http请求返回并解析json数据

Java代码  

/*   注意get和post请求的发送区别
 * 1、创建HttpGet(或HttpPost)对象，将要请求的URL通过构造方法传入HttpGet(或HttpPost)对象中；
   2、使用DefaultHttpClient类的execute方法发送HTTP GET或HTTP POST 请求，并返回HttpResponse对象；
   3、通过HttpResponse接口的getEntity方法返回响应信息。
 * */

public class TestHttpActivity extends Activity {
  private Button btn_get;
  private Button btn_post;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btn_get=(Button)findViewById(R.id.btn_get);
        btn_post=(Button)findViewById(R.id.btn_post);
        btn_get.setOnClickListener(listener);
        btn_post.setOnClickListener(listener);
    }
    private OnClickListener listener=new OnClickListener() {

        @Override
        public void onClick(View v) {
            switch (v.getId()) {
            case R.id.btn_post:
                Log.i("TestHttpActivity", "ok");
                 DefaultHttpClient client = new DefaultHttpClient();
                 /**NameValuePair是传送给服务器的请求参数    param.get("name") **/
                 List<NameValuePair> list = new ArrayList<NameValuePair>();
                 NameValuePair pair1 = new BasicNameValuePair("name", "name0001");
                 NameValuePair pair2 = new BasicNameValuePair("age", "age0001");
                 list.add(pair1);
                 list.add(pair2);
                 UrlEncodedFormEntity entity=null;
                try {
                    /**设置编码 **/
                    entity = new UrlEncodedFormEntity(list,"UTF-8");
                } catch (UnsupportedEncodingException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                /**新建一个post请求**/
                 HttpPost post = new HttpPost("http://aaron-pc.wsd.com/Test/testHttp");
                 post.setEntity(entity);
                 HttpResponse response=null;
                 String strResult="";
                try {
                    /**客服端向服务器发送请求**/
                    response = client.execute(post);
                } catch (ClientProtocolException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                   /**请求发送成功，并得到响应**/
                 if(response.getStatusLine().getStatusCode()==200){
                    try {
                          /**读取服务器返回过来的json字符串数据**/
                           strResult = EntityUtils.toString(response.getEntity());
                    } catch (IllegalStateException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }


                     JSONObject jsonObject = null;
                    try {
                        /**把json字符串转换成json对象**/
                        jsonObject = getJSON(strResult);
                    } catch (JSONException e1) {
                        // TODO Auto-generated catch block
                        e1.printStackTrace();
                    }
                     String names="";

                     try {
                         /**
                          * jsonObject.getString("code") 取出code
                          * 比如这里返回的json 字符串为 [code:0,msg:"ok",data:[list:{"name":1},{"name":2}]]
                          * **/

                         /**得到data这个key**/
                         String data=jsonObject.getString("data");
                         /**把data下的数据转换成json对象**/
                         JSONObject jDat = new JSONObject(data);
                         /**判断data对象下的list是否存在**/
                         if(jDat.get("list")!=null){
                             /**把list转换成jsonArray对象**/
                             JSONArray jarr = jDat.getJSONArray("list");
                             /**循环list对象**/
                         for (int i = 0; i < jarr.length(); i++) {

                             /** **/
                             JSONObject jsono = (JSONObject) jarr.get(i);

                             /**取出list下的name的值 **/
                             names=names+jsono.getString("name");

                        }
                         }
                        Toast.makeText(TestHttpActivity.this, "code:"+jsonObject.getString("code")+"name:"+names, Toast.LENGTH_SHORT).show();
                    } catch (JSONException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }


                 }
                 else Toast.makeText(TestHttpActivity.this, "POST提交失败", Toast.LENGTH_SHORT).show();
                break;

            case R.id.btn_get:
                 DefaultHttpClient client1 = new DefaultHttpClient();
                 /**NameValuePair是传送给服务器的请求参数    param.get("name") **/

                 UrlEncodedFormEntity entity1=null;

                /**新建一个get请求**/
                 HttpGet get = new HttpGet("http://aaron-pc.wsd.com/Test/testHttp");
                 HttpResponse response1=null;
                 String strResult1="";
                try {
                    /**客服端向服务器发送请求**/
                    response1 = client1.execute(get);
                } catch (ClientProtocolException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                   /**请求发送成功，并得到响应**/
                 if(response1.getStatusLine().getStatusCode()==200){
                    try {
                          /**读取服务器返回过来的json字符串数据**/
                           strResult1 = EntityUtils.toString(response1.getEntity());
                    } catch (IllegalStateException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }


                     JSONObject jsonObject1 = null;
                    try {
                        /**把json字符串转换成json对象**/
                        jsonObject1 = getJSON(strResult1);
                    } catch (JSONException e1) {
                        // TODO Auto-generated catch block
                        e1.printStackTrace();
                    }
                     String names="";

                     try {
                         /**
                          * jsonObject.getString("code") 取出code
                          * 比如这里返回的json 字符串为 [code:0,msg:"ok",data:[list:{"name":1},{"name":2}]]
                          * **/

                         /**得到data这个key**/
                         String data=jsonObject1.getString("data");
                         /**把data下的数据转换成json对象**/
                         JSONObject jDat1 = new JSONObject(data);
                         /**判断data对象下的list是否存在**/
                         if(jDat1.get("list")!=null){
                             /**把list转换成jsonArray对象**/
                             JSONArray jarr1 = jDat1.getJSONArray("list");
                             /**循环list对象**/
                         for (int i = 0; i < jarr1.length(); i++) {

                             /** **/
                             JSONObject jsono = (JSONObject) jarr1.get(i);

                             /**取出list下的name的值 **/
                             names=names+jsono.getString("name");

                        }
                         }
                        Toast.makeText(TestHttpActivity.this,  "get请求： code:"+jsonObject1.getString("code")+"name:"+names, Toast.LENGTH_SHORT).show();
                    } catch (JSONException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }


                 }
                 else Toast.makeText(TestHttpActivity.this, "get提交失败", Toast.LENGTH_SHORT).show();
                break;
            }

        }
    };
    public JSONObject getJSON(String sb) throws JSONException {
        return new JSONObject(sb);
    }

}

http://284772894.iteye.com/blog/1744114