Play的动作可以返回文件：
response().setContentType("application/x-download"); response().setHeader("Content-disposition","attachment; filename=tradeLogTest.xlsx"); return ok(new File("/absolute/path/to/tradeLogTest.xlsx"));这是结果的API
Play的动作可以返回文件：
response().setContentType("application/x-download"); response().setHeader("Content-disposition","attachment; filename=tradeLogTest.xlsx"); return ok(new File("/absolute/path/to/tradeLogTest.xlsx"));这是结果的API
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