从文件中读取json格式的数据_fileutil读json文件为json-优快云博客

本文介绍如何在Java中创建一个工具类FileUtils，专门用于读取和解析JSON格式的文件内容。

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新建一个工具类FileUtils，用来读取文件内容

public class FileUtils {

    public String ReadFile(String Path) {
        BufferedReader reader = null;
        String laststr = "";
        try {
            FileInputStream fileInputStream = new FileInputStream(Path);
            InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream, "gbk");
            reader = new BufferedReader(inputStreamReader);
            String tempString = null;
            while ((tempString = reader.readLine()) != null) {
                laststr += tempString;
            }
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return laststr;
    }

}

JSon文件显示

public class JsonUtils {

    public static void main(String[] args) {
        String JsonContext = new FileUtils().ReadFile("F:\\1.txt");
        //将读取的数据转换为JSONObject
        System.out.println("String:"+JsonContext);
        JSONArray jsonArray = JSONArray.fromObject(JsonContext);
        System.out.println("jsonArray:"+jsonArray);
        int size = jsonArray.size();
        //System.out.println("Size: " + size);
        for (int i = 0; i < size; i++) {
            JSONObject jsonObject = jsonArray.getJSONObject(i);
            //System.out.println(jsonObject);
            //System.out.println("[" + i + "]id=" + jsonObject.get("id"));
            //System.out.println("[" + i + "]ip=" + jsonObject.get("ip"));
            //System.out.println("[" + i + "]zname=" + jsonObject.get("zname"));
            //List list = (List) jsonObject.get("pais");
            //System.out.println("[" + i + "]pais=" + list);

        }
}