JSON-lib使用手册

梦里梦外; 2022-08-21 15:55 8阅读 0赞

## 1、JsonLib简介 ##

Json-lib包是一个[Java][]类库，提供将Java对象（包括：beans，maps，collections，java arrays 和 XML等）和JSON互相转换的功能。

相关的Jar包：

*  json-lib-2.3-jdk15.jar
 *  commons-beanutils-1.8.0.jar
 *  commons-collections-3.1.jar
 *  commons-lang-2.4.jar
 *  commons-logging-1.1.1.jar
 *  ezmorph-1.0.6.jar

备注：我们这里用的Struts-2.3.3版本中Json-lib包。

官方网站：[http://json-lib.sourceforge.net/][http_json-lib.sourceforge.net]

下表中是Java与[JavaScript][]类型对应关系。

<table style="margin:0px auto; border-collapse:collapse; width:684px; border:1px solid rgb(192,192,192); padding:0px"> 
 <tbody style="padding:0px; margin:0px"> 
 <tr style="height:21px; padding:0px; margin:0px; background-color:rgb(224,224,224)"> 
 <td style="padding:3px 7px; border-collapse:collapse; border:1.5pt solid; margin:0px"> JSON </td> 
 <td style="padding:3px 7px; border-width:1.5pt 1.5pt 1.5pt 1px; border-style:solid solid solid none; border-left-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> &nbsp;</td> 
 <td style="padding:3px 7px; border-width:1.5pt 1.5pt 1.5pt 1px; border-style:solid solid solid none; border-left-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> Java </td> 
 </tr> 
 <tr style="height:21px; padding:0px; margin:0px"> 
 <td style="padding:3px 7px; border-width:1px 0.75pt 0.75pt 1.5pt; border-style:none solid solid; border-top-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> string </td> 
 <td style="padding:3px 7px; border-width:1px 0.75pt 0.75pt 1px; border-style:none solid solid none; border-top-color:rgb(192,192,192); border-left-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> &lt;=&gt; </td> 
 <td style="padding:3px 7px; border-width:1px 1.5pt 0.75pt 1px; border-style:none solid solid none; border-top-color:rgb(192,192,192); border-left-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> java.lang.String, java.lang.Character, char </td> 
 </tr> 
 <tr style="height:21px; padding:0px; margin:0px"> 
 <td style="padding:3px 7px; border-width:1px 0.75pt 0.75pt 1.5pt; border-style:none solid solid; border-top-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> number </td> 
 <td style="padding:3px 7px; border-width:1px 0.75pt 0.75pt 1px; border-style:none solid solid none; border-top-color:rgb(192,192,192); border-left-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> &lt;=&gt; </td> 
 <td style="padding:3px 7px; border-width:1px 1.5pt 0.75pt 1px; border-style:none solid solid none; border-top-color:rgb(192,192,192); border-left-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> java.lang.Number, byte, short, int, long, float, double </td> 
 </tr> 
 <tr style="height:21px; padding:0px; margin:0px"> 
 <td style="padding:3px 7px; border-width:1px 0.75pt 0.75pt 1.5pt; border-style:none solid solid; border-top-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> true|false&nbsp; </td> 
 <td style="padding:3px 7px; border-width:1px 0.75pt 0.75pt 1px; border-style:none solid solid none; border-top-color:rgb(192,192,192); border-left-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> &lt;=&gt;&nbsp; </td> 
 <td style="padding:3px 7px; border-width:1px 1.5pt 0.75pt 1px; border-style:none solid solid none; border-top-color:rgb(192,192,192); border-left-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> java.lang.Boolean, boolean&nbsp; </td> 
 </tr> 
 <tr style="height:21px; padding:0px; margin:0px"> 
 <td style="padding:3px 7px; border-width:1px 0.75pt 0.75pt 1.5pt; border-style:none solid solid; border-top-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> null </td> 
 <td style="padding:3px 7px; border-width:1px 0.75pt 0.75pt 1px; border-style:none solid solid none; border-top-color:rgb(192,192,192); border-left-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> &lt;=&gt; </td> 
 <td style="padding:3px 7px; border-width:1px 1.5pt 0.75pt 1px; border-style:none solid solid none; border-top-color:rgb(192,192,192); border-left-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> null </td> 
 </tr> 
 <tr style="height:21px; padding:0px; margin:0px"> 
 <td style="padding:3px 7px; border-width:1px 0.75pt 0.75pt 1.5pt; border-style:none solid solid; border-top-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> function&nbsp; </td> 
 <td style="padding:3px 7px; border-width:1px 0.75pt 0.75pt 1px; border-style:none solid solid none; border-top-color:rgb(192,192,192); border-left-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> &lt;=&gt; </td> 
 <td style="padding:3px 7px; border-width:1px 1.5pt 0.75pt 1px; border-style:none solid solid none; border-top-color:rgb(192,192,192); border-left-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> net.sf.json.JSONFunction&nbsp; </td> 
 </tr> 
 <tr style="height:21px; padding:0px; margin:0px"> 
 <td style="padding:3px 7px; border-width:1px 0.75pt 0.75pt 1.5pt; border-style:none solid solid; border-top-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> array&nbsp; </td> 
 <td style="padding:3px 7px; border-width:1px 0.75pt 0.75pt 1px; border-style:none solid solid none; border-top-color:rgb(192,192,192); border-left-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> &lt;=&gt; </td> 
 <td style="padding:3px 7px; border-width:1px 1.5pt 0.75pt 1px; border-style:none solid solid none; border-top-color:rgb(192,192,192); border-left-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> net.sf.json.JSONArray (object, string, number, boolean, function)&nbsp; </td> 
 </tr> 
 <tr style="height:21px; padding:0px; margin:0px"> 
 <td style="padding:3px 7px; border-width:1px 0.75pt 1.5pt 1.5pt; border-style:none solid solid; border-top-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> object&nbsp; </td> 
 <td style="padding:3px 7px; border-width:1px 0.75pt 1.5pt 1px; border-style:none solid solid none; border-top-color:rgb(192,192,192); border-left-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> &lt;=&gt; </td> 
 <td style="padding:3px 7px; border-width:1px 1.5pt 1.5pt 1px; border-style:none solid solid none; border-top-color:rgb(192,192,192); border-left-color:rgb(192,192,192); border-collapse:collapse; margin:0px"> net.sf.json.JSONObject&nbsp; </td> 
 </tr> 
 </tbody> 
</table>

## 2、JsonLib使用 ##

### 2.1 准备工作 ###

我们这里使用JUnit4.0进行测试实验，下面是测试中使用中的类。

【测试实体——Student】

> package com.hebut.jsonlib;
> 
>  
> 
> public class Student \{ 
> 
>     private String userName;
> 
>     private String sex;
> 
>     private int age;
> 
>    
> 
>     public Student() \{ 
> 
>     \}
> 
>    
> 
>     public Student(String userName, String sex, int age) \{ 
> 
>         this.userName = userName;
> 
>         this.sex = sex;
> 
>         this.age = age;
> 
>     \}
> 
>  
> 
>     public String getUserName() \{ 
> 
>         return userName;
> 
>     \}
> 
>     public void setUserName(String userName) \{ 
> 
>         this.userName = userName;
> 
>     \}
> 
>     public String getSex() \{ 
> 
>         return sex;
> 
>     \}
> 
>    
> 
>     public void setSex(String sex) \{ 
> 
>         this.sex = sex;
> 
>     \}
> 
>     public int getAge() \{ 
> 
>         return age;
> 
>     \}
> 
>     public void setAge(int age) \{ 
> 
>         this.age = age;
> 
>     \}
> 
> \}

【测试实体——Class】

> package com.hebut.jsonlib;
> 
>  
> 
> import java.util.Date;
> 
> import java.util.List;
> 
>  
> 
> public class Class \{ 
> 
>     private String name;
> 
>     private Date date;
> 
>     private List<Student> students;
> 
>    
> 
>     public Class() \{ 
> 
>     \}
> 
>    
> 
>     public Class(String name, Date date, List<Student> students) \{ 
> 
>         this.name = name;
> 
>         this.date = date;
> 
>         this.students = students;
> 
>     \}
> 
>    
> 
>     public String getName() \{ 
> 
>         return name;
> 
>     \}
> 
>     public void setName(String name) \{ 
> 
>         this.name = name;
> 
>     \}
> 
>     public Date getDate() \{ 
> 
>         return date;
> 
>     \}
> 
>     public void setDate(Date date) \{ 
> 
>         this.date = date;
> 
>     \}
> 
>     public List<Student> getStudents() \{ 
> 
>         return students;
> 
>     \}
> 
>     public void setStudents(List<Student> students) \{ 
> 
>         this.students = students;
> 
>     \}
> 
> \}

### 2.2 处理ArraysToJson ###

【示例代码】

> package com.hebut.jsonlib;
> 
>  
> 
> import java.util.ArrayList;
> 
> import java.util.List;
> 
> import net.sf.json.JSONArray;
> 
> import org.junit.Test;
> 
>  
> 
> public class JsonLib \{ 
> 
>  
> 
>     @Test
> 
>     public void array2json() \{ 
> 
>         int\[\] intArray = new int\[\]\{1,4,5\};
> 
>         JSONArray jsonArray1 = JSONArray.fromObject(intArray);
> 
>         System.out.println("int\[\] intArray");
> 
>         System.out.println(jsonArray1);
> 
>        
> 
>         boolean\[\] boolArray = new boolean\[\]\{ true,false,true\};
> 
>         System.out.println("boolean\[\] boolArray");
> 
>         JSONArray jsonArray2 = JSONArray.fromObject(boolArray);
> 
>         System.out.println(jsonArray2);
> 
>        
> 
>         int\[\]\[\] int2Array = new int\[\]\[\]\{ \{1,2\},\{3,4\}\};
> 
>         JSONArray jsonArray3 = JSONArray.fromObject(int2Array);
> 
>         System.out.println("int\[\]\[\] int2Array");
> 
>         System.out.println(jsonArray3);
> 
>        
> 
>         float\[\] floatArray = new float\[\]\{0.1f,0.2f,0.3f\};
> 
>         JSONArray jsonArray4 = JSONArray.fromObject(floatArray);
> 
>         System.out.println("float\[\] floatArray");
> 
>         System.out.println(jsonArray4);
> 
>        
> 
>         String\[\] strArray = new String\[\]\{ "hello","hebut","xiapi"\};
> 
>         JSONArray jsonArray5 = JSONArray.fromObject(strArray);
> 
>         System.out.println("String\[\] strArray");
> 
>         System.out.println(jsonArray5);
> 
>     \}
> 
> \}

【运行结果】

> int\[\] intArray
> 
> \[1,4,5\]
> 
> boolean\[\] boolArray
> 
> \[true,false,true\]
> 
> int\[\]\[\] int2Array
> 
> \[\[1,2\],\[3,4\]\]
> 
> float\[\] floatArray
> 
> \[0.1,0.2,0.3\]
> 
> String\[\] strArray
> 
> \["hello","hebut","xiapi"\]

### 2.3 处理CollectionsToJson ###

【示例代码】

> package com.hebut.jsonlib;
> 
>  
> 
> import java.util.ArrayList;
> 
> import java.util.List;
> 
> import net.sf.json.JSONArray;
> 
> import org.junit.Test;
> 
>  
> 
> public class JsonLib \{ 
> 
>    
> 
>     @Test
> 
>     public void collections2json()\{ 
> 
>         List list1 = new ArrayList();
> 
>         list1.add("first");
> 
>         list1.add("second");
> 
>         JSONArray jsonArray1 = JSONArray.fromObject(list1);
> 
>         System.out.println("List list1");
> 
>         System.out.println(jsonArray1);
> 
>        
> 
>         List<Student> list2 = new ArrayList<Student>();
> 
>         list2.add(new Student("xiapi1","男",10));
> 
>         list2.add(new Student("xiapi2","女",11));
> 
>         list2.add(new Student("xiapi3","男",12));
> 
>         JSONArray jsonArray2 = JSONArray.fromObject(list2);
> 
>         System.out.println("List<Student> list2");
> 
>         System.out.println(jsonArray2);
> 
>     \}
> 
> \}

【运行结果】

> List list1
> 
> \["first","second"\]
> 
> List<Student> list2
> 
> \[\{"age":10,"sex":"男","userName":"xiapi1"\},\{"age":11,"sex":"女","userName":"xiapi2"\},\{"age":12,"sex":"男","userName":"xiapi3"\}\]

### 2.4 处理MapToJson ###

【示例代码】

> package com.hebut.jsonlib;
> 
>  
> 
> import java.util.HashMap;
> 
> import java.util.Map;
> 
> import net.sf.json.JSONObject;
> 
> import org.junit.Test;
> 
>  
> 
> public class JsonLib \{ 
> 
>    
> 
>     @Test
> 
>     public void map2json()\{ 
> 
>         Map map1 = new HashMap();
> 
>         map1.put("name","json");
> 
>         map1.put("bool",Boolean.TRUE);
> 
>         map1.put("int",new Integer(1));
> 
>         map1.put("arr",new String\[\]\{ "a","b"\});
> 
>         map1.put("func","function(i)\{ return this.arr\[i\]; \}");
> 
>         JSONObject jsonObject1 = JSONObject.fromObject(map1);
> 
>         System.out.println("Map map1");
> 
>         System.out.println(jsonObject1);
> 
>        
> 
>         Map<String,Student> map2 = new HashMap<String,Student>();
> 
>         map2.put("k1", new Student("xiapi1","男",10));
> 
>         map2.put("k2", new Student("xiapi2","女",12));
> 
>         map2.put("k3", new Student("xiapi3","男",13));
> 
>         JSONObject jsonObject2 = JSONObject.fromObject(map2);
> 
>         System.out.println("Map<String,Student> map2");
> 
>         System.out.println(jsonObject2);
> 
>     \}
> 
> \}

【运行结果】

> Map map1
> 
> \{"arr":\["a","b"\],"int":1,"name":"json","func":function(i)\{ return this.arr\[i\]; \},"bool":true\}
> 
> Map<String,Student> map2
> 
> \{"k3":\{"age":13,"sex":"男","userName":"xiapi3"\},"k1":\{"age":10,"sex":"男","userName":"xiapi1"\},"k2":\{"age":12,"sex":"女","userName":"xiapi2"\}\}

### 2.5 处理BeanToJson ###

【示例代码】

> package com.hebut.jsonlib;
> 
>  
> 
> import java.text.SimpleDateFormat;
> 
> import java.util.ArrayList;
> 
> import java.util.Date;
> 
> import java.util.List;
> 
>  
> 
> import net.sf.json.JSON;
> 
> import net.sf.json.JSONArray;
> 
> import net.sf.json.JSONObject;
> 
> import net.sf.json.JsonConfig;
> 
> import net.sf.json.processors.JsonValueProcessor;
> 
> import net.sf.json.util.CycleDetectionStrategy;
> 
> import org.junit.Test;
> 
>  
> 
> public class JsonLib \{ 
> 
>    
> 
>     @Test
> 
>     public void bean2json()\{ 
> 
>         Student s1 = new Student("xiapi","男",22);
> 
>         JSONObject jsonObject1 = JSONObject.fromObject(s1);
> 
>         System.out.println("Student s1");
> 
>         System.out.println(jsonObject1);
> 
>        
> 
>         Class c1 = new Class();
> 
>         c1.setName("计算机应用1班");
> 
>         c1.setDate(new Date());
> 
>         JsonConfig config=new JsonConfig();
> 
>         //设置循环策略为忽略
> 
>         config.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);
> 
>         //设置 json转换的处理器用来处理日期类型
> 
>         //凡是反序列化Date类型的对象，都会经过该处理器进行处理
> 
>         config.registerJsonValueProcessor(Date.class,
> 
>                                     new JsonValueProcessor() \{ 
> 
>             //参数1 ：属性名参数2：json对象的值参数3：jsonConfig对象
> 
>             public Object processObjectValue(String arg0, Object arg1,JsonConfig arg2) \{ 
> 
>                 SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
> 
>                 Date d=(Date) arg1;
> 
>                 return sdf.format(d);
> 
>             \}
> 
>             public Object processArrayValue(Object arg0, JsonConfig arg1) \{ 
> 
>                 return null;
> 
>             \}
> 
>         \});
> 
>         List<Student> students = new ArrayList<Student>();
> 
>         students.add(new Student("xiapi1","男",10));
> 
>         students.add(new Student("xiapi2","女",11));
> 
>         students.add(new Student("xiapi3","男",12));
> 
>         c1.setStudents(students);
> 
>         JSONObject jsonObject2 = JSONObject.fromObject(c1,config);
> 
>         System.out.println("Class c1");
> 
>         System.out.println(jsonObject2);
> 
>     \}
> 
> \}

【运行结果】

> Student s1
> 
> \{"age":22,"sex":"男","userName":"xiapi"\}
> 
> Class c1
> 
> \{"date":"2012-05-21 19:19:31","name":"计算机应用1班","students":\[\{"age":10,"sex":"男","userName":"xiapi1"\},\{"age":11,"sex":"女","userName":"xiapi2"\},\{"age":12,"sex":"男","userName":"xiapi3"\}\]\}

### 2.6 处理XmlToJson ###

在处理XML时，需要另添加"xom-1.2.8.jar"包。

下载地址：[http://www.xom.nu/][http_www.xom.nu]

【示例代码】

> package com.hebut.jsonlib;
> 
>  
> 
> import net.sf.json.JSON;
> 
> import net.sf.json.xml.XMLSerializer;
> 
> import org.junit.Test;
> 
>  
> 
> public class JsonLib \{ 
> 
>    
> 
>     @Test
> 
>     public void xml2json()\{ 
> 
>         String s="<student>
> 
>                         <name id='n1'>xiapi</name>
> 
>                         <sex class='s1'>男</sex>
> 
>                         <age>20</age>
> 
>                     </student>";
> 
>         XMLSerializer x =new XMLSerializer();
> 
>         JSON json = x.read(s);
> 
>         System.out.println("XmlToJson");
> 
>         System.out.println(json.toString());
> 
>     \}
> 
> \}

【运行结果】

> 2012-5-21 19:01:03 net.sf.json.xml.XMLSerializer getType
> 
> 信息: Using default type string
> 
> XmlToJson
> 
> \{"name":\{"@id":"n1","\#text":"xiapi"\},"sex":\{"@id":"s1","\#text":"男"\},"age":"20"\}

### 2.7 处理JsonToArrays ###

【示例代码】

> package com.hebut.jsonlib;
> 
>  
> 
> import net.sf.ezmorph.test.ArrayAssertions;
> 
> import net.sf.json.JSONArray;
> 
> import net.sf.json.JSONSerializer;
> 
> import net.sf.json.JsonConfig;
> 
>  
> 
> import org.junit.Test;
> 
>  
> 
> public class JsonLib \{ 
> 
>    
> 
>     @Test
> 
>     public void json2arrays()\{ 
> 
>         String json1 = "\['first','second'\]";
> 
>         JSONArray jsonArray1 = (JSONArray) JSONSerializer.toJSON(json1);
> 
>         JsonConfig jsonConfig = new JsonConfig();
> 
>         jsonConfig.setArrayMode(JsonConfig.MODE\_OBJECT\_ARRAY);
> 
>         Object\[\] output1 = (Object\[\]) JSONSerializer.toJava(jsonArray1, jsonConfig);
> 
>         Object\[\] expected = new Object\[\] \{ "first", "second" \};
> 
>         ArrayAssertions.assertEquals(expected, output1);
> 
>         System.out.println("Object\[\]");
> 
>         System.out.println(output1.length);
> 
>         System.out.println(output1\[1\]);
> 
>        
> 
>         String json2 ="\[\[1,2\],\[3,4\]\]";
> 
>         JSONArray jsonArray2 = JSONArray.fromObject(json2);
> 
>         Object\[\]\[\] output2 = (Object\[\]\[\])JSONArray.toArray(jsonArray2);
> 
>         System.out.println("Object\[\]\[\]");
> 
>         System.out.println(output2.length);
> 
>         System.out.println(output2\[0\]\[0\]);
> 
>     \}
> 
> \}

【运行结果】

> Object\[\]
> 
> 2
> 
> second
> 
> Object\[\]\[\]
> 
> 2
> 
> 1

### 2.8 处理JsonToCollections ###

【示例代码】

> package com.hebut.jsonlib;
> 
>  
> 
> import java.util.List;
> 
> import net.sf.json.JSONArray;
> 
> import net.sf.json.JSONSerializer;
> 
> import org.junit.Test;
> 
>  
> 
> public class JsonLib \{ 
> 
>    
> 
>     @Test
> 
>     public void json2collections()\{ 
> 
>         String json1 = "\['first','second'\]";
> 
>         JSONArray jsonArray1 = (JSONArray) JSONSerializer.toJSON(json1);
> 
>         List output1 = (List) JSONSerializer.toJava(jsonArray1);
> 
>         System.out.println("List");
> 
>         System.out.println(output1.get(0));
> 
>        
> 
>         String json2 = "\[\{'age':10,'sex':'男','userName':'xiapi1'\},
> 
>                         \{'age':11,'sex':'女','userName':'xiapi2'\}\]";
> 
>         JSONArray jsonArray2 = JSONArray.fromObject(json2);
> 
>         List<Student> output2 = JSONArray.toList(jsonArray2,Student.class);
> 
>         System.out.println("List<Student>");
> 
>         System.out.println(output2.size());
> 
>         System.out.println(output2.get(0));
> 
>         System.out.println(output2.get(0).getUserName());
> 
>     \}
> 
> \}

【运行结果】

> List
> 
> first
> 
> List<Student>
> 
> 2
> 
> com.hebut.jsonlib.Student@16f144c
> 
> xiapi1

### 2.9 处理JsonToMap ###

【示例代码】

> package com.hebut.jsonlib;
> 
>  
> 
> import java.util.Date;
> 
> import java.util.HashMap;
> 
> import java.util.Map;
> 
> import net.sf.ezmorph.Morpher;
> 
> import net.sf.ezmorph.MorpherRegistry;
> 
> import net.sf.ezmorph.bean.BeanMorpher;
> 
> import net.sf.ezmorph.test.ArrayAssertions;
> 
> import net.sf.json.JSONObject;
> 
> import net.sf.json.JSONSerializer;
> 
> import net.sf.json.util.JSONUtils;
> 
> import net.sf.json.xml.XMLSerializer;
> 
>  
> 
> import org.junit.Test;
> 
>  
> 
> public class JsonLib \{ 
> 
>  
> 
>     @Test
> 
>     public void json2map()\{ 
> 
>         String json1 ="\{'arr':\['a','b'\],'int':1,
> 
>                         'name':'json','bool':true\}";
> 
>         JSONObject jsonObject1 = JSONObject.fromObject(json1);
> 
>         Map typeMap1 = new HashMap();
> 
>         typeMap1.put("arr", String\[\].class);
> 
>         typeMap1.put("int", Integer.class);
> 
>         typeMap1.put("name", String.class);
> 
>         typeMap1.put("bool", Boolean.class);
> 
>         Map output1 = (Map)JSONObject.toBean(jsonObject1, Map.class,typeMap1);
> 
>         System.out.println("Map");
> 
>         System.out.println(output1.size());
> 
>         System.out.println(output1.get("name"));
> 
>         System.out.println(output1.get("arr"));
> 
>        
> 
>         String json2 ="\{'k1':\{'age':10,'sex':'男','userName':'xiapi1'\},
> 
>                         'k2':\{'age':12,'sex':'女','userName':'xiapi2'\}\}";
> 
>         JSONObject jsonObject2 = JSONObject.fromObject(json2);
> 
>         Map<String,Class<?>> typeMap2 =new HashMap<String,Class<?>>();
> 
>         Map<String,Student> output2 = (Map<String,Student>)JSONObject.toBean(jsonObject2,Map.class,typeMap2);
> 
>         System.out.println("Map<String,Student>");
> 
>         System.out.println(output2.size());
> 
>         System.out.println(output2.get("k1"));
> 
>        
> 
>         //先往注册器中注册变换器，需要用到ezmorph包中的类
> 
> 　　　　MorpherRegistry morpherRegistry = JSONUtils.getMorpherRegistry();
> 
> 　　　　Morpher dynaMorpher = new BeanMorpher(Student.class,morpherRegistry);
> 
> 　　　　morpherRegistry.registerMorpher(dynaMorpher);
> 
>  
> 
>         System.out.println(((Student)morpherRegistry.morph(Student.class,output2.get("k2"))).getUserName());
> 
>     \}
> 
> \}

【运行结果】

> Map
> 
> 4
> 
> json
> 
> \[a, b\]
> 
> Map<String,Student>
> 
> 2
> 
> net.sf.ezmorph.bean.MorphDynaBean@5b8827\[
> 
> \{sex=男, age=10, userName=xiapi1\}
> 
> \]
> 
> xiapi2

### 2.10 处理JsonToBean ###

【示例代码】

> package com.hebut.jsonlib;
> 
>  
> 
> import net.sf.ezmorph.Morpher;
> 
> import net.sf.ezmorph.MorpherRegistry;
> 
> import net.sf.ezmorph.bean.BeanMorpher;
> 
> import net.sf.ezmorph.object.DateMorpher;
> 
> import net.sf.json.JSONObject;
> 
> import net.sf.json.JSONSerializer;
> 
> import net.sf.json.util.JSONUtils;
> 
>  
> 
> import org.junit.Test;
> 
>  
> 
> public class JsonLib \{ 
> 
>    
> 
>     @Test
> 
>     public void json2bean()\{ 
> 
>         //简单对象
> 
>         String json1 = "\{'age':22,'sex':'男','userName':'xiapi'\}";
> 
>         JSONObject jsonObject1 = JSONObject.fromObject(json1);
> 
>         Student output1 = (Student)JSONObject.toBean(jsonObject1,Student.class);
> 
>         System.out.println("Student");
> 
>         System.out.println(output1.getUserName());
> 
>        
> 
>         //复杂对象
> 
>         String json2 = "\{'date':'2012-05-21 13:03:11',
> 
>                             'name':'计算机应用1班',
> 
>                 'students':\[\{'age':10,'sex':'男','userName':'xiapi1'\},
> 
>                             \{'age':11,'sex':'女','userName':'xiapi2'\}\]\}";
> 
>         //转为日期
> 
>         String\[\] DATE\_FORMAT = \{ "yyyy-MM-dd HH:mm:ss" \};
> 
>         MorpherRegistry morpherRegistry = JSONUtils.getMorpherRegistry();
> 
>         morpherRegistry.registerMorpher(new DateMorpher(DATE\_FORMAT));
> 
>         JSONObject jsonObject2 = JSONObject.fromObject(json2);
> 
>         Map typeMap1 = new HashMap();
> 
>         typeMap1.put("date", Date.class);
> 
>         typeMap1.put("name",String.class);
> 
>         typeMap1.put("students", Student.class);
> 
>         Class output2 = (Class)JSONObject.toBean(jsonObject2,Class.class,typeMap1);
> 
>         System.out.println("Class");
> 
>         System.out.println(output2.getName());
> 
>         System.out.println(output2.getDate());
> 
>         System.out.println(output2.getStudents().get(0).getUserName());
> 
>     \}
> 
> \}

【运行结果】

> Student
> 
> xiapi
> 
> Class
> 
> 计算机应用1班
> 
> Mon May 21 13:03:11 CST 2012
> 
> xiapi1

### 2.11 处理JsonToXml ###

【示例代码】

> package com.hebut.jsonlib;
> 
>  
> 
> import net.sf.json.JSONObject;
> 
> import net.sf.json.xml.XMLSerializer;
> 
> import org.junit.Test;
> 
>  
> 
> public class JsonLib \{ 
> 
>    
> 
>     @Test
> 
>     public void json2xml()\{ 
> 
>         String json1 = "\{'age':22,'sex':'男','userName':'xiapi'\}";
> 
>         JSONObject jsonObj = JSONObject.fromObject(json1);
> 
> 　　　　XMLSerializer x = new XMLSerializer();
> 
> 　　　　String xml = x.write(jsonObj);
> 
> 　　　　System.out.println("XML");
> 
> 　　　　System.out.println(xml);
> 
>     \}
> 
> \}

【运行结果】

> XML
> 
> <?xml version="1.0" encoding="UTF-8"?>
> 
> <o><age type="number">22</age><sex type="string">男</sex><userName type="string">xiapi</userName></o>

### 2.12 对象JSONArray ###

【示例代码】

> package com.hebut.jsonlib;
> 
>  
> 
> import net.sf.json.JSONArray;
> 
> import org.junit.Test;
> 
>  
> 
> public class JsonLib2 \{ 
> 
>  
> 
>     @Test
> 
>     public void testJSONArray() \{ 
> 
>         JSONArray jsonArray = new JSONArray();
> 
>         jsonArray.add(0,"第一个值");
> 
>         jsonArray.add(1,"第二个值");
> 
>         jsonArray.add(2,"第三个值");
> 
>         System.out.print(jsonArray.toString());
> 
>     \}
> 
> \}

【运行结果】

> \["第一个值","第二个值","第三个值"\]

### 2.13 对象JSONObject ###

【示例代码】

> package com.hebut.jsonlib;
> 
>  
> 
> import net.sf.json.JSONArray;
> 
> import net.sf.json.JSONObject;
> 
>  
> 
> import org.junit.Test;
> 
>  
> 
> public class JsonLib2 \{ 
> 
>  
> 
>     @Test
> 
>     public void testJSONObject() \{ 
> 
>         JSONObject jsonObject = new JSONObject();
> 
>         jsonObject.put("name", "xiapi");
> 
>         jsonObject.put("age", 20);
> 
>         jsonObject.put("sex", "男");
> 
>         JSONArray jsonArray = new JSONArray();
> 
>         jsonArray.add("唱歌");
> 
>         jsonArray.add("摄影");
> 
>         jsonArray.add("象棋");
> 
>         jsonObject.element("hobby",jsonArray);
> 
>         System.out.println(jsonObject);
> 
>     \}
> 
> \}

【运行结果】

> \{"name":"xiapi","age":20,"sex":"男","hobby":\["唱歌","摄影","象棋"\]\}

## 3、日期转换 ##

json-lib转换出来的日期类型格式：

> "birthday":\{"date":1,"day":0,"hours":0,"minutes":0,"month":7,"nanos":0,"seconds":0,"time":1280592000000,"timezoneOffset":-480,"year":110\}

那么我们如果想要"yyyy-MM-dd HH:mm:ss "这种格式的怎么办呢？

### 3.1 三种解决方案 ###

都必须使用jsonConfig对象进行处理

（1）使用jsonConfig的setExcludes的方法进行过滤，将所需要过滤的字段名传入setExcludes方法。

>     public void objectToJson()\{
> 
>         //创建对象
> 
>         Emp emp= new Emp(\*\*\*\*);
> 
>         //创建jsonConfig对象
> 
>         JsonConfig config=new JsonConfig();
> 
>         //设置过滤字段
> 
>         config.setExcludes(new String\[\]\{"dept"\});
> 
>         String s=JSONObject.fromObject(emp,config).toString();
> 
>         System.out.println(s);
> 
>     \}

（2）使用jsonConfig的setJsonPropertyFilter进行属性过滤，过滤器中返回true表示过滤该字段，返回false表示可以转换该字段。

>     public void objectToJson()\{
> 
>         //创建对象
> 
>         Emp emp= new Emp(\*\*\*\*);
> 
>         //创建jsonConfig对象
> 
>         JsonConfig config=new JsonConfig();
> 
>         //设置过滤字段
> 
>         config.setJsonPropertyFilter(new PropertyFilter() \{
> 
>             public boolean apply(Object arg0, String arg1, Object arg2) \{
> 
>                 if("dept".equals(arg1))\{
> 
>                     return true;
> 
>                 \}
> 
>                 return false;
> 
>             \}
> 
>         \});
> 
>         String s=JSONObject.fromObject(emp,config).toString();
> 
>         System.out.println(s);
> 
>     \}

上述两种解决方案可以解决部分问题，但是json-lib使用代理进行反射，所以如果想要部门表的信息，而去过滤部门表的员工对象，这样还是解决不了。这样可以使用更简单有效的方案

（3）使用jsonConfig的setCycleDetectionStrategy()方法进行忽略死循环。

使用jsonConfig的registerJsonValueProcessor()进行属性转换设置。

>     public void objectToJson()\{
> 
>         //创建对象
> 
>         Emp emp= new Emp(\*\*\*\*);
> 
>         //创建jsonConfig对象
> 
>         JsonConfig config=new JsonConfig();
> 
>         //设置循环策略为忽略 解决json最头疼的问题 死循环
> 
>         config.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);
> 
>         //设置 json转换的处理器 用来处理日期类型
> 
>         //凡是反序列化Date类型的对象，都会经过该处理器进行处理
> 
>         config.registerJsonValueProcessor(Date.class, new JsonValueProcessor() \{
> 
>             //参数1 ：属性名 参数2：json对象的值 参数3：jsonConfig对象
> 
>             public Object processObjectValue(String arg0, Object arg1, JsonConfig arg2) \{
> 
>                 SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
> 
>                 Date d=(Date) arg1;
> 
>                 return sdf.format(d);
> 
>             \}
> 
>             public Object processArrayValue(Object arg0, JsonConfig arg1) \{
> 
>                 return null;
> 
>             \}
> 
>         \});
> 
>         String s=JSONObject.fromObject(emp,config).toString();
> 
>         System.out.println(s);
> 
>     \}

这种方案可以解决死循环问题和日期格式化的问题。

结果：

> \{"birthday":"2010-08-01 00:00:00","dept":\{"depid":1,"depname":"开发部","emps":\[\{"birthday":"2009-08-01 00:00:00","dept":null,"empid":30,"empname":"田七"\},null\]\},"empid":27,"empname":"王五"\}

### 3.2 封装函数方案 ###

> public static String convert2Json2(Object object) \{ 
> 
>     JsonConfig jsonConfig = new JsonConfig();
> 
>     jsonConfig.registerJsonValueProcessor(java.util.Date.class,
> 
>             new JsonValueProcessor() \{ 
> 
>                 private final String format = "yyyy-MM-dd hh:mm:ss";
> 
>  
> 
>                 public Object processArrayValue(Object object,
> 
>                         JsonConfig jsonConfig) \{ 
> 
>                     return null;
> 
>                 \}
> 
>  
> 
>                 public Object processObjectValue(String string,
> 
>                         Object object, JsonConfig jsonConfig) \{ 
> 
>                     if (null == object) \{ 
> 
>                         return "";
> 
>                     \} else \{ 
> 
>                         if (object instanceof java.util.Date) \{ 
> 
>                             SimpleDateFormat simpleDateFormat = new
> 
>                                 SimpleDateFormat(format);
> 
>                             String dateStr = simpleDateFormat
> 
>                                     .format(object);
> 
>                             return dateStr;
> 
>                         \}
> 
>                     \}
> 
>  
> 
>                     return object.toString();
> 
>                 \}
> 
>             \});
> 
>  
> 
>     if (object instanceof String)
> 
>         return object.toString();
> 
>     if ((object instanceof Object\[\]) || (object instanceof List)) \{ 
> 
>         JSONArray jsonObject = JSONArray.fromObject(object, jsonConfig);
> 
>         return jsonObject.toString() + '\\n';
> 
>     \} else \{ 
> 
>         JSONObject jsonObject = JSONObject.fromObject(object, jsonConfig);
> 
>         return jsonObject.toString() + '\\n';
> 
>     \}
> 
> \}

[Java]: http://lib.csdn.net/base/17
[http_json-lib.sourceforge.net]: http://json-lib.sourceforge.net/
[JavaScript]: http://lib.csdn.net/base/18
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