轉換基於Maven的Java專案支持Eclipse IDE

在過去的教學中，使用 Maven 創建了一個Java專案，但是這個專案不能導入到Eclipse IDE中，因為它不是 Eclipse 風格的專案。

這裏有一個指南，向您演示如何轉換 Maven 生成 Java 專案為 Eclipse 支持格式的專案。

1. mvn eclipse:eclipse

這真的很容易做到這一點。流覽到 Java 專案檔夾，其中 pom.xml 檔被重寫。併發出以下命令：

C:\worksp>mvn archetype:generate -DgroupId=com.zaixian -DartifactId=zaixiancor
[INFO] -------------------------------------------------------------------------
---
[INFO] Using following parameters for creating project from Old (1.x) Archetype:
 maven-archetype-quickstart:1.1
[INFO] -------------------------------------------------------------------------
---
[INFO] Parameter: basedir, Value: C:\worksp
[INFO] Parameter: package, Value: com.zaixian
[INFO] Parameter: groupId, Value: com.zaixian
[INFO] Parameter: artifactId, Value: zaixiancor
[INFO] Parameter: packageName, Value: com.zaixian
[INFO] Parameter: version, Value: 1.0-SNAPSHOT
[INFO] project created from Old (1.x) Archetype in dir: C:\worksp\zaixiancor
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 03:37 min
[INFO] Finished at: 2015-10-27T20:37:00+08:00
[INFO] Final Memory: 16M/185M
[INFO] ------------------------------------------------------------------------

看一個完整的例子：

C:\worksp>cd zaixiancor

C:\worksp\zaixiancor>mvn eclipse:eclipse
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building zaixiancor 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] >>> maven-eclipse-plugin:2.10:eclipse (default-cli) > generate-resources
@ zaixiancor >>>
[INFO]
[INFO] <<< maven-eclipse-plugin:2.10:eclipse (default-cli) < generate-resources
@ zaixiancor <<<
[INFO]
[INFO] --- maven-eclipse-plugin:2.10:eclipse (default-cli) @ zaixiancor ---
[INFO] Using Eclipse Workspace: null
[INFO] Adding default classpath container: org.eclipse.jdt.launching.JRE_CONTAI
ER
[INFO] Not writing settings - defaults suffice
[INFO] Wrote Eclipse project for "zaixiancor" to C:\worksp\zaixiancor.
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.737 s
[INFO] Finished at: 2015-10-27T20:39:15+08:00
[INFO] Final Memory: 13M/114M
[INFO] ------------------------------------------------------------------------

注意，如果你第一次運行這個命令，它可能需要一些時間來下載所有必需的依賴到你的專案，才能轉換為 Eclipse 風格的專案。

2. 驗證Java專案

在此之後，你會發現創建了兩個新檔 - “.classpath”和“.project”。這兩個檔都為 Eclipse IDE 所創建。

File : .classpath

<?xml version="1.0" encoding="UTF-8"?>
<classpath>
  <classpathentry kind="src" path="src/test/java" output="target/test-classes" including="**/*.java"/>
  <classpathentry kind="src" path="src/main/java" including="**/*.java"/>
  <classpathentry kind="output" path="target/classes"/>
  <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
  <classpathentry kind="var" path="M2_REPO/junit/junit/3.8.1/junit-3.8.1.jar"/>
</classpath>

注意
有沒有注意到，一個“M2_REPO” classpath變數已經生成？對於第一次，要將這個 M2_REPO classpath 變數添加到您的Eclipse IDE中。否則，Eclipse會在你的導入專案之後引發錯誤。

File : .project

<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
  <name>zaixiancor</name>
  <comment>NO_M2ECLIPSE_SUPPORT: Project files created with the maven-eclipse-plugin are not supported in M2Eclipse.</comment>
  <projects/>
  <buildSpec>
    <buildCommand>
      <name>org.eclipse.jdt.core.javabuilder</name>
    </buildCommand>
  </buildSpec>
  <natures>
    <nature>org.eclipse.jdt.core.javanature</nature>
  </natures>
</projectDescription>