Android Android使用JSON与服务器交互

  def index() {
        def parg=params
        if(params.data){　　　　　　　　　　//如果存在data参数，将该参数转换为JSONObject　　　　　　　　　　JSONObject json=new JSONObject(params.data)
            def sqlinsert=new Sql(dataSource)　　　　　　　　　　　//从JSONObject中获取数据并插入数据库
            sqlinsert.executeInsert(" INSERT INTO person (name,gender,title) values (?,?,?)", [json.getString("name"),json.getString("gender"),json.getString("title")])
        }
        def sql= new Sql(dataSource)　　　　　　　//获取Person列表，以JSON方式返回
        def rows=sql.rows("select name,gender,title from person")
        sql.close()
        render rows as JSON
    }

 public void doHttpGetJSON(View view) throws IOException, JSONException {
        
        DefaultHttpClient httpClient = new DefaultHttpClient();
        //指定服务器端URL
        HttpGet get = new HttpGet("http://10.4.30.228:8080/PersonForAndroid/person");
        HttpResponse rsp = httpClient.execute(get);
        //获取响应的实体
        HttpEntity httpEntity = rsp.getEntity();
        //将响应的实体转换为字符串
        String jsonString = EntityUtils.toString(httpEntity);
        //服务器端返回的数据格式为：[{"name":"Johnny","gender":"Male","title":"Programmer"},{"name":"Kevin","gender":"Male","title":"Manager"}]
        //是一个JSON数组，因此使用JSONArray将字符串转换为JSONArray
        //如果服务器端返回的是JSON字符串：{"name":"Johnny","gender":"Male","title":"Programmer"}，则使用JSONObject jsonObject=new JSONObject(jsonString)；
        JSONArray jsonArray=new JSONArray(jsonString);
        String resultsString="";
        //遍历JSONArray，将结果输出
        for (int i = 0; i < jsonArray.length(); i++) {
            JSONObject jsonObj = jsonArray.getJSONObject(i);
            String name = jsonObj.getString("name");
            String gender = jsonObj.getString("gender");
            String title = jsonObj.getString("title");
            resultsString += title + " " + name + " is " + gender+"\r\n";
        }
        TextView getTextView = (TextView) findViewById(R.id.jsonGetTextView);
        getTextView.setText(resultsString);
    }

public void doHttpPostJSON(View view) throws IOException, JSONException {
        //定义一个JSON，用于向服务器提交数据
        JSONObject jsonObj = new JSONObject();
        jsonObj.put("name", getTextFromView(R.id.name))
                .put("gender", getTextFromView(R.id.gender))
                .put("title", getTextFromView(R.id.title));
        String jsonString = jsonObj.toString();
        //指定Post参数
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
        nameValuePairs.add(new BasicNameValuePair("data", jsonString));
        
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpPost post = new HttpPost("http://10.4.30.228:8080/PersonForAndroid/person");
        post.setEntity(new UrlEncodedFormEntity(nameValuePairs));
        HttpResponse rsp = httpClient.execute(post);
        
        HttpEntity httpEntity = rsp.getEntity();
        String displayString = EntityUtils.toString(httpEntity);
        
        TextView getTextView = (TextView) findViewById(R.id.jsonPostTextView);
        getTextView.setText(displayString);
    }