继续学习Maven。
4.2 变量
1) 问:怎样使用变量替换?项目中的某个配置文件比方jdbc.properties使用了一些pom中的变量,怎样在公布中使用包括真实内容的终于结果文件?
答:使用资源过滤功能,比方:
...
<properties>
<jdbc.driverClassName>com.mysql.jdbc.Driver</jdbc.driverClassName>
<jdbc.url>jdbc:mysql://localhost:3306/development_db</jdbc.url>
<jdbc.username>dev_user</jdbc.username>
<jdbc.password>s3cr3tw0rd</jdbc.password>
</properties>
...
<build>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
</build>
...
<profiles>
<profile>
<id>production</id>
<properties>
<jdbc.driverClassName>oracle.jdbc.driver.OracleDriver</jdbc.driverClassName>
<jdbc.url>jdbc:oracle:thin:@proddb01:1521:PROD</jdbc.url>
<jdbc.username>prod_user</jdbc.username>
<jdbc.password>s00p3rs3cr3t</jdbc.password>
</properties>
</profile>
</profiles>
</project>
2) 问: maven-svn-revision-number-plugin 插件说明
答: maven-svn-revision-number-plugin 能够从 SVN 中获取版本,并将其变成环境变量,交由其它插件或者profile使用,具体帮助在这里 。一般和resource的filter机制同一时候使用
<plugin>
<groupId>com.google.code.maven-svn-revision-number-plugin</groupId>
<artifactId>maven-svn-revision-number-plugin</artifactId>
<version>1.3</version>
<executions>
<execution>
<goals>
<goal>revision</goal>
</goals>
</execution>
</executions>
<configuration>
<entries>
<entry>
<prefix>prefix</prefix>
</entry>
</entries>
</configuration>
</plugin>
</plugins>
这段代码负责把resource文件里的内容替换成适当内容
path = ${prefix.path}
revision = ${prefix.revision}
mixedRevisions = ${prefix.mixedRevisions}
committedRevision = ${prefix.committedRevision}
status = ${prefix.status}
specialStatus = ${prefix.specialStatus}
3)我的程序有些单元測试有错误。怎样忽略測试步骤?
有好几种方法都能够实现跳过单元測试步骤。一种是给mvn添加命令行參数 -Dmaven.test.skip=true 或者 -DskipTests=true 。第二种是给surefire插件添加參数。例如以下:
<span class="kwrd"><</span><span class="html">project</span><span class="kwrd">></span> [...] <span class="kwrd"><</span><span class="html">build</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">plugins</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">plugin</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">groupId</span><span class="kwrd">></span>org.apache.maven.plugins<span class="kwrd"></</span><span class="html">groupId</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">artifactId</span><span class="kwrd">></span>maven-surefire-plugin<span class="kwrd"></</span><span class="html">artifactId</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">version</span><span class="kwrd">></span>2.8<span class="kwrd"></</span><span class="html">version</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">configuration</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">skipTests</span><span class="kwrd">></span>true<span class="kwrd"></</span><span class="html">skipTests</span><span class="kwrd">></span> <span class="kwrd"></</span><span class="html">configuration</span><span class="kwrd">></span> <span class="kwrd"></</span><span class="html">plugin</span><span class="kwrd">></span> <span class="kwrd"></</span><span class="html">plugins</span><span class="kwrd">></span> <span class="kwrd"></</span><span class="html">build</span><span class="kwrd">></span> [...] <span class="kwrd"></</span><span class="html">project</span><span class="kwrd">></span>
4) 假设仅仅想执行单个測试用例,是否能实现?
能够,执行时候添加命令行參数 -Dtest=MyTest 就可以,当中MyTest是所须要执行的单元測试用例名称,可是不须要包括package部分。
4.3 编译
1) 问:怎样给插件指派參数?比方我要设置一些编译參数
答:下面内容设定编译器编译java1.5的代码
...
<build>
...
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.5</source>
<target>1.5</target>
</configuration>
</plugin>
</plugins>
...
</build>
...
</project>
2) 问:我的文件夹是非标准的文件夹结构。怎样设置让maven支持?
答:指定source文件夹和test-source文件夹就可以。
<directory>target</directory>
<sourceDirectory>src</sourceDirectory>
<scriptSourceDirectory>js/scripts</scriptSourceDirectory>
<testSourceDirectory>test</testSourceDirectory>
<outputDirectory>bin</outputDirectory>
<testOutputDirectory>bin</testOutputDirectory>
</build>
这里要注意,directory假设也设置成bin文件夹的话,maven打包的时候会引起死循环,由于directory是全部工作存放的地方。默认包括outputDirectory定义的文件夹在内。
3) 我源码是UTF8格式的,我怎样在maven中指定?
设置一个变量就可以
...
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
...
</project>
{code:xml} <build> ... <plugin> <artifactId>maven-compiler-plugin</artifactId> <configuration> <encoding>UTF-8</encoding> </configuration> </plugin> ... </build> {code}
. 问:我的项目除了main/java文件夹之外。还加了其它的c++文件夹,想要一并编译,怎样做?
答:使用native插件,详细配置方法參考[http://mojo.codehaus.org/maven-native/native-maven-plugin/]{code:xml} <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>native-maven-plugin</artifactId> <extensions>true</extensions> <configuration> </plugin> {code}
. 问:我想要把project的全部依赖的jar都一起打包,怎么办?
答:首先改动maven的配置文件,给maven-assembly-plugin添加一个jar-with-dependencies的描写叙述。{code:xml} <project> [...] <build> <plugins> <plugin> <artifactId>maven-assembly-plugin</artifactId> <configuration> <descriptorRefs> <descriptorRef>jar-with-dependencies</descriptorRef> </descriptorRefs> </configuration> </plugin> </plugins> </build> [...] </project> {code}
mvn assembly:assembly
. 问:我想把main/scripts中的内容一起打包公布,怎样做?
答:在pom中配置额外的资源文件夹。假设须要的话。还能够指定资源文件夹的输出位置{code:xml} <build> ... <resources> <resource> <filtering>true</filtering> <directory>src/main/command</directory> <includes> <include>run.bat</include> <include>run.sh</include> </includes> <targetPath>/abc</targetPath> </resource> <resource> <directory>src/main/scripts</directory> </resource> </resources> ... </build> {code}
. 问:我有多个源码文件夹,可是maven仅仅支持一个main src和一个test src,怎么办?
答:使用另外一个插件,并仿照例如以下配置pom{code:xml} <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>build-helper-maven-plugin</artifactId> <version>1.1</version> <executions> <execution> <id>add-source</id> <phase>generate-sources</phase> <goals> <goal>add-source</goal> </goals> <configuration> <sources> <source>src/config/java</source> <source>src/main/java</source> <source>src/member/java</source> </sources> </configuration> </execution> </executions> </plugin> {code}
. 问:我的源码文件夹中有一部分文件我不想让maven编译,怎么做?
答:使用一个maven插件,然后使用includes和excludes。同理。也能够处理资源的过滤。
{code:xml} <build> <sourceDirectory>http://www.cnblogs.com/src/java</sourceDirectory> <plugins> <plugin> <groupId>com.sun.enterprise</groupId> <artifactId>hk2-maven-plugin</artifactId> <configuration> <includes> <include>com/sun/logging/LogDomains.*</include> <include>com/sun/enterprise/util/OS.java</include> <include>com/sun/enterprise/util/io/FileUtils.java</include> <include>com/sun/enterprise/util/zip/**</include> <include>com/sun/enterprise/util/i18n/**</include> <include>com/sun/enterprise/deployment/backend/IASDeploymentException.java</include> </includes> <excludes> <exclude>com/sun/enterprise/config/ConfigBeansFactory.java</exclude> <exclude>com/sun/enterprise/config/clientbeans/**</exclude> </excludes> </configuration> </plugin> </plugins> <resources> <resource> <directory>http://www.cnblogs.com/src/java</directory> <includes> <include>**/*.properties</include> </includes> </resource> </resources> </build> {code}
. 问:我的项目是一个纯的html组成的项目,没有不论什么的java代码,怎么跳过编译过程?
答:配置例如以下{code:xml} <build> <sourceDirectory>src/java</sourceDirectory> <plugins> <plugin> <groupId>com.sun.enterprise</groupId> <artifactId>hk2-maven-plugin</artifactId> </plugin> </plugins> </build> {code}
. 问:我的project里用hibernate,想在编译时候自己主动生成ddl,怎样做?
答:加入插件hibernate3-maven-plugin。依照例如以下配置:
{code:xml} <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>hibernate3-maven-plugin</artifactId> <version>2.1</version> <configuration> <components> <component> <name>hbm2ddl</name> <implementation>annotationconfiguration</implementation> </component> </components> </configuration> <dependencies> <dependency> <groupId>hsqldb</groupId> <artifactId>hsqldb</artifactId> <version>${hsqldb.version}</version> </dependency> </dependencies> </plugin> {code}
. 问:我能用maven支持eclipse RCP项目吗?
答:当然能够,你能够使用插件 Tycho,具体内容能够參考这里[http://mattiasholmqvist.se/2010/02/building-with-tycho-part-1-osgi-bundles/].
<plugin> <groupid>org.sonatype.tycho</groupid> <artifactid>target-platform-configuration</artifactid> <version>0.7.0</version> <configuration> <resolver>p2</resolver> </configuration> </plugin> 另外。老牌的pde-maven-plugin就不要用了,已经好几年没见更新了。
4.4 ant互动
1) 怎样在maven编译时候执行ant脚本?
使用专门的antrun插件,而且在target标签内部增加ant的代码
<span class="kwrd"><</span><span class="html">plugin</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">artifactId</span><span class="kwrd">></span>maven-antrun-plugin<span class="kwrd"></</span><span class="html">artifactId</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">version</span><span class="kwrd">></span>1.6<span class="kwrd"></</span><span class="html">version</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">executions</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">execution</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">phase</span><span class="kwrd">></span> <span class="rem"><!-- 生命周期阶段 --></span> <span class="kwrd"></</span><span class="html">phase</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">configuration</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">target</span><span class="kwrd">></span> <span class="rem"><!-- 增加target内部的代码 --></span> <span class="kwrd"></</span><span class="html">target</span><span class="kwrd">></span> <span class="kwrd"></</span><span class="html">configuration</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">goals</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">goal</span><span class="kwrd">></span>run<span class="kwrd"></</span><span class="html">goal</span><span class="kwrd">></span> <span class="kwrd"></</span><span class="html">goals</span><span class="kwrd">></span> <span class="kwrd"></</span><span class="html">execution</span><span class="kwrd">></span> <span class="kwrd"></</span><span class="html">executions</span><span class="kwrd">></span> <span class="kwrd"></</span><span class="html">plugin</span><span class="kwrd">></span>
2)怎样在ant脚本中引用maven的classpath?
maven给每个依赖都生成了一个属性,格式为"groupId:artifactId[:classifier]:type",比方,假设一下样例就显示依赖的org.apache.common-util的jar文件路径
<span class="kwrd"><</span><span class="html">echo</span> <span class="attr">message</span><span class="kwrd">="Dependency JAR Path: ${org.apache:common-util:jar}"</span><span class="kwrd">/></span>
另外,maven还提前定义了四个classpath的引用。他们是
- maven.compile.classpath
- maven.runtime.classpath
- maven.test.classpath
- maven.plugin.classpath
3)怎样使用antrun插件执行外部的build文件?
非常easy,直接在antrun里边使用ant指令就可以。例如以下:
<span class="kwrd"><</span><span class="html">plugin</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">groupId</span><span class="kwrd">></span>org.apache.maven.plugins<span class="kwrd"></</span><span class="html">groupId</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">artifactId</span><span class="kwrd">></span>maven-antrun-plugin<span class="kwrd"></</span><span class="html">artifactId</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">version</span><span class="kwrd">></span>1.6<span class="kwrd"></</span><span class="html">version</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">executions</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">execution</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">id</span><span class="kwrd">></span>compile<span class="kwrd"></</span><span class="html">id</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">phase</span><span class="kwrd">></span>compile<span class="kwrd"></</span><span class="html">phase</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">configuration</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">target</span><span class="kwrd">></span> <span class="rem"><!-- 同一时候传递内置的classpath给外部ant文件 --></span> <span class="kwrd"><</span><span class="html">property</span> <span class="attr">name</span><span class="kwrd">="compile_classpath"</span> <span class="attr">refid</span><span class="kwrd">="maven.compile.classpath"</span><span class="kwrd">/></span> <span class="kwrd"><</span><span class="html">property</span> <span class="attr">name</span><span class="kwrd">="runtime_classpath"</span> <span class="attr">refid</span><span class="kwrd">="maven.runtime.classpath"</span><span class="kwrd">/></span> <span class="kwrd"><</span><span class="html">property</span> <span class="attr">name</span><span class="kwrd">="test_classpath"</span> <span class="attr">refid</span><span class="kwrd">="maven.test.classpath"</span><span class="kwrd">/></span> <span class="kwrd"><</span><span class="html">property</span> <span class="attr">name</span><span class="kwrd">="plugin_classpath"</span> <span class="attr">refid</span><span class="kwrd">="maven.plugin.classpath"</span><span class="kwrd">/></span> <span class="kwrd"><</span><span class="html">ant</span> <span class="attr">antfile</span><span class="kwrd">="${basedir}/build.xml"</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">target</span> <span class="attr">name</span><span class="kwrd">="test"</span><span class="kwrd">/></span> <span class="kwrd"></</span><span class="html">ant</span><span class="kwrd">></span> <span class="kwrd"></</span><span class="html">target</span><span class="kwrd">></span> <span class="kwrd"></</span><span class="html">configuration</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">goals</span><span class="kwrd">></span> <span class="kwrd"><</span><span class="html">goal</span><span class="kwrd">></span>run<span class="kwrd"></</span><span class="html">goal</span><span class="kwrd">></span> <span class="kwrd"></</span><span class="html">goals</span><span class="kwrd">></span> <span class="kwrd"></</span><span class="html">execution</span><span class="kwrd">></span> <span class="kwrd"></</span><span class="html">executions</span><span class="kwrd">></span> <span class="kwrd"></</span><span class="html">plugin</span><span class="kwrd">></span>
. 问:怎样在ant中使用maven的功能?
答:使用ant的[maven task|http://maven.apache.org/ant-tasks/index.html]。只是仅仅有ant 1.6以上和jdk 1.5环境才支持。h4. 測试相关
. 问:怎样忽略某个阶段的结果?比方单元測试不一定要全正确
答:给插件添加testFailureIgnore參数。并设置为false。假设要屏蔽该阶段,则用
<skip>true</skip>
{code:xml} <project> [...] <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-surefire-plugin</artifactId> <configuration> <testFailureIgnore>true</testFailureIgnore> </configuration> </plugin> </plugins> </build> [...] </project> {code}
. 问:我怎样在maven中增加PMD,CheckStyle,JDepend等检查功能?
答:增加PMD检查。下面代码假设在reporting节点中增加则在
mvn site中运行。假设在
build节点中增加。则在build的时候自己主动执行检查。具体配置參考[pmd插件使用说明|http://maven.apache.org/plugins/maven-pmd-plugin/]
{code:xml} <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-pmd-plugin</artifactId> <version>2.5</version> </plugin> </plugins> {code}增加 checkstyle 检查。具体配置參考[checkstyle插件使用说明|http://maven.apache.org/plugins/maven-checkstyle-plugin/],相同注意放置在reporting和build节点中的差别(全部报表类插件都要相同注意):
{code:xml} <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-checkstyle-plugin</artifactId> <version>2.5</version> </plugin> {code}增加 simian 的支持。simian是一个支持代码相似度检查的工具,眼下有maven插件,也有checkstyle的插件。
它不仅能够检查java,甚至能够支持文本文件的检查。
具体帮助信息參考[这里|http://www.redhillconsulting.com.au/products/simian/]。simian 的 maven插件在[这里|http://mojo.codehaus.org/simian-report-maven-plugin/introduction.html]
{code:xml} <build> <plugins> <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>simian-maven-plugin</artifactId> <version>1.6.1</version> </plugin> </plugins> ... </build> {code}增加 jdepend 检查,具体配置參考[jdepend使用说明|http://mojo.codehaus.org/jdepend-maven-plugin/],
{code:xml} <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>jdepend-maven-plugin</artifactId> <version>2.0-beta-2</version> </plugin> {code}增加 findbugz 检查,具体配置參考[findbugz使用说明|http://mojo.codehaus.org/findbugs-maven-plugin/usage.html],
{code:xml} <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>findbugs-maven-plugin</artifactId> <version>2.0.1</version> </plugin> {code}增加javadoc生成,具体配置參考[javadoc usage|http://maven.apache.org/plugins/maven-javadoc-plugin/usage.html]
{code:xml} <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-javadoc-plugin</artifactId> <version>2.7</version> <configuration> ... </configuration> </plugin> {code}增加 jxr 支持。JXR是一个生成java代码交叉引用和源码的html格式的工具。具体配置信息參考[jxr usage|http://maven.apache.org/plugins/maven-jxr-plugin/]。
注意,jxr没有必要在build阶段执行。
{code:xml} <reporting> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-jxr-plugin</artifactId> <version>2.1</version> </plugin> </plugins> </reporting> {code}增加 Cobertura 支持,它是一个代码覆盖率工具,能够用来评估具有对应測试的源码的比率。具体帮助在[这里|http://mojo.codehaus.org/cobertura-maven-plugin/index.html]。另外一个功能相似的软件是[EMMA|http://emma.sourceforge.net/samples.html],具体的帮助在[这里|http://mojo.codehaus.org/emma-maven-plugin/usage.html]。两个产品的比較文章在[这里|http://www.topcoder.com/tc?
module=Static&d1=features&d2=030107]。个人倾向于都要用,由于给出的指标不一样。都有參考作用。
{code:xml|title=Cobertura } <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>cobertura-maven-plugin</artifactId> <version>2.4</version> <configuration> <check> <branchRate>85</branchRate> <lineRate>85</lineRate> <haltOnFailure>true</haltOnFailure> <totalBranchRate>85</totalBranchRate> <totalLineRate>85</totalLineRate> <packageLineRate>85</packageLineRate> <packageBranchRate>85</packageBranchRate> <regexes> <regex> <pattern>com.example.reallyimportant.*</pattern> <branchRate>90</branchRate> <lineRate>80</lineRate> </regex> <regex> <pattern>com.example.boringcode.*</pattern> <branchRate>40</branchRate> <lineRate>30</lineRate> </regex> </regexes> </check> </configuration> <executions> <execution> <goals> <goal>clean</goal> <goal>check</goal> </goals> </execution> </executions> </plugin> {code}
{code:xml|title=EMMA} <reporting> ... <plugins> ... <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>emma-maven-plugin</artifactId> <version>1.0-alpha-3-SNAPSHOT</version> </plugin> ... </plugins> ... </reporting> {code}加入 javaNCSS 插件。它是一个java代码的度量工具,具体參考在[这里|http://mojo.codehaus.org/javancss-maven-plugin/]。
{code:xml} <reporting> <plugins> <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>javancss-maven-plugin</artifactId> <version>2.0-beta-2</version> </plugin> </plugins> </reporting> {code}h4. profile相关
. 问:profile可以设置为某个变量不存在的条件下激活?
答:使用。前缀,请看演示样例:{code:xml} <activation> <property> <name>!environment.type</name> </property> </activation> {code}h4. 部署相关
. 问:其它部署到server的方式和配置怎么配?
答:本文摘自 [http://blog.csdn.net/zyxnetxz/archive/2009/05/18/4199348.aspx]{panel} *Distribution Management* 用于配置分发管理。配置对应的产品公布信息,主要用于公布,在运行mvn deploy后表示要公布的位置 *# 配置到文件系统{code:xml} <distributionManagement> <repository> <id>proficio-repository<id> <name>Proficio Repository<name> <url>file://${basedir}/target/deploy<url> <repository> <distributionManagement> {code}*# 使用ssh2配置
{code:xml} <distributionManagement> <repository> <id>proficio-repository<id> <name>Proficio Repository<name> <url>scp://sshserver.yourcompany.com/deploy<url> <repository> <distributionManagement> {code}*# 使用sftp配置
{code:xml} <distributionManagement> <repository> <id>proficio-repositoryi<d> <name>Proficio Repository<name> <url>sftp://ftpserver.yourcompany.com/deploy<url> <repository> <distributionManagement> {code}*# 使用外在的ssh配置编译扩展用于指定使用wagon外在ssh提供,用于提供你的文件到对应的远程server。
{code:xml} <distributionManagement> <repository> <id>proficio-repository<id> <name>Proficio Repository<name> <url>scpexe://sshserver.yourcompany.com/deploy<url> <repository> <distributionManagement> <build> <extensions> <extension> <groupId>org.apache.maven.wagon<groupId> <artifactId>wagon-ssh-external<artifactId> <version>1.0-alpha-6<version> <extension> <extensions> <build> {code}*# 使用ftp配置
{code:xml} <distributionManagement> <repository> <id>proficio-repository<id> <name>Proficio Repository<name> <url>ftp://ftpserver.yourcompany.com/deploy<url> <repository> <distributionManagement> <build> <extensions> <extension> <groupId>org.apache.maven.wagongroupId> <artifactId>wagon-ftpartifactId> <version>1.0-alpha-6version> <extension> <extensions> <build> {code}{panel} h4. 插件配置
. 问:我用maven输出site,怎样设置输出为utf8编码?
答: 配置site插件的编码设置{code:xml} ... <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-site-plugin</artifactId> <version>2.0-beta-6</version> <configuration> <outputEncoding>UTF-8</outputEncoding> </configuration> </plugin> ... {code}
本文借鉴与http://aiape.iteye.com/blog/1455420