JSON-lib框架，转换JSON、XML不再困难

Json-lib可以将Java对象转成json格式的字符串，也可以将Java对象转换成xml格式的文档，同样可以将json字符串转换成Java对象或是将xml字符串转换成Java对象。

一、 准备工作 

 

1、 首先要去官方下载json-lib工具包

下载地址：

http://sourceforge.net/projects/json-lib/files/json-lib/json-lib-2.4/

目前最新的是2.4的版本，本示例中使用的是v2.3；json-lib还需要以下依赖包：

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

官方网址：http://json-lib.sourceforge.net/

然后在工程中添加如下jar包：

当然你也可以用2.4的json-lib库

你可以在这里看看官方提供的示例：

http://json-lib.sourceforge.net/usage.html

由于本次介绍的示例需要junit工具，所以你还需要添加junit的jar文件，版本是4.8.2版本的，下载地址：https://github.com/KentBeck/junit/downloads

如果你还不了解JSON是什么？那么你应该可以看看http://www.json.org/json-zh.html

2、 要转换的JavaBean的代码如下：

package com.hoo.entity;  public class Student { private int id; private String name; private String email; private String address; private Birthday birthday;  //setter、getter public String toString() { return this.name + "#" + this.id + "#" + this.address + "#" + this.birthday + "#" + this.email; }} 

Birthday.java

package com.hoo.entity;  public class Birthday { private String birthday; public Birthday(String birthday) { super(); this.birthday = birthday; } //setter、getter public Birthday() {} @Override public String toString() { return this.birthday; }}

注意，上面的getter、setter方法省略了，自己构建下。

3、 新建JsonlibTest测试类，基本代码如下：

package com.hoo.test;  import java.lang.reflect.InvocationTargetException; import java.util.ArrayList; import java.util.Collection; import java.util.Date; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Set; import net.sf.json.JSON; import net.sf.json.JSONArray; import net.sf.json.JSONFunction; import net.sf.json.JSONObject; import net.sf.json.JSONSerializer; import net.sf.json.JsonConfig; import net.sf.json.processors.JsonValueProcessor; import net.sf.json.util.PropertyFilter; import net.sf.json.xml.XMLSerializer; import org.apache.commons.beanutils.PropertyUtils; import org.junit.After; import org.junit.Before; import org.junit.Test; import com.hoo.entity.Birthday; import com.hoo.entity.Student;  /** * <b>function:</b> 用json-lib转换java对象到JSON字符串 * 读取json字符串到java对象，序列化jsonObject到xml * json-lib-version: json-lib-2.3-jdk15.jar * 依赖包: * commons-beanutils.jar * commons-collections-3.2.jar * ezmorph-1.0.3.jar * commons-lang.jar * commons-logging.jar * @author hoojo * @createDate Nov 28, 2010 2:28:39 PM * @file JsonlibTest.java * @package com.hoo.test * @project WebHttpUtils * @blog http://blog.csdn.net/IBM_hoojo * @email [email protected] * @version 1.0 */@SuppressWarnings({ "deprecation", "unchecked" }) public class JsonlibTest { private JSONArray jsonArray = null; private JSONObject jsonObject = null; private Student bean = null; @Before public void init() { jsonArray = new JSONArray(); jsonObject = new JSONObject(); bean = new Student(); bean.setAddress( "address"); bean.setEmail( "email"); bean.setId(1); bean.setName( "haha"); Birthday day = new Birthday(); day.setBirthday( "2010-11-22"); bean.setBirthday(day); } @After public void destory() { jsonArray = null; jsonObject = null; bean = null; System.gc(); } public final void fail(String string) { System.out.println(string); } public final void failRed(String string) { System.err.println(string); } }

上面的init会在每个方法之前运行，destory会在每个方法完成后执行。分别用到了junit的@Before、@After注解，如果你对junit的这些注解不是很了解，可以看看junit官方的测试用例的example和doc；

JSONObject是将Java对象转换成一个json的Object形式，JSONArray是将一个Java对象转换成json的Array格式。

那什么是json的Object形式、Array形式？

用通俗易懂的方法将，所谓的json的Object形式就是一个花括号里面存放的如JavaMap的键值对，如：{name:’hoojo’, age: 24}；

那么json的Array形式呢？

就是中括号，括起来的数组。如：[ ‘json’, true, 22]；

如果你还想了解更多json方面的知识，请看：http://www.json.org/json-zh.html

除了上面的JSONArray、JSONObject可以将Java对象转换成JSON或是相反，将JSON字符串转换成Java对象，还有一个对象也可以完成上面的功能，它就是JSONSerializer；下面我们就来看看它们是怎么玩转Java对象和JSON的。

二、 Java对象序列化成JSON对象

1、 将JavaObject转换吃JSON字符串

在JsonlibTest中添加如下代码：

/*=========================Java Object >>>> JSON String ===========================*/ /** * <b>function:</b>转Java Bean对象到JSON * @author hoojo * @createDate Nov 28, 2010 2:35:54 PM */@Test public void writeEntity2JSON() { fail( "==============Java Bean >>> JSON Object=================="); fail(JSONObject.fromObject(bean).toString()); fail( "==============Java Bean >>> JSON Array=================="); fail(JSONArray.fromObject(bean).toString()); //array会在最外层套上[] fail( "==============Java Bean >>> JSON Object =================="); fail(JSONSerializer.toJSON(bean).toString()); fail( "========================JsonConfig========================"); JsonConfig jsonConfig = new JsonConfig(); jsonConfig.registerJsonValueProcessor(Birthday. class, new JsonValueProcessor() { public Object processArrayValue(Object value, JsonConfig jsonConfig) { if (value == null) { return new Date(); } return value; }  public Object processObjectValue(String key, Object value, JsonConfig jsonConfig) { fail( "key:" + key); return value + "##修改过的日期"; }  }); jsonObject = JSONObject.fromObject(bean, jsonConfig); fail(jsonObject.toString()); Student student = (Student) JSONObject.toBean(jsonObject, Student. class); fail(jsonObject.getString( "birthday")); fail(student.toString()); fail( "#####################JsonPropertyFilter############################"); jsonConfig.setJsonPropertyFilter( new PropertyFilter() { public boolean apply(Object source, String name, Object value) { fail(source + "%%%" + name + "--" + value); //忽略birthday属性 if (value != null && Birthday. class.isAssignableFrom(value.getClass())) { return true; } return false; } }); fail(JSONObject.fromObject(bean, jsonConfig).toString()); fail( "#################JavaPropertyFilter##################"); jsonConfig.setRootClass(Student. class); jsonConfig.setJavaPropertyFilter( new PropertyFilter() { public boolean apply(Object source, String name, Object value) { fail(name + "@" + value + "#" + source); if ( "id".equals(name) || "email".equals(name)) { value = name + "@@"; return true; } return false; } }); //jsonObject = JSONObject.fromObject(bean, jsonConfig); //student = (Student) JSONObject.toBean(jsonObject, Student.class); //fail(student.toString()); student = (Student) JSONObject.toBean(jsonObject, jsonConfig); fail( "Student:" + student.toString());}

fromObject将Java对象转换成json字符串，toBean将json对象转换成Java对象；

上面方法值得注意的是使用了JsonConfig这个对象，这个对象可以在序列化的时候对JavaObject的数据进行处理、过滤等

上面的jsonConfig的registerJsonValueProcessor方法可以完成对象值的处理和修改，比如处理生日为null时，给一个特定的值。同样setJsonPropertyFilter和setJavaPropertyFilter都是完成对转换后的值的处理。

运行上面的代码可以在控制台看到如下结果：

==============Java Bean >>> JSON Object=================={ "address": "address", "birthday":{ "birthday": "2010-11-22"}, "email": "email", "id":1, "name": "haha"}==============Java Bean >>> JSON Array==================[{ "address": "address", "birthday":{ "birthday": "2010-11-22"}, "email": "email", "id":1, "name": "haha"}]==============Java Bean >>> JSON Object =================={ "address": "address", "birthday":{ "birthday": "2010-11-22"}, "email": "email", "id":1, "name": "haha"}========================JsonConfig========================key:birthday{ "address": "address", "birthday": "2010-11-22##修改过的日期", "email": "email", "id":1, "name": "haha"}2010-11-22##修改过的日期haha#1#address#null#email#####################JsonPropertyFilter############################haha#1#address#2010-11-22#email%%%address--addresshaha#1#address#2010-11-22#email%%%birthday--2010-11-22haha#1#address#2010-11-22#email%%%email--emailhaha#1#address#2010-11-22#email%%%id--1haha#1#address#2010-11-22#email%%%name--haha{ "address": "address", "email": "email", "id":1, "name": "haha"}#################JavaPropertyFilter##################address@address#null#0#null#null#nullbirthday@2010-11-22##修改过的日期#null#0#address#null#nullemail@email#null#0#address#null#nullid@1#null#0#address#null#nullname@haha#null#0#address#null#nullStudent:haha#0#address#null#null

2、 将JavaList集合转换吃JSON字符串

/** * <b>function:</b>转换Java List集合到JSON * @author hoojo * @createDate Nov 28, 2010 2:36:15 PM */@Test public void writeList2JSON() { fail( "==============Java List >>> JSON Array=================="); List<Student> stu = new ArrayList<Student>(); stu.add(bean); bean.setName( "jack"); stu.add(bean); fail(JSONArray.fromObject(stu).toString()); fail(JSONSerializer.toJSON(stu).toString());}

运行此方法后，可以看到控制台输出：

==============Java List >>> JSON Array==================[{ "address": "address", "birthday":{ "birthday": "2010-11-22"}, "email": "email", "id":1, "name": "jack"},{ "address": "address", "birthday":{ "birthday": "2010-11-22"}, "email": "email", "id":1, "name": "jack"}][{ "address": "address", "birthday":{ "birthday": "2010-11-22"}, "email": "email", "id":1, "name": "jack"},{ "address": "address", "birthday":{ "birthday": "2010-11-22"}, "email": "email", "id":1, "name": "jack"}]

如果你是转换List集合，一定得用JSONArray或是JSONSrializer提供的序列化方法。如果你用JSONObject.fromObject方法转换List会出现异常，通常使用JSONSrializer这个JSON序列化的方法，它会自动识别你传递的对象的类型，然后转换成相应的JSON字符串。

3、 将Map集合转换成JSON对象

/** * <b>function:</b>转Java Map对象到JSON * @author hoojo * @createDate Nov 28, 2010 2:37:35 PM */@Test public void writeMap2JSON() { Map<String, Object> map = new HashMap<String, Object>(); map.put( "A", bean); bean.setName( "jack"); map.put( "B", bean); 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]; }"); fail( "==============Java Map >>> JSON Object=================="); fail(JSONObject.fromObject(map).toString()); fail( "==============Java Map >>> JSON Array =================="); fail(JSONArray.fromObject(map).toString()); fail( "==============Java Map >>> JSON Object=================="); fail(JSONSerializer.toJSON(map).toString());}

上面的Map集合有JavaBean、String、Boolean、Integer、以及Array和js的function函数的字符串。

运行上面的程序，结果如下：

==============Java Map >>> JSON Object=================={ "arr":[ "a", "b"], "A":{ "address": "address", "birthday":{ "birthday": "2010-11-22"}, "email": "email", "id":1, "name": "jack"}, "int":1, "B":{ "address": "address", "birthday":{ "birthday": "2010-11-22"}, "email": "email", "id":1, "name": "jack"}, "name": "json", "func":function(i){ return this.arr[i]; }, "bool":true}==============Java Map >>> JSON Array ==================[{ "arr":[ "a", "b"], "A":{ "address": "address", "birthday":{ "birthday": "2010-11-22"}, "email": "email", "id":1, "name": "jack"}, "int":1, "B":{ "address": "address", "birthday":{ "birthday": "2010-11-22"}, "email": "email", "id":1, "name": "jack"}, "name": "json", "func":function(i){ return this.arr[i]; }, "bool":true}]==============Java Map >>> JSON Object=================={ "arr":[ "a", "b"], "A":{ "address": "address", "birthday":{ "birthday": "2010-11-22"}, "email": "email", "id":1, "name": "jack"}, "int":1, "B":{ "address": "address", "birthday":{ "birthday": "2010-11-22"}, "email": "email", "id":1, "name": "jack"}, "name": "json", "func":function(i){ return this.arr[i]; }, "bool":true}

4、 将更多类型转换成JSON

/** * <b>function:</b> 转换更多数组类型到JSON * @author hoojo * @createDate Nov 28, 2010 2:39:19 PM */@Test public void writeObject2JSON() { String[] sa = { "a", "b", "c"}; fail( "==============Java StringArray >>> JSON Array =================="); fail(JSONArray.fromObject(sa).toString()); fail(JSONSerializer.toJSON(sa).toString()); fail( "==============Java boolean Array >>> JSON Array =================="); boolean[] bo = { true, false, true }; fail(JSONArray.fromObject(bo).toString()); fail(JSONSerializer.toJSON(bo).toString()); Object[] o = { 1, "a", true, 'A', sa, bo }; fail( "==============Java Object Array >>> JSON Array =================="); fail(JSONArray.fromObject(o).toString()); fail(JSONSerializer.toJSON(o).toString()); fail( "==============Java String >>> JSON =================="); fail(JSONArray.fromObject( "['json','is','easy']").toString()); fail(JSONObject.fromObject( "{'json':'is easy'}").toString()); fail(JSONSerializer.toJSON( "['json','is','easy']").toString()); fail( "==============Java JSONObject >>> JSON =================="); jsonObject = new JSONObject() .element( "string", "JSON") .element( "integer", "1") .element( "double", "2.0") .element( "boolean", "true"); fail(JSONSerializer.toJSON(jsonObject).toString()); fail( "==============Java JSONArray >>> JSON =================="); jsonArray = new JSONArray() .element( "JSON" ) .element( "1" ) .element( "2.0" ) .element( "true" ); fail(JSONSerializer.toJSON(jsonArray).toString()); fail( "==============Java JSONArray JsonConfig#setArrayMode >>> JSON =================="); List input = new ArrayList(); input.add( "JSON"); input.add( "1"); input.add( "2.0"); input.add( "true"); JSONArray jsonArray = (JSONArray) JSONSerializer.toJSON( input ); JsonConfig jsonConfig = new JsonConfig(); jsonConfig.setArrayMode( JsonConfig.MODE_OBJECT_ARRAY ); Object[] output = (Object[]) JSONSerializer.toJava(jsonArray, jsonConfig); System.out.println(output[0]); fail( "==============Java JSONFunction >>> JSON =================="); String str = "{'func': function( param ){ doSomethingWithParam(param); }}"; JSONObject jsonObject = (JSONObject) JSONSerializer.toJSON(str); JSONFunction func = (JSONFunction) jsonObject.get( "func"); fail(func.getParams()[0]); fail(func.getText() ); }

运行后结果如下：

==============Java StringArray >>> JSON Array ==================[ "a", "b", "c"][ "a", "b", "c"]==============Java boolean Array >>> JSON Array ==================[true,false,true][true,false,true]==============Java Object Array >>> JSON Array ==================[1, "a",true, "A",[ "a", "b", "c"],[true,false,true]][1, "a",true, "A",[ "a", "b", "c"],[true,false,true]]==============Java String >>> JSON ==================[ "json", "is", "easy"]{ "json": "is easy"}[ "json", "is", "easy"]==============Java JSONObject >>> JSON =================={ "string": "JSON", "integer": "1", "double": "2.0", "boolean": "true"}==============Java JSONArray >>> JSON ==================[ "JSON", "1", "2.0", "true"]==============Java JSONArray JsonConfig#setArrayMode >>> JSON ==================JSON==============Java JSONFunction >>> JSON ==================paramdoSomethingWithParam(param);

这里还有一个JSONFunction的对象，可以转换JavaScript的function。可以获取方法参数和方法体。同时，还可以用JSONObject、JSONArray构建Java对象，完成Java对象到JSON字符串的转换。

三、 JSON对象反序列化成Java对象

1、 将json字符串转成Java对象

private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"}," + "\"email\":\"[email protected]\",\"id\":22,\"name\":\"tom\"}"; /** * <b>function:</b>将json字符串转化为java对象 * @author hoojo * @createDate Nov 28, 2010 3:01:16 PM */@Test public void readJSON2Bean() { fail( "==============JSON Object String >>> Java Bean =================="); jsonObject = JSONObject.fromObject(json); Student stu = (Student) JSONObject.toBean(jsonObject, Student. class); fail(stu.toString());}

运行后，结果如下：

==============JSON Object String >>> Java Bean ==================tom#22#chian#2010-11-22#[email protected]

2、 将json字符串转换成动态Java对象(MorphDynaBean)

private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+ "\"email\":\"[email protected]\",\"id\":22,\"name\":\"tom\"}"; @Test public void readJSON2DynaBean() { try { fail( "==============JSON Object String >>> Java MorphDynaBean =================="); JSON jo = JSONSerializer.toJSON(json); Object o = JSONSerializer.toJava(jo); //MorphDynaBean fail(PropertyUtils.getProperty(o, "address").toString()); jsonObject = JSONObject.fromObject(json); fail(jsonObject.getString( "email")); o = JSONSerializer.toJava(jsonObject); //MorphDynaBean fail(PropertyUtils.getProperty(o, "name").toString()); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } catch (NoSuchMethodException e) { e.printStackTrace(); }}

转换后的对象Object是一个MorphDynaBean的动态JavaBean，通过PropertyUtils可以获得指定的属性的值。

运行后结果如下：

==============JSON Object String >>> Java MorphDynaBean [email protected]

3、 将json字符串转成Java的Array数组

private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+ "\"email\":\"[email protected]\",\"id\":22,\"name\":\"tom\"}"; @Test public void readJSON2Array() { try { fail( "==============JSON Arry String >>> Java Array =================="); json = "[" + json + "]"; jsonArray = JSONArray.fromObject(json); fail( "#%%%" + jsonArray.get(0).toString()); Object[] os = jsonArray.toArray(); System.out.println(os.length); fail(JSONArray.fromObject(json).join( "")); fail(os[0].toString()); Student[] stus = (Student[]) JSONArray.toArray(jsonArray, Student. class); System.out.println(stus.length); System.out.println(stus[0]); } catch (Exception e) { e.printStackTrace(); }}

运行的结果如下：

==============JSON Arry String >>> Java Array ==================#%%%{ "address": "chian", "birthday":{ "birthday": "2010-11-22"}, "email": "[email protected]", "id":22, "name": "tom"}1{ "address": "chian", "birthday":{ "birthday": "2010-11-22"}, "email": "[email protected]", "id":22, "name": "tom"}{ "address": "chian", "birthday":{ "birthday": "2010-11-22"}, "email": "[email protected]", "id":22, "name": "tom"}1tom#22#chian#2010-11-22#[email protected]

4、 将JSON字符串转成Java的List集合

private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+ "\"email\":\"[email protected]\",\"id\":22,\"name\":\"tom\"}"; @Test public void readJSON2List() { try { fail( "==============JSON Arry String >>> Java List =================="); json = "[" + json + "]"; jsonArray = JSONArray.fromObject(json); List<Student> list = JSONArray.toList(jsonArray, Student. class); System.out.println(list.size()); System.out.println(list.get(0)); list = JSONArray.toList(jsonArray); System.out.println(list.size()); System.out.println(list.get(0)); //MorphDynaBean } catch (Exception e) { e.printStackTrace(); }}

运行后结果如下：

==============JSON Arry String >>> Java List ==================1tom#22#chian#2010-11-22#[email protected]@141b571[ {id=22, birthday=net.sf.ezmorph.bean.MorphDynaBean@b23210[ {birthday=2010-11-22}], address=chian, [email protected], name=tom}]

5、 将json字符串转换成Collection接口

private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+ "\"email\":\"[email protected]\",\"id\":22,\"name\":\"tom\"}"; @Test public void readJSON2Collection() { try { fail( "==============JSON Arry String >>> Java Collection =================="); json = "[" + json + "]"; jsonArray = JSONArray.fromObject(json); Collection<Student> con = JSONArray.toCollection(jsonArray, Student. class); System.out.println(con.size()); Object[] stt = con.toArray(); System.out.println(stt.length); fail(stt[0].toString()); } catch (Exception e) { e.printStackTrace(); }}

刚才上面的将json转换成list提示该方法过时，这里有toCollection，可以用此方法代替toList方法；运行后结果如下：

==============JSON Arry String >>> Java Collection ==================11tom#22#chian#2010-11-22#[email protected]

6、 将json字符串转换成Map集合

@Test public void readJSON2Map() { try { fail( "==============JSON Arry String >>> Java Map =================="); json = "{\"arr\":[\"a\",\"b\"],\"A\":{\"address\":\"address\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+ "\"email\":\"email\",\"id\":1,\"name\":\"jack\"},\"int\":1,"+ "\"B\":{\"address\":\"address\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+ "\"email\":\"email\",\"id\":1,\"name\":\"jack\"},\"name\":\"json\",\"bool\":true}"; jsonObject = JSONObject.fromObject(json); Map<String, Class<?>> clazzMap = new HashMap<String, Class<?>>(); clazzMap.put( "arr", String[]. class); clazzMap.put( "A", Student. class); clazzMap.put( "B", Student. class); Map<String, ?> mapBean = (Map) JSONObject.toBean(jsonObject, Map. class, clazzMap); System.out.println(mapBean); Set<String> set = mapBean.keySet(); Iterator<String> iter = set.iterator(); while (iter.hasNext()) { String key = iter.next(); fail(key + ":" + mapBean.get(key).toString()); } } catch (Exception e) { e.printStackTrace(); }}

运行后结果如下：

==============JSON Arry String >>> Java Map =================={A=jack#1#address#2010-11-22#email, arr=[a, b], B=jack#1#address#2010-11-22#email, int=1, name=json, bool=true}A:jack#1#address#2010-11-22#emailarr:[a, b]B:jack#1#address#2010-11-22#email int:1name:jsonbool:true

四、 JSON-lib对XML的支持

1、 将Java对象到XML

/*============================Java Object >>>>> XML ==========================*/ /** * <b>function:</b> 转换Java对象到XML * 需要额外的jar包：xom.jar * @author hoojo * @createDate Nov 28, 2010 2:39:55 PM */@Test public void writeObject2XML() { XMLSerializer xmlSerializer = new XMLSerializer(); fail( "==============Java String Array >>> XML =================="); //xmlSerializer.setElementName("bean"); fail(xmlSerializer.write(JSONArray.fromObject(bean))); String[] sa = { "a", "b", "c"}; fail( "==============Java String Array >>> XML =================="); fail(xmlSerializer.write(JSONArray.fromObject(sa))); fail( "==============Java boolean Array >>> XML =================="); boolean[] bo = { true, false, true }; fail(xmlSerializer.write(JSONArray.fromObject(bo))); fail(xmlSerializer.write(JSONSerializer.toJSON(bo))); Object[] o = { 1, "a", true, 'A', sa, bo }; fail( "==============Java Object Array >>> JSON Array =================="); fail(xmlSerializer.write(JSONArray.fromObject(o))); fail(xmlSerializer.write(JSONSerializer.toJSON(o))); fail( "==============Java String >>> JSON =================="); fail(xmlSerializer.write(JSONArray.fromObject( "['json','is','easy']")).toString()); fail(xmlSerializer.write(JSONObject.fromObject( "{'json':'is easy'}")).toString()); fail(xmlSerializer.write(JSONSerializer.toJSON( "['json','is','easy']")).toString());}

主要运用的是XMLSerializer的write方法，这个方法可以完成java对象到xml的转换，不过你很容易就可以看到这个xml序列化对象，需要先将java对象转成json对象，然后再将json转换吃xml文档。

运行后结果如下：

==============Java String Array >>> XML ================== <? xml version ="1.0" encoding ="UTF-8"? > < a >< e class ="object" > < address type ="string" >address </ address >< birthday class ="object" >< birthday type ="string" >2010-11-22 </ birthday ></ birthday > < email type ="string" >email </ email >< id type ="number" >1 </ id >< name type ="string" >haha </ name > </ e ></ a > ==============Java String Array >>> XML ================== <? xml version ="1.0" encoding ="UTF-8"? > < a >< e type ="string" >a </ e >< e type ="string" >b </ e >< e type ="string" >c </ e ></ a > ==============Java boolean Array >>> XML ================== <? xml version ="1.0" encoding ="UTF-8"? > < a >< e type ="boolean" >true </ e >< e type ="boolean" >false </ e >< e type ="boolean" >true </ e ></ a >  <? xml version ="1.0" encoding ="UTF-8"? > < a >< e type ="boolean" >true </ e >< e type ="boolean" >false </ e >< e type ="boolean" >true </ e ></ a > ==============Java Object Array >>> JSON Array ================== <? xml version ="1.0" encoding ="UTF-8"? > < a >< e type ="number" >1 </ e >< e type ="string" >a </ e >< e type ="boolean" >true </ e >< e type ="string" >A </ e >< e class ="array" > < e type ="string" >a </ e >< e type ="string" >b </ e >< e type ="string" >c </ e ></ e >< e class ="array" >< e type ="boolean" >true </ e > < e type ="boolean" >false </ e >< e type ="boolean" >true </ e ></ e ></ a >  <? xml version ="1.0" encoding ="UTF-8"? > < a >< e type ="number" >1 </ e >< e type ="string" >a </ e >< e type ="boolean" >true </ e >< e type ="string" >A </ e >< e class ="array" > < e type ="string" >a </ e >< e type ="string" >b </ e >< e type ="string" >c </ e ></ e >< e class ="array" >< e type ="boolean" >true </ e > < e type ="boolean" >false </ e >< e type ="boolean" >true </ e ></ e ></ a > ==============Java String >>> JSON ================== <? xml version ="1.0" encoding ="UTF-8"? > < a >< e type ="string" >json </ e >< e type ="string" >is </ e >< e type ="string" >easy </ e ></ a >  <? xml version ="1.0" encoding ="UTF-8"? > < o >< json type ="string" >is easy </ json ></ o >  <? xml version ="1.0" encoding ="UTF-8"? > < a >< e type ="string" >json </ e >< e type ="string" >is </ e >< e type ="string" >easy </ e ></ a >

上面的节点名称有点乱，你可以通过setElementName设置节点名称

2、 将XML转换成Java对象

/*============================XML String >>>>> Java Object ==========================*/ /** * <b>function:</b>转换xml文档到java对象 * @author hoojo * @createDate Nov 28, 2010 3:00:27 PM */@Test public void readXML2Object() { XMLSerializer xmlSerializer = new XMLSerializer(); fail( "============== XML >>>> Java String Array =================="); String[] sa = { "a", "b", "c"}; jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject(sa))); fail(jsonArray.toString()); String[] s = (String[]) JSONArray.toArray(jsonArray, String. class); fail(s[0].toString()); fail( "============== XML >>>> Java boolean Array =================="); boolean[] bo = { true, false, true }; jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject(bo))); bo = ( boolean[]) JSONArray.toArray(jsonArray, boolean. class); fail(bo.toString()); System.out.println(bo[0]); jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONSerializer.toJSON(bo))); bo = ( boolean[]) JSONArray.toArray(jsonArray, boolean. class); fail(bo.toString()); System.out.println(bo[0]); fail( "==============Java Object Array >>> JSON Array =================="); Object[] o = { 1, "a", true, 'A', sa, bo }; jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject(o))); System.out.println(jsonArray.getInt(0)); System.out.println(jsonArray.get(1)); System.out.println(jsonArray.getBoolean(2)); jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONSerializer.toJSON(o))); System.out.println(jsonArray.get(4)); System.out.println(jsonArray.getJSONArray(5).get(0)); System.out.println(jsonArray.get(5)); fail( "==============Java String >>> JSON =================="); jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONArray.fromObject( "['json','is','easy']")).toString()); s = (String[]) JSONArray.toArray(jsonArray, String. class); fail(s[0].toString()); jsonObject = (JSONObject) xmlSerializer.read(xmlSerializer.write(JSONObject.fromObject( "{'json':'is easy'}")).toString()); Object obj = JSONObject.toBean(jsonObject); System.out.println(obj); jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONSerializer.toJSON( "['json','is','easy']")).toString()); s = (String[]) JSONArray.toArray(jsonArray, String. class); fail(s[1].toString());}

主要运用到XMLSerializer的read方法，将xml内容读取后，转换成Java对象。运行后结果如下：

============== XML >>>> Java String Array ==================[ "a", "b", "c"]a============== XML >>>> Java boolean Array ==================[Z@15856a5true[Z@79ed7ftrue==============Java Object Array >>> JSON Array ==================1atrue[ "a", "b", "c"]true[ "true", "false", "true"]==============Java String >>> JSON ==================jsonnet.sf.ezmorph.bean.MorphDynaBean@c09554[ {json=is easy}]is

3、 将xml的字符串内容，转换成Java的Array对象

@Test public void testReadXml2Array() { String str = "<a class=\"array\">" + "<e type=\"function\" params=\"i,j\">" + "return matrix[i][j];" + "</e>" + "</a>"; JSONArray json = (JSONArray) new XMLSerializer().read(str); fail(json.toString()); }

上面是一段xml字符串格式的文档，将其转换为JSONArray对象。转换后结果如下：

[function(i,j){ return matrix[i][j]; }]

就是一个数组；