java--Solution Java compiler level does not match the version of the installed Java project facet error

A project was downloaded from the Web, and the following error was found when importing eclipse:

Check that the original JDK version is inconsistent, the project's default JDK configuration is 1.5, and on its own computer is 1.7.

You need to modify the configuration of two places as shown in:

Modify One:

Modified two:

After modifying these two places, you can!

Reference:

(1) http://blog.sina.com.cn/s/blog_87479ba60100x6wh.html

(2) http://blog.csdn.net/chszs/article/details/8125828

java--Solution Java compiler level does not match the version of the installed Java project facet error