解析csv数据并转换为嵌套的json java [英] Parse csv data and convert to nested json java

问题描述

我正在寻找最简单的方法或任何可用的jar来读取Java中的csv文件并将其转换为嵌套的json.我尝试搜索各种来源，但所有地方我都能找到简单json的结果，但是我需要阅读csv文件，该文件以后必须转换为以下格式的json字符串

I'm searching for simplest way or any jar available to read csv file in java and convert to into nested json. I tried searching for various sources, but all the places i could find results for simple json, but my need is i should read csv file which later has to be converted to json string in the below format

{
    "studentName": "Foo",
    "Age": "12",
    "address":{
        "city" : "newyork",
        "address1": "North avenue",
        "zipcode" : "123213"
    },
    "subjects": [
        {
            "name": "English",
            "marks": "40"
        },
        {
            "name": "History",
            "marks": "50"
        }
    ]
}

我可以使用csv中的任何格式，但是在读取csv文件后，我需要创建上述的json字符串.

I'm fine with any format in csv, however after reading csv file i need to create json string like above.

csv文件格式:

"studentName","Age","address__city","address__address1","address__zipcode","subjects__name","subjects__marks"
"Foo","12","newyork","North avenue","123213","English","40"
"","","","","","History","50"

推荐答案

您可以使用JackSon将CSV转换为JSON.例如，请参见以下代码:

You can use JackSon to convert CSV to JSON. For example see the following code:

import java.io.File;
import java.util.List;
import java.util.Map;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.csv.CsvMapper;
import com.fasterxml.jackson.dataformat.csv.CsvSchema;

public class CSV2JSON {

    public static void main(String[] args) throws Exception {
        File input = new File("input.csv");
        File output = new File("output.json");

        CsvSchema csvSchema = CsvSchema.builder().setUseHeader(true).build();
        CsvMapper csvMapper = new CsvMapper();

        // Read data from CSV file
        List<object> readAll = csvMapper.readerFor(Map.class).with(csvSchema).readValues(input).readAll();

        ObjectMapper mapper = new ObjectMapper();

        // Write JSON formated data to output.json file
        mapper.writerWithDefaultPrettyPrinter().writeValue(output, readAll);

        // Write JSON formated data to stdout
        System.out.println(mapper.writerWithDefaultPrettyPrinter().writeValueAsString(readAll));
    }
}

如果使用的是maven，则可以添加Jackson依赖项，如下所示:

If you are using maven you can add the Jackson dependency as following:

   <dependency>
     <groupId>com.fasterxml.jackson.core</groupId>
     <artifactId>jackson-databind</artifactId>
     <version>2.8.9</version>
   </dependency>
   <dependency>
     <groupId>com.fasterxml.jackson.dataformat</groupId>
     <artifactId>jackson-dataformat-csv</artifactId>
     <version>2.8.9</version>
   </dependency> 

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