测试地址:http://localhost/test.jsp?user_id=11
test.jsp 文件源码
<html>
<head>
<title>test</title>
</head>
<body bgcolor="#ffffff">
<%
int user_id = request.getParameter("user_id");
out.print(user_id);
%>
</body>
</html>出错提示:
org.apache.jasper.JasperException: Unable to compile class for JSPAn error occurred at line: 11 in the jsp file: /user_delete.jsp
Generated servlet error:
D:\Tomcat 5.0\work\Catalina\127.0.0.1\_\org\apache\jsp\user_005fdelete_jsp.java:63: incompatible types
found : java.lang.String
required: int
int user_id = request.getParameter("user_id");
本人是java初学者,请问这是哪里出错的。谢谢
test.jsp 文件源码
<html>
<head>
<title>test</title>
</head>
<body bgcolor="#ffffff">
<%
int user_id = request.getParameter("user_id");
out.print(user_id);
%>
</body>
</html>出错提示:
org.apache.jasper.JasperException: Unable to compile class for JSPAn error occurred at line: 11 in the jsp file: /user_delete.jsp
Generated servlet error:
D:\Tomcat 5.0\work\Catalina\127.0.0.1\_\org\apache\jsp\user_005fdelete_jsp.java:63: incompatible types
found : java.lang.String
required: int
int user_id = request.getParameter("user_id");
本人是java初学者,请问这是哪里出错的。谢谢
改为String user_id = request.getParameter("user_id");
int x = Integer.parseInt(user_id)
int x = 0 ;
if(user_id != null) //防止空指针
{
Integer.parseInt(user_id)
}
int x = 0 ;
if(user_id != null) //防止空指针
{
x = Integer.parseInt(user_id)
}