Java garbled question mark solution

java garbled question marks are as shown below:

Everything involving Chinese characters has turned into a question mark, which is very strange. It is an international practice, starting from the html page Check,

It seems that the encoding is OK, and the Chinese characters in other modules of the page can be displayed normally, so I start to conclude that it is a background problem. Start looking at the action, and check the request and response. Set the encoding format to utf-8. After restarting the project, I found that it was still garbled.

Look at the code of my controller below:

The return value of service is as follows:

The background returns a json object , and what I passed to the front desk was of type string, so the problem occurred here. After changing the return value to a json object, everything went fine.

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