SpringBoot中生成条形码的方案实战

在Spring Boot中生成条形码可以使用第三方库如Barcode4J或Google Chart API。以下是使用Google Chart API生成条形码的示例：

1. 添加依赖（如果使用Maven）：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

2. 创建一个控制器来生成并响应条形码图像：

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.view.Controller;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLEncoder;
 
@RestController
public class BarcodeController {
 
    @GetMapping("/barcode")
    public void generateBarcode(
            @RequestParam("text") String text,
            HttpServletRequest request,
            HttpServletResponse response) throws IOException {
        String googleChartUrl = "https://chart.googleapis.com/chart?" +
                "cht=bar&" +
                "chs=300x100&" +
                "choe=UTF-8&" +
                "chld=L|4&" +
                "chl=" + URLEncoder.encode(text, "UTF-8");
 
        URL url = new URL(googleChartUrl);
        try (InputStream in = url.openStream()) {
            response.setContentType("image/png");
            response.setContentLength(in.available());
 
            byte[] buffer = new byte[4096];
            int bytesRead = -1;
            while ((bytesRead = in.read(buffer)) != -1) {
                response.getOutputStream().write(buffer, 0, bytesRead);
            }
        }
    }
}

3. 访问/barcode端点并提供text参数，例如：http://localhost:8080/barcode?text=1234567890，将