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://www.sxiaw.com/
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://www.sxiaw.com/
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://www.sxiaw.com/
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：http://www.sxiaw.com/
如果你还不了解JSON是什么？那么你应该可以看看http://www.sxiaw.com/
2、 要转换的JavaBean的代码如下：
package com.hoo.entity;
<br>
public class Student {private int id;
private String name;
private String email;
private String address;
private Birthday birthday;
<br>
//setter、getter
public String toString() {return this.name + "#" + this.id + "#" + this.address + "#" + this.birthday + "#" + this.email;
}
}
<br>
Birthday.java
package com.hoo.entity;
<br>
public class Birthday {private String birthday;
<br>
public Birthday(String birthday) {super();
this.birthday = birthday;
}
//setter、getter
public Birthday() {}<br>
@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;
<br>
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;
<br>
/**
* <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://www.sxiaw.com/
* @email hoojo_@126.com
* @version 1.0
*/
@SuppressWarnings({ "deprecation", "unchecked" })public class JsonlibTest {private JSONArray jsonArray = null;
private JSONObject jsonObject = null;
<br>
private Student bean = null;
<br>
@Before
public void init() {jsonArray = new JSONArray();
jsonObject = new JSONObject();
<br>
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);
}
<br>
@After
public void destory() {jsonArray = null;
jsonObject = null;
bean = null;
System.gc();
}
<br>
public final void fail(String string) {System.out.println(string);
}
<br>
public final void failRed(String string) {System.err.println(string);
}
<br>
}
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.sxiaw.com/
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());
<br>
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;
}
<br>
public Object processObjectValue(String key, Object value, JsonConfig jsonConfig) { fail("key:" + key);return value + "##修改过的日期";
}
<br>
});
jsonObject = JSONObject.fromObject(bean, jsonConfig);
<br>
fail(jsonObject.toString());
Student student = (Student) JSONObject.toBean(jsonObject, Student.class);
fail(jsonObject.getString("birthday"));fail(student.toString());
<br>
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--address
haha#1#address#2010-11-22#email%%%birthday--2010-11-22
haha#1#address#2010-11-22#email%%%email--email
haha#1#address#2010-11-22#email%%%id--1
haha#1#address#2010-11-22#email%%%name--haha
{"address":"address","email":"email","id":1,"name":"haha"}#################JavaPropertyFilter##################
address@address#null#0#null#null#null
birthday@2010-11-22##修改过的日期#null#0#address#null#null
email@email#null#0#address#null#null
id@1#null#0#address#null#null
name@haha#null#0#address#null#null
Student: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);<br>
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());
<br>
fail("==============Java JSONArray >>> JSON ==================");jsonArray = new JSONArray()
.element( "JSON" )
.element( "1" )
.element( "2.0" )
.element( "true" );
fail(JSONSerializer.toJSON(jsonArray).toString());
<br>
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]);
<br>
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 ==================
param
doSomethingWithParam(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@123.com\",\"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@123.com
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@123.com\",\"id\":22,\"name\":\"tom\"}";
<br>
@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 =============
chian
email@123.com
tom
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@123.com\",\"id\":22,\"name\":\"tom\"}";
<br>
@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);
<br>
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@123.com","id":22,"name":"tom"}1
{"address":"chian","birthday":{"birthday":"2010-11-22"},"email":"email@123.com","id":22,"name":"tom"}{"address":"chian","birthday":{"birthday":"2010-11-22"},"email":"email@123.com","id":22,"name":"tom"}1
tom#22#chian#2010-11-22#email@123.com
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@123.com\",\"id\":22,\"name\":\"tom\"}";
<br>
@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));
<br>
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 ==================
1
tom#22#chian#2010-11-22#email@123.com
1
net.sf.ezmorph.bean.MorphDynaBean@141b571[
{id=22, birthday=net.sf.ezmorph.bean.MorphDynaBean@b23210[ {birthday=2010-11-22}], address=chian, email=email@123.com, 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@123.com\",\"id\":22,\"name\":\"tom\"}";
<br>
@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());
<br>
} 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 ==================
1
1
tom#22#chian#2010-11-22#email@123.com
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);
<br>
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#email
arr:[a, b]
B:jack#1#address#2010-11-22#email
int:1
name:json
bool: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());
<br>
String[] s = (String[]) JSONArray.toArray(jsonArray, String.class);
fail(s[0].toString());
<br>
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]);
<br>
jsonArray = (JSONArray) xmlSerializer.read(xmlSerializer.write(JSONSerializer.toJSON(bo)));
bo = (boolean[]) JSONArray.toArray(jsonArray, boolean.class);
fail(bo.toString());
System.out.println(bo[0]);
<br>
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));
<br>
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@15856a5
true
[Z@79ed7f
true
==============Java Object Array >>> JSON Array ==================
1
a
true
["a","b","c"]
true
["true","false","true"]
==============Java String >>> JSON ==================
json
net.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；
以上就是JSON-lib框架，转换JSON、XML不再困难的内容，更多相关内容请关注硕下网（www.sxiaw.com）！