Ason and Java Object conversion examples

1. Engineering

2. Code:

Jsonutil.java

Package Com.my.json;import Java.util.arraylist;import Java.util.list;import net.sf.json.jsonarray;import             Net.sf.json.jsonobject;public class Jsonutil {/** * Gets a Java object from a JSON object character format * * @param jsonstring * JSON String * * @param POJOCALSS * Java Object class * * @return * * Public stat        IC Object Jsonstring2object (String jsonstring, Class pojocalss) {object Pojo;        Jsonobject jsonobject = Jsonobject.fromobject (jsonstring);        Pojo = Jsonobject.tobean (Jsonobject, POJOCALSS);    return Pojo;      /** * * Convert Java objects to JSON strings <br> * Support complex types: Java beans have both properties and list * * @param javaobj *        * @return */public static String object2jsonstring (Object javaobj) {jsonobject json;        JSON = Jsonobject.fromobject (javaobj);    return json.tostring (); /** * * Get a list of Java objects from the JSON object collection expression * * @param jsonstring * * @param pojoclass *     * @return */public static List jsonlist2javalist (String jsonstring, Class pojoclass) {Jsonarray Jsona        Rray = Jsonarray.fromobject (jsonstring);        Jsonobject Jsonobject;        Object Pojovalue;        List List = new ArrayList ();            for (int i = 0; i < jsonarray.size (); i++) {jsonobject = Jsonarray.getjsonobject (i);            Pojovalue = Jsonobject.tobean (Jsonobject, Pojoclass);        List.add (Pojovalue);    } return list; /** * * Get a list of Java objects from the JSON object collection expression * * @param jsonstring * * @param pojoclass * * @return */public static String javalist2jsonlist (List list) {Jsonarray Jsonarray = Jsonarray.fromobject (li        ST);    return jsonarray.tostring (); }

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publicstaticMap<String, Object> parseJSON2Map(String jsonStr){          Map<String, Object> map = newHashMap<String, Object>();          //最外层解析          JSONObject json = JSONObject.fromObject(jsonStr);          for(Object k : json.keySet()){              Object v = json.get(k);               //如果内层还是数组的话，继续解析              if(v instanceof JSONArray){                  List<Map<String, Object>> list = newArrayList<Map<String,Object>>();                  Iterator<JSONObject> it = ((JSONArray)v).iterator();                  while(it.hasNext()){                      JSONObject json2 = it.next();                      list.add(parseJSON2Map(json2.toString()));                  }                  map.put(k.toString(), list);              } else{                  map.put(k.toString(), v);              }          }          return map;      }

　　

}

Person.java

Package Com.my.json;import Java.util.arraylist;import Java.util.list;public class Person {private String name;    Private list<person> List = new arraylist<person> ();    Public list<person> getList () {return List;    } public void setlist (list<person> list) {this.list = list;                } @Override Public String toString () {return ' person [name= + name + ', num= "+ num +", sex= "+ Sex    + ", age=" + Age + "]";    } private int num;    Private String sex;    private int age; Public person () {//TODO auto-generated constructor stubs} public person (string name, int num, string sex, I        NT age) {super ();        THIS.name = name;        This.num = num;        This.sex = sex;    This.age = age;    } public String GetName () {return name;    } public void SetName (String name) {this.name = name;    } public int Getnum () {return num; } public void setnum (int num) {this.num = num;    } public String Getsex () {return sex;    public void Setsex (String sex) {this.sex = sex;    } public int Getage () {return age;    public void Setage (int.) {this.age = age; }}

Test.java

Package Com.my.json;import Java.util.arraylist;import Java.util.list;import java.util.map;import        Net.sf.json.jsonobject;public class Test {public static void main (string[] args) {//Convert a Java object to a JSON string        Person p = new person ("GU1", 123, "male", 23);        String str = jsonutil.object2jsonstring (p);        System.out.println (str);        Convert a JSON string to a Java object string s = "{\" age\ ": 23,\" name\ ": \" gu1\ ", \" num\ ": 123,\" sex\ ": \" Male\ "}";        person P2 = (person) jsonutil.jsonstring2object (s, person.class);        System.out.println (p2);        Converts an object list to a JSON list list<person> list = new arraylist<person> ();            for (int i = 0; i < 5; i++) {Person persion = new Person ("Zhang" + i, 1 + i, "man" + I, 1 + i);        List.add (persion);        } String jsonlist = jsonutil.javalist2jsonlist (list);        System.out.println (jsonlist); Convert a JSON list to a Java list String jst = "[{\" age\ ": 1,\" list\ ": [],\" name\ ": \" Zhang0\ ", \" num\ ": 1,\" sex\ ": \" man0\ "},{\" age\ ": 2,\" list\ ": [],\" name\ ": \" zhang1\ ", \" num\ ": 2,\" sex\ ": \" man1\ "},{\" age\ " : 3,\ "list\": [],\ "name\": \ "zhang2\", \ "num\": 3,\ "sex\": \ "man2\"},{\ "age\": 4,\ "list\": [],\ "name\": \ "zhang3\", \ "        Num\ ": 4,\" sex\ ": \" man3\ "},{\" age\ ": 5,\" list\ ": [],\" name\ ": \" zhang4\ ", \" num\ ": 5,\" sex\ ": \" Man4\ "}]";        list<person> L = (list<person>) jsonutil.jsonlist2javalist (JST, Person.class);        System.out.println (L.size ());        Complex type to Json:java Bean has both attributes and list (often seen in the project) list<person> List2 = new arraylist<person> ();            for (int i = 0; i < i++) {person persion = new Person ("Zhang" + i, 1 + i, "man" + I, 1 + i);        List2.add (persion);        } Person me = new Person ("Zhang", 1, "Man", 1);        Me.setlist (LIST2);        String str2 = jsonutil.object2jsonstring (Me);        System.out.println (STR2); Complex Type Java:json has both attributes and list (often seen in the project) String ss = "{\" age\ ": 1,\" list\ ": [{\" AGE\ ": 1,\" list\ ": [],\" name\ ": \" zhang0\ ", \" num\ ": 1,\" sex\ ": \" man0\ "},{\" age\ ": 2,\" list\ ": [],\" name\ ": \" zhang1\ ", \ "Num\": 2,\ "sex\": \ "man1\"},{\ "age\": 3,\ "list\": [],\ "name\": \ "zhang2\", \ "num\": 3,\ "sex\": \ "man2\"},{\ "age\": 4,\ "List\": [],\ "name\": \ "zhang3\", \ "num\": 4,\ "sex\": \ "man3\"},{\ "age\": 5,\ "list\": [],\ "name\": \ "zhang4\", \ "Num\" : 5,\ "sex\": \ "man4\"},{\ "age\": 6,\ "list\": [],\ "name\": \ "zhang5\", \ "num\": 6,\ "sex\": \ "man5\"},{\ "age\": 7,\ "list\ ": [],\" name\ ": \" zhang6\ ", \" num\ ": 7,\" sex\ ": \" man6\ "},{\" age\ ": 8,\" list\ ": [],\" name\ ": \" zhang7\ ", \" num\ ": 8,\" Sex\ ": \" man7\ "},{\" age\ ": 9,\" list\ ": [],\" name\ ": \" zhang8\ ", \" num\ ": 9,\" sex\ ": \" man8\ "},{\" age\ ": 10,\" list\ ": []        , \ "name\": \ "zhang9\", \ "num\": 10,\ "sex\": \ "man9\"}],\ "name\": \ "zhang\", \ "num\": 1,\ "sex\": \ "man\"} ";                 Map map = (map) jsonobject.fromobject (ss);        System.out.println ("------------------------------");        SYSTEM.OUT.PRINTLN (map);        String name = (string) map.get ("name");      int num = (Integer) map.get ("num");  String sex = (string) map.get ("Sex");        int age = (Integer) map.get ("Age");        System.out.println ("name=" +name);        System.out.println ("num=" + "num");        System.out.println ("sex=" + "sex");        System.out.println ("age=" + "Age");        System.out.println ("list=" +map.get ("List")); Getting the list string, and then converting it to a Java object, is actually built again into Java bean string liststr = Map.get ("list"). ToString ();//must use ToString, not strong to Li        st<person> ll = jsonutil.jsonlist2javalist (Liststr, Person.class);        Build a new bean: I don't know if there are any other scenarios, whether or not to build the person PP = new person (name,num,sex,age);        Pp.setlist (LL);        Output bean for (person ps:pp.getList ()) {System.out.println (Ps.getname ()); }                }}

Output:

{"Age": $, "list": [], "name": "GU1", "num": 123, "sex": "Male"}
person [Name=gu1, num=123, Sex=male, age=23]
[{"Age": 1, "list": [], "name": "ZHANG0", "num": 1, "Sex": "Man0"},{"Age": 2, "list": [], "name": "Zhang1", "num": 2, "Sex": " Man1 "},{": 3, "list": [], "name": "Zhang2", "num": 3, "Sex": "Man2"},{"Age": 4, "list": [], "name": "Zhang3", "num": 4, " Sex ":" Man3 "},{" Age ": 5," list ": []," name ":" Zhang4 "," num ": 5," Sex ":" Man4 "}]
5
{"Age": 1, "list": [{' Age ': 1, "list": [], "name": "ZHANG0", "num": 1, "Sex": "Man0"},{"Age": 2, "list": [], "name": "Zhang1", " Num ": 2," Sex ":" Man1 "},{" Age ": 3," list ": []," name ":" Zhang2 "," num ": 3," Sex ":" Man2 "},{" Age ": 4," list ": []," name ":" Zhang3 "," num ": 4," Sex ":" Man3 "},{" Age ": 5," list ": []," name ":" Zhang4 "," num ": 5," Sex ":" Man4 "},{" Age ": 6," list ": []," Name ":" Zhang5 "," num ": 6," Sex ":" Man5 "},{" Age ": 7," list ": []," name ":" Zhang6 "," num ": 7," Sex ":" Man6 "},{" age ": 8," list ": [], "name": "Zhang7", "num": 8, "Sex": "Man7"},{"Age": 9, "list": [], "name": "Zhang8", "num": 9, "Sex": "Man8"},{"age": 10, " List ": []," name ":" ZHANG9 "," num ": Ten," Sex ":" Man9 "}]," name ":" Zhang "," num ": 1," Sex ":" Man "}
------------------------------
{"Age": 1, "list": [{' Age ': 1, "list": [], "name": "ZHANG0", "num": 1, "Sex": "Man0"},{"Age": 2, "list": [], "name": "Zhang1", " Num ": 2," Sex ":" Man1 "},{" Age ": 3," list ": []," name ":" Zhang2 "," num ": 3," Sex ":" Man2 "},{" Age ": 4," list ": []," name ":" Zhang3 "," num ": 4," Sex ":" Man3 "},{" Age ": 5," list ": []," name ":" Zhang4 "," num ": 5," Sex ":" Man4 "},{" Age ": 6," list ": []," Name ":" Zhang5 "," num ": 6," Sex ":" Man5 "},{" Age ": 7," list ": []," name ":" Zhang6 "," num ": 7," Sex ":" Man6 "},{" age ": 8," list ": [], "name": "Zhang7", "num": 8, "Sex": "Man7"},{"Age": 9, "list": [], "name": "Zhang8", "num": 9, "Sex": "Man8"},{"age": 10, " List ": []," name ":" ZHANG9 "," num ": Ten," Sex ":" Man9 "}]," name ":" Zhang "," num ": 1," Sex ":" Man "}
Name=zhang
Num=num
Sex=sex
Age=age
List=[{"Age": 1, "list": [], "name": "ZHANG0", "num": 1, "Sex": "Man0"},{"Age": 2, "list": [], "name": "Zhang1", "num": 2, "sex ":" Man1 "},{" Age ": 3," list ": []," name ":" Zhang2 "," num ": 3," Sex ":" Man2 "},{" Age ": 4," list ": []," name ":" Zhang3 "," num ": 4, "Sex": "Man3"},{"Age": 5, "list": [], "name": "Zhang4", "num": 5, "Sex": "Man4"},{"Age": 6, "list": [], "name": "Zhang5", "num ": 6," Sex ":" Man5 "},{" Age ": 7," list ": []," name ":" Zhang6 "," num ": 7," Sex ":" Man6 "},{" age ": 8," list ": []," name ":" Zhang7 ", "Num": 8, "Sex": "Man7"},{"Age": 9, "list": [], "name": "Zhang8", "num": 9, "Sex": "Man8"},{"age": Ten, "List": [], "name": " ZHANG9 "," num ": Ten," Sex ":" Man9 "}]
Zhang0
Zhang1
Zhang2
Zhang3
Zhang4
Zhang5
Zhang6
Zhang7
Zhang8
Zhang9

Ason and Java Object conversion examples