Recent Notes
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Created by Dr. Xi on November 11, 2011 10:05:22
Last update: November 11, 2011 10:12:01
This is an HTML image tag filter using Java regex. It takes a string, finds the img tags, replaces the src attribute with one provided by the filter, then adds a class name to the class attribute.
import java.util.regex.*;
import java.io.*;
...
Test file:
<div id="HTML snippet">
<img src="img/big/txt-m...
Created by alfa on April 08, 2011 12:33:08
Last update: April 08, 2011 12:33:08
This example captures the screen of the current Java application window, instead of the full screen.
import java.io.*;
import java.awt.*;
import ...
Created by voodoo on November 24, 2010 23:43:29
Last update: November 24, 2010 23:43:29
Two of the three PreparedStatement.setBinaryStream methods are not implemented as of version 9.0-801 of the PostgreSQL JDBC driver.
Test program:
import java.io.*;
import java.sql.*;
pub...
Also note that setBinaryStream only works on a bytea column.
Created by Fang on April 01, 2010 22:24:58
Last update: April 02, 2010 02:49:38
In this note I'll show you how to create and package a JSP custom tag. The purpose of this tag is to display a random splash image for a home page, among a set of images. We should be able to add or delete candidate splash images from the WAR archive without the need to change the JSP. This is the intended use of the tag:
<%@ taglib uri="http://custom.tag.com/demo" prefix... In the above example you provide a set of images named splash*.png (e.g., splash1.png, spalsh2.png, ...), and the tag will pick a random one to display when the JSP is rendered. Let's get started. I'll use Maven for this purpose. Create the standard Maven directory structure ./pom.xml ./src ./src/main ./src/main/jav... pom.xml <project xmlns="http://maven.apache.org/POM/4.0.0"... SplashTag.java package tagdemo; import java.util.ArrayList......
Created by Dr. Xi on January 29, 2009 17:11:34
Last update: January 29, 2009 17:11:34
import java.awt.Color;
import java.awt.Font;
...
Created by Dr. Xi on October 18, 2008 02:59:57
Last update: October 18, 2008 02:59:57
Use java.sql.PreparedStatement to insert a BLOB or CLOB field:
void setAsciiStream(int parameterIndex, InputStream x, int length)
Sets the designated parameter to the given input stream, which will have the specified number of bytes.
void setBinaryStream(int parameterIndex, InputStream x, int length)
Sets the designated parameter to the given input stream, which will have the specified number of bytes.
void setCharacterStream(int parameterIndex, Reader reader, int length)
Sets the designated parameter to the given Reader object, which is the given number of characters long.
void setClob(int i, Clob x)
Sets the designated parameter to the given Clob object.
void setBlob(int i, Blob x)
Sets the designated parameter to the given Blob object.
Example code:
PreparedStatement pstmt = con.prepareStatement...
