https://github.com/fracpete/gsonlines

Java library for reading/writing JSON lines data.
https://github.com/fracpete/gsonlines

java jsonlines maven

Last synced: about 1 month ago
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Java library for reading/writing JSON lines data.

• Host: GitHub
• URL: https://github.com/fracpete/gsonlines
• Owner: fracpete
• License: apache-2.0
• Created: 2023-11-07T03:00:57.000Z (about 1 year ago)
• Default Branch: main
• Last Pushed: 2024-01-07T22:47:31.000Z (about 1 year ago)
• Last Synced: 2024-10-19T12:15:45.319Z (3 months ago)
• Topics: java, jsonlines, maven
• Language: Java
• Homepage:
• Size: 27.3 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# gsonlines

Java library for reading/writing [JSON lines](https://jsonlines.org/) data using the 

[gson](https://github.com/google/gson) library under the hood for automatic 

deserialization/serialization of objects.

Automatically compresses/decompresses when the file name ends with `.gz`.

## Maven

Add the following to your `pom.xml`:

```xml

    

      com.github.fracpete

      gsonlines

      0.0.2

    

```

## Examples

### Stream

The following example reads one line at a time and writes one line at a time as well:

```java

import com.github.fracpete.gsonlines.StreamReader;

import com.github.fracpete.gsonlines.StreamWriter;

import java.io.File;

import java.util.Map;

public class Stream {

  public static void main(String[] args) throws Exception {

    File fin = new File("/some/where/in.jsonl.gz");

    File fout = new File("/some/where/out.jsonl.gz");

    StreamReader r = new StreamReader(fin);

    StreamWriter w = new StreamWriter(fout);

    while (r.hasNext()) {

      Map m = r.next(Map.class);

      // do something with the data

      w.write(m);

    }

    r.close();

    w.close();

  }

}

```

### Batch

The following example reads all the lines in one go, processes them and then writes them again to another file: 

```java

import com.github.fracpete.gsonlines.ArrayReader;

import com.github.fracpete.gsonlines.ArrayWriter;

import java.io.File;

import java.util.Map;

public class Batch {

  public static void main(String[] args) throws Exception {

    File fin = new File("/some/where/in.jsonl");

    ArrayReader r = new ArrayReader(fin);

    Map[] data = r.read(Map.class);

    r.close();

    // do something with the data

    File fout = new File("/some/where/out.jsonl");

    ArrayWriter w = new ArrayWriter(fout);

    w.write(data);

    w.close();

  }

}

```