Use a map to replace the specified character variable in the string, and map to replace the string variable.

Use a map to replace the specified character variable in the string, and map to replace the string variable.
Reprinted, please specify the Source: success,
The contract content is roughly the same for each user, but there are several places to replace with the corresponding information,
For example, Party A, Party B's name, contract date, and contract amount. I wanted to find a third-party jar package to implement this function, but it was not suitable for a long time, so I wrote a simple method myself.