xml文件配置：

<servlet>

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<servlet-name>test1</servlet-name>//设定java文件链接的锚点

<servlet-class>cs</servlet-class>//cs为java文件的名字：cs.java

</servlet>

<servlet-mapping>

<servlet-name>test1<servlet-name>//设定锚点链接绳索

<url=pattern>/use</url=pattern>//设定浏览器使用的虚拟地址

</servlet-mapping>

import javax.servlet.*;
import java.io.IOException;

public class cs implements Servlet{//继承：implements servlet
    @Override
    public void init(ServletConfig servletConfig) throws ServletException {

    }

    @Override
    public ServletConfig getServletConfig() {
        return null;
    }

    @Override
    public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
        System.out.println("This change has come into effect!");
    }

    @Override
    public String getServletInfo() {
        return null;
    }

    @Override
    public void destroy() {

    }
}
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