Java打印小票

绝地灬酷狼 2022-04-03 11:09 321阅读 0赞

**“无边落木萧萧下，不尽长江滚滚来”**

## 前言 ##

最近在帮别人做个打印的功能，就是登记完学生信息后，用小票打印出学生信息。打印预览图如下：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0FfUnVubmVy_size_16_color_FFFFFF_t_70]

## 实现 ##

首先我用Java代码实现：

import com.xxx.students.domain.StudentInfo;
    import com.sun.image.codec.jpeg.JPEGCodec;
    import com.sun.image.codec.jpeg.JPEGEncodeParam;
    import com.sun.image.codec.jpeg.JPEGImageEncoder;
    
    import javax.imageio.ImageIO;
    import javax.servlet.http.HttpServletRequest;
    import java.awt.*;
    import java.awt.image.BufferedImage;
    import java.awt.print.*;
    import java.io.*;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    
    public class PrintUtils implements Printable {
    
        private StudentInfo studentInfo;
        private HttpServletRequest request;
    
        public PrintUtils(HttpServletRequest request,StudentInfo studentInfo) {
            this.studentInfo = studentInfo;
            this.request = request;
        }
    
        public PrintUtils() {
        }
    
        @Override
        public int print(Graphics g, PageFormat pf, int page) throws PrinterException {
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            if (page > 0) {
                return NO_SUCH_PAGE;
            }
            Graphics2D g2d = (Graphics2D) g;
            g2d.setFont(new Font("Default", Font.PLAIN, 20));
            g2d.drawString("测试打印", 60, 20);
            g2d.drawString("-------------------------------------", 7, 30);
            g2d.setFont(new Font("Default", Font.PLAIN, 12));
            g2d.drawString("学生姓名：" + studentInfo.getName(), 5, 45);
            g2d.drawString("手机号码：" + studentInfo.getParentPhone(), 5, 75);
            g2d.drawString("课程名称：" + studentInfo.getCourseName(), 5, 105);
            g2d.drawString("缴费金额：" + studentInfo.getPaymentAmount() + " RMB", 5, 135);
            g2d.drawString("支付方式：" + studentInfo.getPaymentModeName(), 5, 165);
            g2d.drawString("打印时间：" + sdf.format(new Date()), 5, 195);
            g2d.drawImage(writeQrCodeContent(),50, 225,100,100, null);
            return PAGE_EXISTS;
        }
    
    
        /**
         *@author ruanhui
         *@date 2018/12/10
         *@description 生成二维码
         */
        public Image writeQrCodeContent()  {
            java.awt.Image im = null ;
            try {
                //获取图片路径
                String filePath = request.getSession().getServletContext().getRealPath("/") + "resource/images/";
                System.out.println("filePath:" + filePath) ;
                File file=new File(filePath + "xxx.jpg");
                System.out.println(file.getName());
                InputStream is = new FileInputStream(file);
                BufferedImage bi;
                bi = ImageIO.read(is);
                 im = (java.awt.Image)bi;
            }catch (Exception e) {
                e.printStackTrace();
            }
            return im;
        }
    
        //打印方法
        public static void print(HttpServletRequest request,StudentInfo studentInfo) {
    
            int height = 250 + 3 * 15 + 20;
    
            // 通俗理解就是书、文档
            Book book = new Book();
    
            // 打印格式
            PageFormat pf = new PageFormat();
            pf.setOrientation(PageFormat.PORTRAIT);
    
            // 通过Paper设置页面的空白边距和可打印区域。必须与实际打印纸张大小相符。
            Paper p = new Paper();
            p.setSize(230, height);
            p.setImageableArea(5, -20, 230, height + 20);
            pf.setPaper(p);
    
            // 把 PageFormat 和 Printable 添加到书中，组成一个页面
            book.append(new PrintUtils(request,studentInfo), pf);
    
            // 获取打印服务对象
            PrinterJob job = PrinterJob.getPrinterJob();
            job.setPageable(book);
            try {
                job.print();
            } catch (PrinterException e) {
                System.out.println("================打印出现异常");
            }
        }
    }

这段java代码能实现在本地运行中调用打印机并且打印。但是把项目放到服务器上就不能调本地的打印机了。  
于是，有了第二种打印方法，用JS实现：

//测试打印
    function doTestPrint() {
        var nowDate = new Date();
        //初始化打印机
        var LODOP=getLodop();
        LODOP.PRINT_INIT("测试打印");               //首先一个初始化语句
        LODOP.SET_PRINT_STYLE("FontSize", 25); //字体大小
        LODOP.ADD_PRINT_TEXT(20,50,150,20,"xxxx");//然后多个ADD语句及SET语句
        LODOP.SET_PRINT_STYLE("FontSize", 10); //字体大小
        LODOP.ADD_PRINT_TEXT(50,5,250,20,"--------------------------------");//然后多个ADD语句及SET语句
        LODOP.ADD_PRINT_TEXT(70,5,180,20,"学生姓名：诺贝尔爱情奖");//然后多个ADD语句及SET语句
        LODOP.ADD_PRINT_TEXT(95,5,180,20,"手机号码：123456");//然后多个ADD语句及SET语句
        LODOP.ADD_PRINT_TEXT(120,5,180,20,"课程名称：年卡");//然后多个ADD语句及SET语句
        LODOP.ADD_PRINT_TEXT(145,5,180,20,"缴费金额：1000RMB");//然后多个ADD语句及SET语句
        LODOP.ADD_PRINT_TEXT(170,5,180,20,"支付方式：支付宝支付");//然后多个ADD语句及SET语句
        LODOP.ADD_PRINT_TEXT(195,5,220,20,"打印时间：" + nowDate.getFullYear() + "-" + (nowDate.getMonth() + 1) + "-" + nowDate.getDate() + " " + nowDate.getHours() + ":" + nowDate.getMinutes() + ":" + nowDate.getSeconds());//然后多个ADD语句及SET语句
        // ADD_PRINT_TEXT(intTop,intLeft,intWidth,intHeight,strContent)增加纯文本项
        LODOP.ADD_PRINT_IMAGE(220,50,150,150,"<img border='0' src='../../resource/images/xxx.jpg' width='150' height='150'/>"); //打印二维码
        LODOP.SET_PRINT_STYLEA(0,"Stretch",2);//按原图比例(不变形)缩放模式
        LODOP.PREVIEW();    //打印预览
        // LODOP.PRINT();                               //最后一个打印(或预览、维护、设计)语句
    }

在JS文件写上面的代码即可调用打印机。这里用到的插件就是[Lodop][]。需要从官网下载类似驱动（我是这样的认为的）软件安装之后，然后需要引入它的JS文件，`<script src="js/LodopFuncs.js?v=<%=new Date()%>"></script>` 就这么简单，在哪都可以打印了。具体请见官网参考实例：[官网样例][Link 1]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0FfUnVubmVy_size_16_color_FFFFFF_t_70]: /images/20220403/d90279776a5b4a558772d887615e0398.png
[Lodop]: http://www.lodop.net/
[Link 1]: http://www.lodop.net/LodopDemo.html