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

一、 准备工作 

 

1、 首先要去官方下载json-lib工具包

下载地址：

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

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

jakarta commons-lang 2.5

jakarta commons-beanutils 1.8.0

jakarta commons-collections 3.2.1

jakarta commons-logging 1.1.1

ezmorph 1.0.6

官方网址：http://json-lib.sourceforge.net/

然后在工程中添加如下jar包：

当然你也可以用2.4的json-lib库

你可以在这里看看官方提供的示例：

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

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

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

2、 要转换的JavaBean的代码如下：

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

Birthday.java

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

注意，上面的getter、setter方法省略了，自己构建下。

3、 新建JsonlibTest测试类，基本代码如下：

package com.hoo.test;
 
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import net.sf.json.JSON;
import net.sf.json.JSONArray;
import net.sf.json.JSONFunction;
import net.sf.json.JSONObject;
import net.sf.json.JSONSerializer;
import net.sf.json.JsonConfig;
import net.sf.json.processors.JsonValueProcessor;
import net.sf.json.util.PropertyFilter;
import net.sf.json.xml.XMLSerializer;
import org.apache.commons.beanutils.PropertyUtils;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.hoo.entity.Birthday;
import com.hoo.entity.Student;
 
/**
 * <b>function:</b> 用json-lib转换java对象到JSON字符串
 * 读取json字符串到java对象，序列化jsonObject到xml
 * json-lib-version: json-lib-2.3-jdk15.jar
 * 依赖包: 
 * commons-beanutils.jar
 * commons-collections-3.2.jar
 * ezmorph-1.0.3.jar
 * commons-lang.jar
 * commons-logging.jar
 * @author hoojo
 * @createDate Nov 28, 2010 2:28:39 PM
 * @file JsonlibTest.java
 * @package com.hoo.test
 * @project WebHttpUtils
 * @blog http://blog.csdn.net/IBM_hoojo
 * @email 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\":\"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\"}";
 
@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\"}";
 
@Test
public void readJSON2Array() {
    try {
        fail("==============JSON Arry String >>> Java Array ==================");
        json = "[" + json + "]";
        jsonArray = JSONArray.fromObject(json);
        fail("#%%%" + jsonArray.get(0).toString());
        Object[] os = jsonArray.toArray();
        System.out.println(os.length);
        
        fail(JSONArray.fromObject(json).join(""));
        fail(os[0].toString());
        Student[] stus = (Student[]) JSONArray.toArray(jsonArray, Student.class);
        System.out.println(stus.length);
        System.out.println(stus[0]);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

运行的结果如下：

==============JSON Arry String >>> Java Array ==================
#%%%{"address":"chian","birthday":{"birthday":"2010-11-22"},"email":"email@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\"}";
 
@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#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\"}";
 
@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#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);
        
        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；


版权所有，转载请注明出处 本文出自： 
版权所有，欢迎转载，转载请注明出处，谢谢

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分类: JavaEE, JavaSE, Others, JSON&XML
标签: JavaEE, JavaSE, JSON, JSON-lib, XML转换, JSON转换
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« 上一篇：FreeMarker整合Spring 3
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posted on 2011-04-21 17:24 hoojo 阅读(111551) 评论(15) 编辑 收藏


评论:

#1楼 2011-04-22 10:13 | LanceZhang

呵呵，.net做这点活不在话下
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#2楼[楼主] 2011-04-22 10:31 | hoojo

@LanceZhang
\(^o^)/~ JSON官方也提供了.net这方面的第三方转换工具吧。
如：JSON for ASP、JSON ASP utility class、JSON for .NET、fastJSON等
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#3楼 2011-05-04 11:12 | nightmare23

mark.....
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#4楼 2011-09-20 11:14 | 093

不错
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#5楼 2012-05-26 09:48 | superhzh

good,支持一下
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#6楼 2012-09-25 16:40 | mazongfei

jar的问题很严重啊
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#7楼[楼主] 2012-09-25 20:59 | hoojo

@mazongfei
你按照版本下载即可，如果是新版本的jar肯定有所不同的
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#8楼 2013-03-05 22:55 | 矢风快乐

你太强大了！向你努力，希望多多指教。如果愿意，想和你一起学习。我的Ｑ：１００３４７４６５６，请加下吧。
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#9楼 2013-05-28 11:32 | thehappyyouth

膜拜
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#10楼 2013-07-05 13:54 | love_paradise

我想请问下，用这个xmlSerializer.write 转换json成xml 怎么自定义
其中的节点呢，
我写的一个简单例子 他转换成是这样的：
<?xml version="1.0" encoding="UTF-8"?>
<a>
<e class="object">
<Packet class="array">
<e class="object">
<head class="array">
<e class="object">
<REQUESTTYPE type="string">Q02</REQUESTTYPE>
<UUID type="string">123456</UUID>
</e>
</head>
</e>
</Packet>
</e>
</a>
我想要的是这样的：
<?xml version="1.0" encoding="GBK"?>
<Packet type="REQUEST" version="1.0">
<Head>
<UUID>12346</UUID>
<REQUESTERCODE>mp</REQUESTERCODE>
</Head>
<Body>
<CarQuoteInfoQueReq>
<RECORDSPERPAGE>15</RECORDSPERPAGE>
</CarQuoteInfoQueReq>
</Body>
</Packet>

首先 是<a> 节点 还有<e> 这个 循环出现了 3次，我该怎么写代码
才能出现我想要的结果呢，在线等大神回复。

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#11楼[楼主] 2013-07-08 16:56 | hoojo

@love_paradise
也许需要使用定制的Config，你看看在wirte的时候能不能传入config，这个config可能是关键。 如果不行，建议你使用xstream 这个比较简单好用。我博文中也有这个框架的使用。
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#12楼 2013-09-09 14:08 | micro_lmj

太强悍了 学习！！！！
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#13楼 2013-10-13 22:25 | VinpleZhang

请问 String json="<?xml version=\"1.0\" encoding=\"GBK\"?><policyList>\n <policy>\n <policyNo>100001594487</policyNo>\n <holderName>沈晨</holderName>\n <payLimit>6</payLimit>\n <premium>10.5</premium>\n <productName>信泰轮船意外伤害保险</productName>\n <startDate>2013-07-12</startDate>\n <endDate>2014-01-12</endDate>\n <status>active</status>\n <type>1361</type>\n <attributes>\n <dueDate />\n <renewTermUrl/> \n <renewTermLimit />\n <renewUrl />\n <renewLimit />\n <queryUrl />\n <modifyTime />\n <assetsPresentValue />\n <accountList>\n <accountName />\n <unitNetValue />\n <quotient />\n <accountValue />\n </accountList>\n </attributes>\n </policy>\n</policyList>";
String mNostdJsonStr = String.valueOf(getJSONFromXml(json));
System.out.println(mNostdJsonStr);

为什么输出的有些字段 的value变成[ ]了？？？？
[{"startDate":"2013-07-12","status":"active","premium":"10.5","endDate":"2014-01-12","policyNo":"100001594487","attributes":{"queryUrl":[],"accountList":{"quotient":[],"accountName":[],"accountValue":[],"unitNetValue":[]},"renewTermLimit":[],"renewTermUrl":[],"renewUrl":[],"renewLimit":[],"assetsPresentValue":[],"dueDate":[],"modifyTime":[]},"type":"1361","payLimit":"6","productName":"信泰轮船意外伤害保险","holderName":"沈晨"}]

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#14楼 2014-08-28 10:28 | 栖息之鹰

话说java做个简单的json转换怎么就这么麻烦呢？
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#15楼 2015-04-22 11:44 | Rising_Sun

Newtonsoft.Json
干这活不在话下
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http://www.cnblogs.com/hoojo/archive/2011/04/21/2023805.html

转载于:https://www.cnblogs.com/pengmn/p/5250576.html

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