package com.ObjectToJson;

import java.lang.reflect.Field;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.util.ArrayList;

import java.util.Iterator;

public class ObjectToJson {

public  static String ObjListToJson(ArrayList> list){

StringBuilder build=new StringBuilder();

//迭代器

Iterator> iterator=list.iterator();

build.append("[");

String separate="";

while(iterator.hasNext()){

build.append(separate);

//object转json字符串

String str=ObjToJson(iterator.next());

build.append(str);

separate=",";

}

build.append("]");

return build.toString();

}

@SuppressWarnings("unchecked")

public  static String ObjToJson(Object obj){

StringBuilder build=new StringBuilder();

build.append("{");

@SuppressWarnings("rawtypes")

Class cla=null;

try {

//反射加载类

cla=Class.forName(obj.getClass().getName());

} catch (ClassNotFoundException e) {

System.out.println(obj.getClass().toString().concat(" 未找到这个类"));

e.printStackTrace();

return null;

}

StringBuffer methodname=new StringBuffer();

//获取java类的变量

Field[] fields=cla.getDeclaredFields();

String separate="";

for(Field temp:fields){

build.append(separate);

build.append("\"");

build.append(temp.getName());

build.append("\":");

methodname.append("get");

methodname.append(temp.getName().substring(0,1).toUpperCase());

methodname.append(temp.getName().substring(1));

build.append("\"");

Method method=null;

try {

//获取java的get方法

method=cla.getMethod(methodname.toString());

} catch (NoSuchMethodException | SecurityException e) {

methodname.setLength(0);

e.printStackTrace();

}

try {

//执行get方法，获取变量参数的直。

build.append(method.invoke(obj));

} catch (IllegalAccessException e) {

e.printStackTrace();

} catch (IllegalArgumentException e) {

e.printStackTrace();

} catch (InvocationTargetException e) {

e.printStackTrace();

}

build.append("\"");

methodname.setLength(0);

separate=",";

}

build.append("}");

return build.toString();

}

}