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问题描述:
项目通过java接口来下载文件,发现下载office文件时,打开都不正常,比如下载office文件打开会报“word在 XX.docx 发现无法读取的内容。是否恢复此文档的内容”。但如果通过nginx映射来下载,可以正常打开。
解决方法:
研究后发现,是因为没有设置Content-Type,其实每种office文件都有对应的Content-Type。可参考:https://www.jianshu/p/4b09c260f9b2?from=groupmessage
修改后的代码如下:
private final static Map<String, String> CONTENT_TYPE_MAP = new HashMap<>();
static {
CONTENT_TYPE_MAP.put("doc", "application/msword");
CONTENT_TYPE_MAP.put("dot", "application/msword");
CONTENT_TYPE_MAP.put("docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document");
CONTENT_TYPE_MAP.put("dotx", "application/vnd.openxmlformats-officedocument.wordprocessingml.template");
CONTENT_TYPE_MAP.put("docm", "application/vnd.ms-word.document.macroEnabled.12");
CONTENT_TYPE_MAP.put("dotm", "application/vnd.ms-word.template.macroEnabled.12");
CONTENT_TYPE_MAP.put("xls", "application/vnd.ms-excel");
CONTENT_TYPE_MAP.put("xlt", "application/vnd.ms-excel");
CONTENT_TYPE_MAP.put("xla", "application/vnd.ms-excel");
CONTENT_TYPE_MAP.put("xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
CONTENT_TYPE_MAP.put("xltx", "application/vnd.openxmlformats-officedocument.spreadsheetml.template");
CONTENT_TYPE_MAP.put("xlsm", "application/vnd.ms-excel.sheet.macroEnabled.12");
CONTENT_TYPE_MAP.put("xltm", "application/vnd.ms-excel.template.macroEnabled.12");
CONTENT_TYPE_MAP.put("xlam", "application/vnd.ms-excel.addin.macroEnabled.12");
CONTENT_TYPE_MAP.put("xlsb", "application/vnd.ms-excel.sheet.binary.macroEnabled.12");
CONTENT_TYPE_MAP.put("ppt", "application/vnd.ms-powerpoint");
CONTENT_TYPE_MAP.put("pot", "application/vnd.ms-powerpoint");
CONTENT_TYPE_MAP.put("pps", "application/vnd.ms-powerpoint");
CONTENT_TYPE_MAP.put("ppa", "application/vnd.ms-powerpoint");
CONTENT_TYPE_MAP.put("pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation");
CONTENT_TYPE_MAP.put("potx", "application/vnd.openxmlformats-officedocument.presentationml.template");
CONTENT_TYPE_MAP.put("ppsx", "application/vnd.openxmlformats-officedocument.presentationml.slideshow");
CONTENT_TYPE_MAP.put("ppam", "application/vnd.ms-powerpoint.addin.macroEnabled.12");
CONTENT_TYPE_MAP.put("pptm", "application/vnd.ms-powerpoint.presentation.macroEnabled.12");
CONTENT_TYPE_MAP.put("potm", "application/vnd.ms-powerpoint.presentation.macroEnabled.12");
CONTENT_TYPE_MAP.put("ppsm", "application/vnd.ms-powerpoint.slideshow.macroEnabled.12");
}
@ApiOperation(value = "文件下载接口", httpMethod = "GET", notes = "文件下载接口")
@RequestMapping("/downloadFiles/{md5}.{format}")
@ResponseBody
public AjaxResult downloadFiles(HttpServletResponse response,
@PathVariable String md5, @PathVariable String format){
File file = new File(this.getFilePath()+md5+".data");
if(!file.exists()) {
return getResult(1, "文件不存在");
}
try(
FileInputStream fileInput = new FileInputStream(file);
BufferedInputStream bufferedInput = new BufferedInputStream(fileInput);
) {
response.setHeader("Accept-Ranges", "bytes");
response.setHeader("Content-Length", file.length()+"");
response.setHeader("Content-Type", CONTENT_TYPE_MAP.get(format));
response.setDateHeader("Last-Modified", file.lastModified());
response.setCharacterEncoding(null); // 设置为null,否则Content-Type会带上charset=UTF-8
byte[] buffer = new byte[1024];
OutputStream os = response.getOutputStream();
int len = 0;
while ((len = bufferedInput.read(buffer)) > 0) {
os.write(buffer, 0, len);
}
} catch (Exception e) {
e.printStackTrace();
}
return getResult(0, null);
}
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