Question

我正在尝试从file.my文件中拆分Json数据，其中包含一个包含20个对象的Json数组。我想将这20个对象分成20个不同的文件。我的代码可以工作并创建文件＆amp;我想将它们保存在不同的String对象中，文件中的数据是jumbling.Confused如何以正确的方式分割！
我的问题：

1）我的json合成文件。 json formate我在分割并写入文件

之后得到了

我的代码

import java.io.*;
import java.util.*;
import org.json.*;

public class JsonSpilt {





private static final int BATCH_SIZE = 10;

public static void flushFile(List<Object> objects, int d) throws Exception {
    try (FileOutputStream output = new FileOutputStream("/home/system5/Music/tweet-" + d
        + ".json");
            Writer writer = new OutputStreamWriter(output, "UTF-8")) {
        JSONArray jsonArray = new JSONArray(objects);
        jsonArray.write(writer);
    }
}

public static void main(String[] args) throws Exception {
    int outputIndex = 0;
    try (InputStream input = new BufferedInputStream(
            new FileInputStream("/home/system5/Videos/tweet.json"))) {
        JSONTokener tokener = new JSONTokener(input);
        if (tokener.nextClean() != '[') {
            throw tokener.syntaxError("Expected start of JSON array");
        }
        List<Object> jsonObjects = new ArrayList<>();
        while (tokener.nextClean() != ']') {

            tokener.back();

            jsonObjects.add(tokener.nextValue());

            if (jsonObjects.size() == BATCH_SIZE) {
                flushFile(jsonObjects, outputIndex);
                jsonObjects.clear();
                outputIndex++;
            }

            if (tokener.nextClean() != ',') {
                tokener.back();
            }
        }
        if (!jsonObjects.isEmpty()) {
            flushFile(jsonObjects, outputIndex);
        }
        // Verify that end of input is reached.
        if (tokener.nextClean() != 0) {
            throw tokener.syntaxError("Expected end of document");
        }
    }

}}

示例输入包含json数组中的两个对象。

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Answer 1

根据你的截图，一切看起来都很好。如果您担心JSON对象中的值序列，那么您不必担心。请参阅以下链接。 Does the sequence of the values matter in a JSON object?

Answer 2

你的代码看起来过于复杂......而且你不清楚你想如何分离对象？ 20到20个文件..每个文件是一个对象吗？你可以比这更容易做到：

public class Main {
    public static void main(String[] args) throws Exception {
        String filePath = "tweets.json";
        try (BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(filePath), "UTF-8"))) {
            JSONTokener tokener = new JSONTokener(reader);
            JSONArray a = new JSONArray(tokener);

            for (int i = 0; i < a.length(); ++i) {
                flushFile((JSONObject) a.get(i), i);
            }
        }
    }

    public static void flushFile(JSONObject obj, int d) throws Exception {
        try (FileOutputStream output = new FileOutputStream("/home/dzmitry/downloads/so-test/tweet-" + d + ".json");
             Writer writer = new OutputStreamWriter(output, "UTF-8")) {
            obj.write(writer);
        }
    }
}

将20个Json-Array对象拆分为spearte单数组json文件？

2 个答案: