本文目录一览:
- 1、读取保存在数据库里的图片JSP页面显示无法显示图片
- 2、如何从数据库里把数据显示在JSP页面上
- 3、jsp图片插入数据库并读出页面
- 4、jsp中显示数据库中图片和文字
- 5、数据库中照片怎么在jsp中显示
读取保存在数据库里的图片JSP页面显示无法显示图片
我把你的代码稍微改造了下,我这边是可以显示图片的。代码如下:
数据库操作部分:
package com.database;
import java.io.InputStream;
import java.sql.*;
/**
* @作者 王建明
* @创建日期 13-10-7
* @创建时间 下午12:32
* @版本号 V 1.0
*/
public class DataBaseUtil {
public static InputStream getImageStreamFromDataBase() {
Connection conn = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn =
DriverManager.getConnection("jdbc:mysql://localhost/quickstart", "root", "123456");
Statement stmt = conn.createStatement();
String sql = "select book_image from tbl_book where id=1 ";
ResultSet rs = stmt.executeQuery(sql);
if (rs.next()) {
return rs.getBinaryStream("book_image");
}
} catch (Exception e) {
System.out.println("出现异常: " + e.getMessage());
} finally {
try {
if (conn != null)
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return null;
}
}
servlet部分:
package com.servlet;
import com.database.DataBaseUtil;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* @作者 王建明
* @创建日期 13-10-7
* @创建时间 下午12:18
* @版本号 V 1.0
*/
public class ShowImage extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
InputStream in = DataBaseUtil.getImageStreamFromDataBase();
OutputStream toClient = response.getOutputStream();
response.reset();
response.setContentType("image/jpg");//或gif
int len = 10*1024*1024;
byte[] P_Buf = new byte[len];
int i;
while((i = in.read(P_Buf)) != -1){
toClient.write(P_Buf, 0, i);
}
in.close();
toClient.flush();
toClient.close();
}
}
web.xml中的servlet配置:
servlet
servlet-nameShowImage/servlet-name
servlet-classcom.servlet.ShowImage/servlet-class
/servlet
servlet-mapping
servlet-nameShowImage/servlet-name
url-pattern/showImage/url-pattern
/servlet-mapping
页面中加载图片方式:
img src="showImage" /
希望对你有帮助O(∩_∩)O~
如何从数据库里把数据显示在JSP页面上
把数据库的数据保存在response、session、application,然后在页面使用struts标签、jsp标签等显示,或者用%。
对于你的这个问题,建议你学一下系统的javaee体系,应为把数据读到页面不是那么简单的,需要jdbc链接数据库,需要一个tomcat服务器,需要数据库jar包、、、、、、
jsp图片插入数据库并读出页面
2008-11-02 15:321.序
数据库应用程序,特别是基于WEB的数据库应用程序,常会涉及到图片信息的存储和显示。
通常我们使用的方法是将所要显示的图片存在特定的目录下,在数据库中保存相应的图片的名称,在JSP中建立相应的数据源,利用数据库访问技术处理图片信息。但是,如果我们想动态的显示图片,上述方法就不能满足需要了。我们必须把图片存入数据库,然后通过编程动态地显示我们需要的图片。实际操作中,可以利用JSP的编程模式来实现图片的数据库存储和显示。
2. 建立后台数据库
if exists (select * from dbo.sysobjects
where id = object_id(N'[dbo].[p]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[p]
GO
CREATE TABLE [dbo].[p] (
[picid] [int] IDENTITY (1, 1) NOT NULL ,
[picname] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
[pic] [image] NULL
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
3.向数据库存储二进制图片
启动Dreamweaver MX后,新建一个JSP文件。其代码如下所示。
%@ page contentType="text/html;charset=gb2312"%
%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()
+":"+request.getServerPort()+path+"/";
%
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html
head
base href="%=basePath%"
titleMy JSP 'InputImage.jsp' starting page/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
form action="testimage.jsp" method="POST"br
题目input name="picname" type="text"br
图片input name="pic" type="file"br
input type="Submit" name="button1" value="提交"br
/form
/body
/html
将此文件保存为InputImage.jsp文件,其中testimage.jsp文件是用来将图片数据存入数据库的,具体代码如下所示:
%@ page contentType="text/html;charset=gb2312"%
%@ page import="java.sql.*" %
%@ page import="java.util.*"%
%@ page import="java.text.*"%
%@ page import="java.io.*"%
jsp:useBean id="conn" scope="page" class="dbconn.DBResult"/
%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+
":"+request.getServerPort()+path+"/";
%
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html
head
base href="%=basePath%"
titleMy JSP 'testimage.jsp' starting page/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
%
request.setCharacterEncoding("gb2312");
//建立Statement对象
String picname=request.getParameter("picname");
String pic=request.getParameter("pic");
//获得所要显示图片的标题、存储路径、内容,并进行中文编码
FileInputStream str=new FileInputStream(pic);
String sql="insert into p(picname,pic) values(?,?)";
PreparedStatement pstmt=conn.getPreparedStatement(sql);
pstmt.setString(1,picname);
pstmt.setBinaryStream(2,str,str.available());
pstmt.execute();
//将数据存入数据库
out.println("Success,You Have Insert an Image Successfully");
%
/body
/html
4. 网页中动态显示图片
接下来我们要编程从数据库中取出图片,其代码如下所示。
%@ page contentType="text/html;charset=gb2312"%
%@ page import="java.sql.*" %
%@ page import="java.util.*"%
%@ page import="java.text.*"%
%@ page import="java.io.*"%
jsp:useBean id="conn" scope="page" class="dbconn.DBResult"/
%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+
":"+request.getServerPort()+path+"/";
%
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html
head
base href="%=basePath%"
titleMy JSP 'testimageout.jsp' starting page/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
%
int id= Integer.parseInt(request.getParameter("picid"));
String sql = "select pic from p WHERE picid="+id;
ResultSet rs=conn.getResult(sql);
while(rs.next())
{
ServletOutputStream sout = response.getOutputStream();
//图片输出的输出流
InputStream in = rs.getBinaryStream(1);
byte b[] = new byte[0x7a120];
for(int i = in.read(b); i != -1;)
{
sout.write(b);
//将缓冲区的输入输出到页面
in.read(b);
}
sout.flush();
//输入完毕,清除缓冲
sout.close();
}
%
/body
/html
将此文件保存为testimageout.jsp文件。下一步要做的工作就是使用HTML标记:
%@ page contentType="text/html;charset=gb2312"%
%@ page import="java.sql.*" %
%@ page import="java.util.*"%
%@ page import="java.text.*"%
%@ page import="java.io.*"%
jsp:useBean id="conn" scope="page" class="dbconn.DBResult"/
%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+
":"+request.getServerPort()+path+"/";
%
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html
head
base href="%=basePath%"
titleMy JSP 'lookpic.jsp' starting page/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
%
String sql = "select * from p";
ResultSet rs=conn.getResult(sql);
while(rs.next())
{
%
ccid_file values="testimageout" % /" width="100" height="100"
br
%
}
rs.close();
%
/body
/html
版权归原版所有!!!
jsp中显示数据库中图片和文字
可以提前把图片和文字写好放在页面中,属性设为隐藏,调用的时候用js控制,把属性改为显示就行
数据库中照片怎么在jsp中显示
用JSP从数据库中读取图片并显示在网页上:
环境mysql+tomcat:
1先在mysql下建立如下的table. 并insert图像
mysql.sql文件如下:
CREATE TABLE photo (
photo_no int(6) unsigned NOT NULL auto_increment,
image blob,
PRIMARY KEY (`photo_no`)
)
2把show.jsp放在tomcat的任意目录下. show.jsp作用:从数据库中读出blob,并产生image/jpg.
show.jsp文件如下:
%@ page contentType="text/html; charset=gbk" %
%@ page import="java.io.*"%
%@ page import="java.sql.*, javax.sql.*" %
%@ page import="java.util.*"%
%@ page import="java.math.*"%
%
String photo_no = request.getParameter("photo_no");
//mysql连接
Class.forName("com.mysql.jdbc.Driver").newInstance();
String URL="jdbc:mysql://localhost:3306/job?user=rootpassword=111111";
Connection con = DriverManager.getConnection(URL);
//oracle连接
//String URL="jdbc:oracle:thin@localhost:1521:orcl2";
//user="system";
//password="manager";
//Connection con = DriverManager.getConnection(URL,user,password);
try{
// 准备语句执行对象
Statement stmt = con.createStatement();
String sql = " SELECT * FROM PHOTO WHERE photo_no = "+ photo_no;
ResultSet rs = stmt.executeQuery(sql);
if (rs.next()) {
Blob b = rs.getBlob("photo_image");
long size = b.length();
//out.print(size);
byte[] bs = b.getBytes(1, (int)size);
response.setContentType("image/jpeg");
OutputStream outs = response.getOutputStream();
outs.write(bs);
outs.flush();
rs.close();
}
else {
rs.close();
response.sendRedirect("./images/error.gif");
}
}
finally{
con.close();
}
%
3把如下文件放在show.jsp的同一目录下.
index.html文件如下:
HTML
HEAD
TITLE 图像测试 /TITLE
/HEAD
BODY
TABLE
TR
TD图像测试/TD
/TR
TR
TDimg src="show.jsp?photo_no=2"/TD
/TR
/TABLE
/BODY
/HTML