Java动态递归解析任意层复杂Json，并编写BVH文件前言完结

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我是靠谱客的博主个性铅笔，最近开发中收集的这篇文章主要介绍Java动态递归解析任意层复杂Json，并编写BVH文件前言完结，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

Java动态递归解析复杂Json，并编写BVH文件

前言
- 代码部分
- 运行结果
完结

前言

遇到一个需求，我们公司目前在做动作捕捉的项目，动作捕捉有个功能要输出一个BVH类型的文件（至于是什么类型文件我就不多解释了，有兴趣的可以查一下），因为没有生成BVH文件相关的库，所以我用Java语言写了一个（代码写的垃圾，我就提个思路，轻点喷我=.=）。

代码部分

我用的是fastjson

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

json的字符串是复杂的多层嵌套json，json嵌套json对象/json数组多层嵌套。撇去写入buffer的部分，可以用来解析复杂多层json。


private static StringBuffer buf;//全局buffer字符缓存
private static int num = 0;//计数
public static void main(String[] args) {
String str = "{"control":"BVHControl","type":"1","action":"start","children":{"name":"crotch","offset":[0,0,0],"children":[{"name":"back","offset":[0,2,0],"children":[{"name":"head","offset":[0,1,0]},{"name":"leftShoulder","offset":[-1,1,0],"children":[{"name":"leftUpperArm","offset":[-1,0,0],"children":[{"name":"leftLowerArm","offset":[-1,0,0],"children":[{"name":"leftHand","offset":[-1,0,0]}]}]}]},{"name":"rightShoulder","offset":[1,1,0],"children":[{"name":"rightUpperArm","offset":[1,0,0],"children":[{"name":"rightLowerArm","offset":[1,0,0],"children":[{"name":"rightHand","offset":[1,0,0]}]}]}]}]},{"name":"leftUpperLeg","offset":[-1,-1.5,0],"children":[{"name":"leftLowerLeg","offset":[0,-1.2,0],"children":[{"name":"leftFoot","offset":[0,0,0.3]}]}]},{"name":"rightUpperLeg","offset":[1,-1.5,0],"children":[{"name":"rightLowerLeg","offset":[0,-1.2,0],"children":[{"name":"rightFoot","offset":[0,0,0.3]}]}]}]}}";
buf = new StringBuffer();//初始化buffer
buf.append("HIERARCHYn");//写文件头
JSONObject jsonObject = JSONObject.parseObject(str);//转换json字符串
jsonJX(jsonObject);//调用json解析方法
System.out.println(buf);
}
//解析json并写入buffer缓冲的核心方法
public static void jsonJX(JSONObject jsonObject) {
String children = jsonObject.getString("children");//获取节点数据
num++;//统计方法调用次数，为了算缩进距离和{}位置
if (children.substring(0,1).equals("{")
&& children.substring(children.length()-1).equals("}")){//通过判断字符串的括号，转jsonObject
JSONObject json = JSON.parseObject(children);//获取子节点数据
buf.append("ROOT ").append(json.getString("name")).append("n");//拼接根节点名称
buf.append("{n");
buf.append(strPloidy(num)).append("OFFSET").append(strAddTab(json.getJSONArray("offset"))).append("n");//拼接offset偏移量
buf.append(strPloidy(num)).append("CHANNELS 6 Xposition Yposition Zposition Zrotation Yrotation Xrotationn");
if (json.containsKey("children")){//判断是否还有子节点
jsonJX(json);//有子节点，递归调用方法继续解析
}
buf.append(strPloidy(num)).append("}n");
}else if (children.substring(0,1).equals("[")
&& children.substring(children.length()-1).equals("]")){//通过判断字符串的括号，转jsonArray
JSONArray arrJson = JSON.parseArray(children);//获取子节点array数据
for (int i=0;i<arrJson.size();i++) {//循环节点数组
JSONObject newJson = JSON.parseObject(arrJson.get(i).toString());//将节点数据转成json对象
buf.append(strPloidy(num-1)).append("JOINT ").append(newJson.getString("name")).append("n");//拼接子节点名称
buf.append(strPloidy(num)).append("{n");
buf.append(strPloidy(num)).append("OFFSET").append(strAddTab(newJson.getJSONArray("offset"))).append("n");//拼接子节点offset偏移量
buf.append(strPloidy(num)).append("CHANNELS 3 Zrotation Yrotation Xrotationn");
if (newJson.containsKey("children")){//判断是否还有子节点
jsonJX(newJson);//有子节点，递归调用方法继续解析
}
buf.append(strPloidy(num)).append("}n");
}
}
num=num-1;//计算}缩进位置
}
//添加缩进方法,参数num:缩进次数
private static String strPloidy(int num) {
String str = "
";
for (int i = 1; i < num; i++) {
str += "
";
}
return str;
}
//解析offset偏移量数组方法，在每个元素中间添加空格
private static String strAddTab(JSONArray json) {
String str = "";
for (int i = 0; i < json.size(); i++) {
str += " " + json.get(i);
}
return str;
}

运行结果

这是运行后的打印结果：

HIERARCHY
ROOT crotch
{
OFFSET 0 0 0
CHANNELS 6 Xposition Yposition Zposition Zrotation Yrotation Xrotation
JOINT back
{
OFFSET 0 2 0
CHANNELS 3 Zrotation Yrotation Xrotation
JOINT head
{
OFFSET 0 1 0
CHANNELS 3 Zrotation Yrotation Xrotation
}
JOINT leftShoulder
{
OFFSET -1 1 0
CHANNELS 3 Zrotation Yrotation Xrotation
JOINT leftUpperArm
{
OFFSET -1 0 0
CHANNELS 3 Zrotation Yrotation Xrotation
JOINT leftLowerArm
{
OFFSET -1 0 0
CHANNELS 3 Zrotation Yrotation Xrotation
JOINT leftHand
{
OFFSET -1 0 0
CHANNELS 3 Zrotation Yrotation Xrotation
}
}
}
}
JOINT rightShoulder
{
OFFSET 1 1 0
CHANNELS 3 Zrotation Yrotation Xrotation
JOINT rightUpperArm
{
OFFSET 1 0 0
CHANNELS 3 Zrotation Yrotation Xrotation
JOINT rightLowerArm
{
OFFSET 1 0 0
CHANNELS 3 Zrotation Yrotation Xrotation
JOINT rightHand
{
OFFSET 1 0 0
CHANNELS 3 Zrotation Yrotation Xrotation
}
}
}
}
}
JOINT leftUpperLeg
{
OFFSET -1 -1.5 0
CHANNELS 3 Zrotation Yrotation Xrotation
JOINT leftLowerLeg
{
OFFSET 0 -1.2 0
CHANNELS 3 Zrotation Yrotation Xrotation
JOINT leftFoot
{
OFFSET 0 0 0.3
CHANNELS 3 Zrotation Yrotation Xrotation
}
}
}
JOINT rightUpperLeg
{
OFFSET 1 -1.5 0
CHANNELS 3 Zrotation Yrotation Xrotation
JOINT rightLowerLeg
{
OFFSET 0 -1.2 0
CHANNELS 3 Zrotation Yrotation Xrotation
JOINT rightFoot
{
OFFSET 0 0 0.3
CHANNELS 3 Zrotation Yrotation Xrotation
}
}
}
}