GeoScript

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Create GeoScript Web App with JNDI and MavenΒΆ

Create a web app Project:

mvn archetype:generate -B -DgroupId=org.geo -DartifactId=geo-web -DarchetypeArtifactId=maven-archetype-webapp

Move into the new directory:

cd geo-web

Add Tomcat Plugin to the pom.xml file:

<plugins>
    <plugin>
      <groupId>org.apache.tomcat.maven</groupId>
      <artifactId>tomcat7-maven-plugin</artifactId>
      <version>2.2</version>
    </plugin>
</plugins>

Add geoscript as a dependency in the pom.xml file:

<repositories>
    <repository>
        <id>boundless</id>
        <name>Boundless Maven Repository</name>
        <url>http://repo.boundlessgeo.com/main</url>
        <snapshots>
            <enabled>true</enabled>
        </snapshots>
    </repository>
</repositories>

<depenencies>
    <dependency>
        <groupId>org.geoscript</groupId>
        <artifactId>geoscript-groovy</artifactId>
        <version>1.4.0</version>
    </dependency>
<depenencies>

Set up groovlets by adding a servlet to the src/main/webapp/WEB-INF/web.xml file:

<servlet>
    <servlet-name>Groovy</servlet-name>
    <servlet-class>groovy.servlet.GroovyServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>Groovy</servlet-name>
    <url-pattern>*.groovy</url-pattern>
</servlet-mapping>

Now register a JNDI datasource to a PostGIS database.

First, create the src/main/webapp/META-INF directory:

mkdir src/main/webapp/META-INF

Next, create a src/main/webapp/META-INF/context.xml file with a connection to our database:

<Context>
  <Resource name="jdbc/geoscript"
         auth="Container"
         type="javax.sql.DataSource"
         username="your_user_name_here"
         password="super_secret_password_here"
         driverClassName="org.postgresql.Driver"
         url="jdbc:postgresql://localhost:5432/states"
         maxActive="2"
         maxIdle="2"/>
</Context>

Then, tell our web app about this datasource by registering it with our src/main/webapp/WEB-INF/web.xml file:

<resource-ref>
    <res-ref-name>jdbc/datasourcename</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
</resource-ref>

Finally, we need to add the Postgres dependency to the tomcat maven plugin in the pom.xml file:

<plugin>
    <groupId>org.apache.tomcat.maven</groupId>
    <artifactId>tomcat7-maven-plugin</artifactId>
    <version>2.2</version>
    <dependencies>
        <dependency>
          <groupId>postgresql</groupId>
          <artifactId>postgressql</artifactId>
          <version>8.4-701.jdbc2</version>
        </dependency>
    </dependencies>
</plugin>

Now that we have our JNDI datasource set up, let’s write a Groovlet called src/main/webapp/layers.groovy:

import geoscript.workspace.PostGIS

PostGIS postgis = new PostGIS("java:comp/env/jdbc/geoscript", schema: "public")

html.html {
    head {
        title("Layers")
    }
    body {
        h1("Layers")
        ul {
            postgis.names.each { name ->
                li("${name}")
            }
        }
    }
}

Let’s run the app:

mvn clean install tomcat7:run

And open the following url in our web browser:

http://localhost:8080/geo-web/layers.groovy

In the previous example we used PostGIS, but we can also use GeoDB, a spatially enabled H2 database.

First, use git to clone the geodb project:

git clone https://github.com/jdeolive/geodb.git

Then, move into the directory:

cd geodb

And build the project with maven:

mvn clean install assembly:assembly

Unzip the compiled and assembled zip file:

unzip target/geodb-0-SNAPSHOT-app.zip

And then run geodb to start a spatially enabled H2 server:

geodb-0-SNAPSHOT/bin/geodb -w

Add A resource to the src/main/webapp/META-INF/context.xml file:

<Resource name="jdbc/h2"
  auth="Container"
  type="javax.sql.DataSource"
  driverClassName="org.h2.Driver"
  url="jdbc:h2:tcp://localhost/test"
  username="sa"
  password=""
  maxActive="2"
  maxIdle="2"/>

and a resource-ref to src/main/webapp/WEB-INF/web.xml file:

<resource-ref>
    <res-ref-name>jdbc/h2</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
</resource-ref>

Add an H2 dependency to the tomcat plugin in the pom.xml file:

<plugin>
    <groupId>org.apache.tomcat.maven</groupId>
    <artifactId>tomcat7-maven-plugin</artifactId>
    <version>2.2</version>
    <dependencies>
        <dependency>
          <groupId>com.h2database</groupId>
          <artifactId>h2</artifactId>
          <version>1.1.119</version>
        </dependency>
    </dependencies>
</plugin>

Add a new groovylet src/main/webapp/h2.groovy:

import geoscript.workspace.H2

H2 h2 = new H2("java:comp/env/jdbc/h2")

html.html {
    head {
        title("H2 Layers")
    }
    body {
        h1("H2 Layers")
        ul {
            h2.names.each { name ->
                li("${name}")
            }
        }
        table (border: 1) {
            th("geometry")
            h2["SPATIAL"].eachFeature { f ->
                tr {
                    td("${f.geom}")
                }
            }
        }
    }
}

Let’s run the app:

mvn clean install tomcat7:run

And open the following url in our web browser:

http://localhost:8080/geo-web/h2.groovy