1.设置eclipse工作空间的编码   window->preference->general->workspace->text file encoding （左下角）->other->utf-8

2.设置之前项目的编码   项目名称单击右键->properties->resource->test file encoding->other->utf-8

3.设置.properties文件的编码   window->preferences->general->content types->text->java properties file->default encoding设置为UTF-8  之后点击update

如果上面设置都有问题，进行下面的第四步

4.右键单击properties文件->properties->resource->test file encoding->utf-8