java使用zxing插件绘制二维码

ZXing是一个开放源码的，用Java实现的多种格式的1D/2D条码图像处理库，它包含了联系到其他语言的端口。Zxing可以实现使用手机的内置的摄像头完成条形码的扫描及解码。

涉及到的依赖有：

<!-- https://mvnrepository.com/artifact/com.google.zxing/core -->
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>core</artifactId>
            <version>3.3.0</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.google.zxing/javase -->
        <dependency>
            <groupId>com.google.zxing</groupId>
            <artifactId>javase</artifactId>
            <version>3.3.0</version>
        </dependency>

具体代码：

package com.example.demo.controller;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;

/**
 * 　@Description:
 * 　@author miaoying
 * 　@date 2018/6/4
 */
@Controller
public class DrawController {

    @RequestMapping("/getQrCodePic")
    public String getQrCodePic(@RequestParam("content") String content, HttpServletResponse response) throws WriterException, IOException {
        OutputStream outputStream = response.getOutputStream();
        int width = 200;
        int height = 200;
        String format = "png";
        Map<EncodeHintType, Object> hints = new HashMap<>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);
        MatrixToImageWriter.writeToStream(bitMatrix, format, outputStream);
        return "qrcode";
    }

}

访问链接：http://localhost:8080/getQrCodePic?content=miaoying

最终结果：