Description: Mainly the realization of asynchronous call, the user will be able to submit prior to testing the existence of the username, use the DWR framework.
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File list (Check if you may need any files):
DwrDemo
.......\.classpath
.......\.mymetadata
.......\.project
.......\dwr.jar
.......\src
.......\...\com
.......\...\...\ebuji
.......\...\...\.....\dwr
.......\...\...\.....\...\user
.......\...\...\.....\...\....\dao
.......\...\...\.....\...\....\...\impl
.......\...\...\.....\...\....\...\....\UserDaoImpl.java
.......\...\...\.....\...\....\...\IUserDao.java
.......\...\...\.....\user
.......\...\...\.....\....\biz
.......\...\...\.....\....\...\impl
.......\...\...\.....\....\...\....\UserService.java
.......\...\...\.....\....\...\IUserService.java
.......\...\...\.....\util
.......\...\...\.....\....\Utils.java
.......\WebRoot
.......\.......\index.jsp
.......\.......\META-INF
.......\.......\........\MANIFEST.MF
.......\.......\WEB-INF
.......\.......\.......\classes
.......\.......\.......\.......\com
.......\.......\.......\.......\...\ebuji
.......\.......\.......\.......\...\.....\dwr
.......\.......\.......\.......\...\.....\...\user
.......\.......\.......\.......\...\.....\...\....\dao
.......\.......\.......\.......\...\.....\...\....\...\impl
.......\.......\.......\.......\...\.....\...\....\...\....\UserDaoImpl.class
.......\.......\.......\.......\...\.....\...\....\...\IUserDao.class
.......\.......\.......\.......\...\.....\user
.......\.......\.......\.......\...\.....\....\biz
.......\.......\.......\.......\...\.....\....\...\impl
.......\.......\.......\.......\...\.....\....\...\....\UserService.class
.......\.......\.......\.......\...\.....\....\...\IUserService.class
.......\.......\.......\.......\...\.....\util
.......\.......\.......\.......\...\.....\....\Utils.class
.......\.......\.......\dwr.xml
.......\.......\.......\lib
.......\.......\.......\web.xml
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