Question

我正在编写一个应用程序，以接受来自Json文件的输入并对它进行排序。我有一个函数，该函数接受JsonObjects的已排序ArrayList并将它们写入到临时文件中（稍后在外部合并排序中使用）。我遇到的问题是，当JsonGenerator将最终的JsonObject写入文件时，它会在输出期间突然退出，从而使文件未完成且无法使用。

我尝试启用漂亮的打印，更改示例文件的大小，再次检查JsonObjects的ArrayList中的数据是否正确。没事。

这是有问题的函数：

public void writeTempDataToFile(ArrayList<JsonObject> jsobs, File file){
        try {
            FileOutputStream fos = new FileOutputStream(file);
            JsonGeneratorFactory jsonGeneratorFactory = Json.createGeneratorFactory(Collections.singletonMap(JsonGenerator.PRETTY_PRINTING, true));
            JsonGenerator jWrite = jsonGeneratorFactory.createGenerator(fos);
            jWrite.writeStartObject();
            jWrite.writeStartArray("results");
            for(JsonObject jsob : jsobs){
                jWrite.writeStartObject();
                jsob.forEach((key, value) -> {
                    jWrite.write(key, value);
                });
                jWrite.writeEnd();
            }
            jWrite.writeEnd();
            jWrite.writeEnd();
            fos.close();

        } catch (Exception ex) {System.out.println(ex);}

    }

这是我稍后在执行外部合并排序期间读取不完整的JsonObject时收到的错误消息。错误期间执行的操作是将不完整的JsonObject添加到

的ArrayList中

JsonObjects. 
javax.json.stream.JsonParsingException: Invalid token=EOF at (line no=411011, column no=7671, offset=19889551). Expected tokens are: [STRING]

这是输出的样本。第一个JsonObject是它的外观，第二个是要写入的最终对象，它显示了输出突然停止的位置。

{
            "classification": "Class II",
            "center_classification_date": "20121025",
            "report_date": "20121031",
            "postal_code": "08816-2108",
            "termination_date": "20141007",
            "recall_initiation_date": "20120904",
            "recall_number": "D-031-2013",
            "city": "East Brunswick",
            "event_id": "63384",
            "distribution_pattern": "Nationwide",
            "openfda": {
            },
            "recalling_firm": "Raritan Pharmaceuticals, Inc.",
            "voluntary_mandated": "Voluntary: Firm Initiated",
            "state": "NJ",
            "reason_for_recall": "Microbial Contamination of Non-Sterile Products: Product is being recalled due to possible microbial contamination by C. difficile discovered in the raw material.",
            "initial_firm_notification": "E-Mail",
            "status": "Terminated",
            "product_type": "Drugs",
            "country": "United States",
            "product_description": "Premier Value Fiber Plus Calcium Supplement Capsules, 120 capsules per bottle, Distributed by: Chain Drug Consortium, LLC, Boca Raton, FL, UPC 8-40986-01987-6",
            "code_info": "Lot 15087, Exp 08/15",
            "address_1": "8 Joanna Ct",
            "address_2": "",
            "product_quantity": "96 bottles"
        },
        {
            "classification": "Class II",
            "center_classification_date": "20121025",
            "report_date": "20121031",
            "postal_code": "08816-2108",
            "termination_date": "20141007",
            "recall_initiation_date": "20120904",
            "recall_number": "D-026-2013",
            "city": "East Brunswick",
            "event_id": "63384",
            "distribution_pattern": "Nationwide",
            "openfda": {
            },
            "recalling_firm": "Raritan Pharmaceuticals, Inc.",
            "voluntary_mandated": "Volun

我希望输出是一个完整的Json文件，且所有括号都闭合。

Answer 1

您需要在关闭FileOutputStream之前关闭JsonGenerator（很可能是使用需要刷新的内部字符缓冲区）。

当接近文件结尾时，javax.json.stream.JsonGenerator突然结束输出

1 个答案: