JSON简单例子(Json-lib)

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到http://json-lib.sourceforge.net下载json-lib-1.1-jdk15.jar，运行json还需要的包有：commons-lang.jar、commons-logging.jar，commons-beanutils.jar、xom-1.0-2005-01-05.jar、ezmorph-1.0.1.jar，可在http://www.docjar.com搜索下载。

//第一个案例：java转换成JSON字符串

@Test

public void fromObject(){

//将java对象转换成JSON字符串

Teacher teacher=new Teacher();

teacher.setName("aa");

teacher.setSex("男");

teacher.setAge(28);

teacher.setBirth(new Date());

//JSON字符串

//{name:"aa",sex:"男",age:"28",birth:"...."}

//需要引入类库文件

System.out.println(JSONObject.fromObject(teacher));

}

{"age":28,"birth":{"date":28,"day":2,"hours":9,"minutes":32,"month":1,"seconds":5,"time":1330392725328,"timezoneOffset":-480,"year":112},"name":"aa","sex":"男"}

//将java集合转换成JSON字符串

@Test

public void fromVector(){

List<Teacher> teas=new ArrayList<Teacher>();

for(int i=0;i<3;i++){

Teacher teacher=new Teacher();

teacher.setName("aa");

teacher.setSex("男");

teacher.setAge(28);

teacher.setBirth(new Date());

teas.add(teacher);

}

//teas集合

System.out.println(JSONArray.fromObject(teas).toString());

}

[{"age":28,"birth":{"date":28,"day":2,"hours":9,"minutes":29,"month":1,"seconds":18,"time":1330392558562,"timezoneOffset":-480,"year":112},"name":"aa","sex":"男"},{"age":28,"birth":{"date":28,"day":2,"hours":9,"minutes":29,"month":1,"seconds":18,"time":1330392558562,"timezoneOffset":-480,"year":112},"name":"aa","sex":"男"},{"age":28,"birth":{"date":28,"day":2,"hours":9,"minutes":29,"month":1,"seconds":18,"time":1330392558562,"timezoneOffset":-480,"year":112},"name":"aa","sex":"男"}]

// JSON字符串转换为对象

@Test

public void fromJsonObject() {

// 第一步：定义成字符串

String teaObj = "{\"age\":28,\"birth\":{\"date\":28,\"day\":2,\"hours\":9,\"minutes\":20,\"month\":1,\"seconds\":25,\"time\":1330392025906,\"timezoneOffset\":-480,\"year\":112},\"name\":\"aa\",\"sex\":\"男\"}";

// 第二步：使用JsonObject.fromObject方法将其字符串转换为JsonObject对象

JSONObject jsonObj = JSONObject.fromObject(teaObj);

// 第三步：调用JsonObject的toBean的方法，将其转换成一个Object对象当取单个的时候:

//System.out.println("uname:"+jsonObj.get("name"));

//System.out.println("uname:"+PropertyUtils.getProperty(Teacher,"uname"));

Teacher teac = (Teacher) JSONObject.toBean(jsonObj,Teacher.class);

System.out.println(teac.toString());

}

Teacher [age=28, birth=Tue Feb 28 09:20:25CST 2012, name=aa, sex=男, stus=null]

// 将数组的字符串转换成集合对象

@SuppressWarnings("unchecked")

@Test

public void fromJsonArray() {

// 声明字符串

String teaArr = "[{\"age\":28,\"birth\":{\"date\":28,\"day\":2,\"hours\":9,\"minutes\":28,\"month\":1,\"seconds\":44,\"time\":1330392524093,\"timezoneOffset\":-480,\"year\":112},\"name\":\"aa\",\"sex\":\"男\"},{\"age\":28,\"birth\":{\"date\":28,\"day\":2,\"hours\":9,\"minutes\":28,\"month\":1,\"seconds\":44,\"time\":1330392524093,\"timezoneOffset\":-480,\"year\":112},\"name\":\"aa\",\"sex\":\"男\"},{\"age\":28,\"birth\":{\"date\":28,\"day\":2,\"hours\":9,\"minutes\":28,\"month\":1,\"seconds\":44,\"time\":1330392524093,\"timezoneOffset\":-480,\"year\":112},\"name\":\"aa\",\"sex\":\"男\"}]";

// 调用JsonArray.fromObject方法将其字符串转成一个JsonArray'对象

JSONArray jsonArra = JSONArray.fromObject(teaArr);

// 第三步：调用

List<Teacher> teas = (List<Teacher>) JSONArray.toCollection(jsonArra,

Teacher.class);

for (Teacher tea : teas) {

System.out.println(tea.toString());

}

Teacher [age=28, birth=Tue Feb28 09:28:44 CST 2012, name=aa, sex=男, stus=null]

Teacher [age=28, birth=Tue Feb 28 09:28:44CST 2012, name=aa, sex=男, stus=null]

//将java对象转换为json字符的案例

@Test

public void fromObject1(){

// 将java对象转换为JSON数据

Teacher teacher = new Teacher();

teacher.setName("老王");

teacher.setAge(23);

teacher.setBirth(new Date());

List<Student> seas = new ArrayList<Student>();

for (int i = 0; i < 3; i++) {

Student stu = new Student();

stu.setName("熊熊"+i);

seas.add(stu);

}

teacher.setStus(seas);

System.out.println(JSONObject.fromObject(teacher).toString());

}

{"age":23,"birth":{"date":28,"day":2,"hours":13,"minutes":50,"month":1,"seconds":22,"time":1330408222921,"timezoneOffset":-480,"year":112},"name":"老王","sex":"","stus":[{"name":"熊熊0"},{"name":"熊熊1"},{"name":"熊熊2"}]}

String json = "{name=\"json\",bool:true,int:1,double:2.2,func:function(a){ return a; },array:[1,2]}";
JSONObject jsonObject = JSONObject.fromObject( json );
Object bean = JSONObject.toBean( jsonObject );

System.out.print(jsonObject.get( "name" )),System.out.print(PropertyUtils.getProperty( bean, "name" ) ); 一样取值
jsonObject.get( "bool" )|| PropertyUtils.getProperty( bean, "bool" ) );
jsonObject.get( "int" )||PropertyUtils.getProperty( bean, "int" ) );
jsonObject.get( "double" )|| PropertyUtils.getProperty( bean, "double" ) );
jsonObject.get( "func" )|| PropertyUtils.getProperty( bean, "func" ) );
List expected = JSONArray.toList( jsonObject.getJSONArray( "array" ) );
expected, (List) PropertyUtils.getProperty( bean, "array" ) );