Json系列之一 bean To json（JSONObject类详解）

使用json-lib-2.4-jdk15.jar，依赖的包
1）commons-lang-2.6.jar
2）commons-beanutils-1.8.3.jar
3）commons-collections-3.2.1.jar
4）commons-logging-1.1.1.jar
5）ezmorph-1.0.6.jar

bean to json相对是比较简单的，基本都采用以下办法:
   方式一（常用）
   /**
    * Creates a JSONObject.<br>
    * Inspects the object type to call the correct JSONObject factory method.
    * Accepts JSON formatted strings, Maps, DynaBeans and JavaBeans.
    *
    * @param object
    * @throws JSONException if the object can not be converted to a proper
    *         JSONObject.
    */
   public static JSONObject fromObject( Object object ) 

   方式二（过滤，特殊转换时使用）
   /**
    * Creates a JSONObject.<br>
    * Inspects the object type to call the correct JSONObject factory method.
    * Accepts JSON formatted strings, Maps, DynaBeans and JavaBeans.
    *
    * @param object
    * @throws JSONException if the object can not be converted to a proper
    *         JSONObject.
    */
   public static JSONObject fromObject( Object object, JsonConfig jsonConfig )

   例子代码，很复杂的数据类型:
   package json;

import java.util.Date;
import java.util.List;
import java.util.Map;

public class Person {
	private String name;
	private Date birthDay;
	private int age;
	private String nullStr;
	private String emptyStr;
	private boolean isLive;
	private List<Address> addresses;
	private Address baseAddress;
	private Map attrs;
	private Map sameTest;

	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Date getBirthDay() {
		return birthDay;
	}
	public void setBirthDay(Date birthDay) {
		this.birthDay = birthDay;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}

	public boolean isLive() {
		return isLive;
	}
	public void setLive(boolean isLive) {
		this.isLive = isLive;
	}
	public List<Address> getAddresses() {
		return addresses;
	}
	public void setAddresses(List<Address> addresses) {
		this.addresses = addresses;
	}
	public Map getAttrs() {
		return attrs;
	}
	public void setAttrs(Map attrs) {
		this.attrs = attrs;
	}
	public String getNullStr() {
		return nullStr;
	}
	public void setNullStr(String nullStr) {
		this.nullStr = nullStr;
	}
	public String getEmptyStr() {
		return emptyStr;
	}
	public void setEmptyStr(String emptyStr) {
		this.emptyStr = emptyStr;
	}
	public Map getSameTest() {
		return sameTest;
	}
	public void setSameTest(Map sameTest) {
		this.sameTest = sameTest;
	}
	public Address getBaseAddress() {
		return baseAddress;
	}
	public void setBaseAddress(Address baseAddress) {
		this.baseAddress = baseAddress;
	}

}

package json;

import java.util.List;

public class Address {
	private String address;
	private List<Person> sameTest;

	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

	public List<Person> getSameTest() {
		return sameTest;
	}

	public void setSameTest(List<Person> sameTest) {
		this.sameTest = sameTest;
	}

}

    public static void main(String[] args) {
		 //一 object to json
		 String returnString = null;
		 Person p = new Person();
		 p.setAge(1);//验证数字
		 p.setBirthDay(new Date(System.currentTimeMillis()));//验证日期
		 p.setLive(true);//验证布尔类型
		 p.setName("xxx");//验证字符串
		 p.setNullStr(null);//验证null
		 p.setEmptyStr("");//验证“”字符串

		 Address address = new Address();
		 address.setAddress("base address");

		 p.setBaseAddress(address);//基本的bean类型

		 List<Address> list = new ArrayList<Address>();
		 Address address1 = new  Address();
		 address1.setAddress("address1");
		 Person sameTestPerson = new Person();
		 sameTestPerson.setName("sameName");
		 List<Person> sameNameList = new ArrayList<Person>();
		 sameNameList.add(sameTestPerson);
		 address1.setSameTest(sameNameList);//验证相同名字测试
		 list.add(address1);

		 Address address2 = new  Address();
		 address2.setAddress("address2");
		 list.add(address2);

		 p.setAddresses(list);//验证list集合

		 Map attrs = new HashMap();
		 attrs.put("key1", "value1");
		 attrs.put("key2", "value2");

		 p.setAttrs(attrs);//验证map集合

		 Map sameTest = new HashMap();
		 sameTest.put("sameName1", "sameNamevalue1");
		 sameTest.put("sameName2", "sameNamevalue2");
		 p.setSameTest(sameTest);//验证相同名字测试

		 returnString = JSONObject.fromObject(p).toString();
	}

	这些对象及产生的json数据会为 json to bean的博文服务。