关于jsp中equals()方法的问题
<body>
<form action="denglu.jsp" method="post">
请输入账号:<input name="account" type="text"><br>
请输入密码:<input name="password" type="password">
<input type="submit" value="登陆">
</form>
<%
String str = request.getParameter("account");
String str1 = request.getParameter("password");
%>
<%
if(str.equals(str1)){
response.sendRedirect("denglu_result.jsp");
}
else{
out.print("密码错误!");
}
%>
</body>
本页面就是denglu.jsp ,我想做一个表单输入账号密码提交给本页,然后如果账号密码正确的话跳转到另一个页面。
下面是报错提示:
HTTP Status 500 - An exception occurred processing JSP page /denglu.jsp at line 25
type Exception report
message An exception occurred processing JSP page /denglu.jsp at line 25
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /denglu.jsp at line 25
22:
23: %>
24: <%
25: if(str.equals(str1)){
26: response.sendRedirect("denglu_result.jsp");
27:
28: }
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:575)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:477)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.NullPointerException
org.apache.jsp.denglu_jsp._jspService(denglu_jsp.java:108)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:439)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.70 logs.
Apache Tomcat/7.0.70
请各位大哥帮我看看。哪里有问题,早上运行一下还是可以的啊!