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如何使用json-lib实现Java和JSON之间的转换2014-08-30 csdn博客 袭烽1. json-lib是一个java类库,提供将Java对象,包括beans, maps, collections, java arrays and XML等转换成JSON,或者反向转换的功能。

2. json-lib 主页 : http://json-lib.sourceforge.net/

3.执行环境

需要以下类库支持

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.功能示例

这里通过JUnit-Case例子给出代码示例

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 {/**普通类型、List、Collection等都是用JSONArray解析**Map、自定义类型是用JSONObject解析*可以将Map理解成一个对象,里面的key/value对可以理解成对象的属性/属性值*即{key1:value1,key2,value2......}* * 1.JSONObject是一个name:values集合,通过它的get(key)方法取得的是key后对应的value部分(字符串)* 通过它的getJSONObject(key)可以取到一个JSONObject,--> 转换成map,* 通过它的getJSONArray(key) 可以取到一个JSONArray ,* * *///一般数组转换成JSON@Testpublic void testArrayToJSON(){boolean[] boolArray = new boolean[]{true,false,true};JSONArray jsonArray = JSONArray.fromObject( boolArray );System.out.println( jsonArray );// prints [true,false,true]}//Collection对象转换成JSON@Testpublic 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转换成json, 根据情况是用JSONArray或JSONObject@Testpublic void testJsonStrToJSON(){JSONArray jsonArray = JSONArray.fromObject( "["json","is","easy"]" );System.out.println( jsonArray );// prints ["json","is","easy"]}//Map转换成json, 是用jsonObject@Testpublic 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 );}//复合类型bean转成成json@Testpublic void testBeadToJSON(){MyBean bean = new MyBean();bean.setId("001");bean.setName("银行卡");bean.setDate(new Date());List cardNum = new ArrayList();cardNum.add("农行");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);}//普通类型的json转换成对象@Testpublic 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);}}//将json解析成复合类型对象, 包含List@Testpublic 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());}}}//将json解析成复合类型对象, 包含Map@Testpublic void testJSONToBeanHavaMap(){//把Map看成一个对象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,直接将json解析为指定自定义对象,其中List完全解析,Map没有完全解析// 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");//先往注册器中注册变换器,需要用到ezmorph包中的类MorpherRegistry morpherRegistry = JSONUtils.getMorpherRegistry();Morpher dynaMorpher = new BeanMorpher( Person.class,morpherRegistry);morpherRegistry.registerMorpher( dynaMorpher );Map map = diyBean.getMap();/*这里的map没进行类型暗示,故按默认的,里面存的为net.sf.ezmorph.bean.MorphDynaBean类型的对象*/System.out.println(map);      /*输出:         {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(); ){//使用注册器对指定DynaBean进行对象变换 output.add( (Person)morpherRegistry.morph( Person.class, i.next() ) );}for(Person p : output){System.out.println(p.getName());        /*输出:           test1           test2         */}}}
5.下面提供上面例子所需的资源,包括jar包和代码

/Files/mailingfeng/json-lib/json-lib用例所需jar包和java类.rar

http://download.csdn.net/detail/shimiso/7058455