发现搜到的全部一样的方案 new String(fileName.getBytes(), "ISO8859-1")
贴一个不一样的解决方案
使用URLEncoder.encode
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String attachName = "这是中文名称文件.txt"//<a href="https://www.cnblogs.com/tomcatandjerry/p/11541871.html">https://www.cnblogs.com/tomcatandjerry/p/11541871.html</a>
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response.setCharacterEncoding("utf-8");
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(attachName, "UTF-8"));
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