首先看下tomcat文件夾下面的 logs裏面的localhost日誌裏面沒有報錯，那麼可能就是你的java JDK版本和tomcat版本不統一。下面是JDK版本和tomcat對應版本：
| Servlet規格 | JSP規範 | EL規格 | WebSocket規範 | 認證（JASIC）規範 | Apache Tomcat版本 | 最新發行版本 | 支持的Java版本 |
|---|---|---|---|---|---|---|---|
| 5.0 | 3.0 | 4.0 | 2.0 | 2.0 | 10.0.x | 10.0.0-M3 (alpha) | 8 and later |
| 4.0 | 2.3 | 3.0 | 1.1 | 1.1 | 9.0.x | 9.0.33 | 8 and later |
| 3.1 | 2.3 | 3.0 | 1.1 | 1.1 | 8.5.x | 8.5.53 | 7 and later |
| 3.1 | 2.3 | 3.0 | 1.1 | N/A | 8.0.x (superseded) | 8.0.53 (superseded) | 7 and later |
| 3.0 | 2.2 | 2.2 | 1.1 | N/A | 7.0.x | 7.0.103 | 6 and later (7 and later for WebSocket) |
| 2.5 | 2.1 | 2.1 | N/A | N/A | 6.0.x (archived) | 6.0.53 (archived) | 5 and later |
| 2.4 | 2.0 | N/A | N/A | N/A | 5.5.x (archived) | 5.5.36 (archived) | 1.4 and later |
| 2.3 | 1.2 | N/A | N/A | N/A | 4.1.x (archived) | 4.1.40 (archived) | 1.3 and later |
| 2.2 | 1.1 | N/A | N/A | N/A | 3.3.x (archived) | 3.3.2 (archived) | 1.1 and later |