TKNote: August 2011

Monday, August 29, 2011

Simple Spring

Download spring framework from (http://www.springsource.org/download) and commons-logging-1.1.1 from (http://commons.apache.org/logging/download_logging.cgi)
Unzip the spring-framework-3.1.0.M2-with-docs.zip and commons-logging-1.1.1-src.zip
Import all jar files contained in dist folder and commons-logging-1.1.1.jar into your project.
create Hellobean.java

public class HelloBean {
    private String helloWord;

    public void setHelloWord(String helloWord) {
        this.helloWord = helloWord;
    }

    public String getHelloWord() {
        return helloWord;
    }
}

5. create applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING/DTD BEAN/EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    <bean id="helloBean" class="com.cht.paas.springtest.HelloBean">
        <property name="helloWord">
            <value>Hello Hello Testing</value>
        </property>
    </bean>
</beans>

6. create demo java:

import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;

public class SpringDemo {
    public static void main(String[] args) {
        Resource rs = new FileSystemResource("applicationConfig.xml");
        BeanFactory factory = new XmlBeanFactory(rs);
        HelloBean hello = (HelloBean) factory.getBean("helloBean");
        hello.setHelloWord("This is setting hello world");
        System.out.println(hello.getHelloWord());

    }
}

References:

Sunday, August 28, 2011

Simple Jersey

Download the jersey.zip file from (http://download.java.net/maven/2/com/sun/jersey/jersey-archive/1.8/jersey-archive-1.8.zip)
nzip jersey-archive-1.8.zip and import all the jar files contained lib folder.
Create Hello.java:

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
@Path("/hello")
public class Hello {
// This method is called if TEXT_PLAIN is request
@GET
@Produces(MediaType.TEXT_PLAIN)
public String sayPlainTextHello() {
return "Hello World";
}
// This method is called if XML is request
@GET
@Produces(MediaType.TEXT_XML)
public String sayXMLHello() {
return "<?xml version=\"1.0\"?>" + "<hello> Hello Jersey" + "</hello>";
}
// This method is called if HTML is request
@GET
@Produces(MediaType.TEXT_HTML)
public String sayHtmlHello() {
return "<html> " + "<title>" + "Hello World" + "</title>"
+ "<body><h1>" + "Hello Jersey" + "</body></h1>" + "</html> ";
}
}

4. In web.xml, add the following context:

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    id="WebApp_ID" version="2.5">
    <display-name>JerseyTest</display-name>
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.htm</welcome-file>
        <welcome-file>index.jsp</welcome-file>
        <welcome-file>default.html</welcome-file>
        <welcome-file>default.htm</welcome-file>
        <welcome-file>default.jsp</welcome-file>
    </welcome-file-list>

    <display-name>Jersey Service</display-name>

    <servlet>
        <servlet-name>Jersey REST Service</servlet-name>
        <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>com.sun.jersey.config.property.packages</param-name>
            <param-value>com.cht.paas.jersey</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Jersey REST Service</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>

</web-app>

5. start your tomcat server and enter the url: http://localhost:8080/JerseyTest/rest/hello

References:

Friday, August 26, 2011

Easy to monitor CPU, memory, disk, and network states using SIGAR

Firstly, download the SIGAR API (e.g., hyperic-sigar-1.6.4.zip) from http://support.hyperic.com/display/SIGAR/Home
After unzipping hyperic-sigar-1.6.4, you can find two required folders (i.e., include and lib).
You have to put these folders into your workspace, and import these jar files.

the lib folder and include folder should be put in the same level (e.g., workspace/projectName/).

Use the following simple code, you can get system performance:

import org.hyperic.sigar.Cpu;
import org.hyperic.sigar.CpuInfo;
import org.hyperic.sigar.FileSystem;
import org.hyperic.sigar.NetStat;
import org.hyperic.sigar.Sigar;

public class PerformanceMonitor {

    private static Sigar sigar = new Sigar();

    public PerformanceMonitor() {
    }
    public static void main(String[] args) throws Exception {

        // For Disk
        System.out.println("-----Disk Info-----");
        FileSystem fileSystemList[] = sigar.getFileSystemList();
        for (int f = 0; f < fileSystemList.length; f++) {
            String devName = fileSystemList[f].getDevName();
            int devType = fileSystemList[f].getType();
            //Only get the physical disk
            if (devType == FileSystem.TYPE_LOCAL_DISK) {
                System.out.println("Disk " + devName);
                System.out.println(sigar.getDirUsage(devName));
                System.out.println(sigar.getDiskUsage(devName));
                System.out.println(sigar.getFileSystemUsage(devName));
            }
        }

        // For CPU
        System.out.println("-----CPU Info-----");
        System.out.println(sigar.getCpuPerc());
        System.out.println(sigar.getCpu());
        CpuInfo cpuInfoList[] = sigar.getCpuInfoList();
        Cpu cpuList[] = sigar.getCpuList();
        for (int c = 0; c < cpuInfoList.length; c++) {
            System.out.println("CPU " + c);
            System.out.println(cpuInfoList[c].toString());
            System.out.println(cpuList[c].toString());
        }

        // For Memory
        System.out.println("-----Memory Info-----");
        System.out.println(sigar.getMem());

        // For Network
        System.out.println("-----Network Info-----");
        System.out.println(sigar.getNetInfo());
        NetStat thisNetState = sigar.getNetStat();
        System.out.println("in-bound " + thisNetState.getAllInboundTotal()
                + " out-bound " + thisNetState.getAllOutboundTotal());
    }
}

Thursday, August 25, 2011

How to get project name under Tomcat server

import java.io.File;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class GetPathTest {
    private String webApps    = "webapps";
    private String webINF    = "WEB-INF";

    public String getClassPath(){
        return this.getClass().getClassLoader().getResource(File.separator).getPath();
    }

    public String getProjectName(){
        String classPath = getClassPath();
        Pattern pattern = Pattern.compile(webApps+".*"+webINF);
        Matcher matcher = pattern.matcher(classPath);
        String projectName = null ;
        while (matcher.find()) {
            projectName = matcher.group();
            projectName = projectName.substring(webApps.length()+1,projectName.length()-(webINF.length()+1));
        }
        if (projectName==null) return "null";
        return projectName;
    }
}

TKNote