我想要输入内容,然后保存下来。在写时,是分步调试的,正确。
把tomcat重启后,就不正确了 提示:
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:358)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
root cause
java.lang.NullPointerException
org.apache.jsp.ex29_jsp._jspService(ex29_jsp.java:74)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
note The full stack trace of the root cause is available in the Tomcat logs.
网页代码:
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*,java.io.*" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<%!
//**************处理中文******************
public String codetoString(String str)
{
String str2=str;
try{
byte b[]=str2.getBytes("iso-8859-1");
return str2=new String(b);
} catch(Exception e){return str2;}
}
%>
<%
//**************创建文件夹******************
File file1=new File("e:/ex29");
file1.mkdirs();
%>
<%
//**************创建文件******************
String textname=request.getParameter("textname");
String tempath="e:/ex29/"+textname;
File textpath=new File(tempath.toString());
if((!textpath.exists())&&textname!=null)
{out.print(textname+"创建成功");textpath.createNewFile();}
else if(textname!=null)
out.print("<font color='#ff00000'>"+"文件名以存在!"+"</font>");
FileWriter fw=new FileWriter(tempath);
PrintWriter pw=new PrintWriter(fw);
String strcontent=request.getParameter("content");
pw.println(codetoString(strcontent).toString());
fw.close();
%>
<body>
<form id="form1" name="form1" method="post" action="ex29.jsp">
<p>新建文件名 </p>
<label>
<input name="textname" type="text" id="textname" size="16" />
</label>
<p>文件内容</p>
<p>
<label></label>
<label>
<textarea name="content" id="content">er</textarea>
</label>
</p>
<p>
<label>
<input type="submit" name="Submit" value="提交" />
</label>
</p>
</form>
</body>
</html>