Posted on 2006-10-06 20:18
Nomad 阅读(1773)
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JSON.org包里的方法对JavaBean没有支持，而
JSON-lib虽然功能丰富，但是依赖很多其它的包，为了方便我就写了一个类继承于JSONObject，方便JavaBean的使用。
源代码：
package net.jialing;
import java.lang.reflect.Method;
import java.util.StringTokenizer;
/**
* 支持JavaBean的JSONObject
*
* @author Michael
* @since 2006-10-4
* @version 0.1a
*/
public class JSONReflectObject extends JSONObject {
public JSONReflectObject() {
super();
}
/**
* 构造函数
* @param object 需要得到信息的JavaBean
* @param names 属性的字符串数组
*/
public JSONReflectObject(Object object, String names[]) {
this();
for (int i = 0; i < names.length; i += 1) {
try {
String name = names[i];
setProperty(object,name);
} catch (Exception e) {
/* forget about it */
}
}
}
/**
* 得到JavaBean的某个属性，支持加.得到属性的属性
*
* @param owner 对象
* @param property 属性名
* @return 方法返回值
* @throws Exception
*/
private void setProperty(Object owner, String property)
throws Exception {
Class ownerClass;
Object[] args = null;
Class[] argsClass = null;
int i=0,loop=0; //i表示第几层JSOBObject，loop表示循环了几次
StringTokenizer st = new StringTokenizer(property,".");
JSONObject jo[] = new JSONObject[st.countTokens()-1];
for(int x=0,y=jo.length;x<y;x++) {
jo[x] = new JSONObject();
}
while (st.hasMoreTokens()) {
String propertyName = st.nextToken();
ownerClass = owner.getClass();
String methodName = "get"
+ propertyName.substring(0,1).toUpperCase()
+ propertyName.substring(1);
Method method = ownerClass.getMethod(methodName, argsClass);
owner = method.invoke(owner, args);
if(st.hasMoreTokens()) {
if( loop == 0)
this.put(propertyName,jo[0]);
else
jo[i].put(propertyName, jo[++i]);
loop++;
}
else {
if(loop==0)
this.put(propertyName, owner.toString());
else
jo[i].put(propertyName, owner.toString());
}
}
}
}
测试准备：
public class Student {
private String name;
private String email;
private Birthday birthday;
getter and setter
}
public class Birthday {
private Year year;
private String month;
private String day;
public Birthday(String year,String month,String day){
this.year = new Year(year);
this.month = month;
this.day = day;
}
getter and setter
}
public class Year {
private String y;
getter and setter
public Year(String y){
this.y = y;
}
} 测试：
public class Test {
public String singleObject() throws JSONException {
Student s = new Student();
s.setName("Jack");
s.setEmail("jack@a.com");
s.setBirthday(new Birthday("1990","12","30"));
String[] params = {"name","email","birthday.year.y"};
JSONReflectObject jo = new JSONReflectObject(s,params);
return jo.toString();
}
public static void main(String args[]) throws Exception{
test t = new test();
System.out.println(t.singleObject());
}
}
1.首先新建一个Student
2.设置name，email，birthday属性
3.把要打印出的属性放在字符串数组里，支持加"."得到属性的属性
4.建立JSONReflectObject，将要输出的对象和属性数组作为参数
5.打印：{"email":"jack@a.com","name":"Jack","birthday":{"year":{"y":"1990"}}}