leaflet hello world

腾讯云COS java sdk 上传图片示例

引入pom

引入java sdk的pom

<dependency>
    <groupId>com.qcloud</groupId>
    <artifactId>cos_api</artifactId>
    <version>5.4.5</version>
</dependency>

注意事项

引入后如果有 NoClassDefFoundError 异常，则检查项目引入和Apache http组件版本号是否和 cos_api 内部引用的一致，以及引入顺序。我的如下：

<dependency>
    <groupId>com.qcloud</groupId>
    <artifactId>cos_api</artifactId>
    <version>5.4.5</version>
</dependency>
<!-- http请求 s -->
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.3</version>
</dependency>
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpcore</artifactId>
    <version>4.4.6</version>
</dependency>
<!-- http请求 e-->

处理图片

处理图片base64字符串

图片base64字符串默认有 data:image/{xxx};base64, (xxx为图片格式) 这样的字符开头，如果直接带着转为图片是打不开的，需要处理。处理方法如下：

public class ImgUtil {
    private static String IMG_TYPE = "jpg,png,jpeg";

    /**
     * @param imgString 图片base64
     * @return java.lang.String
     * @author cuishilei
     * @date 2018/9/21
     */
    public static String checkBase64Type(String imgString) {
        String[] imgTypes = IMG_TYPE.split(",");
        String regex;
        for (String v : imgTypes) {
            regex = MessageFormat.format("data:image/{0};base64,", v);
            if (imgString.contains(regex)) {
                return v;
            }
        }
        return null;
    }

    /**
     * @param imgString 图片base64
     * @return java.lang.String
     * @author cuishilei
     * @date 2018/9/21
     */
    public static String replaceBase64Pre(String imgString) {
        String[] imgTypes = IMG_TYPE.split(",");
        Pattern pattern;
        Matcher matcher;
        String regex;
        for (String v : imgTypes) {
            regex = MessageFormat.format("data:image/{0};base64,", v);
            if (imgString.contains(regex)) {
                return imgString.replaceAll(regex, "");
            }
        }
        return imgString;
    }
}

base64 转 inputstream 注意事项

通过网络 post 传到 web 后台的base64串中的 + 号会变为空格，需要处理

BASE64Decoder decoder = new BASE64Decoder();
byte[] bytes = decoder.decodeBuffer(imgData);
//调整异常数据
for (int i = 0; i < bytes.length; ++i) {
    if (bytes[i] < 0) {
        bytes[i] += 256;
    }
}

调用 sdk 上传图片

接入 sdk 的 spring 组件代码如下：

@Slf4j
@Component
public class QcloudXmlApi {
    @Value("${qcloud.appId}")
    private String appId;

    @Value("${qcloud.secretId}")
    private String secretId;

    @Value("${qcloud.secretKey}")
    private String secretKey;

    @Value("${qcloud.bucketName}")
    private String bucketName;

    @Value("${qcloud.region}")
    private String region;

    @Value("${qcloud.path}")
    private String path;

    @Value("${qcloud.baseUrl}")
    private String baseUrl;

    private COSClient cosclient;

    @PostConstruct
    public void init() {
        // 1 初始化用户身份信息(secretId, secretKey)
        COSCredentials cred = new BasicCOSCredentials(secretId, secretKey);
        // 2 设置bucket的区域
        ClientConfig clientConfig = new ClientConfig(new Region(region));
        // 3 生成cos客户端
        cosclient = new COSClient(cred, clientConfig);
    }

    /**
     * 上传图片
     *
     * @param inputStream    输入流
     * @param uploadFileName 远程文件名，不必带后缀
     * @param suffix         文件后缀
     * @return com.reward.bean.ResultInfo<java.lang.String>
     * @author cuishilei
     * @date 2018/9/21
     */
    public ResultInfo<String> uploadImg(InputStream inputStream, String uploadFileName, String suffix) {
        ResultInfo<String> resultInfo = new ResultInfo<>();
        try {
            String filePath = path + uploadFileName + "." + suffix;
            ObjectMetadata objectMetadata = new ObjectMetadata();
            // 从输入流上传必须制定content length, 否则http客户端可能会缓存所有数据，存在内存OOM的情况
            objectMetadata.setContentLength(inputStream.available());
            // 默认下载时根据cos路径key的后缀返回响应的contenttype, 上传时设置contenttype会覆盖默认值
            objectMetadata.setContentType("image/" + suffix);

            PutObjectRequest putObjectRequest =
                    new PutObjectRequest(bucketName + "-" + appId, filePath, inputStream, objectMetadata);
            // 设置存储类型, 默认是标准(Standard), 低频(standard_ia)
            putObjectRequest.setStorageClass(StorageClass.Standard);
            PutObjectResult putObjectResult = cosclient.putObject(putObjectRequest);
            resultInfo.setData(baseUrl + filePath);
        } catch (Exception e) {
            resultInfo.fail(e.getMessage());
            log.error("error", e);
        } finally {
            // 关闭客户端
            cosclient.shutdown();
        }
        return resultInfo;
    }
}

使用 demo

@RequestMapping(value = "/uploadBase64", produces = "application/json;charset=UTF-8")
@ResponseBody
public ResultInfo uploadBase64(@RequestParam(value = "imgData") String imgData) {
    ResultInfo resultInfo = new ResultInfo();
    try {
        //检查文件格式
        String checkType = ImgUtil.checkBase64Type(imgData);
        if (checkType == null) {
            resultInfo.fail("不支持的图片格式！");
        }
        //处理 base64 前缀
        imgData = ImgUtil.replaceBase64Pre(imgData);
        BASE64Decoder decoder = new BASE64Decoder();
        byte[] bytes = decoder.decodeBuffer(imgData);
        //调整异常数据
        for (int i = 0; i < bytes.length; ++i) {
            if (bytes[i] < 0) {
                bytes[i] += 256;
            }
        }
        InputStream stream = new ByteArrayInputStream(bytes);
        //上传
        resultInfo = qcloudXmlApi.uploadImg(stream, "lalala", checkType);
    } catch (Exception e) {
        log.error("上传图片失败", e);
        resultInfo.fail("上传图片失败，请稍候再试！");
    }
    return resultInfo;
}

结束。

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