把图片从oracle数据库的blob字段中取出来，显示在浏览器上

最新推荐文章于 2021-01-16 05:30:25 发布

原创最新推荐文章于 2021-01-16 05:30:25 发布 · 322 阅读

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文章标签：

#浏览器 #Oracle #Struts #Java #SQL

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2 篇文章

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本文介绍了如何在不将图片保存到硬盘的情况下，直接从Oracle数据库的BLOB字段中取出图片并显示在浏览器上。通过Java代码示例展示了在JSP和Struts Action中实现这一功能的方法。

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转载自：http://heisetoufa.iteye.com/blog/227245

关键字: 显示浏览器图片

上两篇文章我发的一个是把图片从硬盘存到数据库里，和把图片从数据库里取出来存在硬盘上，这次再发个把图片从数据库里取出来直接显示在浏览器上，而不保存在硬盘上

先贴个在jsp里用的

Html代码

<%@ page language="java" pageEncoding="gbk" contentType="image/jpeg" import="java.awt.image.*,java.sql.*,com.sun.image.codec.jpeg.*,java.util.*,javax.imageio.*,java.io.*"%>
<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html:html lang="true">
<head>
<html:base />
<title>EPhotoDis.jsp</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<%
// Create image
String username,password,url;
Connection conn = null;
Statement stmt = null;
BufferedInputStream inputimage=null;
username="dzjc";
password="dzjc";
url ="jdbc:oracle:thin:@192.168.1.134:1521:zhpt";
Class.forName("oracle.jdbc.driver.OracleDriver");
conn=DriverManager.getConnection(url,username,password);
stmt=conn.createStatement();
boolean defaultCommit = conn.getAutoCommit();
conn.setAutoCommit(false);
try
{
ResultSet rs = stmt.executeQuery("SELECT img FROM dzjc_img");
while (rs.next())
{
oracle.sql.BLOB blob = (oracle.sql.BLOB)rs.getBlob("img");
inputimage = new BufferedInputStream(blob.getBinaryStream());
}
}
catch (Exception ex)
{
System.out.println("blobRead()'s exception"+ex);
conn.rollback();
throw ex;
}
conn.setAutoCommit(defaultCommit);
// Send back image
BufferedImage image = null;
try
{
image = ImageIO.read(inputimage);
}
catch(IOException e)
{
System.out.println(e);
}
ServletOutputStream sos = response.getOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
encoder.encode(image);
inputimage.close();
/*/**/
%>
</body>
</html:html>

<%@ page language="java" pageEncoding="gbk" contentType="image/jpeg" import="java.awt.image.*,java.sql.*,com.sun.image.codec.jpeg.*,java.util.*,javax.imageio.*,java.io.*"%>

<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
<%@ taglib uri="http://struts.apache.org/tags-tiles" prefix="tiles" %>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html:html lang="true">
  <head>
    <html:base />
    
    <title>EPhotoDis.jsp</title>

 <meta http-equiv="pragma" content="no-cache">
 <meta http-equiv="cache-control" content="no-cache">
 <meta http-equiv="expires" content="0">    
 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
 <meta http-equiv="description" content="This is my page">
 <!--
 <link rel="stylesheet" type="text/css" href="styles.css">
 -->

  </head>
  
  <body>

<%
 // Create image
 String username,password,url;
 Connection conn = null;
 Statement stmt = null;
 BufferedInputStream inputimage=null;
 username="dzjc";
 password="dzjc";
 url ="jdbc:oracle:thin:@192.168.1.134:1521:zhpt";
 Class.forName("oracle.jdbc.driver.OracleDriver");
 conn=DriverManager.getConnection(url,username,password);
 stmt=conn.createStatement();
 
 boolean defaultCommit = conn.getAutoCommit();
 conn.setAutoCommit(false);
 
 try 
 {
 
  ResultSet rs = stmt.executeQuery("SELECT img FROM dzjc_img");
 
  while (rs.next()) 
  {
   oracle.sql.BLOB blob = (oracle.sql.BLOB)rs.getBlob("img");
   inputimage = new BufferedInputStream(blob.getBinaryStream());
  }
 } 
 catch (Exception ex) 
 {
  System.out.println("blobRead()'s exception"+ex);
  conn.rollback();
  throw ex;
 }
 conn.setAutoCommit(defaultCommit);
 
 // Send back image
 BufferedImage image = null;
 try
 {
  image = ImageIO.read(inputimage);
 }
 catch(IOException e)
 {
  System.out.println(e);
 }
 ServletOutputStream sos = response.getOutputStream();
 JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
 encoder.encode(image);
 inputimage.close();
 /*/**/
%>

  </body>
</html:html>

再来个在action里用的

Java代码

package struts.action;
import java.awt.image.BufferedImage;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class EnrolRushRedLightPhotoManagePhotoDisplayAction extends Action
{
public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request,HttpServletResponse response)
{
// Create image
String username,password,url;
Connection conn = null;
Statement stmt = null;
BufferedInputStream inputimage=null;
username="dzjc";
password="dzjc";
url ="jdbc:oracle:thin:@192.168.1.134:1521:zhpt";
try
{
Class.forName("oracle.jdbc.driver.OracleDriver");
try
{
conn=DriverManager.getConnection(url,username,password);
stmt=conn.createStatement();
boolean defaultCommit = conn.getAutoCommit();
conn.setAutoCommit(false);
ResultSet rs = stmt.executeQuery("SELECT img FROM dzjc_img");
while (rs.next())
{
oracle.sql.BLOB blob = (oracle.sql.BLOB)rs.getBlob("img");
inputimage = new BufferedInputStream(blob.getBinaryStream());
}
conn.setAutoCommit(defaultCommit);
}
catch (SQLException e)
{
e.printStackTrace();
System.out.println("blobRead()'s exception"+e);
try
{
conn.rollback();
throw e;
}
catch (SQLException e1)
{
e1.printStackTrace();
}
}
}
catch (ClassNotFoundException e1)
{
e1.printStackTrace();
}
// Send back image
BufferedImage image = null;
try
{
image = ImageIO.read(inputimage);
ServletOutputStream sos = response.getOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
encoder.encode(image);
inputimage.close();
}
catch(IOException e)
{
System.out.println(e);
}
return mapping.findForward("display");
}
}