| out1.close();
通过缓冲一个个读数据,然后一个个写数据.-1 为文件的末尾,
最后当读写完成后我们要关闭读写对象!
程序分析就是这样,以后还要对此问题进行研究,最后还要注意,
<%@ page contentType="image/jpeg;charset=GBK"%>
不是
<%@ page contentType="text/html;charset=GBK"%>
否则是以文字显示图片---乱码.
这里研究了上传图片到oralce 里面的程序,关于显示还要麻烦一点,借助资料我实现了,明天再研究一下.
//插入上传图片到数据库
<%@ page contentType="text/html;charset=GBK"%>
<%@ page import="java.util.*"%>
<%@ page import="java.io.*"%>
<%@ page import="org.apache.commons.*"%>
<%@ page import="org.apache.commons.fileupload.*"%>
<%@ page import="java.sql.*"%>
<%@ page import="javax.sql.*"%>
<%@ page import="javax.naming.*"%>
<%@ page import="oracle.sql.*"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">
<title>getPicture.jsp</title>
</head>
<body>
<%
request.setCharacterEncoding("GBK");
String name=null;
long size=0;
Connection conn=null;
String insert=" insert into uploadpicture "+
" values(?, empty_blob()) " ;
String findCursor=" select content "+
" from uploadpicture "+
" where name=? for update ";
String update=" update uploadpicture "+
" set content=? "+
" where name=? ";
BLOB blob=null;
InputStream is=null;
DiskFileUpload dfu=new DiskFileUpload();
dfu.setSizeMax(100000000);
dfu.setSizeThreshold(100000);
dfu.setRepositoryPath("f:\\public");
try{
List fileItems=dfu.parseRequest(request);
Iterator i=fileItems.iterator();
while(i.hasNext()){
FileItem fi=(FileItem)i.next();
if(!fi.isFormField()){
name=fi.getName();
size=fi.getSize();
if((name==null||name.equals(""))&&size==0)
continue;
}
name=fi.getName();
size=fi.getSize();
is=fi.getInputStream();
}
Context ctx=new InitialContext();
DataSource ds=(DataSource)ctx.lookup("jdbc/asdbCoreDS");
conn=ds.getConnection();
conn.setAutoCommit(false);
//step 1
PreparedStatement ps=conn.prepareStatement(insert);
ps.setString(1, name);
int a=ps.executeUpdate();
if(a>0)
out.println("insert success!"+"<br>");
//step 2
ps=conn.prepareStatement(findCursor);
ps.setString(1, name);
ResultSet rs=ps.executeQuery();
while(rs.next())
{
blob=(BLOB)rs.getBlob(1);
out.println("find cursor success!"+"<br>");
out.println("cursor :"+blob+"<br>");
//step 3
ps=conn.prepareStatement(update);
ps.setBlob(1, blob);
ps.setString(2, name);
ps.executeUpdate();
ps.close();
BufferedOutputStream out1 =new BufferedOutputStream(blob.getBinaryOutputStream());
BufferedInputStream in=new BufferedInputStream(is);
int c;
while((c=in.read())!=-1) {out1.write(c);}
in.close();
out1.close();
out.println("update success!"+"<br>");}
conn.commit();
}
catch(SQLException se)
{se.printStackTrace();}
catch(FileUploadException fue)
{fue.printStackTrace();}
%>
</body>
</html>
//显示数据库里面的图片
<%@ page contentType="image/jpeg;charset=GBK"%>
<%@ page import="java.sql.*"%>
<%@ page import="javax.sql.*"%>
<%@ page import="javax.naming.*"%>
<%@ page import="java.io.*"%>
<%@ page import="com.sun.image.codec.jpeg.*"%>
<%@ page import="javax.imageio.*"%>
<%@ page import="java.util.*"%>
<%@ page import="java.awt.image.*"%>
<html>
<head>
<meta http-equiv="Content-Type" content="image/jpeg; charset=GBK">
<title>showDBImage.jsp</title>
</head>
<body>
<%
String showImage=" select * "+
" from uploadpicture "+
" where name=''''TXC with snow.JPG'''' " ;
Connection conn=null;
BufferedInputStream inputImage=null;
try{
Context ctx=new InitialContext();
DataSource ds=(DataSource)ctx.lookup("jdbc/asdbCoreDS");
conn=ds.getConnection();
Statement st=conn.createStatement();
ResultSet rs=st.executeQuery(showImage);
while(rs.next())
{
oracle.sql.BLOB blob=(oracle.sql.BLOB)rs.getBlob("content");
inputImage =new BufferedInputStream(blob.getBinaryStream());
/*String name=rs.getString(1);
String content=rs.getString(2);
out.println(name+"<br>");*/}
BufferedImage image=null;
image=ImageIO.read(inputImage);
ServletOutputStream sos=response.getOutputStream();
JPEGImageEncoder encoder=JPEGCodec.createJPEGEncoder(sos);
encoder.encode(image);
inputImage.close();
conn.commit();
}
catch(SQLException se)
{se.printStackTrace();
conn.rollback(); }
catch(IOException ie)
{ie.printStackTrace();}
%>
</body>
</html>
上一页 [1] [2] | 
