Java项目性能监控和调优工具-Javamelody

JavaMelody能够在运行环境监测Java或Java EE应用程序服务器。并以图表的形式显示：Java内存和Java CPU使用情况，用户Session数量，JDBC连接数，和http请求、sql请求、jsp页面与业务接口方法（EJB3、Spring、Guice）的执行数量，平均执行时间，错误百分比等。图表可以按天，周，月，年或自定义时间段查看。

监控效果图见本文结尾部分.

配置方式:

1.下载地址:http://code.google.com/p/javamelody/downloads/list

目前为止最新版本是1.47.0,下载地址:http://code.google.com/p/javamelody/downloads/detail?name=javamelody-1.47.0.zip&can=2&q=

2.下载后可以解压找到javamelody-1.47.0.jar和jrobin-1.5.9.1.jar,引用到项目中.

3.在web.xml中配置filter:

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<filter>

<filter-name>monitoring</filter-name>

<filter-class>net.bull.javamelody.MonitoringFilter</filter-class>

<init-param>

<param-name>log</param-name>

<param-value>true</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>monitoring</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

<listener>

<listener-class>net.bull.javamelody.SessionListener</listener-class>

</listener>

4.重启项目:打开链接:http://<host>:<port>/projectname/monitoring

例如:http://127.0.0.1:8080/myproj/monitoring

至此,基本配置已完成,可以进行简单的性能监控,下面配置是javamelody与struts2和spring3的集成配置:

5.javamelody和struts2集成时配置:

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<package name="base" namespace="/" extends="struts-default">

<result-types>

<result-type name="json" class="org.apache.struts2.json.JSONResult" />

</result-types>

<interceptors>

<!-- javamelody -->

<interceptor name="monitoring" class="net.bull.javamelody.StrutsInterceptor" />

<interceptor-stack name="myStack">

<interceptor-ref name="monitoring" />

<!--

struts默认的拦截器

-->

<interceptor-ref name="defaultStack" />

</interceptor-stack>

</interceptors>

<default-interceptor-ref name="myStack" />

其他struts配置文件继承base，如下所示：

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<package name="example" namespace="/" extends="base">

<action name="student_*" class="studentAction" method="{1}">

<result name="input">/pub_error.jsp</result>

</action>

</package>

6.javamelody与Spring集成:

spring的配置文件中配置:

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<bean id= "facadeMonitoringAdvisor" class="net.bull.javamelody.MonitoringSpringAdvisor" >

<property name ="pointcut" >

<bean class="org.springframework.aop.support.JdkRegexpMethodPointcut" >

<property name ="pattern" value="com.proj.*.service.*" /><!--正则表达式-->

</bean>

</property>

</bean>

然后配置:

方式一,web.xml中加入如下配置:

<context-param>

<param-name> contextConfigLocation</param-name>

<param-value>

classpath:applicationContext*.xml<!--Spring配置文件-->

classpath:net/bull/javamelody/monitoring-spring.xml<!--和spring集成时添加-->

</param-value>

</context-param>

方式二,在spring.xml中加入如下配置:

<import resource="classpath:net/bull/javamelody/monitoring-spring.xml" />

7.如果你的所有spring管理的bean都实现了接口,用步骤6中的配置一切OK,但如果有些bean没有实现接口,使用步骤6中的配置将会出错.

则将步骤6中的配置改为(这样将使用cglib代理):

spring配置文件中配置:

<bean id= "facadeMonitoringAdvisor" class="net.bull.javamelody.MonitoringSpringAdvisor" >

<property name ="pointcut" >

<bean class="org.springframework.aop.support.JdkRegexpMethodPointcut" >

<property name ="pattern" value="com.proj.*.service.*" /><!--正则表达式-->

</bean>

</property>

</bean>

方式一,web.xml中加入如下配置:

<context-param>

<param-name> contextConfigLocation</param-name>

<param-value>

classpath:applicationContext*.xml<!--Spring配置文件-->

classpath:net/bull/javamelody/monitoring-spring-aspectj.xml<!--和spring集成时添加-->

</param-value>

</context-param>

方式二,在spring.xml中加入如下配置:

<import resource="classpath:net/bull/javamelody/monitoring-spring-aspectj.xml" />

8.在项目中经常这样得到泛型类:

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private Class<T> entityClass = (Class<T>) ((ParameterizedType) getClass()

.getGenericSuperclass()).getActualTypeArguments()[0];

使用步骤7配置的cglib代理后会以上代码会出错,可以改为下面这种方式得到泛型类:

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private Class<T> entityClass = (Class<T>) getSuperClassGenricType(this

.getClass(), 0);

public static Class<?> getSuperClassGenricType(Class<?> clazz, int index)

throws IndexOutOfBoundsException {

Type genType = clazz.getGenericSuperclass();

if (!(genType instanceof ParameterizedType)) {

return Object.class;

}

Type[] params = ((ParameterizedType) genType).getActualTypeArguments();

if (index >= params.length || index < 0) {

return Object.class;

}

if (!(params[index] instanceof Class<?>)) {

return Object.class;

}

return (Class<?>) params[index];

}

9.javamelody缓存文件的清除:默认路径一般在tomcat_home/temp/javamelody中.

10.如果需要将结果导出为pdf,只要在项目中引用iText.jar即可自动加上导出pdf的链接.

11.javamelody与Quartz集成需要配置:

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<bean id="quartzScheduler" class="org.springframework.scheduling.quartz.SchedulerFactoryBean">

<property name="exposeSchedulerInRepository" value="true" />

...

</bean>

12.javamelody中配置可选参数:

web.xml中配置,以日志记录为例,如下配置将开启info级别的日志记录:

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<filter>

<filter-name>monitoring</filter-name>

<filter-class>net.bull.javamelody.MonitoringFilter</filter-class>

<init-param>

<param-name>log</param-name>

<param-value>true</param-value>

</init-param>

</filter>

其他可选参数:

system-actions-enabled:默认为true,控制启动或停止system actions garbage collector, http sessions, heap dump, memory histogram, process list, jndi tree, opened jdbc connections, database.

url-exclude-pattern:可配置正则表达式,排除一些url不监控.

http-transform-pattern,sql-transform-pattern,ejb-transform-pattern, spring-transform-pattern, guice-transform-pattern, error-transform-pattern, log-transform-pattern, job-transform-pattern, jsf-transform-pattern, struts-transform-pattern and jsp-transform-pattern
:可配置正则表达式,用于合并javamelody统计数据.

storage-directory: 默认为以javamelody,tomcat为例,默认存储路径为TOMCAT_HOME/temp/javamelody

monitoring-path:默认为:/monitoring,可以更改为其他地址,例如改为/mo,则监控地址改为:http://<host>:<port>/projectname/mo

no-database:默认false,配置为true将不监控和数据有关的行为.

disabled:默认false,配置为true将不再监控.

更多内容请参考:http://code.google.com/p/javamelody/wiki/UserGuide

效果图: