编写一个类(Servlet) ，该类能访问完几个Servlet (至少=个，可在同-包下)后，还能在浏览器地址栏中显示出index.jsp路径。用refresh设置响应头字段

编写一个简单的Servlet，通常在Java Servlet API中实现，首先你需要创建一个继承自`HttpServlet`的类，并覆盖其核心方法如`doGet`或`doPost`。假设我们创建一个名为`MultiServlet`的类，它将遍历其他Servlet并最终返回index.jsp：

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(name = "MultiServlet", urlPatterns = {"/multi"})
public class MultiServlet extends HttpServlet {

    private static final String[] SUB_SERVLETS = {"SubServlet1", "SubServlet2"}; // 可替换为你实际的子Servlet名称

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 遍历子Servlet
        for (String subServletName : SUB_SERVLETS) {
            try {
                Class<?> clazz = Class.forName("com.yourpackage." + subServletName); // 请替换为你的包名和子Servlet类名
                Object servletInstance = clazz.newInstance();
                ((HttpServlet) servletInstance).service(request, response);
            } catch (ClassNotFoundException | IllegalAccessException | InstantiationException e) {
                e.printStackTrace();
            }
        }

        // 设置响应头字段 refresh
        response.setHeader("Refresh", "5; URL=/index.jsp"); // 5秒后跳转到index.jsp页面
        response.sendRedirect("/index.jsp"); // 立即发送redirect
        response.getWriter().println("<meta http-equiv='refresh' content='5;URL=/index.jsp'>"); // 显示刷新提示
    }

    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }
}

在这个例子中，你需要确保`SubServlet1`和`SubServlet2`已经在同一个包（或父包）中，且它们也是`HttpServlet`的子类。