對於http訪問伺服器獲取json資料，每個專案中都需要用到的，json解析，個人覺得簡單的用jsonobject就可以了，但是遇到介面多的專案，資料量比較大用gson比較方便，減去你很大的負擔。

為自己寫部落格，也是一個好習慣（好記性不如亂筆頭）

下載gson-xx.jar   匯入libs包

首先http get,post訪問伺服器獲取json資料

public static String httpGet(String url) {
		HttpGet httpGet = new HttpGet(url); // 建立一個GET方式的HttpRequest物件
		HttpClient httpClient = new DefaultHttpClient(); // 建立一個預設的HTTP客戶端
		try {
			HttpResponse httpResponse = httpClient.execute(httpGet); // 執行GET方式的HTTP請求
			int reponseCode = httpResponse.getStatusLine().getStatusCode(); // 獲得伺服器的響應碼
			if (reponseCode == HttpStatus.SC_OK) {
				String strResult = EntityUtils.toString(httpResponse
						.getEntity());
				return strResult;
			} else {
				Log.e("httpGet", "GET請求失敗!");
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
 

public static String httpPost(String url) throws Exception {
		// 第1步：建立HttpPost物件
		HttpPost httpPost = new HttpPost(url);
		// 設定HTTP POST請求引數必須用NameValuePair物件
		/*
		 * Post運作傳送變數必須用NameValuePair[]陣列儲存
		 */
		List<NameValuePair> params = new ArrayList<NameValuePair>();
		NameValuePair paramContent = new BasicNameValuePair(
				"combatBo.username", "admin");
		params.add(paramContent);
		// 設定HTTP POST請求引數
		httpPost.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
		// 第2步：使用execute方法傳送HTTP POST請求，並返回HttpResponse物件
		HttpResponse httpResponse = new DefaultHttpClient().execute(httpPost);
		if (httpResponse.getStatusLine().getStatusCode() == 200) {
			// 第3步：使用getEntity方法獲得返回結果
			String result = EntityUtils.toString(httpResponse.getEntity());
			return result;
		} else {
			Log.e("httpPost", "Post請求失敗!");
		}
		return null;
	}
 

JsonUtil.java工具類

package com.weihb.httpclient;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
public class JsonUtil {
	/**
	 * 將Json解析成類物件
	 */
	public static <T> T getPerson(String jsonString, Class<T> cls) {
		T t = null;
		try {
			Gson gson = new Gson();
			t = gson.fromJson(jsonString, cls);

		} catch (Exception e) {
			e.printStackTrace();
		}
		return t;
	}

	public static <T> List<T> getPersons(String jsonString, Class<T> cls) {
		List<T> list = new ArrayList<T>();
		try {
			Gson gson = new Gson();
			list = gson.fromJson(jsonString, new TypeToken<List<T>>() {
			}.getType());

		} catch (Exception e) {
			e.printStackTrace();
		}
		return list;
	}

	public static List<String> getList(String jsonString) {
		List<String> list = new ArrayList<String>();
		try {
			Gson gson = new Gson();
			list = gson.fromJson(jsonString, new TypeToken<List<String>>() {
			}.getType());
		} catch (Exception e) {
			// TODO: handle exception
		}
		return list;

	}
	public static List<Map<String,Object>> listKeyMap(String jsonString){
		List<Map<String,Object>> list=new ArrayList<Map<String,Object>>();
		try {
			Gson gson = new Gson();
			list = gson.fromJson(jsonString, new TypeToken<List<Map<String,Object>>>() {
			}.getType());
		} catch (Exception e) {
			// TODO: handle exception
		}
		return list;
	}
	/**
	 * java物件轉json
	 */
	public static String JavaToJson(Object cls) {
		String str = null;
		try {
			Gson gson = new Gson();
			str = gson.toJson(cls);

		} catch (Exception e) {
			e.printStackTrace();
		}
		return str;		
	}
}
 

按照json的資料結構，把Bean類造好。注意類的巢狀，還有資料型別，實在不行就全用string，這是蠢辦法也是最簡單的辦法

舉個例子：

package com.weihb.httpclient;

import java.io.Serializable;

public class Weather implements Serializable {

	/**
	 * @Fields serialVersionUID :
	 *         {"weatherinfo":{"city":"北京","cityid":"101010100"
	 *         ,"temp1":"22℃","temp2"
	 *         :"9℃","weather":"晴","img1":"d0.gif","img2":"n0.gif","ptime":"11:00"}}
	 */
	private static final long serialVersionUID = -4518932129666918983L;
	private Weatherinfo weatherinfo;

    public Weatherinfo getWeatherinfo() {
        return weatherinfo;
    }

    public void setWeatherinfo(Weatherinfo weatherinfo) {
        this.weatherinfo = weatherinfo;
    }
    public class Weatherinfo implements Serializable{

		/**
		 * @Fields serialVersionUID : 
		 */ 
		private static final long serialVersionUID = 3560815538897448426L;
		private String city;
	    private String cityid;
	    private String temp1;
	    private String temp2;
	    private String weather;
	    private String img1;
	    private String img2;
	    private String ptime;
		public String getCity() {
			return city;
		}
		public void setCity(String city) {
			this.city = city;
		}
		public String getCityid() {
			return cityid;
		}
		public void setCityid(String cityid) {
			this.cityid = cityid;
		}
		public String getTemp1() {
			return temp1;
		}
		public void setTemp1(String temp1) {
			this.temp1 = temp1;
		}
		public String getTemp2() {
			return temp2;
		}
		public void setTemp2(String temp2) {
			this.temp2 = temp2;
		}
		public String getWeather() {
			return weather;
		}
		public void setWeather(String weather) {
			this.weather = weather;
		}
		public String getImg1() {
			return img1;
		}
		public void setImg1(String img1) {
			this.img1 = img1;
		}
		public String getImg2() {
			return img2;
		}
		public void setImg2(String img2) {
			this.img2 = img2;
		}
		public String getPtime() {
			return ptime;
		}
		public void setPtime(String ptime) {
			this.ptime = ptime;
		}
		@Override
		public String toString() {
			return "Weatherinfo [city=" + city + ", cityid=" + cityid
					+ ", temp1=" + temp1 + ", temp2=" + temp2 + ", weather="
					+ weather + ", img1=" + img1 + ", img2=" + img2
					+ ", ptime=" + ptime + "]";
		}
	    
    }
}