从JAVA直接读取EXCEL、WORD并生成PDF文件

从JAVA直接读取EXCEL、WORD并生成PDF文件

1。操作EXCEL和WORD文件
使用JAVA从EXCEL、WORD文件中读写数据，可以使用http://jexcelapi.sourceforge.net/提供的JAVA API－Java Excel API，这里有其指南http://www.andykhan.com/jexcelapi/tutorial.html，可由此下载JAR文件http://www.andykhan.com/jexcelapi/download.html。
此API提供所有的读、写、修改、建立的功能。对于一般应用足够了。在任何支持JAVA的系统上使用。目前，JExcelApi尚不支持有关chart、graph 或者 macro的信息，但是会拷贝并保留这些信息。只支持PNG图像。

2。生成PDF文件
若从JAVA生成PDF文件，可以使用http://www.qoppa.com/提供的应用程序库jPDFWriter。jPDFWriter是一个类库，可以直接从JAVA的应用程序调用以产生PDF文件。其网站的下载文件中包含了说明和例子，有兴趣可以仔细研究。


3。把JExcelAPI和jPDFWriter结合起来，就可以在应用中直接把XLS文件转换成PDF文件。如果再结合Database，就可以直接把有关的报告数据生成XLS文件的同时生成PDF文件。

下边给出了一个例子，是针对XLS，虽然简单，但是完整，以此为基础，可以按照自己的需要展开工作了。对于WORD也是一样，所有不再另给了。

//
//Compile:
//javac -classpath .;jexcelapi/jxl.jar;jPDFWriter/jPDFWriter.jar xlsPrinter.java
//Run:
//java -classpath .;jexcelapi/jxl.jar;jPDFWriter/jPDFWriter.jar xlsPrinter
//
//

import java.awt.Graphics;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;

import java.io.File;

import java.util.Vector;
import java.util.Date;

import jxl.*;//JExcelAPI

import com.qoppa.pdfPrinter.PDFPrinterJob;//jPDFWriter

public class xlsPrinter implements Printable
{
    private int m_CurrentPage;
    private int m_CurrentPageStartRow;
    private int m_CurrentPageEndRow;
    private final static int DEFAULT_COLUMN_WIDTH = 72;
    private final static int CELL_MARGIN_X = 4;
    private final static int CELL_MARGIN_Y = 4;
   
    private Vector m_Data;
    private int m_ColumnWidths [];
    private boolean m_DrawGrid;
   
    /**
     * @param printString
     */
    public xlsPrinter(Vector data, int [] colWidths, boolean drawGrid)
    {
        super();
        m_Data = data;
        m_ColumnWidths = colWidths;
        m_DrawGrid = drawGrid;
    }
   
    //读取EXCEL数据并存入内存
    private static Vector initData ()
    {
        Vector data = new Vector ();
   
                    try{   
         Workbook workbook = Workbook.getWorkbook(new File("output.xls"));
         Sheet sheet = workbook.getSheet(0);
         int rows = sheet.getRows();
         int cols = sheet.getColumns();

         // Initialize data
        for (int row = 0; row < rows; ++row){
            Vector rowData = new Vector ();
            for (int col = 0; col < cols; ++col){
                rowData.addElement (sheet.getCell(col,row).getContents());
            }
            data.addElement (rowData);
        }

    workbook.close(); 
                    }catch(Exception e){
                            e.printStackTrace();
                    }
        return data;
    }
   
    //主程序
    public static void main (String args [])
    {
        xlsPrinter gridPrinter = new xlsPrinter(initData (), null, true);
       
        PrinterJob printerJob = PDFPrinterJob.getPrinterJob();
        printerJob.setPrintable(gridPrinter);
       
        try{
            printerJob.print();
        }catch (PrinterException pe){
            pe.printStackTrace();
        }
       
        System.exit(0);
    }
   
    //打印接口，由此生成PDF文件，此段代码来源于jPDFWriter的例子
    public int print (Graphics g, PageFormat pf, int pageIndex)
    {
        int lineHeight = g.getFontMetrics().getHeight();
       
        // Reset current pos
        int currentRow = 0;
        if (pageIndex == 0)
        {
            // Need to do this in case the instance of this class
            // gets used multiple times to print a string
            m_CurrentPage = 0;
            m_CurrentPageStartRow = 0;
        }
        // Need to do this because Java PrinterJob can call this
        // method multiple times for the same page;
        else if (m_CurrentPage == pageIndex)
        {
            currentRow = m_CurrentPageStartRow;
        }
        else
        {
            currentRow = m_CurrentPageEndRow + 1;
            m_CurrentPageStartRow = currentRow;
        }
       
        // If we're out of lines, tell the PrinterJob we're done
        if (currentRow >= m_Data.size())
        {
            return Printable.NO_SUCH_PAGE;
        }

        // Loop through lines until we fill the page
        int currentY = (int)(pf.getImageableY() + lineHeight);
        while (currentRow < m_Data.size() &&
                currentY + lineHeight < pf.getImageableY() + pf.getImageableHeight())
        {
            // Draw the next line
            int currentX = (int)pf.getImageableX();
            Vector nextRow = (Vector)m_Data.elementAt (currentRow);
            for (int col = 0; col < nextRow.size(); ++col)
            {
                String cellString = (String)nextRow.elementAt (col);
                g.drawString (cellString, currentX + CELL_MARGIN_X, currentY + CELL_MARGIN_Y);
               
                int colWidth = DEFAULT_COLUMN_WIDTH;
                if (m_ColumnWidths != null && m_ColumnWidths.length > col)
                {
                    colWidth = m_ColumnWidths [col];
                }
               
                // Draw grid if needed
                if (m_DrawGrid)
                {
                    g.drawRect (currentX, currentY - (lineHeight / 2), colWidth, lineHeight);
                }
               
                // Advance x
                currentX += colWidth;
            }
           
            // Advance to the next line
            ++currentRow;
            currentY += lineHeight;
        }
       
        // Save the ned line and current page
        // Again, we have to do this because of multiple calls for the same page.
        m_CurrentPageEndRow = currentRow;
        m_CurrentPage = pageIndex;
       
        return Printable.PAGE_EXISTS;
    }
}