java程序实现JSON格式的报文转换成XPATH格式

注意：需要引入额外的jar包来支持这个程序“fastjson”。

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import java.io.*;

public class Test {
    public static void main(String[] args) {
        BaoWenZhuanHuan zhuanHuan = new BaoWenZhuanHuan();
        String filePath = "C:\\file\\origin.txt";   //读取文件的路径
        String jsonString = zhuanHuan.readTxtFile(filePath);
        zhuanHuan.Json2Xpath(jsonString);
    }
}

class BaoWenZhuanHuan {
    //获取JSON报文
    public String readTxtFile(String filePath) {
        String jsonString = "";
        try {
            String encoding = "GBK";
            File file = new File(filePath);
            if (file.isFile() && file.exists()) { //判断文件是否存在
                InputStreamReader read = new InputStreamReader(new FileInputStream(file), encoding);//考虑到编码格式
                BufferedReader bufferedReader = new BufferedReader(read);
                String lineTxt = null;
                while ((lineTxt = bufferedReader.readLine()) != null) {
                    jsonString += lineTxt;
                }
                System.out.println(jsonString);
                read.close();
            } else {
                System.out.println("找不到指定的文件");
            }
        } catch (Exception e) {
            System.out.println("读取文件内容出错");
            e.printStackTrace();
        }
        return jsonString;
    }

    public void Json2Xpath(String jsonStr) {
        System.out.println("json转换成xpath:");
        JSONObject json = JSON.parseObject(jsonStr);
        StringBuffer sb = new StringBuffer();
        for (Object key : json.keySet()) {
            Object value = json.get(key);
            int flag = 1;
            sb.append(iteraorJson(value, key, flag));
        }
        System.out.println(sb);
        outPutTxt(sb);
    }

    /**
     * 迭代判断value是否还包含jSONObject
     *
     * @param value
     * @return
     */
    public String iteraorJson(Object value, Object key1, int flag) {
        StringBuffer sb = new StringBuffer("");
        if ((value.toString().contains(":"))) {
            JSONObject json = ((JSONObject) value);
            for (Object key : json.keySet()) {
                if (flag == 1) {
                    sb.append("/sdoroot").append("/").append(changeKey(key1));
                } else {
                    sb.append("/").append(changeKey(key1));
                }
                Object value2 = json.get(key);
                flag = 2;
                sb.append(iteraorJson(value2, key, flag));
                flag = 1;
            }
        } else {
            if (flag == 1) {
                sb.append("/sdoroot").append("/").append(changeKey(key1)).append("=").append(value).append("\r\n");
            } else {
                sb.append("/").append(changeKey(key1)).append("=").append(value).append("\r\n");
            }
        }
        return sb.toString();
    }

    /*
        去掉非字母的字符，并且把大写字母转换成小写字母
    */
    public String changeKey(Object key) {
        return key.toString().replaceAll("[^a-zA-Z]", "").toLowerCase();
    }

    /*把转换后的结果输出到文件*/
    public void outPutTxt(StringBuffer sb) {
        FileOutputStream fos = null;
        File file;
        try {
            // 指定写入文件的路径
            file = new File("C:\\Users\\GNA\\Desktop\\lala.txt");    //转换后的路径
            fos = new FileOutputStream(file);
            /* 先检测文件是否存在，如果不存在则先创建*/
            if (!file.exists()) {
                file.createNewFile();
            }

            /*
             * 字符串的内容没法直接写到文件，我们需要先使用getBytes转换为bytes。
             */
            byte[] bytesArray = sb.toString().getBytes();
            fos.write(bytesArray);
            fos.flush();
            System.out.println("File Written Successfully");
        } catch (IOException ioe) {
            ioe.printStackTrace();
        } finally {
            try {
                if (fos != null) {
                    fos.close();
                }
            } catch (IOException ioe) {
                System.out.println("Error in closing the Stream");
            }
        }
    }
}