代码如下:<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@page import="org.liu.model.entity.Student"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><html>
<head>
</head>
<% List<Student> list=(List<Student>)session.getAttribute("studentSelect");%>
<body>
<table width="70%" align="center">
<tr>
<td>编号</td>
<td>姓名</td>
<td>性别</td>
<td>年龄</td>
<td>班级</td>
<td>地址</td>
<td>修改</td>
</tr>
<% for(int i=0;i<list.size();i++){%>
<tr>
<td><%=list.get(i).getId() %></td>
<td><%=list.get(i).getName() %></td>
<td><%=list.get(i).getSex() %></td>
<td><%=list.get(i).getAge() %></td>
<td><%=list.get(i).getCid() %></td>
<td><%=list.get(i).getAddress() %></td>
<td>
<a href="update.jsp?id=<%=list.get(i).getId() %>&name=<%=list.get(i).getName() %>&mysex=<%=list.get(i).getSex() %>&myage=<%=list.get(i).getAge() %>&cid=<%=list.get(i).getCid() %>&address=<%=list.get(i).getAddress() %>">修改</a>
</td>
</tr>
<%} %>
</table>
</body>
</html>链接页面 也就是出错的页面:
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><html>
<head> </head>
<% String id=request.getParameter("id");
String name=request.getParameter("name");
String gbkName=new String(name.getBytes("ISO-8859-1"),"utf-8");
String sex=request.getParameter("mysex");
String gbkSex=new String(sex.getBytes("ISO-8859-1"),"utf-8");
String age=request.getParameter("myage");
String cid=request.getParameter("cid");
String address=request.getParameter("address");
String gbkAddress=new String(address.getBytes("ISO-8859-1"),"utf-8");
%>
<body>
<center>
<form action="action/isUpdate.jsp">
<input type="hiddon" name="id" value="<%=id %>"><br>
姓名:<input type="text" name="name" value="<%=gbkName %>"><br>
性别:<input type="text" name="sex" value="<%=gbkSex %>"><br>
年龄:<input type="text" name="age" value="<%=age %>"><br>
班级:<input type="text" name="cid" value="<%=cid %>"><br>
地址:<input type="text" name="address" value="<%=gbkAddress %>"><br>
<input type="submit" value="修改">
</form>
</center>
</body>
</html>
JDBC都没问题,可以查询出数据。但我点击那个修改链接后,update.jsp页面出错,但把文本框的value改成常量值后可以显示。请大家帮我看看 谢谢了!!
<%@page import="org.liu.model.entity.Student"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><html>
<head>
</head>
<% List<Student> list=(List<Student>)session.getAttribute("studentSelect");%>
<body>
<table width="70%" align="center">
<tr>
<td>编号</td>
<td>姓名</td>
<td>性别</td>
<td>年龄</td>
<td>班级</td>
<td>地址</td>
<td>修改</td>
</tr>
<% for(int i=0;i<list.size();i++){%>
<tr>
<td><%=list.get(i).getId() %></td>
<td><%=list.get(i).getName() %></td>
<td><%=list.get(i).getSex() %></td>
<td><%=list.get(i).getAge() %></td>
<td><%=list.get(i).getCid() %></td>
<td><%=list.get(i).getAddress() %></td>
<td>
<a href="update.jsp?id=<%=list.get(i).getId() %>&name=<%=list.get(i).getName() %>&mysex=<%=list.get(i).getSex() %>&myage=<%=list.get(i).getAge() %>&cid=<%=list.get(i).getCid() %>&address=<%=list.get(i).getAddress() %>">修改</a>
</td>
</tr>
<%} %>
</table>
</body>
</html>链接页面 也就是出错的页面:
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><html>
<head> </head>
<% String id=request.getParameter("id");
String name=request.getParameter("name");
String gbkName=new String(name.getBytes("ISO-8859-1"),"utf-8");
String sex=request.getParameter("mysex");
String gbkSex=new String(sex.getBytes("ISO-8859-1"),"utf-8");
String age=request.getParameter("myage");
String cid=request.getParameter("cid");
String address=request.getParameter("address");
String gbkAddress=new String(address.getBytes("ISO-8859-1"),"utf-8");
%>
<body>
<center>
<form action="action/isUpdate.jsp">
<input type="hiddon" name="id" value="<%=id %>"><br>
姓名:<input type="text" name="name" value="<%=gbkName %>"><br>
性别:<input type="text" name="sex" value="<%=gbkSex %>"><br>
年龄:<input type="text" name="age" value="<%=age %>"><br>
班级:<input type="text" name="cid" value="<%=cid %>"><br>
地址:<input type="text" name="address" value="<%=gbkAddress %>"><br>
<input type="submit" value="修改">
</form>
</center>
</body>
</html>
JDBC都没问题,可以查询出数据。但我点击那个修改链接后,update.jsp页面出错,但把文本框的value改成常量值后可以显示。请大家帮我看看 谢谢了!!
16: //String gbkSex=new String(sex.getBytes("ISO-8859-1"),"utf-8");
17: String aget=request.getParameter("myage");
18: int age=Integer.parseInt(aget);
19: String cidt=request.getParameter("cid");
20: int cid=Integer.parseInt(cidt);
21: String address=request.getParameter("address");
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:515)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:426)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause java.lang.NumberFormatException: null
java.lang.Integer.parseInt(Unknown Source)
java.lang.Integer.parseInt(Unknown Source)
org.apache.jsp.update_jsp._jspService(update_jsp.java:74)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:384)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.10 logs.第一个页面叫index.jsp 第二个叫update.jsp 我采用的是MVC模式。查询没问题 可以查出数据。上面是点击 index.jsp页面里的修改链接时出现的错误
可以接的到 我将所有的正型强制转换的注释后,再将value那里改为常量数字。可以显示出一些文本信息。如:姓名、地址。但性别和其他的出冲突。老和下一行数据显示在一行,而且还是乱码
17: String aget=request.getParameter("myage");
18: int age=Integer.parseInt(aget);
19: String cidt=request.getParameter("cid");
20: int cid=Integer.parseInt(cidt);
21: String address=request.getParameter("address");
这几句代码是哪个页面的,String aget=request.getParameter("myage");
这个取到null值了吧
lz你打日志看看aget这个值吧
null在parseInt的时候都是报这个错误!!!!
传递参数的问题
NumberFormatException
你那个i 是null
list.get(i) 的i
18: int age=Integer.parseInt(aget);