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Json-lib可以將Java對象轉成json格式的字符串,也可以將Java對象轉換成xml格式的文檔,同樣可以將json字符串轉換成Java對象或是將xml字符串轉換成Java對象。

一、 準備工作 

 

1、 首先要去官方下載json-lib工具包

下載地址:

//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還需要以下依賴包:

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

官方網址://json-lib.sourceforge.net/

然后在工程中添加如下jar包:

clip_image002

當然你也可以用2.4的json-lib庫

你可以在這里看看官方提供的示例:

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

由于本次介紹的示例需要junit工具,所以你還需要添加junit的jar文件,版本是4.8.2版本的,下載地址:https://github.com/KentBeck/junit/downloads

如果你還不了解JSON是什么?那么你應該可以看看//www.json.org/json-zh.html

2、 要轉換的JavaBean的代碼如下:

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,自己構建下。

3、 新建JsonlibTest測試類,基本代碼如下:

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轉換java對象到JSON字符串
 * 讀取json字符串到java對象,序列化jsonObject到xml
 * json-lib-version: json-lib-2.3-jdk15.jar
 * 依賴包: 
 * 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 //blog.csdn.net/IBM_hoojo
 * @email hoojo_@126.com
 * @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會在每個方法之前運行,destory會在每個方法完成后執行。分別用到了junit的@Before、@After注解,如果你對junit的這些注解不是很了解,可以看看junit官方的測試用例的example和doc;

JSONObject是將Java對象轉換成一個json的Object形式,JSONArray是將一個Java對象轉換成json的Array格式。

那什么是json的Object形式、Array形式?

用通俗易懂的方法將,所謂的json的Object形式就是一個花括號里面存放的如JavaMap的鍵值對,如:{name:’hoojo’, age: 24};

那么json的Array形式呢?

就是中括號,括起來的數組。如:[ ‘json’, true, 22];

如果你還想了解更多json方面的知識,請看://www.json.org/json-zh.html

除了上面的JSONArray、JSONObject可以將Java對象轉換成JSON或是相反,將JSON字符串轉換成Java對象,還有一個對象也可以完成上面的功能,它就是JSONSerializer;下面我們就來看看它們是怎么玩轉Java對象和JSON的。

二、 Java對象序列化成JSON對象

1、 將JavaObject轉換吃JSON字符串

在JsonlibTest中添加如下代碼:

/*=========================Java Object >>>> JSON String ===========================*/
/**
 * <b>function:</b>轉Java Bean對象到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會在最外層套上[]
    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 + "##修改過的日期";
        }
 
    });
    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屬性
            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將Java對象轉換成json字符串,toBean將json對象轉換成Java對象;

上面方法值得注意的是使用了JsonConfig這個對象,這個對象可以在序列化的時候對JavaObject的數據進行處理、過濾等

上面的jsonConfig的registerJsonValueProcessor方法可以完成對象值的處理和修改,比如處理生日為null時,給一個特定的值。同樣setJsonPropertyFilter和setJavaPropertyFilter都是完成對轉換后的值的處理。

運行上面的代碼可以在控制臺看到如下結果:

==============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##修改過的日期","email":"email","id":1,"name":"haha"}
2010-11-22##修改過的日期
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##修改過的日期#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、 將JavaList集合轉換吃JSON字符串

/**
 * <b>function:</b>轉換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());
}

運行此方法后,可以看到控制臺輸出:

==============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"}]

如果你是轉換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方法轉換List會出現異常,通常使用JSONSrializer這個JSON序列化的方法,它會自動識別你傳遞的對象的類型,然后轉換成相應的JSON字符串。

3、 將Map集合轉換成JSON對象

/**
 * <b>function:</b>轉Java Map對象到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函數的字符串。

運行上面的程序,結果如下:

==============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、 將更多類型轉換成JSON

/**
 * <b>function:</b>  轉換更多數組類型到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() );   
}

運行后結果如下:

==============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);

這里還有一個JSONFunction的對象,可以轉換JavaScript的function??梢曰袢》椒ú問頭椒ㄌ?。同時,還可以用JSONObject、JSONArray構建Java對象,完成Java對象到JSON字符串的轉換。

三、 JSON對象反序列化成Java對象

1、 將json字符串轉成Java對象

private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"}," +
        "\"email\":\"email@123.com\",\"id\":22,\"name\":\"tom\"}";
/**
 * <b>function:</b>將json字符串轉化為java對象
 * @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());
}

運行后,結果如下:

==============JSON Object String >>> Java Bean ==================
tom#22#chian#2010-11-22#email@123.com

2、 將json字符串轉換成動態Java對象(MorphDynaBean)

private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+
        "\"email\":\"email@123.com\",\"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();
    }
}

轉換后的對象Object是一個MorphDynaBean的動態JavaBean,通過PropertyUtils可以獲得指定的屬性的值。

運行后結果如下:

==============JSON Object String >>> Java MorphDynaBean =============
chian
email@123.com
tom

3、 將json字符串轉成Java的Array數組

private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+
        "\"email\":\"email@123.com\",\"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();
    }
}

運行的結果如下:

==============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、 將JSON字符串轉成Java的List集合

private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+
        "\"email\":\"email@123.com\",\"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();
    }
}

運行后結果如下:

==============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、 將json字符串轉換成Collection接口

private String json = "{\"address\":\"chian\",\"birthday\":{\"birthday\":\"2010-11-22\"},"+
        "\"email\":\"email@123.com\",\"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();
    }
}

剛才上面的將json轉換成list提示該方法過時,這里有toCollection,可以用此方法代替toList方法;運行后結果如下:

==============JSON Arry String >>> Java Collection ==================
1
1
tom#22#chian#2010-11-22#email@123.com

6、 將json字符串轉換成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();
    }
}

運行后結果如下:

==============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-libXML的支持

1、 將Java對象到XML

/*============================Java Object >>>>> XML ==========================*/
/**
 * <b>function:</b> 轉換Java對象到XML
 * 需要額外的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());
}

主要運用的是XMLSerializer的write方法,這個方法可以完成java對象到xml的轉換,不過你很容易就可以看到這個xml序列化對象,需要先將java對象轉成json對象,然后再將json轉換吃xml文檔。

運行后結果如下:

==============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>

上面的節點名稱有點亂,你可以通過setElementName設置節點名稱

2、 將XML轉換成Java對象

/*============================XML String >>>>> Java Object ==========================*/
/**
 * <b>function:</b>轉換xml文檔到java對象
 * @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());
}

主要運用到XMLSerializer的read方法,將xml內容讀取后,轉換成Java對象。運行后結果如下:

============== 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、 將xml的字符串內容,轉換成Java的Array對象

@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字符串格式的文檔,將其轉換為JSONArray對象。轉換后結果如下:

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

就是一個數組;

posted on 2012-02-23 10:56 紫蝶∏飛揚↗ 閱讀(1449) 評論(0)  編輯  收藏 所屬分類: Json
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