idea plugin 插件开发

<idea-plugin>
    <!--插件id-->
    <id>com.xiaokai.test.demo</id>
    <!--插件名称-->
    <name>Demo</name>
    <!--开发者信息-->
    <!--插件说明-->
    <!-- please see http://www.jetbrains.org/intellij/sdk/docs/basics/getting_started/plugin_compatibility.html
         on how to target different products -->
    <!-- uncomment to enable plugin in all products
    <depends>com.intellij.modules.lang</depends>
    -->
    <!--依赖的其他插件能力-->
    <extensions defaultExtensionNs="com.intellij">
        <!-- Add your extensions here -->
    </extensions>
    <!--插件动作-->
    <actions>
        <group id="HelloWorld" text="_HelloWorld">
            <add-to-group group-id="MainMenu" anchor="last"/>
        </group>
        <action class="com.vince.test.HelloWorldAction" id="menuAction" text="menu action">
            <add-to-group group-id="HelloWorld" anchor="first"/>
        </action>
    </actions>
</idea-plugin>

package com.vince.test;
import com.intellij.openapi.actionSystem.AnAction;
import com.intellij.openapi.actionSystem.AnActionEvent;
import com.intellij.openapi.ui.Messages;
public class HelloWorldAction extends AnAction {
    @Override
    public void actionPerformed(AnActionEvent e) {
        Messages.showInfoMessage("Hello World!", "First Plugin");
    }
}