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有没有办法将字符串数组转换为 S3 策略,以便我可以将它传递给客户端以将文件直接上传到 S3。

我发现jets3t具有创建条件的库,但它没有任何功能仅用于构建策略。有没有一种方法可以以andcondition的形式创建策略?string arrayexpiration date

private String generatePolicy(String assetKey, String contentType){
    String[] conditions = {
            S3Service.generatePostPolicyCondition_Equality("key", assetKey),
            S3Service.generatePostPolicyCondition_Equality("Content-Type", contentType),
            S3Service.generatePostPolicyCondition_Equality("acl", "public-read"),
            //S3Service.generatePostPolicyCondition_Equality("success_action_redirect", value)
    };
  Date expiration = createDateNHoursFromNow(24);
  // return S3Service.buildPolicy(expiration, condition); (which doesn't exit)
}
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