我正在使用 spring boot、hibernate 和 MySql。在运行应用程序时，它按预期运行良好。但是在制作 docker-compose 文件并使用 mysql docker 镜像运行应用程序 docker 镜像时，它会出现此错误。
错误 com.mysql.jdbc.exceptions.jdbc4.CommunicationsException：通信链接失败 java.net.ConnectException：连接被拒绝。
private Connection createConnection() throws SQLException
{
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
String mysqlUrl = "jdbc:mysql://localhost/database?autoReconnect=true&useSSL=false";
Connection connection = DriverManager.getConnection(mysqlUrl, "root", "root");
return connection;
}
应用程序属性
spring.datasource.url=jdbc:mysql://localhost/database?autoReconnect=true&useSSL=false spring.datasource.username=root
spring.datasource.password=root
请指导我如何解决这个问题。
**docker-compose.yml**
version: '3'
services:
docker-mysql:
image: mysql:5.7
environment:
- MYSQL_ROOT_PASSWORD=root
- MYSQL_DATABASE=database
- MYSQL_USER=root
- MYSQL_PASSWORD=root
ports:
- 3307:3306
app:
image: app:latest
ports:
- 8091:8091
depends_on:
- docker-mysql
我正在 Spring Boot 中通过 smtp.gmail 发送电子邮件。
电子邮件配置文件
@Configuration
public class EmailConfig
{
@Bean
public JavaMailSender getJavaMailSender()
{
JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
mailSender.setHost("smtp.gmail.com");
mailSender.setPort(25);
mailSender.setUsername("abc@gmail.com");
mailSender.setPassword("123");
Properties props = mailSender.getJavaMailProperties();
props.put("mail.transport.protocol", "smtp");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.debug", "true");
return mailSender;
}
@Bean
public SimpleMailMessage emailTemplate()
{
SimpleMailMessage message = new SimpleMailMessage();
message.setTo("abc@gmail.com");
message.setFrom("johndoe@gmail.com");
message.setText("FATAL - Application crash. Save your job !!");
return message;
}
}
发送电子邮件服务.java
@Service("emailService")
public class SendEmailService {
@Autowired
JavaMailSender mailSender;
@Autowired
private SimpleMailMessage preConfiguredMessage;
public void …我正在按照构建https://github.com/Baeldung/spring-security-registration的文章使用 spring security 进行注册处理。根据本文，HTML页面接受输入并将其插入到数据库中。
我正在前端使用 Flutter 应用程序。我希望当用户请求重置密码时，一个链接被发送到用户的电子邮件，当用户点击验证链接时，它将创建一个会话并重定向到应用程序上的 UI 页面以编写新密码。当用户输入新密码时，它将更新该用户的密码。
更新密码.html
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css"/>
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"/>
<style>
.password-verdict{
color:#000;
}
</style>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script th:src="@{/resources/pwstrength.js}"></script>
<title th:text="#{message.updatePassword}">update password</title>
</head>
<body>
<div sec:authorize="hasAuthority('CHANGE_PASSWORD_PRIVILEGE')">
<div class="container">
<div class="row">
<h1 th:text="#{message.resetYourPassword}">reset</h1>
<form>
<br/>
<label class="col-sm-2" th:text="#{label.user.password}">password</label>
<span class="col-sm-5"><input class="form-control" id="password" name="newPassword" type="password"
value=""/></span>
<div class="col-sm-12"></div>
<br/><br/>
<label class="col-sm-2" th:text="#{label.user.confirmPass}">confirm</label>
<span class="col-sm-5"><input class="form-control" id="matchPassword" type="password" value=""/></span>
<div id="globalError" class="col-sm-12 …首先，我使用的是 spring-boot 版本 1.5.x，我的应用程序运行良好。我升级到 spring-boot 2.1.6 并且在 spring-boot security 中出现错误。这是我的 logcat
org.springframework.beans.factory.BeanDefinitionStoreException: Failed to process import candidates for configuration class [com.technohomes.user.UserApplication]; nested exception is java.io.FileNotFoundException: class path resource [org/springframework/boot/autoconfigure/web/ServerPropertiesAutoConfiguration.class] cannot be opened because it does not exist
at org.springframework.context.annotation.ConfigurationClassParser.processImports(ConfigurationClassParser.java:596) ~[spring-context-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.access$900(ConfigurationClassParser.java:108) ~[spring-context-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorGroupingHandler.lambda$processGroupImports$1(ConfigurationClassParser.java:805) ~[spring-context-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at java.util.ArrayList.forEach(ArrayList.java:1257) ~[na:1.8.0_212]
at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorGroupingHandler.processGroupImports(ConfigurationClassParser.java:801) ~[spring-context-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser$DeferredImportSelectorHandler.process(ConfigurationClassParser.java:771) ~[spring-context-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:185) ~[spring-context-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:315) ~[spring-context-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:232) ~[spring-context-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:275) ~[spring-context-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:95) ~[spring-context-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:705) ~[spring-context-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:531) ~[spring-context-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.1.6.RELEASE.jar:2.1.6.RELEASE]
at …我想使用以下代码将字符串存储到 CSV 文件中，但正在生成空的 CSV。
代码
try {
PrintWriter writer = new PrintWriter(new File("test.csv"));
StringBuilder sb = new StringBuilder();
String str ="1 cup, honey, 2 tablespoons ,canola" ;
sb.append(str);
writer.write(String.valueOf(sb));
} catch (FileNotFoundException e) {
System.out.println(e.getMessage());
}
预期输出：
数据应在 CSV 文件中显示如下。
1杯
蜂蜜
2汤匙
油菜
我怎么能得到预期的结果。？
我一直在使用 Spring Boot 和 Docker。我曾经在 JAVA 8 上构建应用程序的 docker 镜像。但现在我需要构建使用 JAVA 11 的应用程序的 docker 镜像。请指导我。
文件
FROM openjdk:8u121-jdk-alpine
ENV APP_JAR_NAME applicationTest
RUN apk --update add curl bash &&
rm -rf /var/cache/apk/*
RUN mkdir /app
ADD ${APP_JAR_NAME}.jar /app/
ADD run.sh /app/
RUN chmod +x /app/run.sh
WORKDIR /app
EXPOSE 8080
ENTRYPOINT ["/bin/bash","-c"]
CMD ["/app/run.sh"]
请求 请分享我可用于构建JAVA 11 docker 镜像的 Dockerfile
我正在使用 Elasticsearch 7.3 并且无法将其连接到我的 Spring boot 应用程序以使用ElasticsearchRepository.
@Configuration
public class ElasticSearchConfig {
@Value("${elasticsearch.host:localhost}")
public String host;
@Value("${elasticsearch.port:9300}")
public int port;
public String getHost() {
return host;
}
public int getPort() {
return port;
}
private int timeout = 60;
@Bean
public RestHighLevelClient client() {
System.out.println("host:" + host + "port:" + port);
final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials("elastic", "changeme"));
RestClientBuilder builder = RestClient.builder(new HttpHost("localhost", 9200, "http")).setHttpClientConfigCallback(httpClientBuilder -> httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider));
builder.setRequestConfigCallback(requestConfigBuilder -> requestConfigBuilder.setConnectTimeout(timeout * 1000).setSocketTimeout(timeout * 1000)
.setConnectionRequestTimeout(0)); …spring elasticsearch spring-boot spring-data-elasticsearch resthighlevelclient
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