【反射】解析json 为例

package com.masque.json;

import java.util.Date;
/**
*
* @title: 实体信息
* @description: json对应封装的实体
* @className: Person.java
* @author: masque
* @createDate: 2013-7-27
* @version: 1.0
*/
public class Person {
private String name;
private Date birthday;
private Short sex;
private Boolean isMarry;
private Double high;
private Float weight;
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 Short getSex() {
return sex;
}
public void setSex(Short sex) {
this.sex = sex;
}
public Boolean getIsMarry() {
return isMarry;
}
public void setIsMarry(Boolean isMarry) {
this.isMarry = isMarry;
}
public Double getHigh() {
return high;
}
public void setHigh(Double high) {
this.high = high;
}
public Float getWeight() {
return weight;
}
public void setWeight(Float weight) {
this.weight = weight;
}

}

package com.masque.json;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;
/**
*
* @title: 反射
* @description: 用来解析json并封装数据
* @className: ObjToObj.java
* @createDate: 2013-7-27
* @version: 1.0
*/
public class ObjToObj {

@SuppressWarnings("all")
public static void main(String[] args) {
//实体对应的字符串形式
String personStr = "{'name':'xiao','birthday':'1989-02-22','sex':'1','isMarry':'false','high':'165.5','weight':'60.55'}";
int flag = 1;
//想将字符串解析成Map
Map<String,String> inMap = new HashMap<String, String>();
while(flag!=-1){
flag = personStr.indexOf("','");
if(flag==-1) continue;
String pro = personStr.substring(1,flag+1);
personStr = personStr.substring(flag+2);
String [] pp = pro.replaceAll("'", "").split(":");
inMap.put(pp[0], pp[1]);
}

Iterator<String> it = inMap.keySet().iterator();
Class obj=null;
Object a = null;
try {
obj = Class.forName("com.masque.json.Person");//反射得到类
a = obj.newInstance();//实例化对象
while (it.hasNext()) {
String key = it.next();
Method[] methods = obj.getMethods();//得到所有方法的对象数组
String m = key.substring(0,1).toUpperCase()+key.substring(1);
for (int i = 0; i < methods.length; i++) {
if(methods[i].getName().equals("get"+m)){//get方法才有返回值！
//得到返回值类型
String returnType = methods[i].getReturnType().getSimpleName();
System.out.println(returnType);
Method method = null;
//通过判断属性的类型来转换到对应的对象
if(returnType.equals("Date")){
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
method = obj.getDeclaredMethod("set"+m, Date.class);
method.invoke(a,format.parse(inMap.get(key)));
}
if(returnType.equals("Short")){
method = obj.getDeclaredMethod("set"+m, Short.class);
method.invoke(a,Short.parseShort(inMap.get(key)));
}
if(returnType.equals("Boolean")){
method = obj.getDeclaredMethod("set"+m, Boolean.class);
method.invoke(a,Boolean.parseBoolean(inMap.get(key)));
}
if(returnType.equals("Double")){
method = obj.getDeclaredMethod("set"+m, Double.class);
method.invoke(a,Double.parseDouble(inMap.get(key)));
}
if(returnType.equals("Float")){
method = obj.getDeclaredMethod("set"+m, Float.class);
method.invoke(a,Float.parseFloat(inMap.get(key)));
}
if(returnType.equals("String")){
method = obj.getDeclaredMethod("set"+m, String.class);
method.invoke(a,inMap.get(key));
}
}
}
}
} catch (SecurityException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
}catch (ClassNotFoundException e) {
e.printStackTrace();
}catch (InstantiationException e) {
e.printStackTrace();
}

System.out.println(((Person)a).getName()+"省略。。。");
}
}