modify api for expand

[EvenLjj]

add appendFilePath method and modify api for expand

[codecov[bot]]

Codecov Report

Merging #1229 (e4f0ea2) into master (cf4445a) will increase coverage by 0.13%. The diff coverage is 100.00%.

:exclamation: Current head e4f0ea2 differs from pull request most recent head d190a84. Consider uploading reports for the commit d190a84 to get more accurate results

@@             Coverage Diff              @@
##             master    #1229      +/-   ##
============================================
+ Coverage     72.02%   72.15%   +0.13%     
  Complexity      780      780              
============================================
  Files           410      410              
  Lines         17375    17385      +10     
  Branches       2703     2704       +1     
============================================
+ Hits          12514    12544      +30     
+ Misses         3479     3462      -17     
+ Partials       1382     1379       -3     

Impacted Files	Coverage Δ
.../java/com/alipay/sofa/rpc/common/RpcConstants.java	100.00% <ø> (ø)
...va/com/alipay/sofa/rpc/common/utils/FileUtils.java	64.94% <100.00%> (+2.72%)	:arrow_up:
...ipay/sofa/rpc/codec/bolt/SofaRpcSerialization.java	76.19% <100.00%> (+0.17%)	:arrow_up:
...sian/MultipleClassLoaderSofaSerializerFactory.java	86.66% <0.00%> (-6.67%)	:arrow_down:
.../alipay/sofa/rpc/metrics/lookout/RpcLookoutId.java	87.30% <0.00%> (-1.59%)	:arrow_down:
...om/alipay/sofa/rpc/server/triple/TripleServer.java	74.86% <0.00%> (-1.07%)	:arrow_down:
...ipay/sofa/rpc/tracer/sofatracer/RpcSofaTracer.java	91.06% <0.00%> (+0.74%)	:arrow_up:
...lipay/sofa/rpc/config/AbstractInterfaceConfig.java	76.56% <0.00%> (+0.83%)	:arrow_up:
...va/com/alipay/sofa/rpc/client/AbstractCluster.java	71.80% <0.00%> (+0.85%)	:arrow_up:
...ansport/bolt/ReuseBoltClientConnectionManager.java	69.56% <0.00%> (+1.44%)	:arrow_up:
... and 3 more

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