play2上传下载文件

一、下载文件。直接一行代码代码搞定：

  ok(new File("test.xlsx"));

完整的类代码如下：

public class Export extends Controller {

    public static Result excel(String filename){
        Configuration conf = play.Play.application().configuration();
        String tmpPath = conf.getString("tmp.path");
        return ok(new File(tmpPath + "/" + filename+ ".xlsx"));
    }
}

二、上传文件
前端代码：

<form method="POST" enctype="multipart/form-data" action="/upload">
  File to upload: <input type="file" name="file"><br/>
  <br/>
  <input type="submit" value="Press"> to upload the file!
</form>

后端代码：

public static Result upload() {
  MultipartFormData body = request().body().asMultipartFormData();
  FilePart filePart = body.getFile("file");
  String fileName = picture.getFilename();
  String contentType = picture.getContentType(); 
  File file = picture.getFile();
}