Andorid三种解析Json详解

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可以使用普通的json解析方法即JsonObject和JsonArray的配合使用，这对于解析小数据的json数据还是比较实用，但是当解析json数据比较复杂的时候使用Gosn比较好，如果大家感兴趣的话网上有大量的实例可以到网上去看看。

首先客户端也要导入gson的两个jar包，json的jar就不需要导入了（因为android项目中已经集成了json的jar包所以这里无需导入）

用到JsonObject和JsonArray区别

区别在于JSONObject是一个{}包裹起来的一个对象(Object)，而JSONArray则是[]包裹起来的一个数组(Array)，知道这点区别，相信在您以后应用Struts-json的时候，一定不会出现前台得到的数据不能显示这样的问题了，因为通常这样的问题都是因为json数据格式不正确引起的

第一种

1.工具类HttpUtil

public static AsyncHttpClient client=new AsyncHttpClient();

static{

//设置连接超时时间

client.setTimeOut(30000);

}

public static void post(String url,RequestParams params,JsonHttpResponseHandler responseHandler){

client.post(getAbsoluteUrl(url),params,responseHandler);

}

2.MainActivity类

private JSONArray jsonObj;
private List<FindContact> fc;
private List<FindContact> fc2;
JSONObject postData = new JSONObject();
RequestParams para=new RequestParams();//来获取参数是一种比较有效的途径
postData.put("pageNo",pageNo);
para.put("postData",postData.toString());
HttpUtil.post(String url,RequestParams params,responseHandler，new JsonHttpResponseHandler(){

public void onSuccess(int arg0,JSONObject arg1){

if(arg1.get("arg1.get("Status").toString().equals("0")")){
jsonObj=arg1.getJSONArray("postData");//通过arg1对象的getJSONArray()方法将接口数据转换为数组的形式，返回一个jsonArray对象
//解析实体类
fc2=JSON.parseArray(jsonObj.toString(),FindContact.class);
//此处为什么要用for循环来将fc2中的数据放入fc中？
//因为fc2中的数据时从接口的实体类返回过来的
for(int i=0;i<fc2.size(),i++){
fc.add(fc2.get(i));
将fc中的数据塞进适配器中....

}
}
}
}
){
};

第二种

1.工具类同上

2.MainActivity类

private ArrayList<TaskEntity> mList = new ArrayList<TaskEntity>();
mList.clear();
final ArrayList<TaskEntity> tmpArray=new ArrayList<TaskEntity>();
String urlString=ApiConstant.URL+ApiConstant.findTasks;
RequestParams params=new RequestParams();//绑定参数
params.put("memberId",userId);
HttpUtil.get(urlString,params,new JsonHttpResponseHandler(){
public void onSuccess(JSONObject jObj){//获取数据成功会调用
JSONArray jsonArray=jObj.getJSONArray("Data");//将接口数据转化为数组
//此处for循环难道是要将数据塞进实体类中
for(int i=0;i<jsonArray.length();i++){
TaskEntity task=new TaskEntity();
JSONObject jsonObj=(JSONObject)jsonArray.opt(i);
if(jsonObject.getString("type").equals("0")&&!jsonObject.getString("id").equals("6f169b686bb44af880d0af37b65de821")){
task.setMessage(jsonObject.getString);
task.setDone(jsonObject.getBoolean("finished"));
task.setPoint(jsonObject.getString("point"));
task.setDescription(jsonObject.getString("description");
tmpArray.add(task);//将从接口的实体类中的数据塞进tmpArray集合中
}
}
if(tmpArray!=null){
for(TaskEntity tt:tmpArray){//for循环遍历tmpArray
mList.add(tt);//将数据塞进mList集合中
}
}

}

});

第三种，使用Gson,解析复杂的形式

如：

{
    "error": 0,
    "status": "success",
    "date": "2014-05-10",
    "results": [
        {
            "currentCity": "南京",
            "weather_data": [
                {
                    "date": "周六(今天, 实时：19℃)",
                    "dayPictureUrl": "http://api.map.baidu.com/images/weather/day/dayu.png",
                    "nightPictureUrl": "http://api.map.baidu.com/images/weather/night/dayu.png",
                    "weather": "大雨",
                    "wind": "东南风5-6级",
                    "temperature": "18℃"
                },
                {
                    "date": "周日",
                    "dayPictureUrl": "http://api.map.baidu.com/images/weather/day/zhenyu.png",
                    "nightPictureUrl": "http://api.map.baidu.com/images/weather/night/duoyun.png",
                    "weather": "阵雨转多云",
                    "wind": "西北风4-5级",
                    "temperature": "21 ~ 14℃"
                }
            ]
        }
    ]
1.定义如下一些的javaBean数据

Status.java

private String error;
private String status;
private String date;
private List<Results> results;
public String getError()
{
return error;
}
public void setError(String error)
{
this.error = error;
}
public String getStatus()
{
return status;
}
public void setStatus(String status)
{
this.status = status;
}
public String getDate()
{
return date;
}
public void setDate(String date)
{
this.date = date;
}
public List<Results> getResults()
{
return results;
}
public void setResults(List<Results> results)
{
this.results = results;
}
@Override
public String toString()
{
return "Status [error=" + error + ", status=" + status
+ ", date=" + date + ", results=" + results + "]";
}

private String error;
private String status;
private String date;
private List<Results> results;
public String getError()
{
return error;
}
public void setError(String error)
{
this.error = error;
}
public String getStatus()
{
return status;
}
public void setStatus(String status)
{
this.status = status;
}
public String getDate()
{
return date;
}
public void setDate(String date)
{
this.date = date;
}
public List<Results> getResults()
{
return results;
}
public void setResults(List<Results> results)
{
this.results = results;
}
@Override
public String toString()
{
return "Status [error=" + error + ", status=" + status
+ ", date=" + date + ", results=" + results + "]";
}

Results.java

public class Results
{
private String currentCity;
private List<Weather> weather_data;
public String getCurrentCity()
{
return currentCity;
}
public void setCurrentCity(String currentCity)
{
this.currentCity = currentCity;
}
public List<Weather> getWeather_data()
{
return weather_data;
}
public void setWeather_data(List<Weather> weather_data)
{
this.weather_data = weather_data;
}
@Override
public String toString()
{
return "Results [currentCity=" + currentCity + ", weather_data="
+ weather_data + "]";
}

Weather.java

public class Weather {
private String date;
private String dayPictureUrl;
private String nightPictureUrl;
private String weather;
private String wind;
private String temperature;
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
public String getDayPictureUrl() {
return dayPictureUrl;
}
public void setDayPictureUrl(String dayPictureUrl) {
this.dayPictureUrl = dayPictureUrl;
}
public String getNightPictureUrl() {
return nightPictureUrl;
}
public void setNightPictureUrl(String nightPictureUrl) {
this.nightPictureUrl = nightPictureUrl;
}
public String getWeather() {
return weather;
}
public void setWeather(String weather) {
this.weather = weather;
}
public String getWind() {
return wind;
}
public void setWind(String wind) {
this.wind = wind;
}
public String getTemperature() {
return temperature;
}
public void setTemperature(String temperature) {
this.temperature = temperature;
}
@Override
public String toString() {
return "Weather [date=" + date + ", dayPictureUrl="
+ dayPictureUrl + ", nightPictureUrl="
+ nightPictureUrl + ", weather=" + weather
+ ", wind=" + wind + ", temperature=" + temperature
+ "]";
}

然后具体的javabean定义好了就将解析数据了，下面就是我的解析数据类

[java] view plaincopy
public class MainActivity extends Activity   
{  
    private Button tojson;    
    RequestQueue mQueue;      
    StringRequest stringRequest;      
    Gson gson;  
    String str;  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState)   
    {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
          
        tojson = (Button)findViewById(R.id.tojson);  
        gson = new Gson();  
  
    mQueue = Volley.newRequestQueue(MainActivity.this);   
         //http://10.19.20.12/upgrade/test.txt是测试使用的json数据  
        stringRequest = new StringRequest("http://10.19.20.12/upgrade/test.txt",  
                new Response.Listener<String>()   
                {  
                    @Override  
                    public void onResponse(String response)   
                    {  
                        Log.d("TAG", response);  
                        System.out.println("response="+response);  
                        Status status = gson.fromJson(response, Status.class);  
                        System.out.println("status="+status);  
                        System.out.println("-------------------------------------");  
                        List<Results> result = status.getResults();  
                        System.out.println("result="+result);  
                          
                    }  
                },   
                new Response.ErrorListener()   
                {  
                    @Override  
                    public void onErrorResponse(VolleyError error)   
                    {  
                        Log.e("TAG", error.getMessage(), error);  
                    }  
  
                });  
    
        tojson.setOnClickListener(new OnClickListener()   
        {         
            @Override  
            public void onClick(View v)   
            {  
                mQueue.add(stringRequest);  
            }  
        });       
    }  
  
      
   
}

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