android中Json数据保存方式

package com.example.savejsonproject;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintStream;
import java.util.Date;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.view.Menu;
public class MainActivity extends Activity {
private String company="宜昌静哥科技软件学院";
private String address="湖北省宜昌市宜都市枝城镇";
private String telephone="18671736137";
private String[] namedata={"李元静","冯新尧","何帆"};
private int[] agedata={21,22,21};
private boolean[] marrieddata={true,false,true};
private double[] salarydata={8000.0,8000.0,8000.0};
private Date[] birthdaydata={new Date(),new Date(),new Date()};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.activity_main);
JSONObject allData=new JSONObject();   //建立最外面的JSONObject
JSONArray array=new JSONArray();     //定义新的JSONArray对象
for (int i = 0; i < namedata.length; i++) {    //For循环添加数据
JSONObject temp=new JSONObject();    //创建一个新的JSONObject对象
try {
temp.put("name", namedata[i]);   //设置要保存的数据,直接子项的子项
temp.put("age", agedata[i]);
temp.put("merried", marrieddata[i]);
temp.put("salary", salarydata[i]);
temp.put("birthday", birthdaydata[i]);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
array.put(temp);
}
try {
allData.put("persondata", array);   //保存所有数据
allData.put("company", this.company);   //最外层数据
allData.put("address", this.address);
allData.put("telephone", this.telephone);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){//判断是否存在SD卡
return ;
}
File file=new File(Environment.getExternalStorageDirectory().toString()
+File.separator+"mldndata"
+File.separator+"json.txt");
if(!file.getParentFile().exists()){//判断父文件是否存在，如果不存在则创建
file.getParentFile().mkdirs();
}
PrintStream out=null;   //打印流
try {
out=new PrintStream(new FileOutputStream(file));  //实例化打印流对象 
out.print(allData.toString());     //输出数据
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
if(out!=null){    //如果打印流不为空，则关闭打印流
out.close();
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}