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比如输出一个Hello world?

plugin.xml

<project-components>
    <component>
        <implementation-class>com.thoughtworks.pli.intellij.remotepair.RemotePairProjectComponent</implementation-class>
    </component>
</project-components>

RemotePairProjectComponent.scala

package com.thoughtworks.pli.intellij.remotepair

import com.intellij.openapi.fileEditor.FileEditorManager
import com.intellij.openapi.fileEditor.FileEditorManagerAdapter
import com.intellij.openapi.vfs.VirtualFile
import org.jetbrains.annotations.NotNull
import com.intellij.util.messages.MessageBusConnection
import com.intellij.openapi.fileEditor.FileEditorManagerListener
import com.intellij.openapi.components.ProjectComponent
import com.intellij.openapi.project.Project

class RemotePairProjectComponent(project: Project) extends ProjectComponent {

  override def initComponent() {
    System.out.println("##### RemotePairProjectComponent.initComponent")
    System.out.println("## project: " + project)
  }

  override def disposeComponent() {
  }

  override def getComponentName: String = "RemotePairProjectComponent"

  override def projectOpened() {
    System.out.println("########## projectOpened: Hello world!")
  }

  override def projectClosed() {
  }

}

运行

运行该插件，在打开的新idea中，打开一个新项目，则会在console中输出：

## project: Project '/Users/freewind/IdeaProjects/test' test
########## projectOpened