Optimize code and improve readability #1908

Job	Run time
build agent and cache	5m 23s
set-execution-conditions	14s
download midwares and cache	15s
Test for spring (1.5.0.RELEASE, Edgware.SR2, 1.5.0.RELEASE)	14m 29s
Test for spring (2.0.2.RELEASE, Finchley.RELEASE, 4.1.3, 2.0.0.RELEASE)	17m 58s
Test for spring (2.1.0.RELEASE, Greenwich.RELEASE, 4.2.6, 2.1.0.RELEASE)	16m 41s
Test for spring (2.2.0.RELEASE, Hoxton.RELEASE, 4.3.6, 2.2.0.RELEASE)	16m 16s
Test for spring (2.3.0.RELEASE, Hoxton.RELEASE, 4.4.1, 2.2.8.RELEASE)	17m 7s
Test for spring (2.4.0, 2020.0.0, 4.5.6, 2021.0.1.0)	13m 45s
Test for spring (2.6.2, 2021.0.0, 4.5.10, 2021.1)	13m 10s
Test for spring (2.7.2, 2021.0.3, 4.5.13)	13m 18s
	2h 8m 36s

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