将json字符串递归解析成类列表
将json字符串递归解析成类列表
- 需求
- 上代码
-
- 解析器类
- 类型枚举类
- 实体
- 测试类
- 打完收功
需求
将json字符串的所有层都解析出来，得到每一层的信息，包括：层级、每层的key（如果是array类型，key是上一层的key）、每层的值、当前类型（JSONObject/JSONArray/Other）、父key、父类型 （JSONObject/JSONArray/Other）。
上代码
解析器类
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class JSONParser {
public List<JSONEntity> analysisJSON(String data) {
List<JSONEntity> jsonEntities = new ArrayList<>();
this.analysisJSON(data, jsonEntities, null, null, null, 0);
return jsonEntities;
}
public void analysisJSON(String value,
List<JSONEntity> jsonEntities,
String key,
JSONType parentType,
String parentKey,
Integer level) {
JSONType jsonType = this.typeJudge(value);
switch (jsonType) {
case JSON_OBJECT:
JSONObject jsonObject = JSON.parseObject(value);
jsonObject.forEach((sunKey, sunValue) ->
this.analysisJSON(String.valueOf(sunValue), jsonEntities, sunKey, jsonType, key, level + 1));
break;
case JSON_ARRAY:
JSONArray objects = JSON.parseArray(value);
objects.forEach(sunValue ->
this.analysisJSON(String.valueOf(sunValue), jsonEntities, null, jsonType, key, level + 1));
break;
}
JSONEntity jsonEntity = new JSONEntity();
jsonEntity.setLevel(level);
jsonEntity.setKey(key);
jsonEntity.setParentType(parentType);
jsonEntity.setValue(value);
jsonEntity.setType(jsonType);
jsonEntity.setParentKey(parentKey);
jsonEntities.add(jsonEntity);
}
private JSONType typeJudge(String param) {
Object parse;
try {
parse = JSON.parse(param);
} catch (Exception e) {
return JSONType.OTHER;
}
if (parse instanceof JSONObject) {
return JSONType.JSON_OBJECT;
} else if (parse instanceof JSONArray) {
return JSONType.JSON_ARRAY;
} else {
return JSONType.OTHER;
}
}
}
类型枚举类
public enum JSONType {
JSON_OBJECT,
JSON_ARRAY,
OTHER
}
实体
import lombok.Data;
import lombok.ToString;
@Data
@ToString
public class JSONEntity {
/**
* 层级
*/
private Integer level;
/**
* key
*/
private String key;
/**
* 每层的值
*/
private String value;
/**
* 当前类型 JSONObject/JSONArray/Other
*/
private JSONType type;
/**
* 父类型 JSONObject/JSONArray/Other
*/
private JSONType parentType;
/**
* 父key
*/
private String parentKey;
}
测试类
import java.util.Comparator;
import java.util.List;
public class Test {
public static void main(String[] args) {
// String params = "[{\n" +
// "\t\"flag\": \"2\",\n" +
// "\t\"tea_id\": \"2002\",\n" +
// "\t\"students\": [{\n" +
// "\t\t\"stu_id\": \"1003\",\n" +
// "\t\t\"stu_name\": \"zhangsan\"\n" +
// "\t}, {\n" +
// "\t\t\"stu_id\": \"1004\",\n" +
// "\t\t\"stu_name\": \"李四\"\n" +
// "\t}],\n" +
// "\t\"tea_name\": \"王五\",\n" +
// "\t\"haha\": [890, 678],\n" +
// "\t\"test\": {\n" +
// "\t\t\"l2\": \"qqq\",\n" +
// "\t\t\"ww\": {\n" +
// "\t\t\t\"l3\": \"v3\"\n" +
// "\t\t}\n" +
// "\t}\n" +
// "}, {\n" +
// "\t\"flag\": \"1\",\n" +
// "\t\"tea_id\": \"2001\",\n" +
// "\t\"students\": [{\n" +
// "\t\t\"stu_id\": \"1001\",\n" +
// "\t\t\"stu_name\": \"十一郎\"\n" +
// "\t}, {\n" +
// "\t\t\"stu_id\": \"1002\",\n" +
// "\t\t\"stu_name\": \"十二郎\"\n" +
// "\t}],\n" +
// "\t\"tea_name\": \"晓春\",\n" +
// "\t\"haha\": [123, 456],\n" +
// "\t\"test\": {\n" +
// "\t\t\"l2\": \"qqq\",\n" +
// "\t\t\"ww\": {\n" +
// "\t\t\t\"l3\": \"v3\"\n" +
// "\t\t}\n" +
// "\t}\n" +
// "}, {\n" +
// "\t\"a\": [1, 2, 3],\n" +
// "\t\"b\": {\n" +
// "\t\t\"flag\": \"2\",\n" +
// "\t\t\"tea_id\": \"2002\",\n" +
// "\t\t\"students\": [{\n" +
// "\t\t\t\"stu_id\": \"1003\",\n" +
// "\t\t\t\"stu_name\": \"zhangsan\"\n" +
// "\t\t}, {\n" +
// "\t\t\t\"stu_id\": \"1004\",\n" +
// "\t\t\t\"stu_name\": \"李四\"\n" +
// "\t\t}],\n" +
// "\t\t\"tea_name\": \"王五\",\n" +
// "\t\t\"haha\": [890, 678],\n" +
// "\t\t\"test\": {\n" +
// "\t\t\t\"l2\": \"qqq\",\n" +
// "\t\t\t\"ww\": {\n" +
// "\t\t\t\t\"l3\": \"v3\"\n" +
// "\t\t\t}\n" +
// "\t\t}\n" +
// "\t}\n" +
// "}]";
String params = "{\n" +
"\t\"a\": [1, 2, 3],\n" +
"\t\"b\": {\n" +
"\t\t\"flag\": \"2\",\n" +
"\t\t\"tea_id\": \"2002\",\n" +
"\t\t\"students\": [{\n" +
"\t\t\t\"stu_id\": \"1003\",\n" +
"\t\t\t\"stu_name\": \"zhangsan\"\n" +
"\t\t}, {\n" +
"\t\t\t\"stu_id\": \"1004\",\n" +
"\t\t\t\"stu_name\": \"李四\"\n" +
"\t\t}],\n" +
"\t\t\"tea_name\": \"王五\",\n" +
"\t\t\"haha\": [890, 678],\n" +
"\t\t\"test\": {\n" +
"\t\t\t\"l2\": \"qqq\",\n" +
"\t\t\t\"ww\": {\n" +
"\t\t\t\t\"l3\": \"v3\"\n" +
"\t\t\t}\n" +
"\t\t}\n" +
"\t}\n" +
"}";
System.out.println("params=" + params);
JSONParser parser = new JSONParser();
List<JSONEntity> jsonEntities = parser.analysisJSON(params);
jsonEntities.stream().sorted(Comparator.comparing(JSONEntity::getLevel)).forEach(System.out::println);
}
}