Java后台导出json或txt文件到指定文件夹目录

main方法测试：

import com.alibaba.fastjson.JSONObject;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class Test {

    public static void main(String[] args) throws IOException {
        List<JSONObject> list = new ArrayList<>();
        JSONObject obj1 = new JSONObject();
        obj1.put("name", "张三");
        obj1.put("age", 20);
        obj1.put("sex", "男");

        JSONObject obj2 = new JSONObject();
        obj2.put("name", "李四");
        obj2.put("age", 30);
        obj2.put("sex", "女");
        list.add(obj1);
        list.add(obj2);

        String filePath = "E:\home\" + "test.json";//这里可以自己定义，可以导出txt或者json文件
        try {
            ExportCsvUtil.exportCsv(list, filePath);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }
}

ExportCsvUtil工具类：

import com.alibaba.fastjson.JSONObject;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.List;

public class ExportCsvUtil {

    public static <T> String exportCsv(List<JSONObject> list, String filePath) throws IOException, IllegalArgumentException, IllegalAccessException {
        File file = new File(filePath);
        //构建输出流，同时指定编码
        OutputStreamWriter ow = new OutputStreamWriter(new FileOutputStream(file), "gbk");

        for (int i = 0; i < list.size(); i++) {
            String s = list.get(i).toString();
            ow.write(list.get(i).toString());
            //写完一行换行
            ow.write("
");
        }
        ow.flush();
        ow.close();
        return "0";
    }
}

测试结果：