Java打印

Java打印

import java.awt.Color;

import java.awt.Font;

import java.awt.FontMetrics;

import java.awt.Graphics;

import java.awt.print.PageFormat;

import java.awt.print.Printable;

import java.awt.print.PrinterException;

import java.awt.print.PrinterJob;

public class Print implements Printable {

    int m_wPage;

    int m_hPage;

    int m_orientation;

    Printable m_target;

    int maxNumPage = 1;

    String title = "数据表格打印";

    Font titleFont = new Font("黑体", Font.BOLD, 14);

    boolean hasTail = true;

    int tailAlign = 0;

    int headAlign = 0;

    int topSpace = 0;

    int leftSpace = 0;

    int yStart = 0;

    int yEnd = 0;

    int xStart = topSpace;

    int xEnd = 0;

    int x = 0, y = 0;

    String strTemp = "打印内容";

    public void doPrint() {

        try {

            m_orientation = PageFormat.PORTRAIT; // 竖向打印

            m_orientation = PageFormat.LANDSCAPE; // 横向打印

            // 设置打印对象，默认纸张

            PrinterJob prnJob = PrinterJob.getPrinterJob();

            PageFormat pageFormat = prnJob.defaultPage();

            pageFormat.setOrientation(m_orientation);

            m_wPage = (int) (pageFormat.getWidth()); // 竖向595

            m_hPage = (int) (pageFormat.getHeight()); // 竖向841

            // 将待打印的窗体根据默认纸张设置传入打印对象

            prnJob.setPrintable(this, pageFormat);

            if (!prnJob.printDialog())

                return;

            prnJob.print();

        } catch (PrinterException ex) {

            ex.printStackTrace();

            System.err.println("打印错误：" + ex.toString());

        }

    }

    /**

     * 初始化打印参数

     */

    public void initPrintParameter() {}

    /**

     * 构造打印内容，以送打印机打印

     */

    public int print(Graphics pg, PageFormat pageFormat, int pageIndex) throws PrinterException {

        if(pageIndex>0){ // 保证只打印一页；

            return NO_SUCH_PAGE;

        }

        // 初始化打印参数

        initPrintParameter();

        // 将画布设置为页面大小

        pg.translate((int) pageFormat.getImageableX(), (int) pageFormat.getImageableY());

        int wPage = 0;

        int hPage = 0;

        // 根据打印机页面设置调整画布大小

        if (pageFormat.getOrientation() == pageFormat.PORTRAIT) {

            wPage = (int) pageFormat.getImageableWidth(); // 竖向451

            hPage = (int) pageFormat.getImageableHeight(); // 竖向697

        } else {

            wPage = (int) pageFormat.getImageableWidth();

            //wPage += wPage / 2; // 为什么加增加一半？

            hPage = (int) pageFormat.getImageableHeight();

            pg.setClip(0, 0, wPage, hPage);

        }

        wPage = wPage - 2 * leftSpace;

        hPage = hPage - 2 * topSpace;

        xStart = leftSpace;

        xEnd = wPage - 2;

        // 为画布设置颜色和字体

        int y = topSpace;

        pg.setFont(titleFont);

        pg.setColor(Color.black);

        // 画标题，并使其居中

        Font fn = pg.getFont();

        FontMetrics fm = pg.getFontMetrics();

        y += fm.getAscent();

        alignText(title, pg, y, xStart, xEnd, headAlign);

        y += 30;

        x = leftSpace + 2;

        Font headerFont = new Font("宋体", Font.BOLD, 14);

        pg.setFont(headerFont);

        fm = pg.getFontMetrics();

        int h = fm.getAscent();

        yStart = y - 1;

        y += h;

        pg.setFont(headerFont);

        fm = pg.getFontMetrics();

        int header = y;

        h = fm.getHeight();

        // 计算行高，每页行数，总行数和指定页码的起始行、结束行

        int rowH = Math.max(h, 10);

        int tailH = rowH + 30;

        int rowPerPage = 0;

        int leftPix = 0;

        if (hasTail) {

            rowPerPage = (hPage - header - tailH) / rowH;

            leftPix = (hPage - header - tailH) % rowH;

            yEnd = hPage - leftPix - tailH + 2;

        } else {

            rowPerPage = (hPage - header) / rowH;

            leftPix = (hPage - header) % rowH;

            yEnd = hPage - leftPix + 2;

        }

        pg.drawString(strTemp, x, y);

        // 画表格边框

        pg.drawLine(xStart, yStart, xStart, yEnd);

        pg.drawLine(xStart, yStart, xEnd, yStart);

        pg.drawLine(xEnd, yStart, xEnd, yEnd);

        pg.drawLine(xStart, yEnd, xEnd, yEnd);

        // 打印页码

        if (hasTail) {

            int pageNumber = pageIndex + 1;

            String s = "第" + pageNumber + "页";

            alignText(s, pg, yEnd + 30, xStart, xEnd, tailAlign);

        }

        System.gc();

        return PAGE_EXISTS;

    }

    /**

     * 文字排列，坐标在y处,显示范围（start-end） 0表示居中显示，1表示左对齐，2表示右对齐

     */

    private void alignText(String s, Graphics pg, int y, int start, int end, int mode) {

        Font fn = pg.getFont();

        FontMetrics fm = pg.getFontMetrics();

        int wString = fm.stringWidth(s);

        int x = start;

        switch (mode) {

        case 0:

            if ((end - start - wString) > 0)

                x = start + (end - start - wString) / 2;

            break;

        case 1:

            break;

        case 2:

            if ((end - start - wString) > 0)

                x = start + (end - start - wString);

            break;

        }

        pg.drawString(s, x, y);

    }

    public static void main(String[] args) {

        Print p = new Print();

        p.doPrint();

    }

}