说明：plistFile是一段xml文本，转换成InputStream; bucketName;accessKey,secretKey是从属性文件获取
Properties proper = new Properties();
proper.load(in);
String bucketName = proper.getProperty("bucketName");
String accessKey = proper.getProperty("accessKey");
String secretKey = proper.getProperty("secretKey");
String https = proper.getProperty("plistHttps");
System.out.println("accessKey========="+accessKey);
System.out.println("https========="+https);

        Mac mac = new Mac(accessKey, secretKey);
        // 请确保该bucket已经存在
        PutPolicy putPolicy = new PutPolicy(bucketName);
        String uptoken = putPolicy.token(mac);
        PutExtra extra = new PutExtra();
        String key = "";
        InputStream is = new ByteArrayInputStream(plistFile.getBytes());
        extra.mimeType = "application/xml";

        PutRet ret = IoApi.Put(uptoken, "xx.xml", is, extra);