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doc-exports/docs/sfs/api-ref/sfs_02_0109.html
lizaoxu b47ac2cabb SFS API Version 
Reviewed-by: Muller, Martin <martin.muller@t-systems.com>
Co-authored-by: lizaoxu <lizaoxu@huawei.com>
Co-committed-by: lizaoxu <lizaoxu@huawei.com>
2026-01-08 08:01:31 +00:00

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<a name="sfs_02_0109"></a><a name="sfs_02_0109"></a>
<h1 class="topictitle1">Listing File Systems</h1>
<div id="body0000001338755302"><div class="section" id="sfs_02_0109__en-us_topic_0000001263548562_section126181353433"><h4 class="sectiontitle">Scenarios</h4><p id="sfs_02_0109__en-us_topic_0000001263548562_p6502175517437">If you want to view information about all file systems created by yourself, you can call the API for listing file systems.</p>
<p id="sfs_02_0109__en-us_topic_0000001263548562_p59641857134311">The following describes how to call the API for <a href="sfs_02_0114.html">Listing File Systems</a>. For details, see <a href="sfs_02_0107.html">Getting Started (General Purpose File System)</a>.</p>
</div>
<div class="section" id="sfs_02_0109__en-us_topic_0000001263548562_section144871505442"><h4 class="sectiontitle">Prerequisites</h4><ul id="sfs_02_0109__en-us_topic_0000001263548562_ul99703598558"><li id="sfs_02_0109__en-us_topic_0000001263548562_li1297135913557">You have obtained the AK and SK. For details, see <a href="sfs_02_0120.html">Obtaining Access Keys (AK/SK)</a>.</li><li id="sfs_02_0109__en-us_topic_0000001263548562_li1649028135612">You have specified the region where you want to list file systems and obtained the endpoint required for API calls. For details, see <a href="https://docs.otc.t-systems.com/regions-and-endpoints/index.html" target="_blank" rel="noopener noreferrer">Regions and Endpoints</a>.</li></ul>
</div>
<div class="section" id="sfs_02_0109__en-us_topic_0000001263548562_section17666184734517"><h4 class="sectiontitle">Listing File Systems in the a1 Region</h4><p id="sfs_02_0109__en-us_topic_0000001263548562_p10675161454618">In this example, an Apache HttpClient is used.</p>
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<span class="normal">97</span></pre></div></td><td class="code"><div><pre><span></span><span class="kn">package</span><span class="w"> </span><span class="nn">com.sfsclient</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.io.*</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.net.HttpURLConnection</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.net.URL</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.util.List</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.util.Map</span><span class="p">;</span>
<span class="kd">public</span><span class="w"> </span><span class="kd">class</span> <span class="nc">TestMain</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="c1">//Obtain an AK/SK pair using environment variables or import the AK/SK pair in other ways. Using hard coding may result in leakage.</span>
<span class="w"> </span><span class="c1">//Obtain an AK/SK pair on the management console.</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">accessKey</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">System</span><span class="p">.</span><span class="na">getenv</span><span class="p">(</span><span class="s">&quot;YOUR_SDK_AK&quot;</span><span class="p">);</span><span class="w"> </span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">securityKey</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">System</span><span class="p">.</span><span class="na">getenv</span><span class="p">(</span><span class="s">&quot;YOUR_SDK_SK&quot;</span><span class="p">);</span><span class="w"> </span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">endpoint</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;sfs3.a1.region.com&quot;</span><span class="p">;</span><span class="w"> </span><span class="c1">// The access address of General Purpose File System</span>
<span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="kd">static</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">main</span><span class="p">(</span><span class="n">String</span><span class="o">[]</span><span class="w"> </span><span class="n">str</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">createFileSystem</span><span class="p">();</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="kd">private</span><span class="w"> </span><span class="kd">static</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">listFileSystem</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">httpMethod</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;GET&quot;</span><span class="p">;</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">date</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">DateUtils</span><span class="p">.</span><span class="na">formatDate</span><span class="p">(</span><span class="n">System</span><span class="p">.</span><span class="na">currentTimeMillis</span><span class="p">());</span>
<span class="w"> </span><span class="cm">/**Calculate the signature based on the request.**/</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">contentMD5</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;&quot;</span><span class="p">;</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">contentType</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;&quot;</span><span class="p">;</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">canonicalizedHeaders</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;x-obs-bucket-type:SFS&quot;</span><span class="p">;</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">canonicalizedResource</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">&quot;/&quot;</span><span class="w"> </span><span class="p">;</span>
<span class="w"> </span><span class="c1">// Content-MD5 and Content-Type fields do not contain line breaks. The data format is RFC 1123, which is the same as the time in the request.</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">stringToSign</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">httpMethod</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="s">&quot;\n&quot;</span><span class="w"> </span><span class="o">+</span>
<span class="w"> </span><span class="n">contentMD5</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="s">&quot;\n&quot;</span><span class="w"> </span><span class="o">+</span>
<span class="w"> </span><span class="n">contentType</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="s">&quot;\n&quot;</span><span class="w"> </span><span class="o">+</span>
<span class="w"> </span><span class="n">date</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="s">&quot;\n&quot;</span><span class="w"> </span><span class="o">+</span>
<span class="w"> </span><span class="n">canonicalizedHeaders</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="s">&quot;\n&quot;</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">canonicalizedResource</span><span class="p">;</span>
<span class="w"> </span><span class="n">System</span><span class="p">.</span><span class="na">out</span><span class="p">.</span><span class="na">printf</span><span class="p">(</span><span class="s">&quot;StringToSign:\n[%s]\n\n&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">stringToSign</span><span class="p">);</span>
<span class="w"> </span><span class="n">HttpURLConnection</span><span class="w"> </span><span class="n">conn</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="kc">null</span><span class="p">;</span>
<span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">signature</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Signature</span><span class="p">.</span><span class="na">signWithHmacSha1</span><span class="p">(</span><span class="n">securityKey</span><span class="p">,</span><span class="w"> </span><span class="n">stringToSign</span><span class="p">);</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">authorization</span><span class="o">=</span><span class="w"> </span><span class="s">&quot;OBS &quot;</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">accessKey</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="s">&quot;:&quot;</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">signature</span><span class="p">;</span>
<span class="w"> </span><span class="n">System</span><span class="p">.</span><span class="na">out</span><span class="p">.</span><span class="na">printf</span><span class="p">(</span><span class="s">&quot;authorization:%s\n\n&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">authorization</span><span class="p">);</span>
<span class="w"> </span><span class="c1">// Create an HTTP request.</span>
<span class="w"> </span><span class="n">URL</span><span class="w"> </span><span class="n">url</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">URL</span><span class="p">(</span><span class="s">&quot;http://&quot;</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">endpoint</span><span class="p">);</span>
<span class="w"> </span><span class="n">conn</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">(</span><span class="n">HttpURLConnection</span><span class="p">)</span><span class="w"> </span><span class="n">url</span><span class="p">.</span><span class="na">openConnection</span><span class="p">();</span>
<span class="w"> </span><span class="c1">// Add a signature header.</span>
<span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="na">setRequestMethod</span><span class="p">(</span><span class="n">httpMethod</span><span class="p">);</span>
<span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="na">setRequestProperty</span><span class="p">(</span><span class="s">&quot;Date&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">date</span><span class="p">);</span>
<span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="na">setRequestProperty</span><span class="p">(</span><span class="s">&quot;Content-Type&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">contentType</span><span class="p">);</span>
<span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="na">setRequestProperty</span><span class="p">(</span><span class="s">&quot;x-obs-bucket-type&quot;</span><span class="p">,</span><span class="w"> </span><span class="s">&quot;SFS&quot;</span><span class="p">);</span>
<span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="na">setRequestProperty</span><span class="p">(</span><span class="s">&quot;Authorization&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">authorization</span><span class="p">);</span>
<span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="na">setDoOutput</span><span class="p">(</span><span class="kc">true</span><span class="p">);</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">status</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="na">getHeaderField</span><span class="p">(</span><span class="kc">null</span><span class="p">);</span>
<span class="w"> </span><span class="n">System</span><span class="p">.</span><span class="na">out</span><span class="p">.</span><span class="na">println</span><span class="p">(</span><span class="n">status</span><span class="p">);</span>
<span class="w"> </span><span class="c1">// Output the response message.</span>
<span class="w"> </span><span class="n">Map</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">List</span><span class="o">&lt;</span><span class="n">String</span><span class="o">&gt;&gt;</span><span class="w"> </span><span class="n">headers</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="na">getHeaderFields</span><span class="p">();</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n">Map</span><span class="p">.</span><span class="na">Entry</span><span class="o">&lt;</span><span class="n">String</span><span class="p">,</span><span class="w"> </span><span class="n">List</span><span class="o">&lt;</span><span class="n">String</span><span class="o">&gt;&gt;</span><span class="w"> </span><span class="n">entry</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">headers</span><span class="p">.</span><span class="na">entrySet</span><span class="p">())</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">key</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">entry</span><span class="p">.</span><span class="na">getKey</span><span class="p">();</span>
<span class="w"> </span><span class="n">List</span><span class="o">&lt;</span><span class="n">String</span><span class="o">&gt;</span><span class="w"> </span><span class="n">values</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">entry</span><span class="p">.</span><span class="na">getValue</span><span class="p">();</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">key</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="kc">null</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">value</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">values</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">System</span><span class="p">.</span><span class="na">out</span><span class="p">.</span><span class="na">println</span><span class="p">(</span><span class="n">key</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="s">&quot;: &quot;</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">value</span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="c1">// Process the returned content.</span>
<span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">statusCode</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="na">getResponseCode</span><span class="p">();</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">statusCode</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">HttpURLConnection</span><span class="p">.</span><span class="na">HTTP_OK</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">InputStream</span><span class="w"> </span><span class="n">responseStream</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="na">getInputStream</span><span class="p">();</span>
<span class="w"> </span><span class="n">BufferedReader</span><span class="w"> </span><span class="n">reader</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">BufferedReader</span><span class="p">(</span><span class="k">new</span><span class="w"> </span><span class="n">InputStreamReader</span><span class="p">(</span><span class="n">responseStream</span><span class="p">));</span>
<span class="w"> </span><span class="n">StringBuilder</span><span class="w"> </span><span class="n">responseBody</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">StringBuilder</span><span class="p">();</span>
<span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">line</span><span class="p">;</span>
<span class="w"> </span><span class="k">while</span><span class="w"> </span><span class="p">((</span><span class="n">line</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">reader</span><span class="p">.</span><span class="na">readLine</span><span class="p">())</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="kc">null</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">responseBody</span><span class="p">.</span><span class="na">append</span><span class="p">(</span><span class="n">line</span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="n">reader</span><span class="p">.</span><span class="na">close</span><span class="p">();</span>
<span class="w"> </span><span class="n">System</span><span class="p">.</span><span class="na">out</span><span class="p">.</span><span class="na">println</span><span class="p">(</span><span class="s">&quot;responseBody: &quot;</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">responseBody</span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="k">else</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">System</span><span class="p">.</span><span class="na">out</span><span class="p">.</span><span class="na">println</span><span class="p">(</span><span class="s">&quot;Error: &quot;</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">statusCode</span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="k">catch</span><span class="w"> </span><span class="p">(</span><span class="n">IOException</span><span class="w"> </span><span class="n">e</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">e</span><span class="p">.</span><span class="na">printStackTrace</span><span class="p">();</span>
<span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="k">finally</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">conn</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="kc">null</span><span class="p">){</span>
<span class="w"> </span><span class="n">conn</span><span class="p">.</span><span class="na">disconnect</span><span class="p">();</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
</pre></div></td></tr></table></div>
</div>
<p id="sfs_02_0109__en-us_topic_0000001263548562_p529616208248"></p>
<p id="sfs_02_0109__en-us_topic_0000001263548562_p224061622114">The format of the <strong id="sfs_02_0109__en-us_topic_0000001263548562_b13182189264">Date</strong> header field <strong id="sfs_02_0109__en-us_topic_0000001263548562_b1090619122261">DateUtils</strong> is as follows:</p>
<div class="codecoloring" codetype="Java" id="sfs_02_0109__en-us_topic_0000001263548562_screen56562831219"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
<span class="normal"> 2</span>
<span class="normal"> 3</span>
<span class="normal"> 4</span>
<span class="normal"> 5</span>
<span class="normal"> 6</span>
<span class="normal"> 7</span>
<span class="normal"> 8</span>
<span class="normal"> 9</span>
<span class="normal">10</span>
<span class="normal">11</span>
<span class="normal">12</span>
<span class="normal">13</span>
<span class="normal">14</span>
<span class="normal">15</span>
<span class="normal">16</span></pre></div></td><td class="code"><div><pre><span></span><span class="kn">package</span><span class="w"> </span><span class="nn">com.sfsclient</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.text.DateFormat</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.text.SimpleDateFormat</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.util.Locale</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.util.TimeZone</span><span class="p">;</span>
<span class="kd">public</span><span class="w"> </span><span class="kd">class</span> <span class="nc">DateUtils</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="kd">static</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="nf">formatDate</span><span class="p">(</span><span class="kt">long</span><span class="w"> </span><span class="n">time</span><span class="p">)</span>
<span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">DateFormat</span><span class="w"> </span><span class="n">serverDateFormat</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">SimpleDateFormat</span><span class="p">(</span><span class="s">&quot;EEE, dd MMM yyyy HH:mm:ss z&quot;</span><span class="p">,</span><span class="w"> </span><span class="n">Locale</span><span class="p">.</span><span class="na">ENGLISH</span><span class="p">);</span>
<span class="w"> </span><span class="n">serverDateFormat</span><span class="p">.</span><span class="na">setTimeZone</span><span class="p">(</span><span class="n">TimeZone</span><span class="p">.</span><span class="na">getTimeZone</span><span class="p">(</span><span class="s">&quot;GMT&quot;</span><span class="p">));</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">serverDateFormat</span><span class="p">.</span><span class="na">format</span><span class="p">(</span><span class="n">time</span><span class="p">);</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
</pre></div></td></tr></table></div>
</div>
<p id="sfs_02_0109__en-us_topic_0000001263548562_p1984165715225"></p>
<p id="sfs_02_0109__en-us_topic_0000001263548562_p9369844231">The method of calculating the signature character string is as follows:</p>
<div class="codecoloring" codetype="Java" id="sfs_02_0109__en-us_topic_0000001263548562_screen2693143313131"><div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
<span class="normal"> 2</span>
<span class="normal"> 3</span>
<span class="normal"> 4</span>
<span class="normal"> 5</span>
<span class="normal"> 6</span>
<span class="normal"> 7</span>
<span class="normal"> 8</span>
<span class="normal"> 9</span>
<span class="normal">10</span>
<span class="normal">11</span>
<span class="normal">12</span>
<span class="normal">13</span>
<span class="normal">14</span>
<span class="normal">15</span>
<span class="normal">16</span>
<span class="normal">17</span>
<span class="normal">18</span>
<span class="normal">19</span>
<span class="normal">20</span>
<span class="normal">21</span>
<span class="normal">22</span>
<span class="normal">23</span></pre></div></td><td class="code"><div><pre><span></span><span class="kn">package</span><span class="w"> </span><span class="nn">com.sfsclient</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">javax.crypto.Mac</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">javax.crypto.spec.SecretKeySpec</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.io.UnsupportedEncodingException</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.security.NoSuchAlgorithmException</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.security.InvalidKeyException</span><span class="p">;</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">java.util.Base64</span><span class="p">;</span>
<span class="kd">public</span><span class="w"> </span><span class="kd">class</span> <span class="nc">Signature</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="kd">static</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="nf">signWithHmacSha1</span><span class="p">(</span><span class="n">String</span><span class="w"> </span><span class="n">sk</span><span class="p">,</span><span class="w"> </span><span class="n">String</span><span class="w"> </span><span class="n">canonicalString</span><span class="p">)</span><span class="w"> </span><span class="kd">throws</span><span class="w"> </span><span class="n">UnsupportedEncodingException</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="k">try</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">SecretKeySpec</span><span class="w"> </span><span class="n">signingKey</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">SecretKeySpec</span><span class="p">(</span><span class="n">sk</span><span class="p">.</span><span class="na">getBytes</span><span class="p">(</span><span class="s">&quot;UTF-8&quot;</span><span class="p">),</span><span class="w"> </span><span class="s">&quot;HmacSHA1&quot;</span><span class="p">);</span>
<span class="w"> </span><span class="n">Mac</span><span class="w"> </span><span class="n">mac</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">Mac</span><span class="p">.</span><span class="na">getInstance</span><span class="p">(</span><span class="s">&quot;HmacSHA1&quot;</span><span class="p">);</span>
<span class="w"> </span><span class="n">mac</span><span class="p">.</span><span class="na">init</span><span class="p">(</span><span class="n">signingKey</span><span class="p">);</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">Base64</span><span class="p">.</span><span class="na">getEncoder</span><span class="p">().</span><span class="na">encodeToString</span><span class="p">(</span><span class="n">mac</span><span class="p">.</span><span class="na">doFinal</span><span class="p">(</span><span class="n">canonicalString</span><span class="p">.</span><span class="na">getBytes</span><span class="p">(</span><span class="s">&quot;UTF-8&quot;</span><span class="p">)));</span>
<span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="k">catch</span><span class="w"> </span><span class="p">(</span><span class="n">NoSuchAlgorithmException</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">InvalidKeyException</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">UnsupportedEncodingException</span><span class="w"> </span><span class="n">e</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">e</span><span class="p">.</span><span class="na">printStackTrace</span><span class="p">();</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="kc">null</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
</pre></div></td></tr></table></div>
</div>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="sfs_02_0107.html">Getting Started (General Purpose File System)</a></div>
</div>
</div>
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