基础命令
拷贝依赖的jar
拷贝依赖的jar包到target-dependencies  可指定目录-DoutputDirectory=lib
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 | #scope #runtime : scope gives runtime and compile dependencies,
 #compile : scope gives compile, provided, and system dependencies,
 #test (default) : scope gives all dependencies,
 #provided : scope just gives provided dependencies,
 #system : 	scope just gives system dependencies.
 
 mvn dependency:copy-dependencies   -DincludeScope=compile -DoutputDirectory=lib
 
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