我在JSP里写了一个FILE 提交到另一个页面但得到的值为空,为什么啊,谁知道?
代码如下:大家帮忙运行一下,看看什么问题
POSTBLOB。JSP
<!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>
<body>
<form action="testblob.jsp" method="get" >
<table width="291" border="1">
  <tr>
    <td width="107">id </td>
    <td width="168"><input name="id" type="text" /></td>
  </tr>
  <tr>
    <td>file</td>
    <td><input name="file" type="file" /></td>
  </tr>
  <tr>
    <td><input  type="submit"  value="提交"/></td>
    <td><input  type="text" value="" name="good" /></td>
  </tr>
</table>
</form>
</body>
</html>
TESTBLOB。JSP
<%@ page contentType="text/html;charset=gb2312"%> 
<%@ page import="java.sql.*" %>
<%@ page import="java.util.*"%>
<%@ page import="java.text.*"%>
<%@ page import="java.io.*"%> 
<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>
<body>
<% String id=null;
   String file=null;
 id=request.getParameter("id");
 file=request.getParameter("file");
String s= request.getParameter("good");
 out.print(id);System.out.println(id);
 out.print(file);System.out.println(file);
 out.print(s);
// FileInputStream str=new FileInputStream(file);
// out.print(str.available());
//   java.sql.Connection conn; 
//   java.lang.String strConn; 
//   Class.forName("oracle.jdbc.driver.OracleDriver").newInstance(); 
//   conn= java.sql.DriverManager.getConnection("jdbc:oracle:thin:@10.71.200.198:1521:test","ghx","123456"); 
// String sql="insert into test(id,pic) values(?,?)"; 
// PreparedStatement pstmt=conn.prepareStatement(sql); 
// pstmt.setString(1,id);
// pstmt.setBinaryStream(2,str,str.available()); 
//pstmt.execute(); 
//out.println("Success,You Have Insert an Image Successfully");
// pstmt.close();
%> 
<a href="readblob.jsp">查看图片</a>
<a href="postblob.html">返回</a>
</body>
</html>
READBLOB。JSP
<%@ page contentType="text/html;charset=gb2312"%> 
<%@ page import="java.sql.*, javax.sql.*" %>
<%@ page import="java.util.*"%>
<%@ page import="java.text.*"%>
<%@ page import="java.io.*"%> 
<!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><body>
<%
 
 java.sql.Connection conn;
 ResultSet rs=null;
  Class.forName("oracle.jdbc.driver.OracleDriver").newInstance(); 
   conn= java.sql.DriverManager.getConnection("jdbc:oracle:thin:@10.71.200.198:1521:test","ghx","123456"); 
   Statement stmt=conn.createStatement(); 
   rs=stmt.executeQuery("select * from mytest where id='1'");
  if(rs.next())
  {
    Blob b = rs.getBlob("pic");
   
 int size =(int)b.length();
      out.print(size);
  InputStream in=b.getBinaryStream();
  byte[] by= new byte[size];
  response.setContentType("image/jpeg"); 
  ServletOutputStream sos = response.getOutputStream();
     int bytesRead = 0;
       while ((bytesRead = in.read(by)) != -1) {
             sos.write(by, 0, bytesRead);
          }
         in.close();
         sos.flush();
    
  }
  
 
%>
</body>
</html>