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社区首页 >问答首页 >弹簧启动属性注入失败

弹簧启动属性注入失败
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Stack Overflow用户
提问于 2019-03-14 07:44:22
回答 2查看 1.9K关注 0票数 3

我试图在spring引导项目上添加一个使用注入的属性。请查看token变量。如果我硬编码令牌,没有@Value,它就能工作,并设法被部署到Wildfly (JBoss)上。

我已经证实了lms.token存在于application.properties lms.token=sometokenvalue中。我在用:

  • spring-boot-2.1.2.RELEASE.jar
  • spring-core-5.1.2.RELEASE.jar
代码语言:javascript
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@Service
@Transactional
public class VaultLMSImpl implements LMSService {
    protected final Log logger = LogFactory.getLog(VaultLMSImpl.class);

    @Value("${lms.token}")
    private String token;

    @Autowired
    private Endpoint endpoint;
}
代码语言:javascript
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{"WFLYCTL0080: Failed services" => {"jboss.undertow.deployment.default-server.default-host./lms" => "org.jboss.msc.service.StartException in service jboss.undertow.deployment.default-server.default-host./lms: java.lang.RuntimeException: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'LMSAPI': Unsatisfied dependency expressed through field 'lmsService';
 nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'vaultLMSImpl': Injection of autowired dependencies failed;
 nested exception is java.lang.IllegalAccessError: tried to access method org.springframework.core.convert.TypeDescriptor.<init>(Lorg/springframework/core/ResolvableType;
Ljava/lang/Class;
[Ljava/lang/annotation/Annotation;
)V from class org.springframework.beans.factory.config.DependencyDescriptor
    Caused by: java.lang.RuntimeException: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'LMSAPI': Unsatisfied dependency expressed through field 'lmsService';
 nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'vaultLMSImpl': Injection of autowired dependencies failed;
 nested exception is java.lang.IllegalAccessError: tried to access method org.springframework.core.convert.TypeDescriptor.<init>(Lorg/springframework/core/ResolvableType;
Ljava/lang/Class;
[Ljava/lang/annotation/Annotation;
)V from class org.springframework.beans.factory.config.DependencyDescriptor
    Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'LMSAPI': Unsatisfied dependency expressed through field 'lmsService';
 nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'vaultLMSImpl': Injection of autowired dependencies failed;
 nested exception is java.lang.IllegalAccessError: tried to access method org.springframework.core.convert.TypeDescriptor.<init>(Lorg/springframework/core/ResolvableType;
Ljava/lang/Class;
[Ljava/lang/annotation/Annotation;
)V from class org.springframework.beans.factory.config.DependencyDescriptor
    Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'vaultLMSImpl': Injection of autowired dependencies failed;
 nested exception is java.lang.IllegalAccessError: tried to access method org.springframework.core.convert.TypeDescriptor.<init>(Lorg/springframework/core/ResolvableType;
Ljava/lang/Class;
[Ljava/lang/annotation/Annotation;
)V from class org.springframework.beans.factory.config.DependencyDescriptor
    Caused by: java.lang.IllegalAccessError: tried to access method org.springframework.core.convert.TypeDescriptor.<init>(Lorg/springframework/core/ResolvableType;
Ljava/lang/Class;
[Ljava/lang/annotation/Annotation;
)V from class org.springframework.beans.factory.config.DependencyDescriptor"},
"WFLYCTL0412: Required services that are not installed:" => ["jboss.undertow.deployment.default-server.default-host./lms"],
"WFLYCTL0180: Services with missing/unavailable dependencies" => undefined}

我在这里错过了什么?

Pom文件如下:

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<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.ramen.maple</groupId>
    <artifactId>kms</artifactId>
    <version>2018.arch</version>
    <packaging>war</packaging>
    <name>LMS Webapp</name>
    <parent>
        <groupId>com.ramen.maple</groupId>
        <artifactId>services</artifactId>
        <version>2018.arch</version>
    </parent>
    <profiles>
        <!-- Profile for excluding local confs -->
        <profile>
            <id>exclusions</id>
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
            <build>
                <resources>
                    <resource>
                        <directory>src/main/resources/</directory>
                        <excludes>
                            <exclude>local-conf/**</exclude>
                        </excludes>
                    </resource>
                </resources>
            </build>
        </profile>
        <profile>
            <id>integration</id>
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
            <dependencies>
                <dependency>
                    <groupId>org.wildfly.arquillian</groupId>
                    <artifactId>wildfly-arquillian-container-managed</artifactId>
                    <version>${wildfly-arquillian-container-managed.version}</version>
                    <scope>test</scope>
                </dependency>
            </dependencies>
            <!-- This optional build configuration downloads and extracts JBoss AS 
                automatically -->
            <!-- Remove it if you want to use an existing installation defined by 
                the JBOSS_HOME environment variable -->
            <build>
                <plugins>
                    <plugin>
                        <artifactId>maven-dependency-plugin</artifactId>
                        <executions>
                            <execution>
                                <id>unpack</id>
                                <phase>process-resources</phase>
                                <goals>
                                    <goal>unpack</goal>
                                </goals>
                                <configuration>
                                    <artifactItems>
                                        <artifactItem>
                                            <groupId>org.wildfly</groupId>
                                            <artifactId>wildfly-dist</artifactId>
                                            <version>${wildfly.version}</version>
                                            <type>zip</type>
                                            <overWrite>false</overWrite>
                                            <outputDirectory>target</outputDirectory>
                                        </artifactItem>
                                    </artifactItems>
                                </configuration>
                            </execution>
                        </executions>
                    </plugin>
                    <plugin>
                        <artifactId>maven-resources-plugin</artifactId>
                        <version>3.0.2</version>
                        <executions>
                            <execution>
                                <id>copy-configurations</id>
                                <phase>process-test-sources</phase>
                                <goals>
                                    <goal>copy-resources</goal>
                                </goals>
                                <configuration>
                                    <outputDirectory>target/wildfly-10.1.0.Final/standalone/configuration</outputDirectory>
                                    <resources>
                                        <resource>
                                            <directory>src/test/resources</directory>
                                            <includes>
                                                <include>standalone-full.xml</include>
                                                <include>application-roles.properties</include>
                                                <include>application-users.properties</include>
                                            </includes>
                                            <filtering>true</filtering>
                                        </resource>
                                    </resources>
                                </configuration>
                            </execution>
                        </executions>
                    </plugin>
                </plugins>
            </build>
        </profile>
    </profiles>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring.boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.jboss.arquillian</groupId>
                <artifactId>arquillian-bom</artifactId>
                <version>1.1.11.Final</version>
                <scope>import</scope>
                <type>pom</type>
            </dependency>
            <dependency>
                <groupId>org.jboss.shrinkwrap.resolver</groupId>
                <artifactId>shrinkwrap-resolver-bom</artifactId>
                <version>3.0.0-beta-2</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

        </dependencies>
    </dependencyManagement>
    <properties>
        <!-- For spring vault we'll need to use 5.1.2.RELEASE while our parent 
            project (see services/pom.xml) is still using version 5.0.7.RELEASE https://docs.spring.io/spring-vault/docs/current/reference/html/#preface -->
        <spring.version>5.1.3.RELEASE</spring.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>

    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.apache.tomcat.embed</groupId>
                    <artifactId>tomcat-embed-websocket</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>com.fasterxml.jackson.core</groupId>
                    <artifactId>jackson-databind</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>dom4j</groupId>
                    <artifactId>dom4j</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-oxm</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j-api.version}</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${slf4j-log4j.version}</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.vault</groupId>
            <artifactId>spring-vault-core</artifactId>
            <version>2.1.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.vault</groupId>
            <artifactId>spring-vault-dependencies</artifactId>
            <version>2.1.1.RELEASE</version>
            <type>pom</type>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpmime</artifactId>
            <version>${httpmime.version}</version> <!-- was 4.1 -->
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpcore</artifactId>
            <version>${httpcore.version}</version> <!-- was 4.4 -->
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>${httpclient.version}</version> <!-- was 4.1 -->
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-crypto</artifactId>
            <version>1.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.8.1</version>
        </dependency>
        <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>${validation-api.version}</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>${junit.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>${hibernate-validator.version}</version> <!-- was 4.3.1.Final -->
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>${javax.servlet-api.version}</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.nimbusds</groupId>
            <artifactId>nimbus-jose-jwt</artifactId>
            <version>${nimbus-jose-jwt.version}</version>
        </dependency>
        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcprov-jdk15on</artifactId>
            <version>${bcprov-jdk15on.version}</version>
        </dependency>
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>${commons-fileupload.version}</version> <!-- was 1.3.1 -->
        </dependency>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>${guava.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>${log4j.version}</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>apache-log4j-extras</artifactId>
            <version>${log4j-extras.version}</version>
        </dependency>
        <dependency>
            <groupId>org.jboss.logging</groupId>
            <artifactId>jboss-logging</artifactId>
            <version>3.3.2.Final</version>
        </dependency>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>${gson.version}</version>
        </dependency>

        <dependency>
            <groupId>com.ramen.maple</groupId>
            <artifactId>derrick</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.jboss.spec.javax.servlet</groupId>
            <artifactId>jboss-servlet-api_3.0_spec</artifactId>
            <version>${jboss-servlet-api_3.0_spec.version}</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.jboss.arquillian.junit</groupId>
            <artifactId>arquillian-junit-container</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.wildfly.arquillian</groupId>
            <artifactId>wildfly-arquillian-container-managed</artifactId>
            <version>${wildfly-arquillian-container-managed.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.jboss.shrinkwrap.resolver</groupId>
            <artifactId>shrinkwrap-resolver-impl-maven</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>net.sf.json-lib</groupId>
            <artifactId>json-lib</artifactId>
            <version>${json-lib.version}</version>
            <exclusions>
                <exclusion>
                    <groupId>commons-beanutils</groupId>
                    <artifactId>commons-beanutils</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>${json.version}</version>
        </dependency>
        <!-- resteasy - start -->
        <dependency>
            <groupId>org.jboss.resteasy</groupId>
            <artifactId>resteasy-jaxb-provider</artifactId>
            <version>${resteasy-jaxb-provider.version}</version>
            <scope>provided</scope>
            <exclusions>
                <exclusion>
                    <artifactId>servlet-api</artifactId>
                    <groupId>javax.servlet</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.jboss.resteasy</groupId>
            <artifactId>resteasy-jettison-provider</artifactId>
            <version>${resteasy-jettison-provider.version}</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.jboss.resteasy</groupId>
            <artifactId>resteasy-jackson-provider</artifactId>
            <version>${resteasy-jackson-provider.version}</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.jboss.resteasy</groupId>
            <artifactId>resteasy-jaxrs</artifactId>
            <version>${resteasy-jaxrs.version}</version>
            <scope>provided</scope>
            <exclusions>
                <exclusion>
                    <artifactId>commons-logging</artifactId>
                    <groupId>commons-logging</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>commons-codec</artifactId>
                    <groupId>commons-codec</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- resteasy - end -->
    </dependencies>
    <build>
        <finalName>kms</finalName>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>${spring.boot.version}</version>
            </plugin>
            <plugin>
                <groupId>org.jacoco</groupId>
                <artifactId>jacoco-maven-plugin</artifactId>
                <version>0.8.0</version>
                <executions>
                    <execution>
                        <id>default-prepare-agent</id>
                        <goals>
                            <goal>prepare-agent</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>default-report</id>
                        <phase>prepare-package</phase>
                        <goals>
                            <goal>report</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>${maven.war.plugin.version}</version>
                <configuration>
                    <archive>
                        <manifestEntries>
                            <dependencies>com.fasterxml.jackson.core.jackson-databind export,org.slf4j export,org.jboss.remote-naming export</dependencies>
                        </manifestEntries>
                    </archive>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>${maven.assembly.plugin.version}</version>
                <executions>
                    <execution>
                        <id>prepare kms zip for local</id>
                        <configuration>
                            <finalName>local-conf</finalName>
                            <descriptors>
                                <descriptor>src/main/assembly/local-prepare-conf-zip.xml</descriptor>
                            </descriptors>
                            <appendAssemblyId>false</appendAssemblyId>
                        </configuration>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>prepare kms zip</id>
                        <configuration>
                            <finalName>${project.artifactId}-conf</finalName>
                            <descriptors>
                                <descriptor>src/main/assembly/prepare-conf-zip.xml</descriptor>
                            </descriptors>
                            <appendAssemblyId>false</appendAssemblyId>
                        </configuration>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <artifactId>maven-war-plugin</artifactId>
                <version>${maven.war.plugin.version}</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>${maven-surefire-plugin.version}</version>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                    <compilerArgument>-parameters</compilerArgument>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <distributionManagement>
        <repository>
            <id>deployment</id>
            <name>maple</name>
            <url>http://nexus.ramen.com/repository/releases</url>
        </repository>
        <snapshotRepository>
            <id>deployment</id>
            <name>maple</name>
            <url>http://nexus.ramen.com/repository/snapshots</url>
        </snapshotRepository>
    </distributionManagement>
</project>
EN

回答 2

Stack Overflow用户

回答已采纳

发布于 2019-03-14 07:48:35

SpringBoot2.1.2 requires需要SpringFramework5.1.4.requires与文档相同

SpringBoot2.1.2. requires需要Java 8,并且与Java 11兼容(包括在内)。SpringFramework5.1.4. required或更高版本也是必需的。

您应该将spring-core和其他框架依赖项升级到5.1.4.RELEASE。更好的是,为了避免这种问题,您应该让Spring管理Spring依赖项的版本,例如通过BOM。

票数 6
EN

Stack Overflow用户

发布于 2019-03-14 07:54:10

您必须在类上指定@PropertySource注释。

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@Service
@Transactional
@PropertySource("classpath:application.properties")
public class VaultLMSImpl implements LMSService {
    protected final Log logger = LogFactory.getLog(VaultLMSImpl.class);

    @Value("${lms.token}")
    private String token;

    @Autowired
    private Endpoint endpoint;
}
票数 1
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接:

https://stackoverflow.com/questions/55166702

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等值线是气象上比较常用的一种图形,特别是分析天气形势时,常用的地面气压、位势高度、气温等以等值线展示效果最好;在某些时候,我们还需要对等值线填色图进行进一步的美化。兹分别介绍之。
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使用Python制作3个简易地图
在处理地理空间数据时,经常需要以最自然的方式可视化这些数据:地图。如果可以使用Python快速轻松地创建数据的交互式地图,在本教程中使用洛杉矶县所有星巴克位置的数据集。在文章的最后将能够创建:
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图像处理常用插值方法总结
在做数字图像处理时,经常会碰到小数象素坐标的取值问题,这时就需要依据邻近象素的值来对该坐标进行插值。比如:做地图投影转换,对目标图像的一个象素进行坐标变换到源图像上对应的点时,变换出来的对应的坐标是一个小数,再比如做图像的几何校正,也会碰到同样的问题。以下是对常用的三种数字图像插值方法进行介绍。 1、最邻近元法   这是最简单的一种插值方法,不需要计算,在待求象素的四邻象素中,将距离待求象素最近的邻象素灰度赋给待求象素。设i+u, j+v(i, j为正整数, u, v为大于零小于1的小数,下同)为待求象素坐
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Python气象绘图教程特刊(二)等值线
在气象研究领域,限制于世界的地貌和人文地理,大部分的气象原始资料是站点分布的。气象站的分布的特点是北多南少(有闲钱建设气象站的国家基本在北半球,陆地基本集中于北半球,世界人口集中于北半球),陆多海少(陆地易于永久和半永久观测站建设,海上的漂浮测站和轮船的观测不稳定)。中国的气象站密度基本与人口密度的漠河-腾冲县线吻合,表现在东多西少,中间多南北少(河北县级气象局的密度比长江以南任何一个省都高,中原地区又高于其他地区,这些牵扯到历史自然地理和人文地理)。
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C程序中的raise和kill两个函数有何不同?
在多线程程序中,进程给自己发SIGTERM信号退出,应当调用“kill(getpid(), SIGTERM)”,而不是“raise(SIGTERM)”。
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R可视乎|等高线图
等高线图(contour map) 是可视化二维空间标量场的基本方法[1],可以将三维数据使用二维的方法可视化,同时用颜色视觉特征表示第三维数据,如地图上的等高线、天气预报中的等压线和等温线等。假设
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numpy简单应用---等值线(多边形)平滑
风向条件下的气体扩散模型计算得到的数据,相当于等值线需要在地图上展示。如下图,可以看到,离中心最近的多边形毛糙锯齿严重。
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numpy简单应用---等值线(多边形)平滑
Shader初学笔记:一种三维等值线的算法
把反距离加权算法转换到三维空间,是不是很方便的算出三维空间下的等值线了呢,再结合Shatter Toolkit插件进行剖切,修改修改代码。应该可以解决地层模型任意剖切后,切面的等值线渲染问题了。先写个思路,代码有空再补上。(发现发表文章还不能少于140字!先写个三维的反距离加权算法。)
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LeetCode,给定一个链表,判断链表中是否有环
如果链表中有某个节点,可以通过连续跟踪 next 指针再次到达,则链表中存在环。为了表示给定链表中的环,我们使用整数 pos 来表示链表尾连接到链表中的位置(索引从 0 开始)。如果 pos 是 -1,则在该链表中没有环。注意:pos 不作为参数进行传递,仅仅是为了标识链表的实际情况。
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LeetCode,给定一个链表,判断链表中是否有环
2021-10-08:填充每个节点的下一个右侧节点指针。给定一个
2021-10-08:填充每个节点的下一个右侧节点指针。给定一个 完美二叉树 ,其所有叶子节点都在同一层,每个父节点都有两个子节点。填充它的每个 next 指针,让这个指针指向其下一个右侧节点。如果找不到下一个右侧节点,则将 next 指针设置为 NULL。初始状态下,所有 next 指针都被设置为 NULL。进阶:你只能使用常量级额外空间。使用递归解题也符合要求,本题中递归程序占用的栈空间不算做额外的空间复杂度。力扣116。
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[android] 在不同的activity之间传递数据
添加<TextView/>控件,设置控件内容水平居中,android:gravity=”center_horizontal”
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2021-11-06:3的幂。给定一个整数,写一个函数来判断它是否是 3 的幂次方。如果是,返回 true ;否则,返回 false 。整数 n 是 3 的幂次方需满足:存在整数 x 使得 n == 3**x。力扣326。
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绘图系列(1):利用matplotlib绘制等值线图
绘图系列是为了给出一些图形绘制示例,便于快速绘制一些图形。此系列不受所用语言和工具的限制,可能会使用 python,matlab,ncl,idl以及其它一些语言或是工具。
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绘图系列(1):利用matplotlib绘制等值线图
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