当我们打印的合同的时候都会看到条形码，这条形码在网页上怎么生成呢?下面给出一个例子，需要的朋友可以拿去用,这个例子是通过servlet生成的。
(1)index.jsp
<%@ page language="java" import="java.util.*" isELIgnored="false" pageEncoding="gbk" %> <% String path = request.getContextPath(); %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <mce:script type="text/javascript"><!-- //重新刷新整个页面 function refresh(){ window.location.reload(); } // --></mce:script> </head> <body> <!-- 生成条形码下面的数字，并将其放入request对象的缓存中--> <% int a[]=new int[10]; String s=""; for(int i=0;i<a.length;i++){ a[i]=new Random().nextInt(10); s+=String.valueOf(a[i]); } request.setAttribute("code",s); %> <img id="barcode"src="${pageContext.request.contextPath }/CreateBarCode?barType=CODE39&checkCharacter=n&checkCharacterInText=n&code=${code}"/> <input type="button" value="刷新" onclick="refresh()"/> </body> </html>
(2)BarCodeServlet.java
package barcode; import com.sun.image.codec.jpeg.*; import java.awt.*; import java.awt.image.BufferedImage; import java.io.IOException; import java.util.StringTokenizer; import javax.servlet.*; import javax.servlet.http.*; public class BarCodeServlet extends HttpServlet { private static final long serialVersionUID = 7531179353355072472L; public BarCode barcode; public BarCodeServlet() { } public void init() throws ServletException { } private BarCode getChart(HttpServletRequest httpservletrequest) { if (barcode == null) barcode = new BarCode(); try { setParameter("barType", httpservletrequest.getParameter("barType")); if (httpservletrequest.getParameter("width") != null && httpservletrequest.getParameter("height") != null) { setParameter("width", httpservletrequest.getParameter("width")); setParameter("height", httpservletrequest.getParameter("height")); setParameter("autoSize", "n"); } setParameter("code", httpservletrequest.getParameter("code")); setParameter("st", httpservletrequest.getParameter("st")); setParameter("textFont", httpservletrequest.getParameter("textFont")); setParameter("fontColor", httpservletrequest.getParameter("fontColor")); setParameter("barColor", httpservletrequest.getParameter("barColor")); setParameter("backColor", httpservletrequest.getParameter("backColor")); setParameter("rotate", httpservletrequest.getParameter("rotate")); setParameter("barHeightCM", httpservletrequest.getParameter("barHeightCM")); setParameter("x", httpservletrequest.getParameter("x")); setParameter("n", httpservletrequest.getParameter("n")); setParameter("leftMarginCM", httpservletrequest.getParameter("leftMarginCM")); setParameter("topMarginCM", httpservletrequest.getParameter("topMarginCM")); setParameter("checkCharacter", httpservletrequest.getParameter("checkCharacter")); setParameter("checkCharacterInText", httpservletrequest.getParameter("checkCharacterInText")); setParameter("Code128Set", httpservletrequest.getParameter("Code128Set")); setParameter("UPCESytem", httpservletrequest.getParameter("UPCESytem")); } catch (Exception exception) { exception.printStackTrace(); barcode.code = "Parameter Error"; } return barcode; } public void setParameter(String s, String s1) { if (s1 != null) if (s.equals("code")) barcode.code = s1; else if (s.equals("width")) barcode.width = (new Integer(s1)).intValue(); else if (s.equals("height")) barcode.height = (new Integer(s1)).intValue(); else if (s.equals("autoSize")) barcode.autoSize = s1.equalsIgnoreCase("y"); else if (s.equals("st")) barcode.showText = s1.equalsIgnoreCase("y"); else if (s.equals("textFont")) barcode.textFont = convertFont(s1); else if (s.equals("fontColor")) barcode.fontColor = convertColor(s1); else if (s.equals("barColor")) barcode.barColor = convertColor(s1); else if (s.equals("backColor")) barcode.backColor = convertColor(s1); else if (s.equals("rotate")) barcode.rotate = (new Integer(s1)).intValue(); else if (s.equals("barHeightCM")) barcode.barHeightCM = (new Double(s1)).doubleValue(); else if (s.equals("x")) barcode.X = (new Double(s1)).doubleValue(); else if (s.equals("n")) barcode.N = (new Double(s1)).doubleValue(); else if (s.equals("leftMarginCM")) barcode.leftMarginCM = (new Double(s1)).doubleValue(); else if (s.equals("topMarginCM")) barcode.topMarginCM = (new Double(s1)).doubleValue(); else if (s.equals("checkCharacter")) barcode.checkCharacter = s1.equalsIgnoreCase("y"); else if (s.equals("checkCharacterInText")) barcode.checkCharacterInText = s1.equalsIgnoreCase("y"); else if (s.equals("Code128Set")) barcode.code128Set = s1.charAt(0); else if (s.equals("UPCESytem")) barcode.UPCESytem = s1.charAt(0); else if (s.equals("barType")) if (s1.equalsIgnoreCase("CODE39")) barcode.barType = 0; else if (s1.equalsIgnoreCase("CODE39EXT")) barcode.barType = 1; else if (s1.equalsIgnoreCase("INTERLEAVED25")) barcode.barType = 2; else if (s1.equalsIgnoreCase("CODE11")) barcode.barType = 3; else if (s1.equalsIgnoreCase("CODABAR")) barcode.barType = 4; else if (s1.equalsIgnoreCase("MSI")) barcode.barType = 5; else if (s1.equalsIgnoreCase("UPCA")) barcode.barType = 6; else if (s1.equalsIgnoreCase("IND25")) barcode.barType = 7; else if (s1.equalsIgnoreCase("MAT25")) barcode.barType = 8; else if (s1.equalsIgnoreCase("CODE93")) barcode.barType = 9; else if (s1.equalsIgnoreCase("EAN13")) barcode.barType = 10; else if (s1.equalsIgnoreCase("EAN8")) barcode.barType = 11; else if (s1.equalsIgnoreCase("UPCE")) barcode.barType = 12; else if (s1.equalsIgnoreCase("CODE128")) barcode.barType = 13; else if (s1.equalsIgnoreCase("CODE93EXT")) barcode.barType = 14; else if (s1.equalsIgnoreCase("POSTNET")) barcode.barType = 15; else if (s1.equalsIgnoreCase("PLANET")) barcode.barType = 16; else if (s1.equalsIgnoreCase("UCC128")) barcode.barType = 17; } public void doGet(HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse) throws ServletException, IOException { httpservletresponse.setContentType("image/jpeg"); javax.servlet.ServletOutputStream servletoutputstream = httpservletresponse.getOutputStream(); httpservletresponse.setHeader("Pragma", "no-cache"); httpservletresponse.setHeader("Cache-Control", "no-cache"); httpservletresponse.setDateHeader("Expires", 0L); try { BarCode barcode1 = getChart(httpservletrequest); barcode1.setSize(barcode1.width, barcode1.height); if (barcode1.autoSize) { BufferedImage bufferedimage = new BufferedImage(barcode1.getSize().width, barcode1.getSize().height, 13); java.awt.Graphics2D graphics2d = bufferedimage.createGraphics(); barcode1.paint(graphics2d); barcode1.invalidate(); graphics2d.dispose(); } BufferedImage bufferedimage1 = new BufferedImage(barcode1.getSize().width, barcode1.getSize().height, 1); java.awt.Graphics2D graphics2d1 = bufferedimage1.createGraphics(); barcode1.paint(graphics2d1); JPEGImageEncoder jpegimageencoder = JPEGCodec.createJPEGEncoder(servletoutputstream); JPEGEncodeParam jpegencodeparam = jpegimageencoder.getDefaultJPEGEncodeParam(bufferedimage1); jpegencodeparam.setQuality(1.0F, true); jpegimageencoder.setJPEGEncodeParam(jpegencodeparam); jpegimageencoder.encode(bufferedimage1, jpegencodeparam); } catch (Exception exception) { exception.printStackTrace(); } } public void doPost(HttpServletRequest httpservletrequest, HttpServletResponse httpservletresponse) throws ServletException { try { doGet(httpservletrequest, httpservletresponse); } catch (Exception exception) { exception.printStackTrace(); } } private Font convertFont(String s) { StringTokenizer stringtokenizer = new StringTokenizer(s, "|"); String s1 = stringtokenizer.nextToken(); String s2 = stringtokenizer.nextToken(); String s3 = stringtokenizer.nextToken(); byte byte0 = -1; if (s2.trim().toUpperCase().equals("PLAIN")) byte0 = 0; else if (s2.trim().toUpperCase().equals("BOLD")) byte0 = 1; else if (s2.trim().toUpperCase().equals("ITALIC")) byte0 = 2; return new Font(s1, byte0, (new Integer(s3)).intValue()); } private Color convertColor(String s) { Color color = null; if (s.trim().toUpperCase().equals("RED")) color = Color.red; else if (s.trim().toUpperCase().equals("BLACK")) color = Color.black; else if (s.trim().toUpperCase().equals("BLUE")) color = Color.blue; else if (s.trim().toUpperCase().equals("CYAN")) color = Color.cyan; else if (s.trim().toUpperCase().equals("DARKGRAY")) color = Color.darkGray; else if (s.trim().toUpperCase().equals("GRAY")) color = Color.gray; else if (s.trim().toUpperCase().equals("GREEN")) color = Color.green; else if (s.trim().toUpperCase().equals("LIGHTGRAY")) color = Color.lightGray; else if (s.trim().toUpperCase().equals("MAGENTA")) color = Color.magenta; else if (s.trim().toUpperCase().equals("ORANGE")) color = Color.orange; else if (s.trim().toUpperCase().equals("PINK")) color = Color.pink; else if (s.trim().toUpperCase().equals("WHITE")) color = Color.white; else if (s.trim().toUpperCase().equals("YELLOW")) color = Color.yellow; return color; } }
(3)web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <servlet> <servlet-name>CreateBarCode</servlet-name> <servlet-class>barcode.BarCodeServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>CreateBarCode</servlet-name> <url-pattern>/CreateBarCode</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
(4)运行效果
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