 try ... catch.

JTable 提供了多种带有各种选项的打印重载.这TablePrintDemo.java 中的以下代码显示了如何定义页面标题:

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

尝试{table.print(JTable.PrintMode.FIT_WIDTH, header, null);} catch (java.awt.print.PrinterException e) {System.err.format("无法打印 %s%n", e.getMessage());}

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对于更复杂的打印应用，使用 JTable.getPrintable 来获取表格的 Printable 对象.有关可打印的更多信息，请参阅2D 图形路径中的打印课程.

Question Now once the data is fetched from the database and shown in the JTable object "table" embedded in the scrollPane, how do we create a print job that makes it possible to print the displayed table as such in A3 sized paper ?

My code to fetch the data from the database is shown below:

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);
}

I am using vector class to fetch the data from the table. How do we print the data shown in the displayed table to a paper?

解决方案

You obviously didn't read the links provided in your previous question.

From the Printing section of How to use Tables

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.

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