UC知道jsp 500错误
来源：百度知道 编辑：UC知道 时间：2024/06/23 07:15:24
报错信息：
HTTP Status 500 -
--------------------------------------------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Exception in JSP: /logincheck.jsp:27
24: ResultSet rs=null;
25: String sqlstring = "select * from chatuser where username='"+ regName +"' and password='"+ regPassword + "'";;
26: rs = sqlbean.executeQuery(sqlstring);
27: if(rs.next())
28: {
29:
30: String experience=rs.getString("experience");
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:504)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
org.apache.jasper
HTTP Status 500 -
--------------------------------------------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Exception in JSP: /logincheck.jsp:27
24: ResultSet rs=null;
25: String sqlstring = "select * from chatuser where username='"+ regName +"' and password='"+ regPassword + "'";;
26: rs = sqlbean.executeQuery(sqlstring);
27: if(rs.next())
28: {
29:
30: String experience=rs.getString("experience");
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:504)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
org.apache.jasper
是Tomcat的错误，“The server encountered an internal error () that prevented it from fulfilling this request.
”：服务器遇到内部错误，阻止了它的响应请求
NullPointerException
27: if(rs.next())
rs为空啊！！！！！！！！！！！
一般都用while吧，你怎么用if啊
rs为空。
应该是根据用户名和密码没有查到相应的记录。
用if是可以的，因为如果用户名不允许重复，那么那个语句只能查出一条记录。
第27行，把if改成while，换言之，把判断改为循环
空指针异常，rs.next()，那里好像用if也可以把，查查别的地方有没有空的地方