<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
</head><body>
<%
String a=new String("administrator");
String b;
b=a.subString(3,3);
out.print(a);
out.print(b);
%>
</body>
</html>
---------------------------------------------------
运行结果:
---------------
org.apache.jasper.JasperException: Unable to compile class for JSPAn error occurred at line: 10 in the jsp file: /Untitled-1.jsp
Generated servlet error:
D:\Program Files\Tomcat 5.0\work\Catalina\localhost\myjsp\org\apache\jsp\Untitled_002d1_jsp.java:56: cannot resolve symbol
symbol : method subString (int,int)
location: class java.lang.String
b=a.subString(3,3);
^
1 error org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:332)
org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:412)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
----------------------------请高手指导一二---------------
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
</head><body>
<%
String a=new String("administrator");
String b;
b=a.subString(3,3);
out.print(a);
out.print(b);
%>
</body>
</html>
---------------------------------------------------
运行结果:
---------------
org.apache.jasper.JasperException: Unable to compile class for JSPAn error occurred at line: 10 in the jsp file: /Untitled-1.jsp
Generated servlet error:
D:\Program Files\Tomcat 5.0\work\Catalina\localhost\myjsp\org\apache\jsp\Untitled_002d1_jsp.java:56: cannot resolve symbol
symbol : method subString (int,int)
location: class java.lang.String
b=a.subString(3,3);
^
1 error org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:332)
org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:412)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
----------------------------请高手指导一二---------------
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subString改成substring后依然出错;
但如果是改成<%
<%
String a=new String("administrator");
String b;
b=a.substring(3);
out.print(a);
out.print(b);
%>
能够正确运行!得到b值:inistrator
-------------------------
理论上应该可以不必导入java.lang.String,而且substring应该可以有两个参数。。但是为什么两个参数的时候会出错....
b = a.substring(3,3);这里错误~~~截截取字符串的结束位置一定要大于起始位置,不然会报错误,你改成b = a.substring(3,4); 就可以了
如果是(3,4)结果会是i;