A. java 如何下载文件
httpURLConnection conn;
conn.getInputStream;
再将这个stream 写到文件就可以了
B. 当今流行的java三大框架下载（struts2.0+hibernate+spring)官方地址
Struts2.0: http://apache.freelamp.com/struts/source/struts-2.0.11.2-src.zip
或者 http://dev.xiaonei.com/apache-mirror/struts/binaries/struts-2.0.12-all.zip
Hibernate3.3: http://nchc.dl.sourceforge.net/sourceforge/hibernate/hibernate-distribution-3.3.1.GA-dist.zip
Spring2.0: http://nchc.dl.sourceforge.net/sourceforge/springframework/spring-framework-2.0.8-with-dependencies.zip