Java导出请求头

StringBuilder contentDispositionValue = new StringBuilder();
        contentDispositionValue.append("attachment; filename=")
                .append(percentEncodedFileName)
                .append(";")
                .append("filename*=")
                .append("utf-8''")
                .append(percentEncodedFileName);
        response.setHeader("Content-disposition", contentDispositionValue.toString());
        response.setHeader("Cache-Control","No-Cache");
String percentEncodedFileName = URLEncoder.encode(realFileName, StandardCharsets.UTF_8.toString());
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