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发信人: zms@smth.org (来福), 信区: Java
标  题: 我写的条形码控件(Powered by zms)
发信站: BBS 水木清华站 (Sat Mar 22 21:10:22 2003)
转信站: HIT!news.neu.edu.cn!maily.cic.tsinghua.edu.cn!SMTH

我写的一个显示条形码的控件
参照我找到的一个条形码的说明写的
下面是源代码，可以运行，显示的是一本书的upc
我对比了一下，有一个小地方不一样
书后的条形码很明显违反我看的这个条形码的说明
不过大部分是和我显示的一样的
如果有什么意见和建议:可以mailto:zms@263.net
package com.zms.upc;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Toolkit;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.UIManager;
/**
* Powered by zms
* 请不要用于商业用途
* 请保留上面的标志
*/
public class UPC extends JLabel {
public void paint(Graphics g) {
  super.paint(g);
  FontMetrics metrics=g.getFontMetrics();
  int ha=metrics.getAscent()-metrics.getDescent();
  int hb=ha/2;
  int hc=line.height;
  int hd=line.width;
  int he=metrics.getAscent()-metrics.getDescent();
  int totalheight=ha+hb+hc+hd+he;
  int wa=metrics.stringWidth(""+left+" ");
  int wb=line.width*95;
  int wc=line.width;
  int wd=metrics.stringWidth(""+right);
  int totalwidth=wa+wb+wc+wd;
  Dimension dim=new Dimension(totalwidth,totalheight);
  this.setMinimumSize(dim);
  int x=(this.getWidth()-totalwidth)/2;
  int y=(this.getHeight()-totalheight)/2;
  int wid=metrics.stringWidth(isbn);
  g.drawString(isbn,x+wa+(wb-wid)/2,y+ha);
  drawUpc(g,x+wa,y+ha+hb,hd+he/2);
  g.drawString(""+left,x,y+totalheight);
  wid=metrics.stringWidth(upc.substring(0,1));
  int one=line.width;
  x=x+wa+one*3;
  y=y+totalheight;
  int the=one*7;
  for(int i=0;i<6;i++) {
   g.drawString(upc.substring(i,i+1),x+(the-wid)/2,y);
   x+=the;
  }
  x+=one*5;
  for(int i=6;i<12;i++) {
   g.drawString(upc.substring(i,i+1),x+(the-wid)/2,y);
   x+=the;
  }
  x+=one*3+wc;
  g.drawString(""+right,x,y);
}
private static String[] CODEA=new String[]{"0001101","0011001","0010011","0
111101","0100011","0110001","0101111","0111011","0110111","0001011"};
private static String[] CODEB=new String[]{"1110010","1100110","1101100","1
000010","1011100","1001110","1010000","1000100","1001000","1110100"};
private void drawUpc(Graphics g,int x,int y,int t) {
  int x1=x;
  int one=line.width;
  int height=line.height;
  String s="101";
  String s1="101";
  for(int i=0;i<6;i++) {
   s+=CODEA[upc.charAt(i)-'0'];
   s1+="0000000";
  }
  s+="01010";
  s1+="01010";
  for(int i=6;i<12;i++) {
   s+=CODEB[upc.charAt(i)-'0'];
   s1+="0000000";
  }
  s+="101";
  s1+="101";
  int n=s.length();
  for(int i=0;i<n;i++) {
   if(s.charAt(i)=='1') {
    g.fillRect(x,y,one,height);
   }
   x+=one;
  }
  x=x1;
  n=s1.length();
  for(int i=0;i<n;i++) {
   if(s1.charAt(i)=='1') {
    g.fillRect(x,y+height,one,t);
   }
   x+=one;
  }
}
private String upc="123456987654";
public void setUpc(String s) {
  if(s!=null && s.length()==12) {
   boolean valid=true;
   for(int i=0;i<12;i++) {
    if(!Character.isDigit(s.charAt(i))) {
     valid=false;
     break;
    }
   }
   if(valid) {
    this.upc=s;
    this.repaint();
   }
  }
}
public String getUpc() {
  return this.upc;
}
private String isbn="ISBN 1-2034-5678-9";
public void setIsbn(String s) {
  if(s!=null && s.length()==10) {
   boolean valid=true;
   for(int i=0;i<10;i++) {
    if(!Character.isDigit(s.charAt(i))) {
     valid=false;
     break;
    }
   }
   if(valid) {
    this.isbn="ISBN "+s.substring(0,1)+"-"+s.substring(1,5)+"-"+s.substring(
5,9)+"-"+s.substring(9);
    this.repaint();
   }
  }
}
public void setIsbn(String s,int a,int b,int c,int d) {
  if(s!=null && s.length()==10 && a>0 && b>0 && c>0 && d>0 && (a+b+c+d)==10)
{
   boolean valid=true;
   for(int i=0;i<10;i++) {
    if(!Character.isDigit(s.charAt(i))) {
     valid=false;
     break;
    }
   }
   if(valid) {
    this.isbn="ISBN "+s.substring(0,a)+"-"+s.substring(a,a+b)+"-"+s.substrin
g(a+b,a+b+c)+"-"+s.substring(a+b+c);
    this.repaint();
   }
  }
}
public String getIsbn() {
  return this.isbn;
}
private Dimension line=new Dimension(2,100);
public void setLineDimension(Dimension dim) {
  if(dim.width>0 && dim.height>0) {
   this.line=new Dimension(dim.width,dim.height);
   this.repaint();
  }
}
public Dimension getLineDimension() {
  return new Dimension(line.width,line.height);
}
private char left='9';
public void setLeft(char one) {
  this.left=one;
  this.repaint();
}
public char getLeft() {
  return left;
}
private char right='>';
public void setRight(char one) {
  this.right=one;
  this.repaint();
}
public char getRight() {
  return right;
}
//for test use
public static void main(String[] args) {
  try {
   UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
  } catch (Exception e) {
  }
  JFrame frame=new JFrame("UPC Test");
  frame.setSize(500,500);
  frame.getContentPane().setLayout(new BorderLayout());
  //<usage>
  UPC upc=new UPC();
  upc.setFont(new Font("Dialog",Font.PLAIN,20)); //字体
  upc.setUpc("787505379930");   //upc
  upc.setIsbn("7505379933",1,4,4,1); //isbn
  upc.setLineDimension(new Dimension(2,120)); //最小黑线的size
  upc.setLeft('9');   //左边字符
  upc.setRight('>');   //右边字符
  frame.getContentPane().add(upc,BorderLayout.CENTER);
  //</usage>
  frame.addWindowListener(new WindowAdapter() {
   public void windowClosing(WindowEvent e) {
    System.exit(0);
   }
  });
  Dimension screen=Toolkit.getDefaultToolkit().getScreenSize();
  Dimension one=frame.getSize();
  frame.setLocation((screen.width-one.width)/2,(screen.height-one.height)/2)
;
  frame.setVisible(true);
}
}

--
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我决定不用花里胡梢的签名档

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