老师，为啥我for循环里面使用return时，返回空白页面，不显示查询结果呢？

package com.imooc.servlet;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class SearchGoodsByIdServlet
 */
@WebServlet("/search")
public class SearchGoodsByIdServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public SearchGoodsByIdServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		ServletContext context=request.getServletContext();
		String id=request.getParameter("id");
		Goods result=null;
		List<Goods> list=(List)context.getAttribute("goodsList");
		for(Goods goods:list) {
			if((goods.getGoodsId().toString()).equals(id)) {
				result=goods;
				break;
				//return;
			}
		}
		context.setAttribute("result",result);
		request.getRequestDispatcher("searchById.jsp").forward(request,response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

​

使用break时 就可以显示出正常的查询结果界面，，为啥呢？