背景！jsp+MySQL 記住 要用mysql的longblob類型來存默認的blob大小不夠
數(shù)據(jù)庫字段：ｉｄ （ｃｈａｒ） ｐｉｃ （longblob）
轉(zhuǎn)載請注明出處，這時我與我的知己的合作的結(jié)過
原來操作ｂｌｏｂ字段時都要先差個空值，在查ｂｌｏｂ，好麻煩，用ｐｒｅｐａｒｅＳｔａｔｍｅｎｔ就不用那么麻煩了，哈哈
postblob.heml頁面
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "<html xmlns="<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>無標題文檔</title>
</head>
<body>
<form action="testblob.jsp" method="post" >
<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>
</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="<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>無標題文檔</title>
</head>
<body>
<%
String id=request.getParameter("id");
String file=request.getParameter("file");
out.PRint(id);
out.print(file);
FileInputStream str=new FileInputStream(file);
out.print(str.available());
java.sql.Connection conn;
java.lang.String strConn;
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
conn= java.sql.DriverManager.getConnection("jdbc:mysql://localhost/test","root","");
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">查看圖片</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" "<html xmlns="<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>無標題文檔</title>
</head>
<body>
<%
java.sql.Connection conn;
ResultSet rs=null;
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
conn= java.sql.DriverManager.getConnection("jdbc:mysql://localhost/test","root","");
Statement stmt=conn.createStatement();
rs=stmt.executeQuery("select * from test 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>
********************************************************************
注意：在用sos.write(by, 0, bytesRead);時，該方法把inputstream中的內(nèi)容在一個新的頁面中輸出，
如果本頁中還有別的內(nèi)容要輸出的話，只有把上述方法改為，bytesRead = in.read(by)) ；
再用out.print(new String(by));方法輸出結(jié)果，注意在這里不能用by.toString()方法，該方法返回的是要輸出內(nèi)容的內(nèi)存地址。mysql中有blob textarea類型大小了66536基本上放點小的東東就足夠了，哈哈，但是現(xiàn)在的數(shù)碼ｐｉｃ越來越大就只能用longblob了 大小有４g能 ，放個電影都夠了哈哈
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