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minio的public桶因为没有限制，所以在直接访问到桶地址的时候会列出桶内所有文件的url，这样很不安全，如何禁止这个功能，可以使用三种方法
1、如果是新版的可以直接设置桶的Access Policy为自定义就好
编辑custom的Policy，去掉Action集合中的ListBucket就可以了，如下是去掉后的json
{"Version": "2012-10-17","Statement": [{"Effect": "Allow","Principal": {"AWS": ["*"]},"Action": ["s3:GetBucketLocation","s3:ListBucketMultipartUploads"],"Resource": ["arn:aws:s3:::桶名称"]},{"Effect": "Allow","Principal": {"AWS": ["*"]},"Action": ["s3:AbortMultipartUpload","s3:DeleteObject","s3:GetObject","s3:ListMultipartUploadParts","s3:PutObject"],"Resource": ["arn:aws:s3:::桶名称/*"]}]
}设置完后
2、有些minio版本不支持直接设置，那就要通过minio Client设置桶的custom的Policy了
下载地址：http://dl.minio.org.cn/client/mc/release/linux-amd64/mc
下载后放到服务器上，然后根据以下命令运行即可
（1）添加连接服务
./mc config host add minio http://127.0.0.1:9000 用户名 密码
（2）查看已连接的服务，查看上步添加的minio连接服务是否成功
./mc config host list
（3）置PUBLIC桶的访问权限
./mc anonymous set-json /home/aadata/minio/自定义桶的Policy的json文件.json minio/桶名
自定义桶的Policy的json文件.json文件如下
{"Version": "2012-10-17","Statement": [{"Effect": "Allow","Principal": {"AWS": ["*"]},"Action": ["s3:GetBucketLocation","s3:ListBucketMultipartUploads"],"Resource": ["arn:aws:s3:::桶名"]},{"Effect": "Allow","Principal": {"AWS": ["*"]},"Action": ["s3:AbortMultipartUpload","s3:DeleteObject","s3:GetObject","s3:ListMultipartUploadParts","s3:PutObject"],"Resource": ["arn:aws:s3:::桶名/*"]}]
}（4）删除第一部添加的服务
./mc config host remove minio
3、直接代码中实现设置桶的Policy，参照下面代码自行理解吧
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;import io.minio.*;
import io.minio.http.Method;public class Minio {/*** minio参数*/private static final String ENDPOINT = "http://127.0.0.1:9000";private static final String ACCESS_KEY = "******";private static final String SECRET_KEY = "******";/*** 桶占位符*/private static final String BUCKET_PARAM = "${bucket}";/*** bucket权限-只读*/private static final String READ_ONLY = "{\"Version\":\"2012-10-17\",\"Statement\":[{\"Effect\":\"Allow\",\"Principal\":{\"AWS\":[\"*\"]},\"Action\":[\"s3:GetBucketLocation\",\"s3:ListBucket\"],\"Resource\":[\"arn:aws:s3:::" + BUCKET_PARAM + "\"]},{\"Effect\":\"Allow\",\"Principal\":{\"AWS\":[\"*\"]},\"Action\":[\"s3:GetObject\"],\"Resource\":[\"arn:aws:s3:::" + BUCKET_PARAM + "/*\"]}]}";/*** bucket权限-只读*/private static final String WRITE_ONLY = "{\"Version\":\"2012-10-17\",\"Statement\":[{\"Effect\":\"Allow\",\"Principal\":{\"AWS\":[\"*\"]},\"Action\":[\"s3:GetBucketLocation\",\"s3:ListBucketMultipartUploads\"],\"Resource\":[\"arn:aws:s3:::" + BUCKET_PARAM + "\"]},{\"Effect\":\"Allow\",\"Principal\":{\"AWS\":[\"*\"]},\"Action\":[\"s3:AbortMultipartUpload\",\"s3:DeleteObject\",\"s3:ListMultipartUploadParts\",\"s3:PutObject\"],\"Resource\":[\"arn:aws:s3:::" + BUCKET_PARAM + "/*\"]}]}";/*** bucket权限-读写*/private static final String READ_WRITE = "{\"Version\":\"2012-10-17\",\"Statement\":[{\"Effect\":\"Allow\",\"Principal\":{\"AWS\":[\"*\"]},\"Action\":[\"s3:GetBucketLocation\",\"s3:ListBucket\",\"s3:ListBucketMultipartUploads\"],\"Resource\":[\"arn:aws:s3:::" + BUCKET_PARAM + "\"]},{\"Effect\":\"Allow\",\"Principal\":{\"AWS\":[\"*\"]},\"Action\":[\"s3:DeleteObject\",\"s3:GetObject\",\"s3:ListMultipartUploadParts\",\"s3:PutObject\",\"s3:AbortMultipartUpload\"],\"Resource\":[\"arn:aws:s3:::" + BUCKET_PARAM + "/*\"]}]}";/*** 文件url前半段** @param bucket 桶* @return 前半段*/public static String getObjectPrefixUrl(String bucket) {return String.format("%s/%s/", ENDPOINT, bucket);}/*** 创建桶** @param bucket 桶*/public static void makeBucket(String bucket) throws Exception {MinioClient client = MinioClient.builder().endpoint(ENDPOINT).credentials(ACCESS_KEY, SECRET_KEY).build();// 判断桶是否存在boolean isExist = client.bucketExists(BucketExistsArgs.builder().bucket(bucket).build());if (!isExist) {// 新建桶client.makeBucket(MakeBucketArgs.builder().bucket(bucket).build());}}/*** 更新桶权限策略** @param bucket 桶* @param policy 权限*/public static void setBucketPolicy(String bucket, String policy) throws Exception {MinioClient client = MinioClient.builder().endpoint(ENDPOINT).credentials(ACCESS_KEY, SECRET_KEY).build();switch (policy) {case "read-only":client.setBucketPolicy(SetBucketPolicyArgs.builder().bucket(bucket).config(READ_ONLY.replace(BUCKET_PARAM, bucket)).build());break;case "write-only":client.setBucketPolicy(SetBucketPolicyArgs.builder().bucket(bucket).config(WRITE_ONLY.replace(BUCKET_PARAM, bucket)).build());break;case "read-write":client.setBucketPolicy(SetBucketPolicyArgs.builder().bucket(bucket).config(READ_WRITE.replace(BUCKET_PARAM, bucket)).build());break;case "none":default:break;}}/*** 上传本地文件** @param bucket 桶* @param objectKey 文件key* @param filePath 文件路径* @return 文件url*/public static String uploadFile(String bucket, String objectKey, String filePath) throws Exception {MinioClient client = MinioClient.builder().endpoint(ENDPOINT).credentials(ACCESS_KEY, SECRET_KEY).build();client.uploadObject(UploadObjectArgs.builder().bucket(bucket).object(objectKey).filename(filePath).contentType("image/png").build());return getObjectPrefixUrl(bucket) + objectKey;}/*** 流式上传文件** @param bucket 桶* @param objectKey 文件key* @param inputStream 文件输入流* @return 文件url*/public static String uploadInputStream(String bucket, String objectKey, InputStream inputStream) throws Exception {MinioClient client = MinioClient.builder().endpoint(ENDPOINT).credentials(ACCESS_KEY, SECRET_KEY).build();client.putObject(PutObjectArgs.builder().bucket(bucket).object(objectKey).stream(inputStream, inputStream.available(), -1).contentType("image/png").build());return getObjectPrefixUrl(bucket) + objectKey;}/*** 下载文件** @param bucket 桶* @param objectKey 文件key* @return 文件流*/public static InputStream download(String bucket, String objectKey) throws Exception {MinioClient client = MinioClient.builder().endpoint(ENDPOINT).credentials(ACCESS_KEY, SECRET_KEY).build();return client.getObject(GetObjectArgs.builder().bucket(bucket).object(objectKey).build());}/*** 文件复制** @param sourceBucket 源桶* @param sourceObjectKey 源文件key* @param bucket 桶* @param objectKey 文件key* @return 新文件url*/public static String copyFile(String sourceBucket, String sourceObjectKey, String bucket, String objectKey) throws Exception {MinioClient client = MinioClient.builder().endpoint(ENDPOINT).credentials(ACCESS_KEY, SECRET_KEY).build();CopySource source = CopySource.builder().bucket(sourceBucket).object(sourceObjectKey).build();client.copyObject(CopyObjectArgs.builder().bucket(bucket).object(objectKey).source(source).build());return getObjectPrefixUrl(bucket) + objectKey;}/*** 删除文件** @param bucket 桶* @param objectKey 文件key*/public static void deleteFile(String bucket, String objectKey) throws Exception {MinioClient client = MinioClient.builder().endpoint(ENDPOINT).credentials(ACCESS_KEY, SECRET_KEY).build();client.removeObject(RemoveObjectArgs.builder().bucket(bucket).object(objectKey).build());}/*** 获取文件签名url** @param bucket 桶* @param objectKey 文件key* @param expires 签名有效时间 单位秒* @return 文件签名地址*/public static String getSignedUrl(String bucket, String objectKey, int expires) throws Exception {MinioClient client = MinioClient.builder().endpoint(ENDPOINT).credentials(ACCESS_KEY, SECRET_KEY).build();return client.getPresignedObjectUrl(GetPresignedObjectUrlArgs.builder().method(Method.GET).bucket(bucket).object(objectKey).expiry(expires).build());}public static void main(String[] args) {String bucket = "public";String objectKey = "demo/123.png";try {// 创建桶makeBucket(bucket);// 设置桶读写权限setBucketPolicy(bucket, "read-write");// 上传本地文件String url1 = uploadFile(bucket, objectKey, "D://123.png");// 输出 http://127.0.0.1:9000/demo/123.pngSystem.out.println(url1);// 上传文件流String url2 = uploadInputStream(bucket, objectKey, new FileInputStream(new File("D://123.png")));// 输出 http://127.0.0.1:9000/demo/123.pngSystem.out.println(url2);// 下载文件InputStream inputStream = download(bucket, objectKey);// 文件复制String url3 = copyFile(bucket, objectKey, "test", "test/abc.png");// 输出 http://127.0.0.1:9000/test/abc.pngSystem.out.println(url3);// 删除文件deleteFile("test", "test/abc.png");// 获取文件签名urlString sign = getSignedUrl(bucket, objectKey, 600);// 该路径可访问文件五分钟System.out.println(sign);} catch (Exception e) {e.printStackTrace();}}
}