Java jQuery-Servlet的AJAX调用

我正在为科学出版物商店构建一个web应用程序。我使用过MySQL、JSP、jQuery和JAVA

我在JSP页面中有一个表单，如下所示：

<form method="get">
    <input type="text" id="code">
    <button onclick="request()">Search</button>
</form>

Servlet执行一些操作，然后将查询结果集保存在请求对象中，并将结果转发到索引上，如下所示

request.setAttribute("result", resultSet);
RequestDispatcher dispatcher = this.getServletContext().getRequestDispatcher("/index.jsp");
dispatcher.forward(request, response);

index.jsp包含：

 <%  if(request.getAttribute("result")!=null){ %>
        <jsp:include page="table.jsp" />
  <%}%>

始终为空。

尝试让您的Servlet扩展HttpServlet，并按如下方式进行尝试：

public class TestServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;


    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doPost(request,response);
    }


    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        response.setCharacterEncoding("UTF-8");
        request.setAttribute("result", "value");
        request.getRequestDispatcher("/index.jsp").forward(request, response);
    }

}

---

看起来你把ajax和同步处理混为一谈了。一般来说，ajax响应将附加到servletresponse流中，而不是

request.setAttribute（“result”，resultSet）尝试使用会话，比如，
session.setAttribute（“result”，resultSet）.Nambari你说得对！我混合了两个不协调的概念。我回到表单上的简单“操作”，它调用servlet。谢谢
if(request.getAttribute("result"))

public class TestServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;


    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doPost(request,response);
    }


    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html");
        response.setCharacterEncoding("UTF-8");
        request.setAttribute("result", "value");
        request.getRequestDispatcher("/index.jsp").forward(request, response);
    }

}