从数据库中以jsp显示图像 [英] Displaying image in jsp from database
本文介绍了从数据库中以jsp显示图像的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
对于下面的代码，我用谷歌搜索了很多，但是以某种方式我无法弄清楚该错误..关于"img src"标签.
For the code below, i googled lots, but somehow i couldn't figure out the error.. with respect to "img src" tag.
可能存在愚蠢的错误，但是如果有人可以帮助我，那将是很棒的事情.
There might be silly mistake, but it would be great if someone could help me out.
我已将图像保存在图像文件夹中，该文件夹位于项目文件夹中...
数据库在图像"属性下具有图像网址...因此，我试图通过<%=rs.getString("image") %>从数据库中检索网址是否正确?
I have saved my images inside the image folder, which is placed inside the project folder...
the database has the image url under "image" attribute... so i am trying to retrieve the url from the database through <%=rs.getString("image") %> is that correct ?
<html>
<body>
<%@ page import="java.io.*"%>
<%@ page import="java.sql.*"%>
<%@ page import="com.mysql.*"%>
<%@ page import="java.util.*"%>
<%@ page import="java.text.*"%>
<%@ page import="javax.servlet.*"%>
<%@ page import="javax.servlet.http.*"%>
<%@ page import="javax.servlet.http.HttpSession"%>
<%@ page language="java"%>
<%@ page session="true"%>
<%@ page import="java.sql.*"%>
<%
Blob image = null;
Connection con = null;
Statement stmt = null;
ResultSet rs = null;
String iurl1=null;
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:portnumber/dbname","","");
stmt = con.createStatement();
rs = stmt.executeQuery("select * from tablename where id = 1");
}
catch (Exception e) {
out.println("DB problem");
return;
}
finally {
try {
rs.close();
stmt.close();
con.close();
}
catch (SQLException e) {
e.printStackTrace();
}
}
%>
<table border="2">
<tr><th>DISPLAYING IMAGE</th></tr>
<tr><td>Image 2</td></tr>
<tr>
<td>
<img src="<%=rs.getString("image") %>" width="500" height="500"/>
</td>
</tr>
</table>
</body>
</html>
推荐答案
在收到图像本身之前，您已经关闭了连接 将您的代码更改为
You have closed your connection before recieving the image itself Change your code to
<html>
<body>
<%@ page import="java.io.*"%>
<%@ page import="java.sql.*"%>
<%@ page import="com.mysql.*"%>
<%@ page import="java.util.*"%>
<%@ page import="java.text.*"%>
<%@ page import="javax.servlet.*"%>
<%@ page import="javax.servlet.http.*"%>
<%@ page import="javax.servlet.http.HttpSession"%>
<%@ page language="java"%>
<%@ page session="true"%>
<%@ page import="java.sql.*"%>
<%
Blob image = null;
Connection con = null;
Statement stmt = null;
ResultSet rs = null;
String iurl1=null;
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:portnumber/dbname","","");
stmt = con.createStatement();
rs = stmt.executeQuery("select * from tablename where id = 1");%>
<table border="2">
<tr><th>DISPLAYING IMAGE</th></tr>
<tr><td>Image 2</td></tr>
<tr><td>
<%while(rs.next()){%>
<img src="<%=rs.getString("image") %>" width="500" height="500"/>
<%}%>
</td></tr>
</table>
<%}
catch (Exception e) {
out.println("DB problem");
return;
}
finally {
try {
rs.close();
stmt.close();
con.close();
}
catch (SQLException e) {
e.printStackTrace();
}
}
%>
</body>
</html>
或者有更好的方法将其保存在变量中
Or else a better way save it in a variable
<html>
<body>
<%@ page import="java.io.*"%>
<%@ page import="java.sql.*"%>
<%@ page import="com.mysql.*"%>
<%@ page import="java.util.*"%>
<%@ page import="java.text.*"%>
<%@ page import="javax.servlet.*"%>
<%@ page import="javax.servlet.http.*"%>
<%@ page import="javax.servlet.http.HttpSession"%>
<%@ page language="java"%>
<%@ page session="true"%>
<%@ page import="java.sql.*"%>
<%
Blob image = null;
Connection con = null;
Statement stmt = null;
ResultSet rs = null;
String iurl1=null;
String image=null;
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:portnumber/dbname","","");
stmt = con.createStatement();
rs = stmt.executeQuery("select * from tablename where id = 1");
while(rs.next()){
image = rs.getString("image");
}
}
catch (Exception e) {
out.println("DB problem");
return;
}
finally {
try {
rs.close();
stmt.close();
con.close();
}
catch (SQLException e) {
e.printStackTrace();
}
}
%>
<table border="2">
<tr><th>DISPLAYING IMAGE</th></tr>
<tr><td>Image 2</td></tr>
<tr><td>
<img src="<%=image %>" width="500" height="500"/>
</td></tr>
</table>
</body>
</html>
这篇关于从数据库中以jsp显示图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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