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：

　　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 [e-mail]* @version 1.0*/@SuppressWarnings({ "deprecation", "unchecked" })public class JsonlibTest {private JSONArray jsonArray = null;private JSONObject jsonObject = null; private Student bean = null;@Beforepublic 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);}@Afterpublic 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--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);

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 ==================
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\":\"[e-mail]\",\"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#[e-mail]

　　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\":\"[e-mail]\",\"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 =============
chian
[e-mail]
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\":\"[e-mail]\",\"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":"[e-mail]","id":22,"name":"tom"}
1
{"address":"chian","birthday":{"birthday":"2010-11-22"},"email":"[e-mail]","id":22,"name":"tom"}
{"address":"chian","birthday":{"birthday":"2010-11-22"},"email":"[e-mail]","id":22,"name":"tom"}
1
tom#22#chian#2010-11-22#[e-mail]

　　4、 将JSON字符串转成Java的List集合

private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+
"\"email\":\"[e-mail]\",\"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 ==================
1
tom#22#chian#2010-11-22#[e-mail]
1
net.sf.ezmorph.bean.MorphDynaBean@141b571[
{id=22, birthday=net.sf.ezmorph.bean.MorphDynaBean@b23210[
{birthday=2010-11-22}
], address=chian, email=[e-mail], 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\":\"[e-mail]\",\"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 ==================
1
1
tom#22#chian#2010-11-22#[e-mail]

 

　　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#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());

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@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。

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原文链接：http://tech.it168.com/a2011/0628/1210/000001210209_all.shtml

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