如何访问 html 内容中 try-catch 块内声明的变量？

Question

我是 jsp、java servlet 等的新手。我遇到了一个问题，我有一个 jsp 页面，它包含一个 try-catch 块脚本。我在 try-catch 块中定义了一些变量，我需要在 HTML 中访问它们。由于它位于 try-catch 块内，html 页面无法访问这些变量及其成员变量。

<%
    Logger logger = Logger.getLogger("abcd.jsp");
    try{
        UserProfile u = su.getUserProfile(session,request);
        String rec_typestr = request.getParameter("rectype");;
        int rectype = Integer.parseInt(rec_typestr);
        ....
        ....
        //some more code
    }
    catch(NumberFormatException e) {
        logger.error("Error in the request: " + e.getMessage());
        response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Invalid rectype passed in request");
        return;
    }
%>

<div id="testDiv1">
    <div class="testClass1">
        Private Views for <%=u.getFirstName() + " "%> <%=u.getLastName()%>
    </div>
    <div class="testClass2">
        <input type="button" value="Create" class="genericButton" onclick="displayLink('openSomePage.jsp?rectype=<%=rectype%>')" /> 
        <input type="button" value="Refresh" class="genericButton" onclick="perform1stTask()" /> 
            <input type="button" value="Print" class="genericButton" onclick="perform2ndTask()" /> 
            <input type="button" value="Export to Excel" class="genericButton" onclick="perform3rdTask(<%=u.getId()%>,'<%=someTestVariable%>', '<%=rec_typestr%>')" />
    </div>
</div>

现在变量 u、rectype_str 和 rectype 如果声明在外部尝试可以通过 html 页面访问，但我想在将它们包含在 try 之后访问它们，因为一些其他验证对 public 论坛是机密的。

因为如果捕获异常然后返回错误页面并且不需要加载html内容，我想要一个解决方案来加载这个html内容仅当 try 块成功执行且没有任何异常时。

Answer 1

如果我理解了你的需求，你可以按如下方式进行：

<%
    Logger logger = Logger.getLogger("abcd.jsp");
    try{
        UserProfile u = su.getUserProfile(session,request);
        String rec_typestr = request.getParameter("rectype");;
        int rectype = Integer.parseInt(rec_typestr);
        ....
        ....
        //some more code
%>
        <div id="testDiv1">
            <div class="testClass1">
                Private Views for <%=u.getFirstName() + " "%> <%=u.getLastName()%>
            </div>
            <div class="testClass2">
                <input type="button" value="Create" class="genericButton" onclick="displayLink('openSomePage.jsp?rectype=<%=rectype%>')" /> 
                <input type="button" value="Refresh" class="genericButton" onclick="perform1stTask()" /> 
                    <input type="button" value="Print" class="genericButton" onclick="perform2ndTask()" /> 
                    <input type="button" value="Export to Excel" class="genericButton" onclick="perform3rdTask(<%=u.getId()%>,'<%=someTestVariable%>', '<%=rec_typestr%>')" />
            </div>
        </div>

<%        
    }
    catch(NumberFormatException e) {
        logger.error("Error in the request: " + e.getMessage());
        response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Invalid rectype passed in request");
        return;
    }
%>

如何访问 html 内容中 try-catch 块内声明的变量？

How to access variables declared inside try-catch block in html content?

java

jsp

scope

scriptlet