Reason:
some characters cannot be mapped using "ISO-8859-1" character encoding. Either change the encoding or remove the characters which are not supported by the "ISO-8859-1" character encoding.
解决办法：
菜单->Window->Preferences->General->Content Types->Text->Java Properties File设置Default encoding,把ISO-8859-1改为UTF-8 or GBK or gb2312. 然后update.
虽然能保存,但还必须利用 native2ascii 来转换一下,不然输出还是乱码
在jdk1.5.0_06/bin目录中有一个命令：native2ascii.exe --> 工作这个命令可实现UTF-8码的转换, 也就是*.properties文件的中文转换