Use json-lib for conversion between Java and JSON

1. json-lib is a java class library that provides the ability to convert Java objects, including beans, maps, collections, java arrays and XML, to JSON or reverse conversion.

2. json-lib home page: http://json-lib.sourceforge.net/

3. Execution Environment

The following class libraries are required

• Jakarta commons-lang 2.5
• Jakarta commons-beanutils 1.8.0
• Jakarta commons-collections 3.2.1
• Jakarta commons-logging 1.1.1
• Ezmorph 1.0.6

  4. Function example

  Here we use the JUnit-Case example to show the sample code.

  Package com. mai. json; import static org. junit. assert. assertEquals; import java. util. arrayList; import java. util. date; import java. util. hashMap; import java. util. iterator; import java. util. list; import java. util. map; import net. sf. ezmorph. morpher; import net. sf. ezmorph. morpherRegistry; import net. sf. ezmorph. bean. beanMorpher; import net. sf. json. JSONArray; import net. sf. json. JSONObject; import net. sf. json. util. JSONUtils; import org. apache. commons. beanutils. propertyUtils; import org. junit. test; public class JsonLibTest {/** common type, List, Collection, etc. are all parsed using JSONArray ** Map, custom type is parsed using JSONObject * Map can be understood as an object, the key/value pair can be understood as the property/attribute value * of the object, that is, {key1: value1, key2, value2 ......} ** 1. JSONObject is a name: values set. The get (key) method obtains the value part (string) corresponding to the key * through its getJSONObject (key) you can get a JSONObject, --> to map, * through its getJSONArray (key), you can get a JSONArray, * ** // convert a general array to JSON @ Test public void testArrayToJSON () {boolean [] boolArray = new boolean [] {true, false, true }; JSONArray jsonArray = JSONArray. fromObject (boolArray); System. out. println (jsonArray); // prints [true, false, true]} // convert the Collection object to JSON @ Test public void testListToJSON () {List list = new ArrayList (); list. add ("first"); list. add ("second"); JSONArray jsonArray = JSONArray. fromObject (list); System. out. println (jsonArray); // prints ["first", "second"]} // converts the string json to json. Use JSONArray or JSONObject @ Test public void testJsonStrToJSON () based on the situation () {JSONArray jsonArray = JSONArray. fromObject ("['json', 'is ', 'easy']"); System. out. println (jsonArray); // prints ["json", "is", "easy"]} // Map is converted to json, which uses jsonObject @ Test public void testMapToJSON () {Map map = new HashMap (); map. put ("name", "json"); map. put ("bool", Boolean. TRUE); map. put ("int", new Integer (1); map. put ("arr", new String [] {"a", "B"}); map. put ("func", "function (I) {return this. arr [I];} "); JSONObject jsonObject = JSONObject. fromObject (map); System. out. println (jsonObject);} // convert the composite bean to json @ Test public void testBeadToJSON () {MyBean bean = new MyBean (); bean. setId ("001"); bean. setName ("bank card"); bean. setDate (new Date (); List cardNum = new ArrayList (); cardNum. add ("ABC"); cardNum. add ("ICBC"); cardNum. add (""); cardNum. add (new Person ("test"); bean. setCardNum (cardNum); JSONObject jsonObject = JSONObject. fromObject (bean); System. out. println (jsonObject);} // convert a common json type to an object @ Test public void testJSONToObject () throws Exception {String json = "{name = \" json \ ", bool: true, int: 1, double: 2.2, func: function (a) {return a ;}, array: []} "; JSONObject jsonObject = JSONObject. fromObject (json); System. out. println (jsonObject); Object bean = JSONObject. toBean (jsonObject); assertEquals (jsonObject. get ("name"), PropertyUtils. getProperty (bean, "name"); assertEquals (jsonObject. get ("bool"), PropertyUtils. getProperty (bean, "bool"); assertEquals (jsonObject. get ("int"), PropertyUtils. getProperty (bean, "int"); assertEquals (jsonObject. get ("double"), PropertyUtils. getProperty (bean, "double"); assertEquals (jsonObject. get ("func"), PropertyUtils. getProperty (bean, "func"); System. out. println (PropertyUtils. getProperty (bean, "name"); System. out. println (PropertyUtils. getProperty (bean, "bool"); System. out. println (PropertyUtils. getProperty (bean, "int"); System. out. println (PropertyUtils. getProperty (bean, "double"); System. out. println (PropertyUtils. getProperty (bean, "func"); System. out. println (PropertyUtils. getProperty (bean, "array"); List arrayList = (List) JSONArray. toCollection (jsonObject. getJSONArray ("array"); for (Object object: arrayList) {System. out. println (object) ;}// parses json into a composite object, including List @ Test public void testJSONToBeanHavaList () {String json = "{list: [{name: 'test1'}, {name: 'test2'}], map: {test1: {name: 'test1'}, test2: {name: 'test2 '}}}"; // String json = "{list: [{name: 'test1'}, {name: 'test2'}]}"; Map classMap = new HashMap (); classMap. put ("list", Person. class); MyBeanWithPerson diyBean = (MyBeanWithPerson) JSONObject. toBean (JSONObject. fromObject (json), MyBeanWithPerson. class, classMap); System. out. println (diyBean); List list = diyBean. getList (); for (Object o: list) {if (o instanceof Person) {Person p = (Person) o; System. out. println (p. getName () ;}}// parse json into a composite object, including Map @ Test public void testJSONToBeanHavaMap () {// regard Map as a String json = "{list: [{name: 'test1'}, {name: 'test2'}], map: {testOne: {name: 'test1'}, testTwo: {name: 'test2' }}} "; Map classMap = new HashMap (); classMap. put ("list", Person. class); classMap. put ("map", Map. class); // usage suggestion: json is directly parsed as a specified custom object, in which List is completely parsed, and Map is not completely parsed as MyBeanWithPerson diyBean = (MyBeanWithPerson) JSONObject. toBean (JSONObject. fromObject (json), MyBeanWithPerson. class, classMap); System. out. println (diyBean); System. out. println ("do the list release"); List
     
      
  List = diyBean. getList (); for (Person o: list) {Person p = (Person) o; System. out. println (p. getName ();} System. out. println ("do the map release"); // register the converter in the register first, and use the class MorpherRegistry morpherRegistry = JSONUtils IN the ezmorph package. getMorpherRegistry (); Morpher dynaMorpher = new BeanMorpher (Person. class, morpherRegistry); morpherRegistry. registerMorpher (dynaMorpher); Map map = diyBean. getMap ();/* the map here does not imply the type, so it is saved as net by default. sf. ezmorph. bean. morphDynaBean object */System. out. println (map);/* output: {testOne = net. sf. ezmorph. bean. morphDynaBean @ f73c1 [{name = test1}], testTwo = net. sf. ezmorph. bean. morphDynaBean @ 186c6b2 [{name = test2}]} */List
      
       
  Output = new ArrayList (); for (Iterator I = map. values (). iterator (); I. hasNext ();) {// use the Register to perform object conversion for the specified DynaBean. output. add (Person) morpherRegistry. morph (Person. class, I. next ();} for (Person p: output) {System. out. println (p. getName ();/* output: test1 test2 */}}}
      
     

  
  5. The following provides the resources required for the preceding example, including the jar package and code.
  /Files/mailingfeng/json-lib/json-libuse case jarpack and Java class .rar