servlet类中throws抛出异常出错？

package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.GenericServlet;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class ServletSample extends GenericServlet {

public void service(ServletRequest request,ServletResponse response){
    throws ServletException,IOException  {
        response.setCharacterEncoding("gbk");
        PrintWriter out=response.getWriter();
        out.println("<html>");
        out.println("head");
        out.println("<title>简单的例子</title>");
        out.print("</head>");
        out.println("<body>");
        out.println("<center>");
        out.println("<h2>这是第一个servlet的例子</h2>");
        out.println("</center>");
        out.print("</body>");
        out.println("</html>");
        out.close();
    }
}

}

帮帮忙，我是初学者，请多多指教，谢谢

多了一组大括号

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