java如何将对象从servlet传递到JSP？

1 年，4 月 Questions & Answers 211

我可以通过Integer、String、Float等等。。但是当我传递我定义的对象（Employee）时，JSP将它作为null接收

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1" import="com.rahul.model.bean.*"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>Search Result</title> </head> <body> <% Employee record = (Employee) request.getAttribute("searchResult"); out.println(record); %> <table border="1"> <tr> <th>Id</th> <th>Name</th> <th>Designation</th> <th>Department</th> <th>Salary</th> </tr> </table> </body> </html> And My Controlleer doGet is: protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException { EmployeeDAO dao = new EmployeeDAOImpl(); Employee result = dao.search(request.getParameter("id")); // PrintWriter pw=response.getWriter(); // pw.println(result); ServletContext app = getServletContext(); app.setAttribute("searchResult", result); System.out.println("Emp= "+result); response.sendRedirect("./searchview.jsp"); }

# 1 楼答案

试试这个：

欢迎小轿车。爪哇

import java.io.IOException;
import javax.servlet.RequestDispatcher;
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("/greetings")
public class GreetingsServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String message = "Hello, World";
        req.setAttribute("message", message);
        RequestDispatcher dispatcher = req.getServletContext().getRequestDispatcher("/WEB-INF/jsp/greetings.jsp");
        dispatcher.forward(req, resp);
    }

}

你好。jsp

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>JSP Page</title>
    </head>
    <body>
    <h1><%= request.getAttribute("message") %></h1>
    </body>
</html>

这不适用于sendRedirect，因为您基本上是在客户机和服务器之间进行往返，跨越2个请求，而不是一个请求。第一个请求有您的参数，但是由于您的客户端没有存储它，因此在重定向发生时它将丢失。您应该转发到JSP，除非servlet所做的事情不应该反复执行（比如数据库插入）。如果您真的需要重定向，请查看here

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java如何将对象从servlet传递到JSP？

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