JAVA在线API

http://java.sun.com/reference/api/
JavaTM Platform Enterprise Edition, v 5.0
http://java.sun.com/javaee/5/docs/api/
1.Hibernate API Documentation (3.2.2.ga)
http://www.hibernate.org/hib_docs/v3/api/
2.Spring Framework API 2.5
http://static.springframework.org/spring/docs/2.5.x/api/index.html
3.Struts 1.3.8 API
http://struts.apache.org/1.3.8/apidocs/index.html
4.Struts 2 Core 2.0.11.1 API
http://struts.apache.org/2.0.11.1/struts2-core/apidocs/index.html
5.ajax4jsf:JSF的Ajax框架
http://www.jboss.org/file-access/default/members/jbossrichfaces/freezone/docs/apidoc_framework/index.html
6.JBoss API
http://docs.jboss.org/jbossas/javadoc/4.0.5/
7.OSGI R4
http://docs.huihoo.com/javadoc/osgi/r4/
8.JBoss Seam
http://docs.jboss.com/seam/2.1.0.A1/api/
9.Seam JSF Controls 2.1.0.A1 API
http://docs.jboss.com/seam/2.1.0.A1/ui/apidocs/
10.ROR
http://docs.huihoo.com/api/ruby-on-rails/
11.Ruby1.8.4
http://docs.huihoo.com/api/ruby/core/1.8.4/
12.Ruby Stdlib
http://docs.huihoo.com/api/ruby/stdlib/0.10.1/
13.JBPM/BPEL1.1
http://docs.jboss.com/jbpm/bpel/v1.1/javadoc/
14.Groovy JDK API Specification
This document describes the methods added to the JDK to make it more groovy.
http://groovy.codehaus.org/groovy-jdk/
15.Groovy (1.6-beta-1) API
http://groovy.codehaus.org/api/index.html
16.Groovy 1.5 API
http://groovy.codehaus.org/gapi/
17.Grails1.0 API
http://grails.org/doc/1.0.x/api/
18.在线JDK6 API:
http://gceclub.sun.com.cn/Java_Docs/jdk6/html/zh_CN/api/index.html
下载地址:
http://java.sun.com/javase/downloads/index.jsp
19.其他Java SE APIs & Documentation:
[url]
http://java.sun.com/javase/reference/api.jsp[/url]
20.在线Java API List:
http://java.sun.com/reference/api
21.JavaEE5 API(含JSF API)
http://java.sun.com/javaee/5/docs/api/
22.Ajax框架DWR API Doc
http://www.ajaxjs.com/docs/docs/
23.Google Maps API 2.0 参考文档
http://www.step1.cn/GoogleApi/map2/reference.htm