Mit dem JSON-lib-Framework ist die Konvertierung von JSON und XML nicht mehr schwierig

Json-lib kann Java-Objekte in JSON-Format-Strings konvertieren und kann auch Java-Objekte in XML-Format-Dokumente konvertieren. Es kann auch JSON-Strings in Java-Objekte oder XML-Strings in Java-Objekte konvertieren.

1. Vorbereitung

1 Gehen Sie zum offiziellen Download des json-lib-Toolpakets

Download-Adresse:

http://www.php.cn/

Die neueste Version ist in diesem Beispiel 2.4. v2.3 wird verwendet; json-lib erfordert außerdem die folgenden Abhängigkeitspakete:

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

Offizielle Website: http://www.php.cn/

Dann fügen Sie dem Projekt das folgende JAR-Paket hinzu:

Natürlich können Sie auch die 2.4 json-lib-Bibliothek verwenden

Sie können sich die offizielle Version ansehen Angebot hier Beispiel:

http://www.php.cn/

Da das dieses Mal vorgestellte Beispiel das Junit-Tool erfordert, müssen Sie auch die Junit-JAR-Datei hinzufügen, die Version ist 4.8.2 Version, Download-Adresse: http://www.php.cn/

Wenn Sie immer noch nicht wissen, was JSON ist? Dann sollten Sie einen Blick auf http://www.php.cn/

2 werfen. Der Code des zu konvertierenden JavaBean lautet wie folgt:

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>

Geburtstag .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;

    }

}

Beachten Sie, dass die oben genannten Getter- und Setter-Methoden weggelassen werden. Erstellen Sie sie selbst .

3. Erstellen Sie eine neue JsonlibTest-Testklasse:

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.php.cn/

 * @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.php.cn/

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>();</student></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> map = new HashMap<string>();</string></string>

    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；

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