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                ### 定義 ``` 定義一個類,實現Servlet接口 public class ServletDemo1 implements Servlet ``` ### 配置 ``` 在web.xml中配置: <!--配置Servlet --> <servlet> <servlet-name>demo1</servlet-name> <servlet-class>cn.test.web.servlet.ServletDemo1</servlet-class> </servlet> <servlet-mapping> <servlet-name>demo1</servlet-name> <url-pattern>/demo1</url-pattern> </servlet-mapping> ``` ### 原理 ``` 1. 當服務器接受到客戶端瀏覽器的請求后,會解析請求URL路徑,獲取訪問的Servlet的資源路徑 2. 查找web.xml文件,是否有對應的<url-pattern>標簽體內容。 3. 如果有,則在找到對應的<servlet-class>全類名 4. tomcat會將字節碼文件加載進內存,并且創建其對象 5. 調用其方法 ``` ### Servlet3.0 ``` 支持注解配置。可以不需要web.xml了 ``` ``` 步驟: 1. 創建JavaEE項目,選擇Servlet的版本3.0以上,可以不創建web.xml 2. 定義一個類,實現Servlet接口 3. 復寫方法 4. 在類上使用@WebServlet注解,進行配置 ```
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