Android中JSON数据的读写方法

直接上代码:

package com.iaiai;

import java.util.ArrayList;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONStringer;

import com.xmobileapp.pictureviewer.PictureShow.Folk;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

/**
 * 
 * <p>
 * Title: MainActivity.java
 * </p>
 * <p>
 * E-Mail: [e-mail]
 * </p>
 * <p>
 * QQ: 176291935
 * </p>
 * <p>
 * Http: iaiai.iteye.com
 * </p>
 * <p>
 * Create time: 2011-10-11
 * </p>
 * 
 * @author 丸子
 * @version 0.0.1
 */
public class MainActivity extends Activity {

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		String json = objectToJson();
		Log.i("************json", json);
		try {
			ArrayList<Folk> list = jsonToObject((new JSONObject(json))
					.getJSONArray("object"));
			Log.i("************", list.get(0).getName());
			Log.i("************", list.get(1).getName());
			Log.i("************", list.get(2).getName());
			Log.i("************", list.get(0).getList().get(0).getName());
			Log.i("************", list.get(0).getList().get(0).getList().get(0)
					.getName());
		} catch (JSONException e) {
			e.printStackTrace();
		}
	}

	public ArrayList<Folk> jsonToObject(JSONArray jsonArray) {
		ArrayList<Folk> folks = new ArrayList<Folk>();
		try {
			for (int i = 0; i < jsonArray.length(); i++) {
				JSONObject json = jsonArray.getJSONObject(i);
				Folk folk = new Folk();
				folk.setName(json.optString("name"));
				folk.setAge(json.optString("age"));
				folk.setCareer(json.optString("career"));
				folk.setSalary(json.optInt("salary"));
				folk.setSex(json.optString("sex").equals("male") ? true : false);
				if (json.optString("list") != null
						&& json.optString("list").length() > 0) {
					folk.setList(jsonToObject(new JSONArray(json
							.optString("list"))));
				}
				folks.add(folk);
			}
		} catch (JSONException e) {
			e.printStackTrace();
		}
		return folks;
	}

	public String objectToJson() {
		List<Folk> fsk = new ArrayList<Folk>();
		Folk f2 = new Folk();
		f2.setAge("30岁");
		f2.setName("比尔");
		f2.setSex(false);
		fsk.add(f2);

		List<Folk> fs = new ArrayList<Folk>();
		Folk f1 = new Folk();
		f1.setAge("20岁");
		f1.setName("赵六");
		f1.setSex(true);
		f1.setList(fsk);
		fs.add(f1);

		String jsonData = null;
		List<Folk> folks = new ArrayList<Folk>();
		Folk f = new Folk();
		f.setAge("10岁");
		f.setName("张三");
		f.setSex(true);
		f.setList(fs);
		folks.add(f);
		f = new Folk();
		f.setAge("11岁");
		f.setName("李四");
		f.setSex(false);
		folks.add(f);
		f = new Folk();
		f.setAge("12岁");
		f.setName("王五");
		f.setSex(false);
		folks.add(f);

		try {
			return new JSONStringer().object().key("object")
					.value(objectToJson(folks)).endObject().toString();
		} catch (JSONException e) {
			return null;
		}
	}

	private JSONArray objectToJson(List<Folk> folks) {
		JSONArray array = new JSONArray();
		try {
			StringBuilder builder = new StringBuilder();
			ArrayList<String> folksData = new ArrayList<String>();
			for (int i = 0; i < folks.size(); i++) {
				Folk folk = folks.get(i);
				JSONObject jsonObject = new JSONObject();
				jsonObject.put("name", folk.getName());
				jsonObject.put("sex", folk.isSex() ? "male" : "female");
				jsonObject.put("age", folk.getAge());
				jsonObject.put("career", folk.getCareer());
				jsonObject.put("salary", folk.getSalary());
				if (folk.getList() != null && folk.getList().size() > 0) {
					jsonObject.put("list", objectToJson(folk.getList()));
				}
				folksData.add(jsonObject.toString());
				array.put(jsonObject);
			}
		} catch (JSONException e) {
			e.printStackTrace();
		}
		return array;
	}

	public class Folk {
		String name;
		String career;
		String age;
		int salary;
		boolean sex;

		List<Folk> list;

		public List<Folk> getList() {
			return list;
		}

		public void setList(List<Folk> list) {
			this.list = list;
		}

		public String getName() {
			return name;
		}

		public void setName(String name) {
			this.name = name;
		}

		public String getCareer() {
			return career;
		}

		public void setCareer(String career) {
			this.career = career;
		}

		public String getAge() {
			return age;
		}

		public void setAge(String age) {
			this.age = age;
		}

		public int getSalary() {
			return salary;
		}

		public void setSalary(int salary) {
			this.salary = salary;
		}

		public boolean isSex() {
			return sex;
		}

		public void setSex(boolean sex) {
			this.sex = sex;
		}
	}

}

运行结果: