java生产条形码

准备：jbarcode-0.2.8.jar,下载地址：jbarcode-0.2.8.zip

jsp:

<img src="<%=basePath%>barcode/showBarCode" alt="" style="width: 200px; height: 150px;">

controller

import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.InputStream;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import util.OneBarcodeUtil;

@Controller
@RequestMapping("/barcode")
public class BarcodeController {
    @RequestMapping("/")
    public String index(){
        return "barcode";
    }
    @RequestMapping("/showBarCode")
    public void showIMG(HttpServletRequest req,HttpServletResponse resp) throws Exception{
        OneBarcodeUtil obu = new OneBarcodeUtil();
        byte[] bs = obu.createBarcodeDefault("123123123");//这里是条码号
         InputStream in = new ByteArrayInputStream(bs);// 业务逻辑取得图片的byte[]
         BufferedOutputStream bout = new BufferedOutputStream(resp.getOutputStream()); 
         //从输入流到输出流  
        try {    
          //  byte b[] = new byte[1024];    
            int len = in.read(bs);    
            while (len > 0) {    
                bout.write(bs, 0, len);    
                len = in.read(bs);    
            }    
        } catch (Exception e) {    
            throw e;     
        } finally {    
            bout.close();    
            in.close();    
        }  
    }
}

工具类

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.lang.reflect.Constructor;

import org.jbarcode.JBarcode;
import org.jbarcode.encode.BarcodeEncoder;
import org.jbarcode.encode.Code39Encoder;
import org.jbarcode.paint.BaseLineTextPainter;
import org.jbarcode.paint.EAN13TextPainter;
import org.jbarcode.paint.WideRatioCodedPainter;
import org.jbarcode.paint.WidthCodedPainter;
import org.jbarcode.util.ImageUtil;

public class OneBarcodeUtil { 

    
       
    /** 
     * 生成一维码 
     * @param value 值 
     * @return 
     */  
    public static byte[] createBarcodeDefault(String value){  
        return createBarcode(Code39Encoder.class,value,false);  
    }  
    
    
  //产生一维码图片  
    public static byte[] createBarcode(Class<?> clazz,String value,boolean checkDigit){  
          try{  
              JBarcode localJBarcode = new JBarcode(getInstance(clazz),WidthCodedPainter.getInstance(),EAN13TextPainter.getInstance());    
              localJBarcode.setPainter(WideRatioCodedPainter.getInstance());    
              localJBarcode.setTextPainter(BaseLineTextPainter.getInstance());    
              localJBarcode.setCheckDigit(checkDigit);  
              localJBarcode.setShowCheckDigit(checkDigit);  
              return getBytes(localJBarcode.createBarcode(value));    
          }catch (Exception e) {  
            e.printStackTrace();  
            return null;  
        }  
    }  
    
    
    //获取单例的对象  
    private static BarcodeEncoder getInstance(Class<?> clazz) throws Exception{  
        Constructor<?>[] constructors=clazz.getDeclaredConstructors();  
        Constructor<?> privateConstructor = constructors[0];  
        privateConstructor.setAccessible(true);  
        return (BarcodeEncoder)privateConstructor.newInstance();  
          
    }  
      
    //获取图片字节码数组  
    private static byte[] getBytes(BufferedImage paramBufferedImage) throws IOException{    
          return ImageUtil.encode(paramBufferedImage,"jpeg", 96, 96);  
    }    
    
    
}

 启动项目访问：http://localhost:8080/wxPublic/barcode/

生产条形码：