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分享关于equals的错误？
<%
String username=request.getParameter("username");out.println(username);
String submit=request.getParameter("Submit");out.println(submit);
//添上下一句就出错
if(submit.equals("登陆")){
}
错到哪了？谢谢
String username=request.getParameter("username");out.println(username);
String submit=request.getParameter("Submit");out.println(submit);
//添上下一句就出错
if(submit.equals("登陆")){
}
错到哪了？谢谢
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周口店的程序猿 2006-11-10
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你这么写就不会异常了
if("登陆".equals(submit)){
if("登陆".equals(submit)){
yougucao379548695 2006-11-10
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习惯！
cfan_haifeng 2006-11-09
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哈哈，知道原因了！
好像是因为我直接运行此页面造成的，因为此时submit=null，不等于""
所以出错！
好像是因为我直接运行此页面造成的，因为此时submit=null，不等于""
所以出错！
cfan_haifeng 2006-11-09
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错误如下：
exception
org.apache.jasper.JasperException: Exception in JSP: /login_deal.jsp:11
8: <jsp:useBean id="connBean" scope="page" class="beans.ConnDB"/>
9: <body>
10:
11: <%
12: String username=request.getParameter("username");out.println(username);
13: String submit=request.getParameter("Submit");out.println(submit);
14: if(submit.equals("登陆")){
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:506)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:395)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
exception
org.apache.jasper.JasperException: Exception in JSP: /login_deal.jsp:11
8: <jsp:useBean id="connBean" scope="page" class="beans.ConnDB"/>
9: <body>
10:
11: <%
12: String username=request.getParameter("username");out.println(username);
13: String submit=request.getParameter("Submit");out.println(submit);
14: if(submit.equals("登陆")){
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:506)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:395)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
