为啥请求转发不能打印到浏览器上

问题相关代码，请勿粘贴截图

package com.lywang03;

import jakarta.servlet.RequestDispatcher;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;
import java.io.PrintWriter;
public class AServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setAttribute("name", "A");
response.setContentType("text/html"); //设置输出格式为html
PrintWriter out = response.getWriter();
out.print(request.getAttribute("name"));//请求转发后，这里的代码没有执行
System.out.println("AA"); //这里的可以正常执行
RequestDispatcher rd = request.getRequestDispatcher("/B");
rd.forward(request, response);

}

}

package com.lywang03;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;

public class BServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
Object obj=req.getAttribute("name");
System.out.println(obj);
}
}

用下面这个，System.out.println(obj);是打印在控制台的，不会输出到浏览器。

resp.getWriter().write(obj);