Tomcat不同版本所对应的Servlet/JSP规范
http://blog.sina.com.cn/s/blog_5fa0e0c50100q0cf.html
| Servlet/JSP Spec | Apache Tomcat version | Actual release revision | Minimum Java Version |
| 3.0/2.2 | 7.0.x | 7.0.12 | 1.6 |
| 2.5/2.1 | 6.0.x | 6.0.32 | 1.5 |
| 2.4/2.0 | 5.5.x | 5.5.33 | 1.4 |
| 2.3/1.2 | 4.1.x (archived) | 4.1.40 (archived) | 1.3 |
| 2.2/1.1 | 3.3.x (archived) | 3.3.2 (archived) | 1.1 |