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Created by zhidao on January 25, 2012 19:27:53
Last update: January 25, 2012 19:28:47
The spring MVC annotation-driven declaration:
<?xml version="1.0" encoding="UTF-8"?> <beans x... does the following magic : Among others, registers: RequestMappingHandlerMapping RequestMappingHandlerAdapter ExceptionHandlerExceptionResolver in support of processing requests with annotated controller methods using annotations such as @RequestMapping , @ExceptionHandler , etc. Enables Spring 3 style type conversion through a ConversionService instance in addition to the JavaBeans PropertyEditors used for Data Binding. Enables support for formatting Number fields using the @NumberFormat annotation through the ConversionService . Enables support for formatting Date, Calendar, Long, and Joda Time fields using the @DateTimeFormat annotation, if Joda Time 1.3 or higher is present on the classpath. Enables support for validating @Controller inputs with @Valid , if a JSR-303 Provider is present on the classpath. Enables HttpMessageConverter support for @RequestBody method parameters and...
Created by Dr. Xi on March 30, 2011 13:43:05
Last update: March 30, 2011 13:45:27
Method 1 - use javap with verbose flag:
$ javap HelloWorld -verbose | head
Compiled fro...
Method 2 - use a utility class:
import java.io.*;
import java.nio.ByteBuffer;
...
According to the VM Spec , a Java class file has this structure:
ClassFile {
u4 magic;
...
Created by Dr. Xi on March 02, 2011 11:39:18
Last update: March 09, 2011 12:19:30
Some peculiarities about Java PrintWriter: PrintWriter never throws any exceptions. From JavaDoc : Methods in this class never throw I/O exceptions, although some of its constructors may. The client may inquire as to whether any errors have occurred by invoking checkError(). When error occurs, you'll never know anything more than that it occured, because checkError returns boolean. When a character is out of the range of the character encoding of the PrintWriter, it prints a question mark (?). But this is not an error. Test code:
import java.io.*; public class TestPrintWri... Latin1 test result: java TestPrintWriter iso-8859-1 | od -bc 000000... UTF-8 test result: java TestPrintWriter utf-8 | od -bc 0000000 141... Also, the constructor throws a FileNotFoundException when you try to write to a...
Created by James on October 11, 2010 19:01:28
Last update: January 11, 2011 20:38:56
Test page (click the "new window" icon to see the transition):
<!DOCTYPE html>
<html>
<head>
<title>jQu...
Created by James on October 11, 2010 18:14:41
Last update: January 11, 2011 20:36:01
Test page:
<!DOCTYPE html>
<html>
<head>
<title>jQu...
Documentation:
UI/Effects - jQuery JavaScript Library
Effects - jQueryAPI
Created by voodoo on November 25, 2010 00:03:53
Last update: November 25, 2010 00:03:53
It seems that the JDBC standard way to create a BLOB is to call Connection.createBlob . However, this does not work for PostgreSQL (as of version 9.0-801 jdbc4):
Exception in thread "main" org.postgresql.util.PSQ...
The workaround is to call a PostgreSQL function to create the Blob, then use JDBC to update it:
Connection conn = jdbcTemplate.getDataSource().get...
Oracle Note: the Oracle way function to create an empty BLOB is EMPTY_BLOB() .
stmt.execute ("INSERT INTO my_blob_table VALUES ('...
Created by James on September 10, 2010 23:01:14
Last update: September 10, 2010 23:01:14
By default, heights for jQuery UI tab panels expand or contract depending on the height of each tab. The code snippet here sets the height of all tabs to be equal to that of the container.
<!DOCTYPE html>
<html>
<head>
<title>jQu...
Created by voodoo on July 11, 2009 15:14:55
Last update: July 29, 2010 22:45:48
cURL is a command line tool for transferring files with URL syntax. The main purpose and use for cURL is to automate unattended file transfers or sequences of operations.
It's really easy to see HTTP headers with curl:
C:\>curl --head http://www.google.com
HTTP/1.0 ...
or, headers and page together (dump headers to stdout):
$ curl --dump-header - http://www.google.com HTTP/...
Download openssl from openssl.org:
curl http://www.openssl.org/source/openssl-0.9.6m....
C:\>curl --help
Usage: curl [options...] <url>
...
Created by Dr. Xi on January 29, 2010 23:40:11
Last update: January 29, 2010 23:40:11
Load from specified PATH
// import java.util.Properties
Properties p...
Load from CLASSPATH
Properties p = new Properties();
// Loa...
Write Properties object to a file
// Write properties file.
out = new FileOut...
Created by Dr. Xi on January 08, 2010 03:53:37
Last update: January 08, 2010 03:54:56
This is an Ant custom task to merge Properties files I lifted from http://marc.info/?l=ant-user&m=106442688632164&w=2 , with some minor bug fixes.
Example usage:
<taskdef name="mergeProperty" classname="ant.task....
Implementation:
package ant.task.addon;
import java.io.Buff...
Created by Dr. Xi on February 09, 2009 23:14:15
Last update: February 09, 2009 23:14:15
This example demonstrates the general steps in creating a custom Java class loader. Normally a class loader would consult its parent class loader when asked to load a class. If it's not loaded by the parent class loader, then the class loader would try to load the class on its own. This class loader tries to load the requested class on its own first, and delegates to the parent only when a java.lang.SecurityException is thrown (which happens when it tries to load core Java classes such as java.lang.String ). The classes are loaded from CLASSPATH through the getResourceAsStream call. It's important to note that when a class is loaded with a certain class loader, all classes referenced from that class are also loaded through the...
Created by Dr. Xi on September 05, 2008 22:58:01
Last update: September 07, 2008 03:25:24
Java introduced annotations since JDK1.5. Annotations are used to decorate code and can be applied to declarations of classes, fields, methods, and other program elements. They are not part of the code per se, but frequently used to apply external logic to the code being annotated. An "Annotation Type" must accompany each type of annotation. For example, the following code will fail compilation:
public class TestAnnotation { @deprecated ... Changing @deprecated to @Deprecated with an upper case D will fix the problem, since @Deprecated is a built in annotation type. There are three built in annotation types: @Deprecated , @Override , and @SuppressWarnings . This is an example of a user defined annotation (the file must be named Test.java ): import java.lang.annotation.*; /** * In......
