关于统一表达式语言的隐式对象，Java EE 5教程写道:

Implicit Objects The JSP expression language defines a set of implicit objects: pageContext: The context for the JSP page. Provides access to various objects including: servletContext: The context for the JSP page’s servlet and any web components contained in the same application. See Accessing the Web Context. session: The session object for the client. See Maintaining Client State. request: The request triggering the execution of the JSP page. See Getting Information from Requests. response: The response returned by the JSP page. See Constructing Responses. In addition, several implicit objects are available that allow easy access to the following objects: param: Maps a request parameter name to a single value paramValues: Maps a request parameter name to an array of values header: Maps a request header name to a single value headerValues: Maps a request header name to an array of values cookie: Maps a cookie name to a single cookie initParam: Maps a context initialization parameter name to a single value Finally, there are objects that allow access to the various scoped variables described in Using Scope Objects. pageScope: Maps page-scoped variable names to their values requestScope: Maps request-scoped variable names to their values sessionScope: Maps session-scoped variable names to their values applicationScope: Maps application-scoped variable names to their values

有趣的部分是粗体:)

所以，为了回答你的问题，你应该能够像这样访问它(使用EL):

${param.accountID}

或者，使用JSP scriptlet(不推荐):

<%
    String accountId = request.getParameter("accountID");
%>

使用EL (JSP表达式语言):

$ {param.accountID}

request.getParameter("accountID")就是你要找的。这是Java Servlet API的一部分。更多信息请参见http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/ServletRequest.html。

如果我可以在这里补充评论的话……

< c: value = " $ {param.accountID} " > < / c: >

对我不起作用(它输出0)。

相反，这是可行的:

< c: value = " ${参数[' accountID ']} " > < / c: >

在GET请求中，请求参数取自查询字符串(URL上问号后面的数据)。例如，URL http://hostname.com?p1=v1&p2=v2包含两个请求参数- - p1和p2。在POST请求中，请求参数来自查询字符串和在请求体中编码的已发布数据。

下面的例子演示了如何在生成的输出中包含一个请求参数的值:

Hello <b><%= request.getParameter("name") %></b>!

如果使用URL访问页面:

http://hostname.com/mywebapp/mypage.jsp?name=John+Smith

结果输出将是:

Hello <b>John Smith</b>!

如果查询字符串上没有指定name，输出将是:

Hello <b>null</b>!

下面的例子使用了scriptlet中查询参数的值:

<%
    if (request.getParameter("name") == null) {
        out.println("Please enter your name.");
    } else {
        out.println("Hello <b>"+request. getParameter("name")+"</b>!");
    }
%>

第一页: 细节 第二页: <% String id = request.getParameter("userid") //现在您可以使用id查询HSQL详细产品