[Java] Returns a Japanese name file in filename of HTTP header

When I tried to download Japanese_1.tsv, it turned out to be _1.tsv. URL encoding is required to download in Japanese

Example of embedding in Spark response header

    Spark.res.header("Content-disposition", "attachment; filename=Japanese_1.tsv")

You need to encode this and embed it

    Spark.res.header("Content-disposition", "attachment; filename=" + URLEncoder.encode("Japanese_1.tsv", "UTF-8"))

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