JSP中String的有关问题
日期：2014-05-18 浏览次数：20937 次
JSP中String的问题
<%@ 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 JSP
An 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---------------
------解决方案--------------------
b=a.subString(3,3);
S 应该小写吧
b = a.substring(3,3);
------解决方案--------------------
jsp页面默认会导入java.lang包~~~应该不用再舔加~~
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
------解决方案--------------------
不是这个意思，第一个3表示从第4个元素开始。第2个3表示结束在第3个元素。
所以楼主的方法即使编译成功也不会输出结果。
我的异常网推荐解决方案：org.apache.jasper.JasperException: Unable to compile class,http://www.aiyiweb.com/j2ee/2308.html
<%@ 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 JSP
An 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---------------
------解决方案--------------------
b=a.subString(3,3);
S 应该小写吧
b = a.substring(3,3);
------解决方案--------------------
jsp页面默认会导入java.lang包~~~应该不用再舔加~~
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
------解决方案--------------------
不是这个意思，第一个3表示从第4个元素开始。第2个3表示结束在第3个元素。
所以楼主的方法即使编译成功也不会输出结果。
我的异常网推荐解决方案：org.apache.jasper.JasperException: Unable to compile class,http://www.aiyiweb.com/j2ee/2308.html
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