Question

我正在寻找最简单的方法或任何可用于在java中读取csv文件的jar并转换为嵌套的json。我尝试搜索各种来源，但所有的地方我都可以找到简单的json的结果，但我需要的是我应该读取csv文件，后来必须转换为以下格式的json字符串

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

我对csv中的任何格式都没问题，但是在读完csv文件后我需要像上面那样创建json字符串。

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"

Answer 1

您可以使用SCIP Status : problem is solved [optimal solution found] Solving Time (sec) : 0.01 Solving Nodes : 1 Primal Bound : +1.40200000000000e+03 (2 solutions) Dual Bound : +1.40200000000000e+03 Gap : 0.00 % [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0] [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0] [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0] [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0] [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0] [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0] [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -0.0] [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -0.0] [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0] [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0] [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0] [1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -0.0] [-0.0, -0.0, -0.0, -0.0, 1.0, -0.0, -0.0, -0.0]将JackSon转换为CSV。例如，请参阅以下代码：

JSON

如果您使用的是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)); } }，则可以添加maven依赖关系，如下所示：

Jackson

解析csv数据并转换为嵌套的json java

1 个答案: