java - JSON Replacing '.' with -


i want program takes json file input , results json file. input file contains like:

{"empname":"surname.firstname","department.name":"production","salary":11254.42} 

the output file must replace '.'(dot) '_'(underscore) of input json. expecting output:

{"empname":"surname_firstname","department_name":"production","salary":11254_42} 

i want program using java, without using serialization , deserialization. can 1 help?

if using java 7+:

string str = new string(files.readallbytes(paths.get("in.json")), standardcharsets.utf_8)         .replace('.', '_');  files.write(paths.get("out.json"), str.getbytes("utf-8"), standardopenoption.write); 

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