android json和httpget的使用

public class JsonActivity extends Activity { 
    /** Called when the activity is first created. */ 
    private TextView tvJson; 
    private Button btnJson; 
    private Button btnJsonMulti; 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.main); 
        tvJson = (TextView) this.findViewById(R.id.tvJson); 
        btnJson = (Button) this.findViewById(R.id.btnJson); 
        btnJsonMulti = (Button) this.findViewById(R.id.btnJsonMulti); 
        btnJson.setOnClickListener(new View.OnClickListener() { 
            @Override 
            public void onClick(View v) { 
                // url 
                // String strUrl = "http://10.158.166.110:8080/AndroidServer/JsonServlet"; 
                String strUrl = ServerPageUtil.getStrUrl(UrlsOfServer.JSON_SINGER); 
                //获得返回的Json字符串 
                String strResult = connServerForResult(strUrl); 
                //解析Json字符串 
                parseJson(strResult); 
            } 
        }); 
        btnJsonMulti.setOnClickListener(new View.OnClickListener() { 
            @Override 
            public void onClick(View v) { 
                String strUrl = ServerPageUtil.getStrUrl(UrlsOfServer.JSON_SINGERS); 
                String strResult = connServerForResult(strUrl); 
                //获得多个Singer 
                parseJsonMulti(strResult); 
            } 
        }); 
    } 
    private String connServerForResult(String strUrl) { 
        // HttpGet对象 
        HttpGet httpRequest = new HttpGet(strUrl); 
        String strResult = ""; 
        try { 
            // HttpClient对象 
            HttpClient httpClient = new DefaultHttpClient(); 
            // 获得HttpResponse对象 
            HttpResponse httpResponse = httpClient.execute(httpRequest); 
            if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) { 
                // 取得返回的数据 
                strResult = EntityUtils.toString(httpResponse.getEntity()); 
            } 
        } catch (ClientProtocolException e) { 
            tvJson.setText("protocol error"); 
            e.printStackTrace(); 
        } catch (IOException e) { 
            tvJson.setText("IO error"); 
            e.printStackTrace(); 
        } 
        return strResult; 
    } 
    // 普通Json数据解析 
    private void parseJson(String strResult) { 
        try { 
            JSONObject jsonObj = new JSONObject(strResult).getJSONObject("singer"); 
            int id = jsonObj.getInt("id"); 
            String name = jsonObj.getString("name"); 
            String gender = jsonObj.getString("gender"); 
            tvJson.setText("ID号"+id + ", 姓名：" + name + ",性别：" + gender); 
        } catch (JSONException e) { 
            System.out.println("Json parse error"); 
            e.printStackTrace(); 
        } 
    } 
    //解析多个数据的Json
    private void parseJsonMulti(String strResult) { 
        try { 
            JSONArray jsonObjs = new JSONObject(strResult).getJSONArray("singers"); 
            String s = ""; 
            for(int i = 0; i < jsonObjs.length() ; i++){ 
                JSONObject jsonObj = ((JSONObject)jsonObjs.opt(i)) 
                .getJSONObject("singer"); 
                int id = jsonObj.getInt("id"); 
                String name = jsonObj.getString("name"); 
                String gender = jsonObj.getString("gender"); 
                s +=  "ID号"+id + ", 姓名：" + name + ",性别：" + gender+ "\n" ; 
            } 
            tvJson.setText(s); 
        } catch (JSONException e) { 
            System.out.println("Jsons parse error !"); 
            e.printStackTrace(); 
        } 
    } 
}