“!”的区别，为什么在刷新时不同？

不一样啊，下面是刷新4次后的结果。初始值：　 0123456789123456789123456789123456789
JSP 计算后：　 0123456789123456789123456789123456789123456789 　 --------------------------------------------------------------------------------
初始值：　 0
JSP 计算后：　 0123456789 　

解决方案 »

免费领取超大流量手机卡，每月29元包185G流量+100分钟通话, 中国电信官方发货

谁能给我解释一下，“！”在jsp中有什么特殊作用？
看一看处理过后的jsp类文件就应该很清楚了
package org.apache.jsp;import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import org.apache.jasper.runtime.*;public class test_jsp extends HttpJspBase { String str="0"; /**********页面变量***********/ private static java.util.Vector _jspx_includes; public java.util.List getIncludes() {
 return _jspx_includes;
 } public void _jspService(HttpServletRequest request, HttpServletResponse response)
 throws java.io.IOException, ServletException { JspFactory _jspxFactory = null;
 javax.servlet.jsp.PageContext pageContext = null;
 HttpSession session = null;
 ServletContext application = null;
 ServletConfig config = null;
 JspWriter out = null;
 Object page = this;
 JspWriter _jspx_out = null;
 try {
 _jspxFactory = JspFactory.getDefaultFactory();
 response.setContentType("text/html;charset=ISO-8859-1");
 pageContext = _jspxFactory.getPageContext(this, request, response,
 null, true, 8192, true);
 application = pageContext.getServletContext();
 config = pageContext.getServletConfig();
 session = pageContext.getSession();
 out = pageContext.getOut();
 _jspx_out = out; out.write("<HTML> \r\n隆隆 ");
 out.write("<HEAD>");
 out.write("<TITLE>JSP 脪鲁脙忙 ");
 out.write("</TITLE>");
 out.write("</HEAD> \r\n隆隆 ");
 out.write("<BODY>\r\n ");
 out.write(" \r\n ");
 out.write("\r\n ");
 out.write("\r\n鲁玫脢录脰碌拢潞隆隆 ");
 out.print( str );
 out.write(" \r\n");
for(int i=1; i < 10; i++) {
str = str + i;
}
 out.write("\r\nJSP 录脝脣茫潞贸拢潞 \r\n\r\n隆隆 ");
 out.print( str );
 out.write(" \r\n隆隆 ");
 out.write(" \r\n\r\n");
 out.write("<hr>\r\n\r\n");
String str1="0"; /************局部变量*****************/
 out.write("\r\n鲁玫脢录脰碌拢潞隆隆 ");
 out.print( str1 );
 out.write(" \r\n");
for(int i=1; i < 10; i++) {
str1 = str1 + i;
}
 out.write("\r\nJSP 录脝脣茫潞贸拢潞 \r\n隆隆 ");
 out.print( str1 );
 out.write(" \r\n隆隆 ");
 out.write(" \r\n\r\n\r\n隆隆 ");
 out.write("</BODY> \r\n隆隆 ");
 out.write("</HTML>");
 } catch (Throwable t) {
 out = _jspx_out;
 if (out != null && out.getBufferSize() != 0)
 out.clearBuffer();
 if (pageContext != null) pageContext.handlePageException(t);
 } finally {
 if (_jspxFactory != null) _jspxFactory.releasePageContext(pageContext);
 }
 }
}
有！为页面变量
没有！为私有变量！
举个例子！
class myBean()
{
    private String aaa;  //有i的定义。
    public void getStr()
    {
     private String bbb;  //无i的定义。    .......    }}
他们主要是变量的修饰附不同！
<%! String str="0"; %>
就是这句话了，如果出了问题就在这里，你们难道忘了，“＋”运算符号可能被从载了！
感谢liad提供下面的贴子
http://expert.csdn.net/Expert/TopicView1.asp?id=2334719
谢谢大家。