eclipse无法连接到makertplace

Eclipse需要安装一个Jcoco的插件，但是连接Eclipse Market的时候，总是出现如下的报错：

Cannot open Eclipse Marketplace
Cannot install remote marketplace locations: Connection failed

This is most often caused by a problem with your internet connection. Please check your internet connection and retry.
Cannot complete request to http://marketplace.eclipse.org/catalogs/api/p: Unable to connect to repository http://marketplace.eclipse.org/catalogs/api/p
Unable to connect to repository http://marketplace.eclipse.org/catalogs/api/p
Connection to http://marketplace.eclipse.org refused
Connection failed

This is most often caused by a problem with your internet connection. Please check your internet connection and retry.
Connection to http://marketplace.eclipse.org refused 

解决方案：

　　1、修改eclipse.ini文件，在文件末尾添加如下内容：

-Djava.net.preferIPv4Stack=true

　　2、通过安装插件的方式，手动添加Eclipse Market

　　点击 help->Install new SoftWare->add

　　输入插件名：Market Client

　　输入路径：http://download.eclipse.org/mpc/indigo/

　　添加完成后，选择Eclipse Marketplace Client,下载安装即可。