提问：附件在线预览如何实现？附件在线预览怎么配置？上传的附件支持在线预览吗？
答复：附件预览支持的格式有doc，jpg，png，jpeg，bmp，xlsx，xls，docx，pdf；
开启预览的设置在emap配置文件中，增加如下配置项：
文档预览地址
lwpub.preview.url=http://newres.wisedu.com/fileview/onlinePreview
#上传2.0是否增加文档预览，true或false
lwpub.preview.open=true
#文档预览格式
lwpub.preview,type=doc,docx,xls.xlsx,pdf
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