Java 读取并附加到json文件

我有一个json文件，如下所示：

{
  "profiles": {
    "example1": {
      "name": "example1",
      "lastVersionId": "example1"
    },
    "example2": {
      "name": "example2",
      "lastVersionId": "example2",
      "playerUUID": "00000000000000000000000000000000"
    },
  },
  "selectedProfile": "example",
  "clientToken": "000000000000000000000000000",
  "authenticationDatabase": {
    "000000000000000000000000000": {
      "username": "example@gmail.com",
      "accessToken": "000000000000000000000000000",
      "userid": "000000000000000000000000000",
      "uuid": "000000000000000000000000000",
      "displayName": "example"
    }
  }
}

{
  "profiles": {
    "example1": {
      "name": "example1",
      "lastVersionId": "example1"
    },
    "example2": {
      "name": "example2",
      "lastVersionId": "example2",
      "playerUUID": "00000000000000000000000000000000"
    },
    "example3": {
      "name": "example3",
      "lastVersionId": "example3",
    },
  },
  "selectedProfile": "example",
  "clientToken": "000000000000000000000000000",
  "authenticationDatabase": {
    "000000000000000000000000000": {
      "username": "example@gmail.com",
      "accessToken": "000000000000000000000000000",
      "userid": "000000000000000000000000000",
      "uuid": "000000000000000000000000000",
      "displayName": "example"
    }
  }
}

我需要附加如下内容：

{
  "profiles": {
    "example1": {
      "name": "example1",
      "lastVersionId": "example1"
    },
    "example2": {
      "name": "example2",
      "lastVersionId": "example2",
      "playerUUID": "00000000000000000000000000000000"
    },
  },
  "selectedProfile": "example",
  "clientToken": "000000000000000000000000000",
  "authenticationDatabase": {
    "000000000000000000000000000": {
      "username": "example@gmail.com",
      "accessToken": "000000000000000000000000000",
      "userid": "000000000000000000000000000",
      "uuid": "000000000000000000000000000",
      "displayName": "example"
    }
  }
}

{
  "profiles": {
    "example1": {
      "name": "example1",
      "lastVersionId": "example1"
    },
    "example2": {
      "name": "example2",
      "lastVersionId": "example2",
      "playerUUID": "00000000000000000000000000000000"
    },
    "example3": {
      "name": "example3",
      "lastVersionId": "example3",
    },
  },
  "selectedProfile": "example",
  "clientToken": "000000000000000000000000000",
  "authenticationDatabase": {
    "000000000000000000000000000": {
      "username": "example@gmail.com",
      "accessToken": "000000000000000000000000000",
      "userid": "000000000000000000000000000",
      "uuid": "000000000000000000000000000",
      "displayName": "example"
    }
  }
}

所以基本上，我需要向文件中添加一个配置文件

package minecraftMPC;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

public class Profile {

    public static void main(String[] args) throws FileNotFoundException, IOException, ParseException {
        profileAppend("test", "exampleName");
    }

    @SuppressWarnings("unchecked")
    public static void profileAppend(String profile, String version)
            throws FileNotFoundException, IOException, ParseException {

        JSONParser parser = new JSONParser();
        Object obj = parser.parse(new FileReader(GetProperties.mcDir()
                + "/launcher_profiles.json"));
        JSONObject jsonObject = (JSONObject) obj;
        JSONObject profiles = (JSONObject) jsonObject.get("profiles");
        String selectedProfile = profile;
        String clientToken = (String) jsonObject.get("clientToken");
        JSONObject authenticationDatabase = (JSONObject) jsonObject
                .get("authenticationDatabase");

        JSONObject params = new JSONObject();

        params.put("lastVersionId", version);
        params.put("name", profile);
        profiles.put(profile, params);

        JSONObject test = new JSONObject();
        test.put("profiles", profiles);
        test.put("selectedProfile", selectedProfile);
        test.put("clientToken", clientToken);
        test.put("authenticationDatabase", authenticationDatabase);

        FileWriter file = new FileWriter(GetProperties.mcDir()
                + "/launcher_profiles-test.json");
        file.write(test.toJSONString());
        file.flush();
        file.close();

        System.out.println(test);
    }
}

以下是当前不成功的代码，因为格式无法正确写入文件

package minecraftMPC;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

public class Profile {

    public static void main(String[] args) throws FileNotFoundException, IOException, ParseException {
        profileAppend("test", "exampleName");
    }

    @SuppressWarnings("unchecked")
    public static void profileAppend(String profile, String version)
            throws FileNotFoundException, IOException, ParseException {

        JSONParser parser = new JSONParser();
        Object obj = parser.parse(new FileReader(GetProperties.mcDir()
                + "/launcher_profiles.json"));
        JSONObject jsonObject = (JSONObject) obj;
        JSONObject profiles = (JSONObject) jsonObject.get("profiles");
        String selectedProfile = profile;
        String clientToken = (String) jsonObject.get("clientToken");
        JSONObject authenticationDatabase = (JSONObject) jsonObject
                .get("authenticationDatabase");

        JSONObject params = new JSONObject();

        params.put("lastVersionId", version);
        params.put("name", profile);
        profiles.put(profile, params);

        JSONObject test = new JSONObject();
        test.put("profiles", profiles);
        test.put("selectedProfile", selectedProfile);
        test.put("clientToken", clientToken);
        test.put("authenticationDatabase", authenticationDatabase);

        FileWriter file = new FileWriter(GetProperties.mcDir()
                + "/launcher_profiles-test.json");
        file.write(test.toJSONString());
        file.flush();
        file.close();

        System.out.println(test);
    }
}

输出：

{"selectedProfile": "example", "profiles": {"example1": { "name": "example1","lastVersionId": "example1"}, "example2": {"name": "example2", "lastVersionId": "example2", "playerUUID": "00000000000000000000000000000000" }, "example3": {"name": "example3", "lastVersionId": "example3",}, },"clientToken": "000000000000000000000000000", "authenticationDatabase": { "000000000000000000000000000": { "username": "example@gmail.com", "accessToken": "000000000000000000000000000", "userid": "000000000000000000000000000", "uuid": "000000000000000000000000000", "displayName": "example" } } }

---

您的输出与预期一样，只是格式化为一行而不是多行。

您提供的输出是预期的还是实际的？您实际完成了输出，并且与预期相同，只是在一行中输出。：）那么，如何将其设置为多行呢？它的顺序也是错误的，selectedProfile输出的是第一行，而不是第二行。在上面的示例中，我需要它写入文件，而不是一行。同样，JSON顺序也不重要，因为字段是通过名称标识的。格式化并不重要，因为它通常由代码读取，而不是由人读取。我在上面分享的链接只是为了方便查看它在更可读的形式中的外观，但它在包含的数据方面没有任何区别。我理解，这是为了个人喜好和可读性。