本文主要向大家介绍了Java开发之实现Java生成二维码功能 ，通过具体的内容向大家展现，希望对大家学习Java有所帮助。

效果图

步骤

maven依赖

<!--生成二维码-->  

<dependency>  

  <groupId>com.google.zxing</groupId>  

  <artifactId>javase</artifactId>  

  <version>3.3.0</version>  

</dependency>

工具类

package com.bennyrhys.mall.util;  

import com.google.zxing.BarcodeFormat;  

import com.google.zxing.WriterException;  

import com.google.zxing.client.j2se.MatrixToImageWriter;  

import com.google.zxing.common.BitMatrix;  

import com.google.zxing.qrcode.QRCodeWriter;  

import java.io.IOException;  

import java.nio.file.FileSystems;  

import java.nio.file.Path;  

/**  

 * 描述：     生成二维码工具  

 */  

public class QRCodeGenerator {  

    public static void generateQRCodeImage(String text, int width, int height, String filePath)  

            throws WriterException, IOException {

         QRCodeWriter qrCodeWriter = new QRCodeWriter();  

        BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height);  

        Path path = FileSystems.getDefault().getPath(filePath);  

        MatrixToImageWriter.writeToPath(bitMatrix, "PNG", path);  

    }  

    public static void main(String[] args) {  

        try {  

            generateQRCodeImage("Hello World", 350, 350, "E:/JAVA/mall/src/main/resources/images/QRTest.png");  

        } catch (WriterException e) {  

            e.printStackTrace();  

        } catch (IOException e) {  

            e.printStackTrace();  

        }  

    }  

}

service

/**  

  * 生成二维码  

  * 图片可解析出访问的支付对应订单号的支付连接  

  * @param orderNo 订单号  

  * @return 返回图片地址  

  */  

 @Override  

 public String qrcode(String orderNo) {  

     ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();  

     HttpServletRequest request = attributes.getRequest();  

     String address = ip + ":" + request.getLocalPort();  

     String payUrl = "//" + address + "/pay?orderNo=" + orderNo;  

     try {  

         QRCodeGenerator.generateQRCodeImage(payUrl, 350, 350, Constant.FILE_UPLOAD_PATH + orderNo + ".png");  

     } catch (WriterException e) {  

         e.printStackTrace();  

     } catch (IOException e) {  

         e.printStackTrace();  

     }  

     String pngAddress = "//" + address + "/images-dev/" + orderNo + ".png";  

     return pngAddress;  

 }

扩展

局域网调试

线上调试

切换ip

# 指定IP(防止ip转发获取的是内网ip)   

file.upload.ip=127.0.0.1  

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