1.在Eclipse中菜单help选项中选择install new software选项

2.在work with 栏中输入 Juno - http://download.eclipse.org/releases/juno

3.拉到后面选择Web, XML, Java EE and OSGi Enterprise Development选项，然后选择

　　Eclipse Java EE Developer Tools

　　Eclipse Java Web Developer Tools

　　Eclipse Web Developer Tools

　　Eclipse XML Editors and Tools

4.安装等待