如何读写json文件

 

代码如下： 

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import org.json.JSONException;
import org.json.JSONObject;

public class readAndWriteJson {

    /**
     * @param args
     * @throws JSONException
     * @throws IOException
     */
    public static void main(String[] args) throws JSONException, IOException {
        // TODO Auto-generated method stub

        // String s = ReadFile("./src/test.json");
        // System.out.println(s);

        JSONObject jsonObject = new JSONObject();
        jsonObject.put("1", "一");
        jsonObject.put("2", "二");
        jsonObject.put("3", "三");
        jsonObject.put("4", "四");
        jsonObject.put("5", "五");
        jsonObject.put("6", "六");
        jsonObject.put("7", "⑦");
        System.out.println(jsonObject);

        writeFile("./src/test.json", jsonObject.toString());
    }

    public static void writeFile(String filePath, String sets)
            throws IOException {
        FileWriter fw = new FileWriter(filePath);
        PrintWriter out = new PrintWriter(fw);
        out.write(sets);
        out.println();
        fw.close();
        out.close();
    }

    public static String ReadFile(String path) {
        File file = new File(path);
        BufferedReader reader = null;
        String laststr = "";
        try {
            reader = new BufferedReader(new FileReader(file));
            String tempString = null;
            while ((tempString = reader.readLine()) != null) {
                laststr = laststr + tempString;
            }
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e1) {
                }
            }
        }
        return laststr;
    }
}