availableportfinder.html

MINA+API 关于MINA的API

<a name="83" href="#83">83</a>          }
<a name="84" href="#84">84</a>  
<a name="85" href="#85">85</a>          <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = fromPort; i &lt;= MAX_PORT_NUMBER; i++) {
<a name="86" href="#86">86</a>              <strong class="jxr_keyword">if</strong> (available(i)) {
<a name="87" href="#87">87</a>                  <strong class="jxr_keyword">return</strong> i;
<a name="88" href="#88">88</a>              }
<a name="89" href="#89">89</a>          }
<a name="90" href="#90">90</a>  
<a name="91" href="#91">91</a>          <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> NoSuchElementException(<span class="jxr_string">"Could not find an available port "</span>
<a name="92" href="#92">92</a>                  + <span class="jxr_string">"above "</span> + fromPort);
<a name="93" href="#93">93</a>      }
<a name="94" href="#94">94</a>  
<a name="95" href="#95">95</a>      <em class="jxr_javadoccomment">/**</em>
<a name="96" href="#96">96</a>  <em class="jxr_javadoccomment">     * Checks to see if a specific port is available.</em>
<a name="97" href="#97">97</a>  <em class="jxr_javadoccomment">     *</em>
<a name="98" href="#98">98</a>  <em class="jxr_javadoccomment">     * @param port the port to check for availability</em>
<a name="99" href="#99">99</a>  <em class="jxr_javadoccomment">     */</em>
<a name="100" href="#100">100</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">boolean</strong> available(<strong class="jxr_keyword">int</strong> port) {
<a name="101" href="#101">101</a>         <strong class="jxr_keyword">if</strong> (port &lt; MIN_PORT_NUMBER || port &gt; MAX_PORT_NUMBER) {
<a name="102" href="#102">102</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"Invalid start port: "</span> + port);
<a name="103" href="#103">103</a>         }
<a name="104" href="#104">104</a> 
<a name="105" href="#105">105</a>         ServerSocket ss = <strong class="jxr_keyword">null</strong>;
<a name="106" href="#106">106</a>         DatagramSocket ds = <strong class="jxr_keyword">null</strong>;
<a name="107" href="#107">107</a>         <strong class="jxr_keyword">try</strong> {
<a name="108" href="#108">108</a>             ss = <strong class="jxr_keyword">new</strong> ServerSocket(port);
<a name="109" href="#109">109</a>             ss.setReuseAddress(<strong class="jxr_keyword">true</strong>);
<a name="110" href="#110">110</a>             ds = <strong class="jxr_keyword">new</strong> DatagramSocket(port);
<a name="111" href="#111">111</a>             ds.setReuseAddress(<strong class="jxr_keyword">true</strong>);
<a name="112" href="#112">112</a>             <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a name="113" href="#113">113</a>         } <strong class="jxr_keyword">catch</strong> (IOException e) {
<a name="114" href="#114">114</a>         } <strong class="jxr_keyword">finally</strong> {
<a name="115" href="#115">115</a>             <strong class="jxr_keyword">if</strong> (ds != <strong class="jxr_keyword">null</strong>) {
<a name="116" href="#116">116</a>                 ds.close();
<a name="117" href="#117">117</a>             }
<a name="118" href="#118">118</a> 
<a name="119" href="#119">119</a>             <strong class="jxr_keyword">if</strong> (ss != <strong class="jxr_keyword">null</strong>) {
<a name="120" href="#120">120</a>                 <strong class="jxr_keyword">try</strong> {
<a name="121" href="#121">121</a>                     ss.close();
<a name="122" href="#122">122</a>                 } <strong class="jxr_keyword">catch</strong> (IOException e) {
<a name="123" href="#123">123</a>                     <em class="jxr_comment">/*<em class="jxr_comment"> should not be thrown */</em></em>
<a name="124" href="#124">124</a>                 }
<a name="125" href="#125">125</a>             }
<a name="126" href="#126">126</a>         }
<a name="127" href="#127">127</a> 
<a name="128" href="#128">128</a>         <strong class="jxr_keyword">return</strong> false;
<a name="129" href="#129">129</a>     }
<a name="130" href="#130">130</a> 
<a name="131" href="#131">131</a>     <em class="jxr_javadoccomment">/**</em>
<a name="132" href="#132">132</a> <em class="jxr_javadoccomment">     * Returns the {@link Set} of currently avaliable port numbers ({@link Integer})</em>
<a name="133" href="#133">133</a> <em class="jxr_javadoccomment">     * between the specified port range.</em>
<a name="134" href="#134">134</a> <em class="jxr_javadoccomment">     *</em>
<a name="135" href="#135">135</a> <em class="jxr_javadoccomment">     * @throws IllegalArgumentException if port range is not between</em>
<a name="136" href="#136">136</a> <em class="jxr_javadoccomment">     * {@link #MIN_PORT_NUMBER} and {@link #MAX_PORT_NUMBER} or</em>
<a name="137" href="#137">137</a> <em class="jxr_javadoccomment">     * &lt;code&gt;fromPort&lt;/code&gt; if greater than &lt;code&gt;toPort&lt;/code&gt;.</em>
<a name="138" href="#138">138</a> <em class="jxr_javadoccomment">     */</em>
<a name="139" href="#139">139</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> Set&lt;Integer&gt; getAvailablePorts(<strong class="jxr_keyword">int</strong> fromPort, <strong class="jxr_keyword">int</strong> toPort) {
<a name="140" href="#140">140</a>         <strong class="jxr_keyword">if</strong> (fromPort &lt; MIN_PORT_NUMBER || toPort &gt; MAX_PORT_NUMBER
<a name="141" href="#141">141</a>                 || fromPort &gt; toPort) {
<a name="142" href="#142">142</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"Invalid port range: "</span>
<a name="143" href="#143">143</a>                     + fromPort + <span class="jxr_string">" ~ "</span> + toPort);
<a name="144" href="#144">144</a>         }
<a name="145" href="#145">145</a> 
<a name="146" href="#146">146</a>         Set&lt;Integer&gt; result = <strong class="jxr_keyword">new</strong> TreeSet&lt;Integer&gt;();
<a name="147" href="#147">147</a> 
<a name="148" href="#148">148</a>         <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = fromPort; i &lt;= toPort; i++) {
<a name="149" href="#149">149</a>             ServerSocket s = <strong class="jxr_keyword">null</strong>;
<a name="150" href="#150">150</a> 
<a name="151" href="#151">151</a>             <strong class="jxr_keyword">try</strong> {
<a name="152" href="#152">152</a>                 s = <strong class="jxr_keyword">new</strong> ServerSocket(i);
<a name="153" href="#153">153</a>                 result.add(<strong class="jxr_keyword">new</strong> Integer(i));
<a name="154" href="#154">154</a>             } <strong class="jxr_keyword">catch</strong> (IOException e) {
<a name="155" href="#155">155</a>             } <strong class="jxr_keyword">finally</strong> {
<a name="156" href="#156">156</a>                 <strong class="jxr_keyword">if</strong> (s != <strong class="jxr_keyword">null</strong>) {
<a name="157" href="#157">157</a>                     <strong class="jxr_keyword">try</strong> {
<a name="158" href="#158">158</a>                         s.close();
<a name="159" href="#159">159</a>                     } <strong class="jxr_keyword">catch</strong> (IOException e) {
<a name="160" href="#160">160</a>                         <em class="jxr_comment">/*<em class="jxr_comment"> should not be thrown */</em></em>
<a name="161" href="#161">161</a>                     }
<a name="162" href="#162">162</a>                 }
<a name="163" href="#163">163</a>             }
<a name="164" href="#164">164</a>         }
<a name="165" href="#165">165</a> 
<a name="166" href="#166">166</a>         <strong class="jxr_keyword">return</strong> result;
<a name="167" href="#167">167</a>     }
<a name="168" href="#168">168</a> }
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