Eclipse打包为jar的两种方法

转自：http://blog.csdn.net/tobetheender/article/details/52670732

注意：安装插件报错(Warning: You are installing software that contains unsigned content.The authenticity or validity of this software cannot be established. Do you want to continue with the installation?)
出现这样的情况，只能把你要安装的插件手动下载下来，然后解压，把里面的文件拷贝进eclipse中的plugins中，最后重启eclipse，插件就成功安装啦！！！