1. 将C盘下的.eclipse和.p2整个文件夹一起拷贝到你想放置的位置
2. 1.打开安装eclipse的路径，修改以下几个文件(默认路径是安装目录)：eclipse.ini 、configuration/config.ini、 configuration/org.eclipse.equinox.simpleconfigurator/bundles.info、configuration/org.eclipse.update/platform.xml。这些文件里面配置指向.eclipse .p2的路径改为步骤1的路径
3. 替换好新路径后，重新打开eclipse，完事了。
   eclipse.ini

···-data
E:\eclipse
-configuration
E:\eclipse
-startup
plugins/org.eclipse.equinox.launcher_1.6.200.v20210416-2027.jar
--launcher.library
E:\eclipse/.p2/pool/plugins/org.eclipse.equinox.launcher.win32.win32.x86_64_1.2.200.v20210429-1609
-product
org.eclipse.epp.package.jee.product
-showsplash
E:\eclipse\.p2\pool\plugins\org.eclipse.epp.package.common_4.20.0.20210612-1200
--launcher.defaultAction
openFile
--launcher.appendVmargs
-vm
G:\soft\jdk\jdk11\bin
-vmargs
-Duser.home=E:\eclipse
-Dosgi.requiredJavaVersion=11
-Dosgi.instance.area.default=@user.home/eclipse-workspace
-Dsun.java.command=Eclipse
-XX:+UseG1GC
-XX:+UseStringDeduplication
--add-modules=ALL-SYSTEM
-Dosgi.requiredJavaVersion=11
-Dosgi.dataAreaRequiresExplicitInit=true
-Dorg.eclipse.swt.graphics.Resource.reportNonDisposed=true
-Xms256m
-Xmx2048m
--add-modules=ALL-SYSTEM
-Declipse.p2.max.threads=10
-Doomph.update.url=http://download.eclipse.org/oomph/updates/milestone/latest
-Doomph.redirection.index.redirection=index:/->http://git.eclipse.org/c/oomph/org.eclipse.oomph.git/plain/setups/

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