所有内容都加载到maven存储库中。在我的情况下,它位于C:\opt\m2\repository。我在eclipse中将M2_REPO变量设置为指向C:\opt\m2\repository,并在命令行中设置了mvn clean install。
然后,我等待了10分钟,等待下载所有依赖项,然后去检查repo。所有的东西都被下载到那里。
然后我mvn eclipse:eclipse并将项目导入eclipse。
似乎所有东西都是导入的,除了所有的maven依赖项。我的项目有9409个错误,因为它缺少那些jar文件。
我没有帮到Project -> Clean。
我在项目名称上做了F5,没有帮助。
我删除并重新导入了,没有帮助。
仅供参考,我也尝试过m2e插件,但没有帮助。
我错过什么了吗?
以下是.classpath文件的内容:
<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" output="ks-common-util/target/classes" path="ks-common-util/src/main/java"/>
<classpathentry kind="src" output="ks-common-util/target/classes" path="ks-common-util/src/main/resources"/>
<classpathentry kind="src" output="ks-common-util/target/test-classes" path="ks-common-util/src/test/java"/>
<classpathentry kind="src" output="ks-common-util/target/test-classes" path="ks-common-util/src/test/resources"/>
<classpathentry kind="src" output="ks-common-test/target/classes" path="ks-common-test/src/main/java"/>
<classpathentry kind="src" output="ks-common-test/target/classes" path="ks-common-test/src/main/resources"/>
<classpathentry kind="src" output="ks-common-test/target/test-classes" path="ks-common-test/src/test/java"/>
<classpathentry kind="src" output="ks-common-test/target/test-classes" path="ks-common-test/src/test/resources"/>
<classpathentry kind="src" output="ks-common-api/target/classes" path="ks-common-api/src/main/java"/>
<classpathentry kind="src" output="ks-common-api/target/classes" path="ks-common-api/src/main/resources"/>
<classpathentry kind="src" output="ks-common-impl/target/classes" path="ks-common-impl/src/main/java"/>
<classpathentry kind="src" output="ks-common-impl/target/classes" path="ks-common-impl/src/main/resources"/>
<classpathentry kind="src" output="ks-common-impl/target/test-classes" path="ks-common-impl/src/test/java"/>
<classpathentry kind="src" output="ks-common-impl/target/test-classes" path="ks-common-impl/src/test/resources"/>
<classpathentry kind="src" output="ks-common-ui/target/classes" path="ks-common-ui/src/main/java"/>
<classpathentry kind="src" output="ks-common-ui/target/classes" path="ks-common-ui/src/main/resources"/>
<classpathentry kind="src" output="ks-common-ui/target/test-classes" path="ks-common-ui/src/test/java"/>
<classpathentry kind="src" output="ks-common-ui/target/test-classes" path="ks-common-ui/src/test/resources"/>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.6"/>
<classpathentry exported="true" kind="con" path="org.maven.ide.eclipse.MAVEN2_CLASSPATH_CONTAINER"/>
<classpathentry kind="output" path="target/classes"/>
该项目被构建为父子项目。一个父项目和8个子项目。每个文件都有一个pom.xml文件。
父项目很好,我可以编译它。但是,子项目都不起作用,因为没有任何依赖项加载到项目中。
这是父pom.xml的依赖项
<dependencyManagement>
<dependencies>
<!-- Test Framework Dependencies -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derby</artifactId>
<version>${derby.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derbynet</artifactId>
<version>${derby.version}</version>
</dependency>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derbyclient</artifactId>
<version>${derby.version}</version>
</dependency>
<dependency>
<groupId>org.mortbay.jetty</groupId>
<artifactId>jetty</artifactId>
<version>${jetty.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<artifactId>servlet-api</artifactId>
<groupId>javax.servlet</groupId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>persistence-api</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>javax.transaction</groupId>
<artifactId>jta</artifactId>
<version>1.1</version>
</dependency>
<dependency>
<groupId>cglib</groupId>
<artifactId>cglib-nodep</artifactId>
<version>2.1_3</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
<version>${eclipselink.version}</version>
</dependency>
<dependency>
<groupId>org.apache.openjpa</groupId>
<artifactId>openjpa</artifactId>
<version>1.2.1</version>
</dependency>
<!-- Hibernate -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-annotations</artifactId>
<version>3.4.0.GA</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>3.4.0.GA</version>
</dependency>
<!-- Hibernate Transitive Dependencies -->
<dependency>
<groupId>dom4j</groupId>
<artifactId>dom4j</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>commons-collections</groupId>
<artifactId>commons-collections</artifactId>
<version>3.2</version>
</dependency>
<dependency>
<groupId>antlr</groupId>
<artifactId>antlr</artifactId>
<version>2.7.7</version>
</dependency>
<!-- Spring Dependencies -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
<scope>test</scope>
</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.security</groupId>
<artifactId>spring-security-core</artifactId>
<version>${spring.security.version}</version>
<exclusions>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring-support</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-security-core</artifactId>
<version>${spring.security.version}</version>
<exclusions>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring-support</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-security-cas-client</artifactId>
<version>${spring.security.version}</version>
</dependency>
<!-- This jar is only needed if you are using CAS with Spring Security -->
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-cas-client</artifactId>
<version>${spring.security.version}</version>
<exclusions>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring-dao</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.opensaml</groupId>
<artifactId>opensaml</artifactId>
<version>1.1</version>
<!-- <version>2.2.2</version> -->
</dependency>
<dependency>
<groupId>xerces</groupId>
<artifactId>xercesImpl</artifactId>
<version>${xercesImpl.version}</version>
</dependency>
<!-- Metro Dependencies -->
<dependency>
<groupId>com.sun.xml.ws</groupId>
<artifactId>webservices-rt</artifactId>
<version>${metro.version}</version>
</dependency>
<dependency>
<groupId>org.jvnet.jax-ws-commons.spring</groupId>
<artifactId>jaxws-spring</artifactId>
<version>1.8</version>
<exclusions>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring</artifactId>
</exclusion>
<!-- These must be excluded for WSIT to work -->
<exclusion>
<groupId>com.sun.xml.ws</groupId>
<artifactId>jaxws-rt</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-impl</artifactId>
</exclusion>
<exclusion>
<groupId>javax.activation</groupId>
<artifactId>activation</artifactId>
</exclusion>
<exclusion>
<groupId>javax.xml.soap</groupId>
<artifactId>saaj-api</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.xml.messaging.saaj</groupId>
<artifactId>saaj-impl</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.xml.stream.buffer</groupId>
<artifactId>streambuffer</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.xml.stream</groupId>
<artifactId>sjsxp</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.org.apache.xml.internal</groupId>
<artifactId>resolver</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- stax-ex 1.0 pom making a disaster so trying 1.2 -->
<dependency>
<groupId>org.jvnet.staxex</groupId>
<artifactId>stax-ex</artifactId>
<version>1.2</version>
</dependency>
<!-- CXF Dependencies -->
<!-- Libraries not required for Java 1.6_04+ are being excluding (based cxf WHICH_JARS file) -->
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-api</artifactId>
<version>${cxf.version}</version>
<exclusions>
<exclusion>
<groupId>org.apache.geronimo.specs</groupId>
<artifactId>geronimo-javamail_1.4_spec</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.geronimo.specs</groupId>
<artifactId>geronimo-activation_1.1_spec</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-core</artifactId>
<version>${cxf.version}</version>
<exclusions>
<exclusion>
<groupId>org.apache.geronimo.specs</groupId>
<artifactId>geronimo-javamail_1.4_spec</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-frontend-jaxws</artifactId>
<version>${cxf.version}</version>
<exclusions>
<exclusion>
<groupId>org.apache.geronimo.specs</groupId>
<artifactId>geronimo-javamail_1.4_spec</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.geronimo.specs</groupId>
<artifactId>geronimo-jaxws_2.1_spec</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.geronimo.specs</groupId>
<artifactId>geronimo-activation_1.1_spec</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.geronimo.specs</groupId>
<artifactId>geronimo-annotation_1.0_spec</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.geronimo.specs</groupId>
<artifactId>geronimo-ws-metadata_2.0_spec</artifactId>
</exclusion>
<exclusion>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
</exclusion>
<exclusion>
<groupId>javax.xml.soap</groupId>
<artifactId>saaj-api</artifactId>
</exclusion>
<exclusion>
<groupId>com.sun.xml.messaging.saaj</groupId>
<artifactId>saaj-impl</artifactId>
</exclusion>
<exclusion>
<groupId>org.codehaus.woodstox</groupId>
<artifactId>wstx-asl</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-frontend-simple</artifactId>
<version>${cxf.version}</version>
<exclusions>
<exclusion>
<groupId>org.apache.geronimo.specs</groupId>
<artifactId>geronimo-jaxws_2.1_spec</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-common-utilities</artifactId>
<version>${cxf.version}</version>
<exclusions>
<exclusion>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-tools-common</artifactId>
<version>${cxf.version}</version>
<exclusions>
<exclusion>
<groupId>org.apache.geronimo.specs</groupId>
<artifactId>geronimo-ws-metadata_2.0_spec</artifactId>
</exclusion>
<exclusion>
<groupId>javax.xml.soap</groupId>
<artifactId>saaj-api</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.velocity</groupId>
<artifactId>velocity</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-transports-http</artifactId>
<version>${cxf.version}</version>
</dependency>
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-transports-http-jetty</artifactId>
<version>${cxf.version}</version>
</dependency>
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-ws-security</artifactId>
<version>${cxf.version}</version>
<exclusions>
<exclusion>
<groupId>org.apache.geronimo.specs</groupId>
<artifactId>geronimo-annotation_1.0_spec</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.geronimo.specs</groupId>
<artifactId>geronimo-stax-api_1.0_spec</artifactId>
</exclusion>
<exclusion>
<groupId>javax.xml.soap</groupId>
<artifactId>saaj-api</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-bindings-soap</artifactId>
<version>${cxf.version}</version>
<exclusions>
<exclusion>
<groupId>org.apache.geronimo.specs</groupId>
<artifactId>geronimo-javamail_1.4_spec</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.geronimo.specs</groupId>
<artifactId>geronimo-activation_1.1_spec</artifactId>
</exclusion>
<exclusion>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
</exclusion>
<!-- GWT hosted not working if this is excluded -->
<!--
<exclusion>
<groupId>org.codehaus.woodstox</groupId>
<artifactId>wstx-asl</artifactId>
</exclusion>
-->
</exclusions>
</dependency>
// deleted to fit in SO POST
<!-- Logging -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.6.0</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.6.0</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.1.1</version>
</dependency>
<!-- Velocity (used by cxf & statements) -->
<dependency>
<groupId>velocity</groupId>
<artifactId>velocity</artifactId>
<version>${velocity.version}</version>
</dependency>
<dependency>
<groupId>org.apache.velocity</groupId>
<artifactId>velocity</artifactId>
<version>${velocity.version}</version>
</dependency>
<dependency>
<groupId>org.apache.velocity</groupId>
<artifactId>velocity-tools</artifactId>
<version>${velocity.tools.version}</version>
</dependency>
<dependency>
<groupId>commons-lang</groupId>
<artifactId>commons-lang</artifactId>
<version>2.3</version>
</dependency>
<!-- Pom dependencies for impl specific jars -->
<dependency>
<groupId>org.kuali.student.common</groupId>
<artifactId>ks-jta</artifactId>
<version>${project.version}</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.kuali.student.common</groupId>
<artifactId>ks-cxf</artifactId>
<version>${project.version}</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.kuali.student.common</groupId>
<artifactId>ks-metro</artifactId>
<version>${project.version}</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.kuali.student.common</groupId>
<artifactId>ks-eclipselink</artifactId>
<version>${project.version}</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.kuali.student.common</groupId>
<artifactId>ks-hibernate</artifactId>
<version>${project.version}</version>
<type>pom</type>
</dependency>
<!-- GWT Dependencies -->
// deleted in order to fit in SO post
<dependency>
<groupId>org.kuali.rice</groupId>
<artifactId>rice-impl</artifactId>
<version>${kuali.rice.version}</version>
<exclusions>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring-dao</artifactId>
</exclusion>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring-jpa</artifactId>
</exclusion>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring-remoting</artifactId>
</exclusion>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring-support</artifactId>
</exclusion>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring-jmx</artifactId>
</exclusion>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring-mock</artifactId>
</exclusion>
<exclusion>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</exclusion>
<exclusion>
<groupId>htmlunit</groupId>
<artifactId>htmlunit</artifactId>
</exclusion>
<exclusion>
<groupId>org.mortbay.jetty</groupId>
<artifactId>jetty</artifactId>
</exclusion>
<!--
<exclusion>
<groupId>org.springmodules</groupId>
<artifactId>spring-modules-ojb</artifactId>
</exclusion>
-->
<!--
<exclusion>
<groupId>ojb</groupId>
<artifactId>db-ojb</artifactId>
</exclusion>
-->
<exclusion>
<groupId>com.oracle</groupId>
<artifactId>ojdbc14</artifactId>
</exclusion>
<exclusion>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.geronimo.specs</groupId>
<artifactId>geronimo-activation_1.1_spec</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.geronimo.specs</groupId>
<artifactId>geronimo-javamail_1.4_spec</artifactId>
</exclusion>
<!--
These dependencies conflict with gwt-dev for running hosted mode via eclipse
launch file.
-->
<exclusion>
<groupId>tomcat</groupId>
<artifactId>jasper-compiler-jdt</artifactId>
</exclusion>
<exclusion>
<groupId>tomcat</groupId>
<artifactId>jasper-compiler</artifactId>
</exclusion>
<exclusion>
<groupId>tomcat</groupId>
<artifactId>jasper-runtime</artifactId>
</exclusion>
<exclusion>
<groupId>org.eclipse.jdt</groupId>
<artifactId>core</artifactId>
</exclusion>
<!-- JOTM - uncomment out to switch to Bitronix -->
<!--
<exclusion>
<groupId>xapool</groupId>
<artifactId>xapool</artifactId>
</exclusion>
<exclusion>
<groupId>jotm</groupId>
<artifactId>jotm</artifactId>
</exclusion>
-->
<!-- itext -->
<exclusion>
<groupId>itext</groupId>
<artifactId>itext</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
<version>1.7.0</version>
</dependency>
// deleted some because SO only allow 30000 characters
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</dependency>
这是孩子们的pom.xml之一
<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>
<parent>
<groupId>org.kuali.student</groupId>
<artifactId>student</artifactId>
<version>1.2</version>
</parent>
<groupId>org.kuali.student.common</groupId>
<artifactId>ks-common</artifactId>
<packaging>pom</packaging>
<name>KS Common</name>
<description>Kuali Student Common</description>
<issueManagement>
<system>Jira</system>
<url>https://test.kuali.org/jira/browse/KSCOR</url>
</issueManagement>
<profiles>
<profile>
<id>default</id>
<activation>
<activeByDefault>true</activeByDefault>
</activation>
<modules>
<module>ks-cxf</module>
<module>ks-metro</module>
<module>ks-eclipselink</module>
<module>ks-hibernate</module>
<module>ks-jta</module>
<module>ks-rice-lessdep</module>
<module>ks-common-util</module>
<module>ks-common-test</module>
<module>ks-common-api</module>
<module>ks-common-impl</module>
<module>ks-common-ui</module>
</modules>
</profile>
<profile>
<id>skip-ui</id>
<modules>
<module>ks-cxf</module>
<module>ks-metro</module>
<module>ks-eclipselink</module>
<module>ks-hibernate</module>
<module>ks-jta</module>
<module>ks-rice-lessdep</module>
<module>ks-common-util</module>
<module>ks-common-test</module>
<module>ks-common-api</module>
<module>ks-common-impl</module>
</modules>
</profile>
</profiles>
<repositories>
<repository>
<id>kuali.nexus</id>
<name>Nexus Repository Manager</name>
<url>http://nexus.kuali.org/content/groups/public</url>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
</repositories>
</project>发布于 2013-03-20 02:58:38
有了m2e插件,你就不需要做任何手动的工作了。从您的工作区中删除该项目,然后转到File->Import->Maven->Existing Maven Projects。浏览对话框以导入您的项目,您就完成了。


请注意,如果在您的Maven项目或其任何子模块中有任何.classpath、.settings或.project资源,您将需要在执行导入之前删除它们(mvn eclipse:clean不足以删除它们)。这是因为它们造成了与m2e设置的冲突。
发布于 2013-03-20 01:06:38
请按此顺序进行尝试:
mvn eclipse:eclipse -Dwtpversion=2.0
mvn package
mvn eclipse:clean发布于 2013-03-20 01:37:08
这样试试:
中的项目创建了maven项目
它应该是这样工作的
https://stackoverflow.com/questions/15505940
复制相似问题