非常实现的验证码功能，可以用到项目中去，该源代码无jar包，没有有JavaScript，纯JAVAWEB代码，jsp页面，serlvet显示，简单易懂试用
资源文件列表
One/.project , 1036
One/.settings/.jsdtscope , 503
One/.settings/org.eclipse.jdt.core.prefs , 364
One/.settings/org.eclipse.wst.common.component , 461
One/.settings/org.eclipse.wst.common.project.facet.core.xml , 305
One/.settings/org.eclipse.wst.jsdt.ui.superType.container , 49
One/.settings/org.eclipse.wst.jsdt.ui.superType.name , 6
One/build/classes/com/jy/servlet/CheckCodeServlet.class , 2998
One/build/classes/com/jy/servlet/RegisterServlet.class , 2161
One/src/com/jy/servlet/CheckCodeServlet.java , 2339
One/src/com/jy/servlet/RegisterServlet.java , 1311
One/WebContent/META-INF/MANIFEST.MF , 39
One/WebContent/reg.jsp , 1204
One/WebContent/WEB-INF/web.xml , 1248