Servlet:是一種託管在servlet容器裏的web組件,可以動態生成內容,servlet容器負責servlet的生命週期,接受請求和響應請求。
項目目錄如下:
MyServlet源代碼
package cn.lemon;
import java.io.IOException;
import javax.servlet.GenericServlet;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebServlet;
public class MyServlet extends GenericServlet {
public void service(ServletRequest request, ServletResponse response) throws ServletException, IOException {
response.getOutputStream().write("Hello MyServlet!".getBytes());
}
}
web.xml代碼
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:web="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" id="WebApp_9" version="2.4">
<servlet>
<servlet-name>MyServlet</servlet-name> <!--定義的servlet應用名字 -->
<servlet-class>cn.lemon.MyServlet</servlet-class> <!-- 具體的servlet文件 -->
</servlet>
<servlet-mapping>
<servlet-name>MyServlet</servlet-name> <!-- 地址映射 -->
<url-pattern>/s</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
</web-app>
注意:如果通過eclipse->new->servlet新建servlet不需要配置web.xml,會產生相應的註解。
如
@webservlet(urlpatterns={“/account”},
initparams={@webInitParam(name=”type”,value=”checking”)}
//初始化servelt參數,servletConfig.getInitParamter(“type”);
)
輸入網址
工作過程:
1 http://localhost:8080/MyServlet/s
2 找到tomcat上的MyServlet項目下的
<url-pattern>/s</url-pattern>
配置
3 然後獲取Servlet應用名
<servlet-name>MyServlet</servlet-name>
4 讀取具體的類
<servlet-class>cn.lemon.MyServlet</servlet-class>