MongoDB Document field names can't have a . in them
在用JAVA往MongoDB里面插入数据时，当以域名作为field的时，报如下错误：
java.lang.IllegalArgumentException: Document field names can't have a . in them
查找了一些资料（见文末）之后，发现解决办法如下：
if (tag.contains(".")) {
tagsInfo.put(tag.replace(".", "\\u002e"), "1");
} else {
tagsInfo.put(tag, "1");
}
参考资料：
0.http://stackoverflow.com/questions/8429318/how-to-use-dot-in-field-name 1.http://docs.mongodb.org/manual/core/document/#dot-notation 2.http://docs.mongodb.org/manual/faq/developers/#faq-dollar-sign-escaping 3.http://www.fileformat.info/info/unicode/char/2e/index.htm
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