android怎么将javabean转换成json

android怎么将javabean转换成json

前提条件是javaBean必须有getter和setter方法而且，必须有无参的构造方法
package com.cn.parse_json;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.lang.reflect.Field;
import org.json.JSONObject;
import android.os.Environment;
import android.util.Log;
import android.widget.Toast;
public class ParseJson2BeanUtils {
public static T parseJson2Bean(JSONObject object,Class clazz ) throws Exception{
FileInputStream fis = new FileInputStream("/mnt/sdcard/json.txt");
int len = fis.available();
byte[] buffer = new byte[len];
fis.read(buffer);
object = new JSONObject(new String(buffer));
T newInstance = null;
Field[] fields = clazz.getFields();
//只要保证clazz有一个无参的public构造方法就不可能发生异常
try {
newInstance = clazz.newInstance();
} catch (Exception e) {
e.printStackTrace();
}
for(int i = 0;i< fields.length;i++){
String name = fields[i].getName();
//不可能发生的异常
try {

String jsonName = name.replaceFirst(name.substring(0, 1), name.substring(0, 1).toUpperCase());
if(object.has(jsonName)){
if(jsonName.equals("ResultCode")){
fields[i].set(newInstance, object.getInt(jsonName));
}else{
fields[i].set(newInstance, object.getString(jsonName));
}
Log.i("name", name+"****");

}
//Log.i("name", jsonName+":"+object.has(jsonName)+object.getString(jsonName));

} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

return newInstance;
}
}