在 Java 中将 JSON 转换为 XLS/CSV

问题描述：

有人有将 JSON 文档转换为 XLS/CSV 文件的示例 Java 代码吗?我曾尝试在 Google 上进行搜索，但无济于事.

Does anyone have any sample Java code to convert a JSON document to XLS/CSV file? I have tried to search on Google but to no avail.

答

您只能将 JSON 数组转换为 CSV 文件.

You could only convert a JSON array into a CSV file.

比方说，你有一个像下面这样的 JSON :

Lets say, you have a JSON like the following :

{"infile": [{"field1": 11,"field2": 12,"field3": 13},
            {"field1": 21,"field2": 22,"field3": 23},
            {"field1": 31,"field2": 32,"field3": 33}]}

让我们看看将其转换为 csv 的代码:

Lets see the code for converting it to csv :

import java.io.File;
import java.io.IOException;

import org.apache.commons.io.FileUtils;
import org.json.CDL;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

public class JSON2CSV {
    public static void main(String myHelpers[]){
        String jsonString = "{"infile": [{"field1": 11,"field2": 12,"field3": 13},{"field1": 21,"field2": 22,"field3": 23},{"field1": 31,"field2": 32,"field3": 33}]}";

        JSONObject output;
        try {
            output = new JSONObject(jsonString);


            JSONArray docs = output.getJSONArray("infile");

            File file=new File("/tmp2/fromJSON.csv");
            String csv = CDL.toString(docs);
            FileUtils.writeStringToFile(file, csv);
        } catch (JSONException e) {
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }        
    }

}

现在您获得了从 JSON 生成的 CSV.

Now you got the CSV generated from JSON.

它应该是这样的:

field1,field2,field3
11,22,33
21,22,23
31,32,33

maven 依赖就像，

The maven dependency was like,

<dependency>
    <groupId>org.json</groupId>
    <artifactId>json</artifactId>
    <version>20090211</version>
</dependency>

2019 年 12 月 13 日更新:

更新答案，因为现在我们也可以支持复杂的 JSON 数组.

Updating the answer, since now we can support complex JSON Arrays as well.

import java.nio.file.Files;
import java.nio.file.Paths;

import com.github.opendevl.JFlat;

public class FlattenJson {

    public static void main(String[] args) throws Exception {
        String str = new String(Files.readAllBytes(Paths.get("path_to_imput.json")));

        JFlat flatMe = new JFlat(str);

        //get the 2D representation of JSON document
        flatMe.json2Sheet().headerSeparator("_").getJsonAsSheet();

        //write the 2D representation in csv format
        flatMe.write2csv("path_to_output.csv");
    }

}

依赖项和文档详细信息位于 link

dependency and docs details are in link

在 Java 中将 JSON 转换为 XLS/CSV

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