https://www.amitph.com/spring-webclient-large-file-download/https://github.com/amitrp/spring-examples/blob/main/spring-webflux-webclient/src/main/java/com/amitph/spring/webclients/service/FileDownloaderWebClientService.javaimport lombok.RequiredArgsConstructor;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.stereotype.Service;
import org.springframework.web.reactive.function.client.WebClient;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import java.util.Objects;
@Service
@RequiredArgsConstructor
public class FileDownloaderWebClientService {
private final WebClient webClient;
/**
* Reads the complete file in-memory. Thus, only useful for very large file
*/
public void downloadUsingByteArray(Path destination) throws IOException {
Mono<byte[]> monoContents = webClient
.get()
.uri("/largefiles/1")
.retrieve()
.bodyToMono(byte[].class);
Files.write(destination, Objects.requireNonNull(monoContents.share().block()),
StandardOpenOption.CREATE);
}
/**
* Reading file using Mono will try to fit the entire file into the DataBuffer.
* Results in exception when the file is larger than the DataBuffer capacity.
*/
public void downloadUsingMono(Path destination) {
Mono<DataBuffer> dataBuffer = webClient
.get()
.uri("/largefiles/1")
.retrieve()
.bodyToMono(DataBuffer.class);
DataBufferUtils.write(dataBuffer, destination,
StandardOpenOption.CREATE)
.share().block();
}
/**
* Having using Flux we can download files of any size safely.
* Optionally, we can configure DataBuffer capacity for better memory utilization.
*/
public void downloadUsingFlux(Path destination) {
Flux<DataBuffer> dataBuffer = webClient
.get()
.uri("/largefiles/1")
.retrieve()
.bodyToFlux(DataBuffer.class);
DataBufferUtils.write(dataBuffer, destination,
StandardOpenOption.CREATE)
.share().block();
}
}
列出某个软件的所有版本号：
yum module list nginx
Red Hat Enterprise Linux 8 for x86_64 - AppStream (RPMs)
Name Stream Profiles Summary
nginx 1.14 [d] common [d] nginx webserver
nginx 1.16 common [d] nginx webserver
nginx 1.18 common [d] nginx webserver
nginx 1.20 [e] common [d] nginx webserver
Hint: [d]efault, [e]nabled, [x]disabled, [i]nstalled
设定某个版本为默认版本
yum module enable nginx:1.20
安装默认版本
yum install nginx
摘要: 签名
为防止request中的json在传输过程中被更改，
需要在传送双方保存一个字符串sinature-key
用SHA256 hash请求中的json字符串，结果为hash1
{"payload":hash1}以此为字符和sinature-key用JWS HS256算法进行签名，得到sinature1
在请求的json中加入字段："sina...
阅读全文
下载KEYCLOAK与安装，可参见：
https://www.janua.fr/how-to-install-keycloak-with-mariadb/启动时配置不通过localhost访问控制台：
#! /bin/bash
BIN_PATH=$(cd `dirname $0`; pwd)
IP=10.10.27.69
KEYCLOAK_OPT="-b ${IP} -Djboss.bind.address.management=${IP} -Dkeycloak.profile.feature.upload_scripts=enabled"
KEYCLOAK_OPT="${KEYCLOAK_OPT} -Djboss.socket.binding.port-offset=100 -Dkeycloak.frontendUrl=http://${IP}:81/auth "
#-Dkeycloak.hostname=${IP} -Dkeycloak.httpPort=81 -Dkeycloak.httpsPort=82
nohup ${BIN_PATH}/bin/standalone.sh ${KEYCLOAK_OPT} > /dev/null &
更改KEYCLOAK的DATASOURCE时，可直接更改默认的而无需重新配置：
https://medium.com/@pratik.dandavate/setting-up-keycloak-standalone-with-mysql-database-7ebb614cc229KEYCLOAK的JBOSS管理界面地址改为非LOCALHOST：
-Djboss.bind.address.management=${IP}
如果是由NGINX过来的访问，这样前端的地址是和默认的不一样，需配置前端URL：
-Dkeycloak.frontendUrl=http://${IP}:81/auth
更改JVM大小standalone.conf：
#
# Specify options to pass to the Java VM.
#
JBOSS_JAVA_SIZING="-server -Xms3G -Xmx3G -Xmn512m -XX:MetaspaceSize=96M -XX:MaxMetaspaceSize=256m"
REFERENCE:
https://www.keycloak.org/docs/latest/server_installation/index.html#_hostname