`server.servlet.session.persistent` 的默认值是什么？

Question

我从Spring Boot文档中看到server.servlet.session.persistent选项的默认值为false，但在我的应用程序中它是true，这很奇怪，因为我没有显式地修改它。我猜测可能是Spring Security、Spring Session或Spring Redis集成将其变为true。也许有人知道这种行为的根源?

P.S. 我使用的是Spring Boot 2.1.5.

我的pom XML。

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>ru.geekmarket</groupId>
    <artifactId>geek-market-ui</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>geek-market-ui</name>
    <description>Geek market e-commerce study project</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.thymeleaf.extras</groupId>
            <artifactId>thymeleaf-extras-springsecurity5</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.session</groupId>
            <artifactId>spring-session-data-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>io.lettuce</groupId>
            <artifactId>lettuce-core</artifactId>
            <version>5.1.7.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.liquibase</groupId>
            <artifactId>liquibase-core</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
                <includes>
                    <include>*.properties</include>
                </includes>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>false</filtering>
                <includes>
                    <include>**/static/**/*.*</include>
                    <include>**/templates/**/*.*</include>
                    <include>**/db/**/*.*</include>
                </includes>
            </resource>
        </resources>

        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>

            <plugin>
                <groupId>org.liquibase</groupId>
                <artifactId>liquibase-maven-plugin</artifactId>
                <version>3.5.5</version>
                <configuration>
                    <propertyFile>${project.build.outputDirectory}/liquibase-maven-plugin.properties</propertyFile>
                    <systemProperties>
                        <user.name>aleks_usharovskii</user.name>
                    </systemProperties>
                    <logging>info</logging>
                </configuration>
                <dependencies>
                    <dependency>
                        <groupId>org.liquibase.ext</groupId>
                        <artifactId>liquibase-hibernate5</artifactId>
                        <version>3.6</version>
                    </dependency>
                    <dependency>
                        <groupId>org.springframework.boot</groupId>
                        <artifactId>spring-boot-starter-data-jpa</artifactId>
                        <version>2.1.5.RELEASE</version>
                    </dependency>
                    <dependency>
                        <groupId>javax.validation</groupId>
                        <artifactId>validation-api</artifactId>
                        <version>2.0.1.Final</version>
                    </dependency>
                    <dependency>
                        <groupId>org.javassist</groupId>
                        <artifactId>javassist</artifactId>
                        <version>3.24.0-GA</version>
                    </dependency>
                    <dependency>
                        <groupId>org.yaml</groupId>
                        <artifactId>snakeyaml</artifactId>
                        <version>1.12</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>

</project>

- Alexey Usharovski

---

Spring Boot中的默认值 https://docs.spring.io/spring-boot/docs/current/reference/html/common-application-properties.html - Alexey Usharovski

请问您能分享一下您的pom.xml文件吗？ - Mohit Sharma

完成。整个项目在这里 https://github.com/usharik/SpringBootPart2/blob/master/geek-market-ui - Alexey Usharovski

Answer 1

server.servlet.session.persistent属性默认值为false。然而，当使用spring-devtools时会被重写并设置为true（我认为是因为其重新启动/热加载功能）。

如果您不需要会话持久化，请在application.properties文件中或与您的开发配置文件相对应的属性文件中直接禁用它。

您可以在Github上查看源代码，spring-devtools会在Spring环境中设置多个属性：

static {
    Map<String, Object> properties = new HashMap<>();
    properties.put("spring.thymeleaf.cache", "false");
    properties.put("spring.freemarker.cache", "false");
    properties.put("spring.groovy.template.cache", "false");
    properties.put("spring.mustache.cache", "false");
    properties.put("server.servlet.session.persistent", "true");
    properties.put("spring.h2.console.enabled", "true");
    properties.put("spring.resources.cache.period", "0");
    properties.put("spring.resources.chain.cache", "false");
    properties.put("spring.template.provider.cache", "false");
    properties.put("spring.mvc.log-resolved-exception", "true");
    properties.put("server.error.include-stacktrace", "ALWAYS");
    properties.put("server.servlet.jsp.init-parameters.development", "true");
    properties.put("spring.reactor.debug", "true");
    PROPERTIES = Collections.unmodifiableMap(properties);
}

- Spiegelritter