json多层嵌套，转成一层
package com.ruoyi.common.utils;
import net.sf.json.JSONObject;
import com.google.gson.*;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* 多层嵌套json数据转换为单层，同时规格化
**/
public class EsHitsUtils {
/**
*把拍平后的json进行格式化处理，输出标准的json格式
* @param uglyJSONString
* @return
*/
public static String jsonFormatter(String uglyJSONString){
Map map = new HashMap<>();
parseJson2Map(map,uglyJSONString,null);
JSONObject jsonObject = JSONObject.fromObject(map);
uglyJSONString = jsonObject.toString();
Gson gson = new GsonBuilder().setPrettyPrinting().create();
JsonParser jp = new JsonParser();
JsonElement je = jp.parse(uglyJSONString);
String prettyJsonString = gson.toJson(je);
System.out.println(prettyJsonString);
return "";
}
public static void parseJson2Map(Map map,JsonObject jsonObject,String parentKey){
for (Map.Entry object : jsonObject.entrySet()) {
String key = object.getKey();
JsonElement value = object.getValue();
String fullkey = (null == parentKey || parentKey.trim().equals("")) ? key : parentKey.trim() + "." + key;
//判断对象的类型，如果是空类型则安装空类型处理
if (value.isJsonNull()){
map.put(fullkey,null);
continue;
//如果是JsonObject对象则递归处理
}else if (value.isJsonObject()){
parseJson2Map(map,value.getAsJsonObject(),fullkey);
//如果是JsonArray数组则迭代，然后进行递归
}else if (value.isJsonArray()){
JsonArray jsonArray = value.getAsJsonArray();
Iterator iterator = jsonArray.iterator();
while (iterator.hasNext()) {
JsonElement jsonElement1 = iterator.next();
try {
jsonElement1.getAsJsonObject();
}catch (IllegalStateException ie){
map.put(fullkey,jsonElement1.getAsString());
continue;
}
parseJson2Map(map, jsonElement1.getAsJsonObject(), fullkey);
}
continue;
// 如果是JsonPrimitive对象则获取当中的值,则还需要再次进行判断一下
}else if (value.isJsonPrimitive()){
try {
JsonElement element = new JsonParser().parse(value.getAsString());
if (element.isJsonNull()){
map.put(fullkey,value.getAsString());
}else if (element.isJsonObject()) {
parseJson2Map(map, element.getAsJsonObject(), fullkey);
} else if (element.isJsonPrimitive()) {
JsonPrimitive jsonPrimitive = element.getAsJsonPrimitive();
if (jsonPrimitive.isNumber()) {
map.put(fullkey, jsonPrimitive.getAsNumber());
} else {
map.put(fullkey, jsonPrimitive.getAsString());
}
} else if (element.isJsonArray()) {
JsonArray jsonArray = element.getAsJsonArray();
Iterator iterator = jsonArray.iterator();
while (iterator.hasNext()) {
parseJson2Map(map, iterator.next().getAsJsonObject(), fullkey);
}
}
}catch (Exception e){
map.put(fullkey,value.getAsString());
}
}
}
}
/**
* 使用Gson拍平json字符串，即当有多层json嵌套时，可以把多层的json拍平为一层
* @param map
* @param json
* @param parentKey
*/
public static void parseJson2Map(Map map, String json, String parentKey){
JsonElement jsonElement = new JsonParser().parse(json);
if (jsonElement.isJsonObject()) {
JsonObject jsonObject = jsonElement.getAsJsonObject();
parseJson2Map(map,jsonObject,parentKey);
//传入的还是一个json数组
}else if (jsonElement.isJsonArray()){
JsonArray jsonArray = jsonElement.getAsJsonArray();
Iterator iterator = jsonArray.iterator();
while (iterator.hasNext()){
parseJson2Map(map,iterator.next().getAsJsonObject(),parentKey);
}
}else if (jsonElement.isJsonPrimitive()){
System.out.println("please check the json format!");
}else if (jsonElement.isJsonNull()){
}
}
public static void main(String[] args){
String json = "{\n" +
" \"_index\" : \"tomcat1-7.7.1-2020.06.22\",\n" +
" \"_type\" : \"_doc\",\n" +
" \"_id\" : \"F4vf2nIBOcu5RyqDQ6_a\",\n" +
" \"_score\" : 1.0,\n" +
" \"_source\" : {\n" +
" \"@timestamp\" : \"2020-06-22T07:12:43.505Z\",\n" +
" \"log\" : {\n" +
" \"offset\" : 146,\n" +
" \"file\" : {\n" +
" \"path\" : \"/root/apache-tomcat-8.5.16/logs/localhost_access_log.2020-06-22.txt\"\n" +
" }\n" +
" },\n" +
" \"message\" : \"192.168.81.1 - - [22/Jun/2020:00:12:33 -0700] \\\"GET /examples/ HTTP/1.1\\\" 304 -\",\n" +
" \"tags\" : [\n" +
" \"tomcat1\"\n" +
" ],\n" +
" \"input\" : {\n" +
" \"type\" : \"log\"\n" +
" },\n" +
" \"host\" : {\n" +
" \"architecture\" : \"x86_64\",\n" +
" \"os\" : {\n" +
" \"version\" : \"7 (Core)\",\n" +
" \"family\" : \"redhat\",\n" +
" \"name\" : \"CentOS Linux\",\n" +
" \"kernel\" : \"3.10.0-514.el7.x86_64\",\n" +
" \"codename\" : \"Core\",\n" +
" \"platform\" : \"centos\"\n" +
" },\n" +
" \"name\" : \"localhost.localdomain\",\n" +
" \"id\" : \"3ead4e1cf63c492c9899a03473532132\",\n" +
" \"containerized\" : false,\n" +
" \"ip\" : [\n" +
" \"192.168.81.129\",\n" +
" \"fe80::e381:bd93:fc44:e18c\",\n" +
" \"192.168.122.1\"\n" +
" ],\n" +
" \"mac\" : [\n" +
" \"00:0c:29:93:18:9c\",\n" +
" \"52:54:00:5c:62:5b\",\n" +
" \"52:54:00:5c:62:5b\"\n" +
" ],\n" +
" \"hostname\" : \"localhost.localdomain\"\n" +
" },\n" +
" \"agent\" : {\n" +
" \"hostname\" : \"localhost.localdomain\",\n" +
" \"id\" : \"a3236c26-74e9-45ad-9e2e-e49184e17812\",\n" +
" \"version\" : \"7.7.1\",\n" +
" \"type\" : \"filebeat\",\n" +
" \"ephemeral_id\" : \"e8efb94d-553d-42b7-a18f-060c398a1b81\"\n" +
" },\n" +
" \"ecs\" : {\n" +
" \"version\" : \"1.5.0\"\n" +
" }\n" +
" }\n" +
"}";
System.out.println(jsonFormatter(json));
}
}
输入结果如下：
{
"_index": "tomcat1-7.7.1-2020.06.22",
"_source.host.ip": "192.168.122.1",
"_source.host.os.family": "redhat",
"_score": 1,
"_source.host.name": "localhost.localdomain",
"_source.agent.type": "filebeat",
"_source.host.id": "3ead4e1cf63c492c9899a03473532132",
"_source.input.type": "log",
"_source.log.offset": 146,
"_source.host.os.platform": "centos",
"_source.agent.ephemeral_id": "e8efb94d-553d-42b7-a18f-060c398a1b81",
"_source.agent.hostname": "localhost.localdomain",
"_source.tags": "tomcat1",
"_source.host.containerized": "false",
"_type": "_doc",
"_source.host.mac": "52:54:00:5c:62:5b",
"_source.host.os.version": "7 (Core)",
"_source.agent.version": "7.7.1",
"_source.host.hostname": "localhost.localdomain",
"_source.host.os.kernel": "3.10.0-514.el7.x86_64",
"_source.host.os.name": "CentOS Linux",
"_source.host.os.codename": "Core",
"_source.log.file.path": "/root/apache-tomcat-8.5.16/logs/localhost_access_log.2020-06-22.txt",
"_source.host.architecture": "x86_64",
"_source.@timestamp": "2020-06-22T07:12:43.505Z",
"_source.agent.id": "a3236c26-74e9-45ad-9e2e-e49184e17812",
"_id": "F4vf2nIBOcu5RyqDQ6_a",
"_source.ecs.version": "1.5.0",
"_source.message": "192.168.81.1 - - [22/Jun/2020:00:12:33 -0700] \"GET /examples/ HTTP/1.1\" 304 -"
}
com.google.code.gson
gson
2.8.2
net.sf.json-lib
json-lib
2.4
jdk15