1,你的是什么数据库,不同数据库对BLOB子段的操作是不同的!
2,如果是SQL SERVER,则如下
String sql = "intsert into book(?,?,?)";
PreparedStatement pstmt = con.prepareStatement(sql) ;
File file = new File("C:/images/photo.jpg") ;
FileInputStream fis = new FileInputStream(file);
pstmt.setString(1, 0);
pstmt.setString(2, "John");
pstmt.setBinaryStream(3, fis, (int)file.length());
pstmt.executeUpdate();
pstmt.close();
fis.close();
2,如果是SQL SERVER,则如下
String sql = "intsert into book(?,?,?)";
PreparedStatement pstmt = con.prepareStatement(sql) ;
File file = new File("C:/images/photo.jpg") ;
FileInputStream fis = new FileInputStream(file);
pstmt.setString(1, 0);
pstmt.setString(2, "John");
pstmt.setBinaryStream(3, fis, (int)file.length());
pstmt.executeUpdate();
pstmt.close();
fis.close();
http://dev.csdn.net/article/59/59585.shtm
路径显示图片.
第一步：建立数据库
create table test_img(id number(4),name varchar(20),pic long raw); 第二步：（NewImg.html） <html><head><title>添加图片</title></head>
<body>
添加图片<br/>
<form method="post" action="insertNews.jsp">
图像ID：<input name="id" size="10">
<br/>
选择图像：<input type="file" name="image">
<br/>
<input type="submit" value="上传" name="submit" size="25">
<input type="reset" value="清除" name="clear" size="25">
<br/>
</form>
</body></html> 第三步：插入数据库（InsertImg.jsp） <%@ page language="java"%>
<%@ page contentType="text/html;charset=gb2312" %>
<%@ page import="java.util.*" %>
<%@ page import="java.sql.*"%>
<%@ page import="java.text.*"%>
<%@ page import="java.io.*"%> <%
Class.forName("oracle.jdbc.driver.OracleDriver");
String url="jdbc:oracle:thin:@lubin:1521:b2bdb";
Connection con=DriverManager.getConnection(url,"demo","demo"); //插入数据库
String sql="insert into test_img values (?,?,?)";
//获取传值ID
String id=request.getParameter("id");
//获取image的路径
String kk=request.getParameter("image");
//转换成file格式
File filename=new File(kk); //将文件的长度读出，并转换成Long型
long l1=filename.length();
int l2=(int)l1; //以流的格式赋值
FileInputStream fis=new FileInputStream(filename); PreparedStatement ps =con.prepareStatement(sql);
ps.setString(1,id);
ps.setString(2,filename.getName());
ps.setBinaryStream(3,fis,l2);
//ps.setBinaryStream(3,fis,fis.available());
ps.executeUpdate();
//ps.execute();
ps.close();
fis.close();
out.println("ok!!!");
%> 第四步：显示图片(ShowImg.jsp) <%@ page language="java" import="java.sql.*"%>
<%@ page import="java.io.*"%>
<%@ page contentType="text/html;charset=gb2312"%> <%
Class.forName("oracle.jdbc.driver.OracleDriver");
String url="jdbc:oracle:thin:@lubin:1521:b2bdb";
String image_id = (String) request.getParameter("ID"); Connection con=DriverManager.getConnection(url,"demo","demo");
PreparedStatement sql=con.prepareStatement("select * from test_img WHERE id = " + image_id);
ResultSet rs = sql.executeQuery(); rs.next();
//输入img字段内容到in
InputStream in = rs.getBinaryStream("img"); //以下可是任何处理,比如向页面输出: response.reset();
//此处的image/jpeg似乎与显示的图片格式无关
//因为我显示jsp和gif都没有错误
response.setContentType("image/jpeg");
byte[] b = new byte[1024];
int len;
while((len=in.read(b)) >0)
response.getOutputStream().write(b,0,len); in.close();
rs.close();
%>