Generic multilayer JSON recursive parsing, used directly from the JSON hierarchy: the base node. Child node. Grandchild node.

package com.matol.utils;import java.io.inputstream;import java.util.arraylist;import  java.util.iterator;import java.util.linkedhashmap;import java.util.list;import java.util.map; import java.util.properties;import org.codehaus.jackson.map.objectmapper;/**  *    General-Purpose multilayer JSON recursive parsing. Mainly in the absence of object objects, or extremely complex multilevel nested JSON, the case can be in the way of a class, directly get the desired results.  *   supports data acquisition  *   usage of four returned objects in string, Map, ArrayList, Arraymap: Direct use based on JSON hierarchy:  The base node. Child nodes. Sun Node  *   @author  ww */public class jsonutil {private static  String jsonStr =  "{\" api\ ": \" 2.1\ ", \" message\ ": [\" product \ ", \" tokken\ "],\" request\ ": {\" ptype\ " : \ "Jk\", \ "tokken\": \ "a#dadsfkiwi239sdls#dsd\"},\ "response\": {\ "status\": {\ "statuscode\": \ "500\", \ " statusmessage\ ": [\" Product type error \ ", \" Tokken invalid \ "]},\" page\ ": {\" pagesize\ ": \" 100\ ", \" pageindex\ ": \" 1\ "},\" data\ ": {\" Ptitle\ ": \" All product lists\ ", \" sdate\ ": \" 2014-12-01\ ", \" edate\ ": \" 2016-12-01\ ", \" productlist\ ": [{\" pid\ ": \" ra001\ ", \" pname\ ": \" Product 1\ "},{\" pid\ ": \" ra002\ ", \" pname\ ": \" Product 2\ "}]}},\" Args\ ": [{\" tit\ ": \" ra001\ ", \" val\ ": \" Product 1\ "},{\" tit\ ": \" ra002\ ", \" val\ ": \" Product 2\ "}]}";p rivate static  Objectmapper mapper = new objectmapper ();p Ublic static void main (String[]  args)  throws exception {//test obtains object objects through JSON//object obj = getobjectbyjson (Jsonstr, "Response.data.ptitle", typeenum.string);  //hierarchy recursive String//system.out.println ("API:" +obj.tostring ()) ;//object obj = getobjectbyjson (Jsonstr, "Response.page", Typeenum.map);   //hierarchy Recursive map// System.out.println ("API:" +obj.tostring () + ((Map) obj). Get ("pageSize"));//test Objectz turn json/*map mappars =  new hashmap (); Mappars.put ("Agentcode",  "SH0001"); Mappars.put ("Date",  "2014-01-10"); Mappars.put ("url",  "http://www.map.com/maps.jsp?tag=2"); Map mapargs = new hashmap (); Mapargs.put ("Query", &NBSp;mappars); Map maps = new hashmap (); Maps.put ("Request",  mapargs); Maps.put ("Date",  " 2014-10-10 "); System.out.println (Getobjectbyjson (MAPS)) *///test JSON-level recursive display effect Map maps = mapper.readvalue (jsonstr ,  map.class); Viewjsontree (maps);} /**  complex nested map to Json  */public static string getobjectbyjson (Object obj) {String  str =  ""; try {str = mapper.writevalueasstring (obj);}  catch  (exception e)  {system.out.println ("###[error] getobjecttojson ()  " + E.getmessage ());} Return str;} /**  complex nested JSON-level display   */public static object viewjsontree (object m) {if (m = = null) { system.out.println ("over ..."); return false;} try {map mp = null; List ls = null;if (m instanceof map | |  m instanceof linkedhashmap) {mp =  (linkedhashmap) m;for (Iterator ite =  MP.entryset (). iterator ();  ite.hasnext ();) {  map.entry e =  (map.entry)   Ite.next ();   if (E.getvalue ()  instanceof string) {System.out.println ("[String]" +e.getkey () + "  |  " + e.getvalue ());} Else if (E.getvalue ()  instanceof linkedhashmap) {System.out.println ("{Map}" + e.getkey () + "  |  "+e.getvalue ()); Viewjsontree ((Linkedhashmap) e.getvalue ());} Else if (E.getvalue ()  instanceof arraylist) {System.out.println ("[Array]" + e.getkey () + "  |  "+e.getvalue ()); Viewjsontree ((ArrayList) e.getvalue ());}}   }if (m instanceof list | |  m instanceof arraylist) {ls =  (ArrayList) m;for (Int i=0;i<ls.size (); i++) {if ( Ls.get (i)  instanceof linkedhashmap) {Viewjsontree ((linkedhashmap) ls.get (i));} Else if (Ls.get (i)  instanceof arraylist) {Viewjsontree ((ArrayList) ls.get (i));}}} System.out.println ();}  catch  (Exception e)  {system.out.println ("###[error] viewjsontree ()  " +e.getmessage ());} Return null;} private int i = 0;/**  complex nested JSON gets Object data   */public Object  Getobjectbyjson (String jsonstr,string argspath,typeenum argstype) {if (argsPath == null  | |  argspath.equals ("")  | |  argstype == null) {return null;} Object obj = null;try {map maps = mapper.readvalue (JsonStr, Map.class) ;//Multilayer Get if (Argspath.indexof (".")  >= 0) {//Type Adaptive obj = getobject (Maps,argspath,argstype);} else{ //first layer gets if (argstype == typeenum.string) {obj = maps.get (Argspath). toString ();} Else if (ARGSTYPE&NBSP;==&NBSP;TYPEENUM.MAP) {obj =  (map) maps.get (Argspath);} Else if (argstype == typeenum.arraylist) {obj =  (List) maps.get (ArgsPath);} Else if (Argstype == typeenum.arraymap) {obj =  (LIST&LT map>) Maps.get (Argspath);}}  catch  (exception e)  {system.out.println ("###[error] getobjectbyjson ()  " + E.getmessage ());} I = 0;return obj;} Recursion gets Objectprivate object getobject (Object m,string key,typeenum type) {if (m ==  null) {return null;} object o = null; map mp = null; list ls = null;try {//Object-level recursive traversal parsing if (m instanceof map | |  m instanceof linkedhashmap) {mp =  (linkedhashmap) m;for (Iterator ite =  Mp.entryset (). iterator ();  ite.hasnext ();) {  map.entry e =  (map.entry)   Ite.next ();   if (i<key.split ("\ \"). Length && e.getkey (). Equals (Key.split ("\ \") [i])) {i++;if (E.getvalue ()  instanceof string) {if (i== key.split ("\ \."). Length) {o = e.getvalue (); return o;}} Else if (E.getvalue ()  instanceof linkedhashmap) {if (i== key.split ("\ \"). Length) {if (Type == typeenum.map) {o =  (Linkedhashmap) e.getvalue (); return o;}} Else{o = getobject ((Linkedhashmap) E.getvalue (), key,type);} Return o;} Else if (E.getvalue ()  instanceof arraylist) {if (i== key.split ("\ \"). Length) {if (type == typeenum.arraylist) {o =  (arrayList) e.getvalue (); Return o;} if (type == typeenum.arraymap) {o =  (arraylist<map>) e.getvalue (); return o;}} Else{o = getobject ((ArrayList) E.getvalue (), key,type);} Return o;}}}   }//array-level recursive traversal parsing if (m instanceof list | |  m instanceof arraylist) {ls =  (ArrayList) m;for (Int i=0;i<ls.size (); i++) {if ( Ls.get (i)  instanceof linkedhashmap) {if (i== key.split ("\ \"). Length) {if (Type == typeenum.map) {o =  (linkedhashmap) ls.get (i); return o;}} Else{o = getobject ((linkedhashmap) ls.get (i), key,type);} Return&nBsp;o;} Else if (Ls.get (i)  instanceof arraylist) {if (i== key.split ("\ \"). Length) {if (type == typeenum.arraylist) {o =  (arrayList) ls.get (i); return o;} if (type == typeenum.arraymap) {o =  (arraylist<map>) ls.get (i); return o;}} Else{o = getobject ((ArrayList) ls.get (i), key,type);} Return o;}}}}  catch  (exception e)  {system.out.println ("###[error] getobject ()  " +e.getmessage ( ));} Return o;} /* * json Data parsing return data type enumeration  */public enum TypeEnum{/**  simple key-value pair, get valus */by key         string,        /**   Get to the Map object via key  */        map,         /**  get to ArrayList array via key  */         arraylist,        /**  via key for ARRaymap array object  */        arraymap;    }} 

Generic multilayer JSON recursive parsing, used directly from the JSON hierarchy: the base node. Child node. Grandchild node.