ioutils.html

用JAVA编写的,在做实验的时候留下来的,本来想删的,但是传上来,大家分享吧

<a name="99" href="#99">99</a>      <em>/**<em>*</em></em>
<a name="100" href="#100">100</a> <em>     * Ensure writeable directory.</em>
<a name="101" href="#101">101</a> <em>     *</em>
<a name="102" href="#102">102</a> <em>     * If doesn't exist, we attempt creation.</em>
<a name="103" href="#103">103</a> <em>     *</em>
<a name="104" href="#104">104</a> <em>     * @param dir Directory to test for exitence and is writeable.</em>
<a name="105" href="#105">105</a> <em>     *</em>
<a name="106" href="#106">106</a> <em>     * @return The passed &lt;code>dir&lt;/code>.</em>
<a name="107" href="#107">107</a> <em>     *</em>
<a name="108" href="#108">108</a> <em>     * @exception IOException If passed directory does not exist and is not</em>
<a name="109" href="#109">109</a> <em>     * createable, or directory is not writeable or is not a directory.</em>
<a name="110" href="#110">110</a> <em>     */</em>
<a name="111" href="#111">111</a>     <strong>public</strong> <strong>static</strong> File ensureWriteableDirectory(File dir)
<a name="112" href="#112">112</a>     throws IOException {
<a name="113" href="#113">113</a>         <strong>if</strong> (!dir.exists()) {
<a name="114" href="#114">114</a>             dir.mkdirs();
<a name="115" href="#115">115</a>         } <strong>else</strong> {
<a name="116" href="#116">116</a>             <strong>if</strong> (!dir.canWrite()) {
<a name="117" href="#117">117</a>                 <strong>throw</strong> <strong>new</strong> IOException(<span class="string">"Dir "</span> + dir.getAbsolutePath() +
<a name="118" href="#118">118</a>                     <span class="string">" not writeable."</span>);
<a name="119" href="#119">119</a>             } <strong>else</strong> <strong>if</strong> (!dir.isDirectory()) {
<a name="120" href="#120">120</a>                 <strong>throw</strong> <strong>new</strong> IOException(<span class="string">"Dir "</span> + dir.getAbsolutePath() +
<a name="121" href="#121">121</a>                     <span class="string">" is not a directory."</span>);
<a name="122" href="#122">122</a>             }
<a name="123" href="#123">123</a>         }
<a name="124" href="#124">124</a> 
<a name="125" href="#125">125</a>         <strong>return</strong> dir;
<a name="126" href="#126">126</a>     }
<a name="127" href="#127">127</a> 
<a name="128" href="#128">128</a>     <em>/**<em>*</em></em>
<a name="129" href="#129">129</a> <em>     * Read the entire stream to EOF, returning what's read as a String.</em>
<a name="130" href="#130">130</a> <em>     * </em>
<a name="131" href="#131">131</a> <em>     * @param inputStream</em>
<a name="132" href="#132">132</a> <em>     * @return String of the whole inputStream's contents</em>
<a name="133" href="#133">133</a> <em>     * @throws IOException</em>
<a name="134" href="#134">134</a> <em>     */</em>
<a name="135" href="#135">135</a>     <strong>public</strong> <strong>static</strong> String readFullyAsString(InputStream inputStream)
<a name="136" href="#136">136</a>     throws IOException {
<a name="137" href="#137">137</a>         StringBuffer sb = <strong>new</strong> StringBuffer();
<a name="138" href="#138">138</a>         <strong>int</strong> c;
<a name="139" href="#139">139</a>         <strong>while</strong>((c = inputStream.read()) > -1) {
<a name="140" href="#140">140</a>             sb.append((<strong>char</strong>)c);
<a name="141" href="#141">141</a>         }
<a name="142" href="#142">142</a>         <strong>return</strong> sb.toString();
<a name="143" href="#143">143</a>     }
<a name="144" href="#144">144</a>     
<a name="145" href="#145">145</a>     <em>/**<em>*</em></em>
<a name="146" href="#146">146</a> <em>     * Read the entire stream to EOF into the passed file.</em>
<a name="147" href="#147">147</a> <em>     * @param is</em>
<a name="148" href="#148">148</a> <em>     * @param toFile File to read into .</em>
<a name="149" href="#149">149</a> <em>     * @throws IOException </em>
<a name="150" href="#150">150</a> <em>     * @throws IOException</em>
<a name="151" href="#151">151</a> <em>     */</em>
<a name="152" href="#152">152</a>     <strong>public</strong> <strong>static</strong> <strong>void</strong> readFullyToFile(InputStream is,
<a name="153" href="#153">153</a>             File toFile) throws IOException {
<a name="154" href="#154">154</a>         readFullyToFile(is, toFile, <strong>new</strong> byte[4096]);
<a name="155" href="#155">155</a>     }
<a name="156" href="#156">156</a>     
<a name="157" href="#157">157</a>     <em>/**<em>*</em></em>
<a name="158" href="#158">158</a> <em>     * Read the entire stream to EOF into the passed file.</em>
<a name="159" href="#159">159</a> <em>     * Closes &lt;code>is&lt;/code> when done or if an exception.</em>
<a name="160" href="#160">160</a> <em>     * @param is Stream to read.</em>
<a name="161" href="#161">161</a> <em>     * @param toFile File to read into .</em>
<a name="162" href="#162">162</a> <em>     * @param buffer Buffer to use reading.</em>
<a name="163" href="#163">163</a> <em>     * @return Count of bytes read.</em>
<a name="164" href="#164">164</a> <em>     * @throws IOException</em>
<a name="165" href="#165">165</a> <em>     */</em>
<a name="166" href="#166">166</a>     <strong>public</strong> <strong>static</strong> <strong>long</strong> readFullyToFile(<strong>final</strong> InputStream is, <strong>final</strong> File toFile,
<a name="167" href="#167">167</a>             <strong>final</strong> byte [] buffer)
<a name="168" href="#168">168</a>     throws IOException {
<a name="169" href="#169">169</a>         <strong>long</strong> totalcount = -1;
<a name="170" href="#170">170</a>         OutputStream os =
<a name="171" href="#171">171</a>             <strong>new</strong> FastBufferedOutputStream(<strong>new</strong> FileOutputStream(toFile));
<a name="172" href="#172">172</a>         InputStream localIs = (is instanceof BufferedInputStream)?
<a name="173" href="#173">173</a>             is: <strong>new</strong> BufferedInputStream(is);
<a name="174" href="#174">174</a>         <strong>try</strong> {
<a name="175" href="#175">175</a>             <strong>for</strong> (<strong>int</strong> count = -1;
<a name="176" href="#176">176</a>                 (count = localIs.read(buffer, 0, buffer.length)) != -1;
<a name="177" href="#177">177</a>                     totalcount += count) {
<a name="178" href="#178">178</a>                 os.write(buffer, 0, count);  
<a name="179" href="#179">179</a>             }
<a name="180" href="#180">180</a>         } <strong>finally</strong> {
<a name="181" href="#181">181</a>             os.close();
<a name="182" href="#182">182</a>             <strong>if</strong> (localIs != <strong>null</strong>) {
<a name="183" href="#183">183</a>                 localIs.close();
<a name="184" href="#184">184</a>             }
<a name="185" href="#185">185</a>         }
<a name="186" href="#186">186</a>         <strong>return</strong> totalcount;
<a name="187" href="#187">187</a>     }
<a name="188" href="#188">188</a> 
<a name="189" href="#189">189</a>     <em>/**<em>*</em></em>
<a name="190" href="#190">190</a> <em>     * Wrap generic Throwable as a checked IOException</em>
<a name="191" href="#191">191</a> <em>     * @param e wrapped exception</em>
<a name="192" href="#192">192</a> <em>     * @return IOException</em>
<a name="193" href="#193">193</a> <em>     */</em>
<a name="194" href="#194">194</a>     <strong>public</strong> <strong>static</strong> IOException wrapAsIOException(Throwable e) {
<a name="195" href="#195">195</a>         IOException ioe = <strong>new</strong> IOException(e.toString());
<a name="196" href="#196">196</a>         ioe.initCause(e);
<a name="197" href="#197">197</a>         <strong>return</strong> ioe;
<a name="198" href="#198">198</a>     }
<a name="199" href="#199">199</a> }
</pre>
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