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上面只能 预览world文档,如果要预览其它格式的文档,自己加判断,然后设置头信息。if(".DOC" .equals(extName)){response.setHeader("Content-type", "application/msword");} else if(".DOCX" .equals(extName)){response.setHeader("Content-type","application/vnd.openxmlformats-officedocument.wordprocessingml.document");} else if(".PDF" .equals(extName)){response.setHeader("Content-type","application/pdf");} else if(".TXT" .equals(extName)){response.setHeader("Content-type","text/html");} else if(".XLS" .equals(extName)){response.setHeader("Content-type","application/vnd.ms-excel");} else if(".XLSX" .equals(extName)){response.setHeader("Content-type","application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");} else if(".PPT" .equals(extName)){response.setHeader("Content-type","application/vnd.ms-powerpoint");} else if(".PPTX" .equals(extName)){response.setHeader("Content-type","application/vnd.openxmlformats-officedocument.presentationml.presentation");} else if(".BMP" .equals(extName)){response.setHeader("Content-type","image/bmp");} else if(".GIF" .equals(extName)){response.setHeader("Content-type","image/gif");} else if(".IEF" .equals(extName)){response.setHeader("Content-type","image/ief");} else if(".JPEG" .equals(extName)){response.setHeader("Content-type","image/jpeg");} else if(".JPG" .equals(extName)){response.setHeader("Content-type","image/jpeg");} else if(".PNG" .equals(extName)){response.setHeader("Content-type","image/png");} else if(".TIFF" .equals(extName)){response.setHeader("Content-type","image/tiff");} else if(".TIF" .equals(extName)){response.setHeader("Content-type","image/tif");