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		<title>一步步搭建物联网系统(教你设计物联网系统)</title>
		<meta name="keywords" content="设计物联网系统,物联网系统设计">
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		<h1>一步步搭建物联网系统(教你设计物联网系统)</h1>
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<div id="TOC">
<ul>
<li><a href="#android简单示例"><span class="toc-section-number">1</span> Android简单示例</a><ul>
<li><a href="#调用web-services-get"><span class="toc-section-number">1.1</span> 调用Web Services GET</a><ul>
<li><a href="#创建restclient"><span class="toc-section-number">1.1.1</span> 创建RESTClient</a></li>
</ul></li>
<li><a href="#使用rest-client获取结果"><span class="toc-section-number">1.2</span> 使用REST Client获取结果</a></li>
</ul></li>
</ul>
</div>
<h1 id="android简单示例"><span class="header-section-number">1</span> Android简单示例</h1>
<p>由于在某些嵌入式系统中使用的是Android系统，这里给出一个简单的Android App的示例，具体代码可以从clone自<a href="https://github.com/phodal/iot-android" class="uri">https://github.com/phodal/iot-android</a></p>
<p>代码说明，经过测试的版本有</p>
<ul>
<li>Android 2.3</li>
<li>Android 4.0.4</li>
</ul>
<p>机型有</p>
<ul>
<li>HTC G1 (android 2.3)</li>
<li>Motor xt300 (android 2.3)</li>
<li>Sony ST25I (android 4.0.4)</li>
<li>MI2</li>
</ul>
<p>应该可以在大部分的手机上工作。</p>
<h2 id="调用web-services-get"><span class="header-section-number">1.1</span> 调用Web Services GET</h2>
<p>这里我们参考一篇文章来调用Web Services——<a href="http://lukencode.com/2010/04/27/calling-web-services-in-android-using-httpclient/">Calling Web Services in Android using HttpClient</a></p>
<h3 id="创建restclient"><span class="header-section-number">1.1.1</span> 创建RESTClient</h3>
<p>在这里我们首先会定义四个REST方法GET、POST、PUT、DELETE</p>
<div class="sourceCode"><pre class="sourceCode java"><code class="sourceCode java"><span class="kw">public</span> <span class="dt">void</span> <span class="fu">Execute</span>(RequestMethod method) <span class="kw">throws</span> Exception {
    <span class="kw">switch</span> (method) {
    <span class="kw">case</span> GET: {
        <span class="co">// add parameters</span>
        String combinedParams = <span class="st">&quot;&quot;</span>;
        <span class="kw">if</span> (!params.<span class="fu">isEmpty</span>()) {
            combinedParams += <span class="st">&quot;?&quot;</span>;
            <span class="kw">for</span> (NameValuePair p : params) {
                String paramString = p.<span class="fu">getName</span>() + <span class="st">&quot;=&quot;</span>
                        + URLEncoder.<span class="fu">encode</span>(p.<span class="fu">getValue</span>(), HTTP.<span class="fu">UTF_8</span>);
                <span class="kw">if</span> (combinedParams.<span class="fu">length</span>() &gt; <span class="dv">1</span>) {
                    combinedParams += <span class="st">&quot;&amp;&quot;</span> + paramString;
                } <span class="kw">else</span> {
                    combinedParams += paramString;
                }
            }
        }

        HttpGet request = <span class="kw">new</span> <span class="fu">HttpGet</span>(url + combinedParams);
        request.<span class="fu">addHeader</span>(<span class="st">&quot;Accept-Encoding&quot;</span>, <span class="st">&quot;gzip&quot;</span>);

        <span class="co">// add headers</span>
        <span class="kw">for</span> (NameValuePair h : headers) {
            request.<span class="fu">addHeader</span>(h.<span class="fu">getName</span>(), h.<span class="fu">getValue</span>());
        }

        <span class="fu">executeRequest</span>(request, url);
        <span class="kw">break</span>;
    }
    <span class="kw">case</span> POST: {
        HttpPost request = <span class="kw">new</span> <span class="fu">HttpPost</span>(url);
        request.<span class="fu">addHeader</span>(<span class="st">&quot;Accept-Encoding&quot;</span>, <span class="st">&quot;gzip&quot;</span>);

        <span class="co">// add headers</span>
        <span class="kw">for</span> (NameValuePair h : headers) {
            request.<span class="fu">addHeader</span>(h.<span class="fu">getName</span>(), h.<span class="fu">getValue</span>());
        }
        <span class="kw">if</span> (!data.<span class="fu">equals</span>(<span class="st">&quot;&quot;</span>)) {
            request.<span class="fu">setEntity</span>(<span class="kw">new</span> <span class="fu">StringEntity</span>(data, HTTP.<span class="fu">UTF_8</span>));
        }

        <span class="kw">if</span> (!params.<span class="fu">isEmpty</span>()) {
            request.<span class="fu">setEntity</span>(<span class="kw">new</span> <span class="fu">UrlEncodedFormEntity</span>(params, HTTP.<span class="fu">UTF_8</span>));
        }

        <span class="fu">executeRequest</span>(request, url);
        <span class="kw">break</span>;
    }
    <span class="kw">case</span> PUT: {
        HttpPut request = <span class="kw">new</span> <span class="fu">HttpPut</span>(url);
        request.<span class="fu">addHeader</span>(<span class="st">&quot;Accept-Encoding&quot;</span>, <span class="st">&quot;gzip&quot;</span>);

        <span class="co">// add headers</span>
        <span class="kw">for</span> (NameValuePair h : headers) {
            request.<span class="fu">addHeader</span>(h.<span class="fu">getName</span>(), h.<span class="fu">getValue</span>());
        }
        <span class="kw">if</span> (!data.<span class="fu">equals</span>(<span class="st">&quot;&quot;</span>)) {
            request.<span class="fu">setEntity</span>(<span class="kw">new</span> <span class="fu">StringEntity</span>(data, HTTP.<span class="fu">UTF_8</span>));
        }

        <span class="kw">if</span> (!params.<span class="fu">isEmpty</span>()) {
            request.<span class="fu">setEntity</span>(<span class="kw">new</span> <span class="fu">UrlEncodedFormEntity</span>(params, HTTP.<span class="fu">UTF_8</span>));
        }

        <span class="fu">executeRequest</span>(request, url);
        <span class="kw">break</span>;
    }
    <span class="kw">case</span> DELETE: {
        HttpDelete request = <span class="kw">new</span> <span class="fu">HttpDelete</span>(url);
        request.<span class="fu">addHeader</span>(<span class="st">&quot;Accept-Encoding&quot;</span>, <span class="st">&quot;gzip&quot;</span>);

        <span class="co">// add headers</span>
        <span class="kw">for</span> (NameValuePair h : headers) {
            request.<span class="fu">addHeader</span>(h.<span class="fu">getName</span>(), h.<span class="fu">getValue</span>());
        }

        <span class="fu">executeRequest</span>(request, url);
        <span class="kw">break</span>;
    }
    }
}</code></pre></div>
<p>这四个方法最后都执行executeRequest来获取响应结果。</p>
<div class="sourceCode"><pre class="sourceCode java"><code class="sourceCode java"><span class="kw">protected</span> <span class="dt">void</span> <span class="fu">executeRequest</span>(HttpUriRequest request, String url) {

        HttpParams httpParameters = <span class="kw">new</span> <span class="fu">BasicHttpParams</span>();
        HttpConnectionParams.<span class="fu">setConnectionTimeout</span>(httpParameters,
                timeoutConnection);
        HttpConnectionParams.<span class="fu">setSoTimeout</span>(httpParameters, timeoutSocket);
        
        HttpProtocolParams.<span class="fu">setUseExpectContinue</span>(httpParameters, <span class="kw">false</span>);
        request.<span class="fu">setParams</span>(httpParameters);
        
        <span class="fu">setOauth</span>(request);
        
        DefaultHttpClient client = <span class="kw">new</span> <span class="fu">DefaultHttpClient</span>();

        HttpResponse httpResponse;

        <span class="kw">try</span> {
            httpResponse = client.<span class="fu">execute</span>(request);
            responseCode = httpResponse.<span class="fu">getStatusLine</span>().<span class="fu">getStatusCode</span>();
            message = httpResponse.<span class="fu">getStatusLine</span>().<span class="fu">getReasonPhrase</span>();

            HttpEntity entity = httpResponse.<span class="fu">getEntity</span>();

            <span class="kw">if</span> (entity != <span class="kw">null</span>) {
                InputStream instream = httpResponse.<span class="fu">getEntity</span>().<span class="fu">getContent</span>();
                Header contentEncoding = httpResponse
                        .<span class="fu">getFirstHeader</span>(<span class="st">&quot;Content-Encoding&quot;</span>);

                <span class="kw">if</span> (contentEncoding != <span class="kw">null</span>
                        &amp;&amp; contentEncoding.<span class="fu">getValue</span>().<span class="fu">equalsIgnoreCase</span>(<span class="st">&quot;gzip&quot;</span>)) {
                    instream = <span class="kw">new</span> GZIPInputStream(instream);
                }

                <span class="co">// instream = entity.getContent();</span>
                response = <span class="fu">convertStreamToString</span>(instream);

                <span class="co">// Closing the input stream will trigger connection release</span>
                instream.<span class="fu">close</span>();
            }

        } <span class="kw">catch</span> (ClientProtocolException e) {
            client.<span class="fu">getConnectionManager</span>().<span class="fu">shutdown</span>();
            e.<span class="fu">printStackTrace</span>();
        } <span class="kw">catch</span> (IOException e) {
            client.<span class="fu">getConnectionManager</span>().<span class="fu">shutdown</span>();
            e.<span class="fu">printStackTrace</span>();
        }
    }</code></pre></div>
<p>接着，我们便可以执行getResponse()函数来获取结果。</p>
<h2 id="使用rest-client获取结果"><span class="header-section-number">1.2</span> 使用REST Client获取结果</h2>
<p>使用RESTClient时，便可以用下面的示例</p>
<div class="sourceCode"><pre class="sourceCode java"><code class="sourceCode java">RestClient client = <span class="kw">new</span> <span class="fu">RestClient</span>(tUrl);
<span class="kw">try</span> {
    client.<span class="fu">Execute</span>(RequestMethod.<span class="fu">GET</span>);
    <span class="kw">if</span> (client.<span class="fu">getResponseCode</span>() != <span class="dv">200</span>) {
        <span class="co">//do something</span>
    }
    <span class="co">//JSONArray jArray = new JSONArray(client.getResponse());</span>
} <span class="kw">catch</span> (Exception e) {
    <span class="co">//do something</span>
}</code></pre></div>
<p>而这时，我们只需要对相应的数据进行处理就可以了，如</p>
<div class="sourceCode"><pre class="sourceCode java"><code class="sourceCode java">JSONArray jArray = <span class="kw">new</span> <span class="fu">JSONArray</span>(client.<span class="fu">getResponse</span>());
JSONObject jObj=jArray.<span class="fu">getJSONObject</span>(<span class="dv">0</span>);
vshow.<span class="fu">setText</span>(jObj.<span class="fu">toString</span>());

<span class="fu">outputJSON</span>(jObj);</code></pre></div>
<p>将他转换为String，接着在Android端上显示最后的结果。</p>
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