以下是我的代碼：

InputStream inputStream = new FileInputStream(new File("mypdf.pdf"));try {byte[] fileByteStream = IOUtils.toByteArray(inputStream );String base64String = new String(Base64.getEncoder().encodeToString(fileByteStream).getBytes(),"UTF-8");String strEncoded = Base64.getEncoder().encodeToString( base64String.getBytes( "utf-8" ));this.stream.close();JSONObject correspondenceNode = new JSONObject(); correspondenceNode.put("data",strEncoded );String strSsonValues = correspondenceNode.toString();HttpEntity entity = new NStringEntity(strSsonValues , ContentType.APPLICATION_JSON);elasticrestClient.put("/2018/documents/"1, entity);} catch (IOException e) {e.printStackTrace();}

以下是解碼代碼：

String responseBody = elasticrestClient.get("/2018/documents/1"); //some code to fetch the hits JSONObject h = hitsArray.getJSONObject(0); source = h.getJSONObject("_source"); String object = (source.getString("data")); byte[] decodedStr = Base64.getDecoder().decode( object );FileOutputStream fos = new FileOutputStream("download.pdf"); fos.write(Base64.getDecoder().decode(new String( decodedStr, "utf-8" ))); fos.close();

用戶回答回答于?2018-08-02

提取文本和元數據，并將該URL指向二進制文件本身。

{"content": "Extracted text here","meta": {// Meta data there},"url": "file://path/to/file" }

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