1. json-lib是一個java類庫,提供將Java對象,包括beans, maps, collections, java arrays and XML等轉換成JSON,或者反向轉換的功能。 java
2. json-lib 主頁 : http://json-lib.sourceforge.net/ apache
3.執行環境 json
須要如下類庫支持 數組
4.功能示例 this
這裏經過JUnit-Case例子給出代碼示例 .net
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 { /* * 普通類型、List、Collection等都是用JSONArray解析 * * Map、自定義類型是用JSONObject解析 * 能夠將Map理解成一個對象,裏面的key/value對能夠理解成對象的屬性/屬性值 * 即{key1:value1,key2,value2......} * * 1.JSONObject是一個name:values集合,經過它的get(key)方法取得的是key後對應的value部分(字符串) * 經過它的getJSONObject(key)能夠取到一個JSONObject,--> 轉換成map, * 經過它的getJSONArray(key) 能夠取到一個JSONArray , * * */ //通常數組轉換成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] } //Collection對象轉換成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"] } //字符串json轉換成json, 根據狀況是用JSONArray或JSONObject @Test public void testJsonStrToJSON(){ JSONArray jsonArray = JSONArray.fromObject( "['json','is','easy']" ); System.out.println( jsonArray ); // prints ["json","is","easy"] } //Map轉換成json, 是用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 ); } //複合類型bean轉成成json @Test public void testBeadToJSON(){ MyBean bean = new MyBean(); bean.setId("001"); bean.setName("銀行卡"); bean.setDate(new Date()); List cardNum = new ArrayList(); cardNum.add("農行"); cardNum.add("工行"); cardNum.add("建行"); cardNum.add(new Person("test")); bean.setCardNum(cardNum); JSONObject jsonObject = JSONObject.fromObject(bean); System.out.println(jsonObject); } //普通類型的json轉換成對象 @Test public void testJSONToObject() throws Exception{ String json = "{name=\"json\",bool:true,int:1,double:2.2,func:function(a){ return a; },array:[1,2]}"; 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); } } //將json解析成複合類型對象, 包含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()); } } } //將json解析成複合類型對象, 包含Map @Test public void testJSONToBeanHavaMap(){ //把Map當作一個對象 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); //使用暗示,直接將json解析爲指定自定義對象,其中List徹底解析,Map沒有徹底解析 MyBeanWithPerson diyBean = (MyBeanWithPerson)JSONObject.toBean(JSONObject.fromObject(json),MyBeanWithPerson.class , classMap); System.out.println(diyBean); System.out.println("do the list release"); List<Person> list = diyBean.getList(); for(Person o : list){ Person p = (Person)o; System.out.println(p.getName()); } System.out.println("do the map release"); //先往註冊器中註冊變換器,須要用到ezmorph包中的類 MorpherRegistry morpherRegistry = JSONUtils.getMorpherRegistry(); Morpher dynaMorpher = new BeanMorpher( Person.class, morpherRegistry); morpherRegistry.registerMorpher( dynaMorpher ); Map map = diyBean.getMap(); /*這裏的map沒進行類型暗示,故按默認的,裏面存的爲net.sf.ezmorph.bean.MorphDynaBean類型的對象*/ System.out.println(map); /*輸出: {testOne=net.sf.ezmorph.bean.MorphDynaBean@f73c1[ {name=test1} ], testTwo=net.sf.ezmorph.bean.MorphDynaBean@186c6b2[ {name=test2} ]} */ List<Person> output = new ArrayList(); for( Iterator i = map.values().iterator(); i.hasNext(); ){ //使用註冊器對指定DynaBean進行對象變換 output.add( (Person)morpherRegistry.morph( Person.class, i.next() ) ); } for(Person p : output){ System.out.println(p.getName()); /*輸出: test1 test2 */ } } }
5.下面提供上面例子所需的資源,包括jar包和代碼 code