play2 export file from mongodb

play2 export file from mongodb

(play framework2 从mongdb中直接读取文件字节)不废话,直接上代码

字节来源需要注意:
(1)guava方法:

import com.google.common.io.ByteStreams;
byte[] content = ByteStreams.toByteArray(new FileInputStream(path));

(2)apache方法(未亲测):

import org.apache.commons.io.IOUtils;
byte[] content =  IOUtils.toByteArray(new FileInputStream(path));

action:

public Result getFile(String id){
        models.File file = models.File.find().byId(id);
        byte[] content = file.content;
        InputStream input =  new ByteArrayInputStream(content);
        return ok(input).as("image/png");
    }

扔个参考:

  • Displaying image object from controller in the browser

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