解析yml文件 转换 Map_missing map key

起因

有一个需求是把一个yml文件解析成HashMap格式的数据，文件内容如下

spring:
  datasource:
    serviceDB:
      jdbc-url: jdbc:mysql://127.0.0.1:3306/serviceDB
      password: test
      minimum-idle: 1
      idle-timeout: 60000
      maximum-pool-size: 150
      username: root
    cluster:
       - key: bi
         jdbc-url: jdbc:mysql://127.0.0.1:3306/test
         password: test
         minimum-idle: 1
         idle-timeout: 60000
         maximum-pool-size: 150
         username: root
       - key: his
         jdbc-url: jdbc:mysql://127.0.0.1:3306/his
         password: test
         minimum-idle: 1
         idle-timeout: 60000
         maximum-pool-size: 150
         username: root
 
config:
  schedul:
    onOff: false
  orderGen:
     masterWorkerId: 1
     backupWorkerId: 2

解析得到的结果如下所示：

{
  "spring.datasource.serviceDB.jdbc-url": "jdbc:mysql://127.0.0.1:3306/serviceDB",
  "spring.datasource.serviceDB.password": "test",
  "spring.datasource.serviceDB.username": "root",
  "spring.datasource.cluster[0].key": "bi",
  "spring.datasource.cluster[1].maximum-pool-size": "150",
  "config.schedul.onOff": "false",
  "spring.datasource.cluster[0].password": "test",
  "spring.datasource.cluster[0].maximum-pool-size": "150",
  "spring.datasource.cluster[1].username": "root",
  "spring.datasource.serviceDB.idle-timeout": "60000",
  "config.orderGen.backupWorkerId": "2",
  "spring.datasource.cluster[1].idle-timeout": "60000",
  "spring.datasource.serviceDB.minimum-idle": "1",
  "spring.datasource.cluster[0].username": "root",
  "spring.datasource.cluster[1].key": "his",
  "config.orderGen.masterWorkerId": "1",
  "spring.datasource.cluster[0].minimum-idle": "1",
  "spring.datasource.cluster[0].idle-timeout": "60000",
  "spring.datasource.cluster[1].password": "test",
  "spring.datasource.cluster[0].jdbc-url": "jdbc:mysql://127.0.0.1:3306/test",
  "spring.datasource.serviceDB.maximum-pool-size": "150",
  "spring.datasource.cluster[1].minimum-idle": "1",
  "spring.datasource.cluster[1].jdbc-url": "jdbc:mysql://127.0.0.1:3306/his"
}

实现思路

第一步：使用yml读取文件

Yaml yaml = new Yaml();
Map<String, Object> testMap =  
        yaml.load( new BufferedReader(new FileReader("test.yml")));

但是此时得到的testMap不是我们想要的结果，testMap的内容如下：

{"spring":{"datasource":{"serviceDB":{"jdbc-url":"jdbc:mysql://127.0.0.1:3306/serviceDB","password":"test","minimum-idle":1,"idle-timeout":60000,"maximum-pool-size":150,"username":"root"},"cluster":[{"key":"bi","jdbc-url":"jdbc:mysql://127.0.0.1:3306/test","password":"test","minimum-idle":1,"idle-timeout":60000,"maximum-pool-size":150,"username":"root"},{"key":"his","jdbc-url":"jdbc:mysql://127.0.0.1:3306/his","password":"test","minimum-idle":1,"idle-timeout":60000,"maximum-pool-size":150,"username":"root"}]}},"config":{"schedul":{"onOff":false},"orderGen":{"masterWorkerId":1,"backupWorkerId":2}}}

第二步：得到testMap后需要进行进一步的解析，得到需要的结果，这个时候就要使用递归解析了，需要注意的是对于yml中数组的解析要重点处理

核心代码如下：

 /**
     * 
     * @Title: json2propMap 
     * @Description: 解析json 转换 Map
     * @param jsonObject
     * @return  
     * @throws 
     *
     */
    public static Map<String, Object> json2propMap(JSONObject jsonObject){
        String tmpKey = "";
        String tmpKeyPre = "";
        Map<String, Object> configMap = new HashMap<String, Object>();
        json2prop(jsonObject, tmpKey, tmpKeyPre, configMap);
        return configMap;
    }
    
    /**
     * 
     * @Title: json2prop 
     * @Description: 递归解析
     * @param jsonObject
     * @param tmpKey
     * @param tmpKeyPre
     * @param configMap  
     * @throws 
     *
     */
    private static void json2prop(JSONObject jsonObject, String tmpKey, String tmpKeyPre, Map<String, Object> configMap) {
        Iterator<String> iterator = jsonObject.keySet().iterator();
        while (iterator.hasNext()) {
            // 获得key
            String key = iterator.next();
            String value = jsonObject.getString(key);
            Object valueObject = null;
            try {
                valueObject = JSONObject.parse(value);
            } catch (Exception e) {
                // 如果解析出错，就说明已经到头了，放入map然后继续解析
                configMap.put(tmpKey + key, value);
                continue;
            }
            // 如果是集合，需要特殊解析
            if (valueObject instanceof Collection<?>) {
                List<?> list = (List<?>)valueObject;
                tmpKeyPre = tmpKey;
//                tmpKey += key;
                for (int i = 0; i < list.size(); i++) {
                    String itemKey = tmpKey + key + "["+i+"]" + ".";
                    JSONObject itemValue = (JSONObject)list.get(i);
                    json2prop(itemValue, itemKey, tmpKeyPre, configMap);
                }
            } else if (valueObject instanceof JSONObject) {
                JSONObject jsonStr = JSONObject.parseObject(value);
                tmpKeyPre = tmpKey;
                tmpKey += key + ".";
                json2prop(jsonStr, tmpKey, tmpKeyPre, configMap);
                tmpKey = tmpKeyPre;
            } else {
                configMap.put(tmpKey + key, value);
                continue;
            }
        }
    }

第三步：得到最终结果，终极代码如下：

public static void main(String[] args) throws FileNotFoundException {
        Yaml yaml = new Yaml();
        Map<String, Object> testMap = yaml.load( new BufferedReader(new FileReader("test.yml")));
        System.out.println(JsonUtil.toJson(testMap));
        JSONObject jsonObject = JSONObject.parseObject(JsonUtil.toJson(testMap));
        // 递归解析Map
        testMap = JsonUtil.json2propMap(jsonObject);
        System.out.println(JsonUtil.toJson(testMap));
    }