Conversion between JSON strings and Java objects

Jsonlib classic article: http://json-lib.sourceforge.net/xref-test/net/sf/json/TestJSONObject.html

// Introduce the corresponding package

// Json-lib-2.2-jdk15.jar

Import net. SF. JSON. jsonarray;
Import net. SF. JSON. jsonobject;

1. // convert the Java object list to a JSON object array and convert it to a string

    Jsonarray array = jsonarray. fromobject (userlist );
    String jsonstr = array. tostring ();

2. // convert a Java object to a JSON object and convert it to a string

  Jsonobject object = jsonobject. fromobject (invite );
  Log4jinit. ysulogger. debug (object. tostring ());

3. // convert the JSON string into a Java object Array

 String personstr = getrequest (). getparameter ("persons ");
  Jsonarray JSON = jsonarray. fromobject (personstr );
  List <invoidperson> Persons = (list <invoidperson>) jsonarray. tocollection (JSON, nvoidperson. Class );
4. // convert a JSON string to a Java object

 STR = "{\" lendperson \ ": \" Li Si \ ", \" lendcompany \ ": \" Company Limited \ ", \" checkperson \": \ "Li Si \",
  \ "Lenddate \": \ "2010-07-19t00: 00: 00 \", \ "lendcounts \": 4 ,\"
  Passports \ ": [{\" passportid \ ": \" d \ ", \" Name \ ": \" Li yuchuan \ ", \" passporttype \": \ "k \"},
  {\ "Passportid \": \ "k9051 \", \ "Name \": \ "Li Ping \", \ "passporttype \": \ "k \"},
  {\ "Passportid \": \ "k90517 \", \ "Name \": \ "Yuan hanmei \", \ "passporttype \": \ "k \"},
  {\ "Passportid \": \ "k905199 \", \ "Name \": \ "He Ming \", \ "passporttype \": \ "k \"}]} ";
   Jsonobject = jsonobject. fromobject (STR );
  Passportlendsentity passportlends = NULL;
  Try {
   // Obtain a JSON Array
   Jsonarray array = jsonobject. getjsonarray ("passports ");
   // Convert the JSON array to a list <passportforlendsentity> generic
   List <passportforlendsentity> List = new arraylist <passportforlendsentity> ();
   For (INT I = 0; I <array. Size (); I ++ ){  
           Jsonobject object = (jsonobject) array. Get (I ); 
           Passportforlendsentity passport = (passportforlendsentity) jsonobject. tobean (object,
           Passportforlendsentity. Class );
           If (passport! = NULL ){
          List. Add (passport );
           } 
        }
   // Convert the passportlendsentity object class
   Passportlends = (passportlendsentity) jsonobject. tobean (jsonobject, passportlendsentity. Class );