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How to Parse Csv to Json From 2 Csv Files In Groovy?

5 minutes read

To parse CSV files to JSON in Groovy, you can use the built-in CSV reader and the JsonBuilder classes. First, you will need to read the CSV files using a CSV reader, then convert the data into a JSON object using JsonBuilder. This process can be done by iterating through the CSV data line by line, parsing each line into a map, and then converting the map into a JSON object.


You can use the following code snippet to parse data from two CSV files into JSON:

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import groovy.json.JsonBuilder
import org.apache.commons.csv.CSVFormat
import org.apache.commons.csv.CSVParser

def file1 = new File("file1.csv")
def file2 = new File("file2.csv")

def data1 = new CSVParser(file1.newReader(), CSVFormat.EXCEL).getRecords()
def data2 = new CSVParser(file2.newReader(), CSVFormat.EXCEL).getRecords()

def jsonBuilder = new JsonBuilder()

jsonBuilder {
    csvData1(data1.collect { row ->
        row.toMap()
    })

    csvData2(data2.collect { row ->
        row.toMap()
    })
}

def jsonData = jsonBuilder.toPrettyString()
println jsonData


In this code snippet, we read the data from two CSV files ("file1.csv" and "file2.csv") and convert it into JSON format using the JsonBuilder class. You can further customize the JSON structure and add additional logic as needed.


How to handle different line endings in csv files when parsing to json in groovy?

When parsing a CSV file to JSON in Groovy, you may encounter different line endings depending on the platform where the CSV file was created. To handle this situation, you can use the CSVParser class from the Apache Commons CSV library, which provides a way to specify the line ending character when reading the CSV file.


Here is an example of how you can handle different line endings in CSV files when parsing to JSON in Groovy:

  1. Add the Apache Commons CSV library to your Groovy project. You can do this by adding the following dependency to your build file (e.g., build.gradle):
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dependencies {
    implementation 'org.apache.commons:commons-csv:1.8'
}


  1. Use the CSVParser class to read the CSV file and handle different line endings. Specify the line ending character (e.g., \r\n for Windows, \n for Unix) when creating the parser:
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@Grab('org.apache.commons:commons-csv:1.8')

import org.apache.commons.csv.CSVParser
import org.apache.commons.csv.CSVFormat

def file = new File("/path/to/csv/file.csv")
def parser = CSVParser.parse(file, CSVFormat.DEFAULT.withRecordSeparator("\r\n"))

def records = parser.getRecords()

def jsonData = []

records.each { record ->
    def parsedData = [:]
    for (int i = 0; i < record.size(); i++) {
        parsedData["column${i + 1}"] = record.get(i)
    }
    jsonData.add(parsedData)
}

println jsonData


In this example, we create a CSVParser object using CSVFormat.DEFAULT.withRecordSeparator("\r\n") to specify the line ending character as \r\n. You can adjust this line according to the line ending character used in your CSV file.

  1. Process the parsed data as needed and convert it to JSON format.


By using the Apache Commons CSV library and specifying the line ending character when creating the CSVParser, you can handle different line endings in CSV files when parsing to JSON in Groovy.


What libraries are available for parsing csv to json in groovy?

  1. Apache Commons CSV: Apache Commons CSV is a library that provides utilities for parsing and writing CSV files. It can be used to parse CSV files and convert them to JSON format in Groovy.
  2. Groovy CSV: Groovy CSV is a library that provides utilities for working with CSV files in Groovy. It allows you to parse CSV files and convert them to JSON format.
  3. Jackson CSV: Jackson CSV is a part of the Jackson JSON library that provides utilities for working with CSV files. It can be used to parse CSV files and convert them to JSON format in Groovy.
  4. OpenCSV: OpenCSV is a popular library for working with CSV files in Java and Groovy. It allows you to parse CSV files and convert them to JSON format easily.
  5. CsvParser: CsvParser is a lightweight and simple library for parsing CSV files in Groovy. It can be used to convert CSV files to JSON format.


What is the best approach to parsing data from csv to json in groovy?

One common approach to parsing data from a CSV file to JSON in Groovy is to use the Groovy CSV library and a JSON library such as JsonBuilder or JsonSlurper.


Here is an example of how you can parse data from a CSV file to JSON in Groovy:

  1. First, you need to import the necessary libraries:
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@Grapes(
    @Grab(group='net.sf.supercsv', module='super-csv', version='2.4.0'),
    @Grab(group='org.codehaus.groovy', module='groovy-json', version='3.0.6')
)

import groovy.json.JsonBuilder
import org.supercsv.io.CsvMapReader
import org.supercsv.prefs.CsvPreference
import org.supercsv.io.ICsvMapReader


  1. Next, you need to read the CSV file and convert the data to a Map:
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def reader = new File("data.csv").newReader()
def csvReader = new CsvMapReader(reader, CsvPreference.STANDARD_PREFERENCE)

def headers = csvReader.getHeader(true)
def data = []

Map record
while((record = csvReader.read(headers)) != null) {
    data << record
}

csvReader.close()


  1. Finally, you can convert the data to JSON format using JsonBuilder:
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def json = new JsonBuilder()

json.data {
    data.each { row ->
        row.each { key, value ->
            "$key" "$value"
        }
    }
}

def jsonString = json.toPrettyString()
println jsonString


This is just one example of how you can parse data from a CSV file to JSON in Groovy. There are many other ways to achieve the same result, depending on your requirements and the structure of your data.


What is the best way to convert csv to json using groovy?

One way to convert a CSV file to JSON using Groovy is to use the Groovy CSV parser library along with the JsonBuilder class. Here is an example code snippet that demonstrates how to do this:

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@Grapes([
    @Grab(group='org.codehaus.groovy.modules.http-builder', module='http-builder', version='0.7.1'),
    @Grab(group='com.xlson.groovycsv', module='groovycsv', version='1.3')
])

import groovyx.net.http.RESTClient
import groovy.json.JsonBuilder
import com.xlson.groovycsv.CsvParser

def csvFile = new File('/path/to/csv/file.csv')
def csvData = []

csvFile.eachLine { line ->
    // Parse the CSV line and add it to the list
    csvData.add(CsvParser.parse(line))
}

def jsonBuilder = new JsonBuilder(csvData)
def jsonData = jsonBuilder.toPrettyString()

println jsonData


In this code snippet, we first import the necessary libraries using the @Grapes annotation. We then read the CSV file line by line, parse each line using the CsvParser class from the Groovy CSV library, and add the parsed data to a list. Finally, we use the JsonBuilder class to convert the list containing the CSV data to a JSON string and print it to the console.


You can run this script in a Groovy script or Groovy console to convert a CSV file to JSON.

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