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struts2多文件动态下载及中文解决方案

 
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<p>来源：<a href="http://jianglubin1.blog.163.com/blog/static/13177713420101245426740/">http://jianglubin1.blog.163.com/blog/static/13177713420101245426740/</a></p>
<p> </p>
<p>关于文件上传的例子，网上已经有很多，所以本文就不谈文件上传，重点是文件下载及文件名为中文的时候各个浏览器出现乱码的解决方案。
</p>
<p> </p>
<p>下面是jsp文件的代码：</p>
<p> </p>
相应的DownloadAction.java的代码：<br><ol>
<li>
<span>&lt;</span><span>html</span><span>&gt;</span>
</li>
<li>
<span>  </span><span>&lt;</span><span>head</span><span>&gt;</span>
</li>
<li>
<span>   </span><span>&lt;</span><span>title</span><span>&gt;</span><span>download</span><span>&lt;/</span><span>title</span><span>&gt;</span>
</li>
<li>
<span>  </span><span>&lt;/</span><span>head</span><span>&gt;</span>
</li>
<li>
<span>  </span><span>&lt;</span><span>body</span><span>&gt;</span>
</li>
<li>
<span>   </span><span>&lt;</span><span>%</span>
</li>
<li>
<span>    //取得服务器</span><span>"</span><span>/download/file</span><span>"</span><span>目录的物理路径</span>
</li>
<li>
<span>    </span><span>String</span><span> </span><span>path</span><span> = </span><span>request</span><span>.</span><span>getRealPath</span><span>(</span><span>"</span><span>/download/file</span><span>"</span><span>);</span>
</li>
<li>
<span>    //取得</span><span>"</span><span>/download/file</span><span>"</span><span>目录的</span><span>file</span><span>对象</span>
</li>
<li>
<span>    </span><span>File</span><span> </span><span>file</span><span> = </span><span>new</span><span> </span><span>File</span><span>(</span><span>path</span><span>);</span>
</li>
<li>
<span>    //取得</span><span>file</span><span>目录下所有文件</span>
</li>
<li>
<span>    </span><span>File</span><span>[] </span><span>files</span><span> = </span><span>file</span><span>.</span><span>listFiles</span><span>();</span>
</li>
<li>
</li>
<li>
<span>   </span><span>for</span><span> (</span><span>int</span><span> </span><span>i</span><span> = </span><span>0</span><span>; </span><span>i</span><span> &lt; </span><span>files</span><span>.</span><span>length</span><span>; </span><span>i</span><span>++) {</span>
</li>
<li>
</li>
<li>
<span>    </span><span>String</span><span> </span><span>fname</span><span> = </span><span>files</span><span>[</span><span>i</span><span>].</span><span>getName</span><span>();</span>
</li>
<li>
</li>
<li>
<span>    //对文件名进行</span><span>url</span><span>编码(</span><span>UTF-8</span><span>指明</span><span>fname</span><span>原来的编码，</span><span>UTF-8</span><span>一般由本地编码</span><span>GBK</span><span>代替)</span>
</li>
<li>
<span>     </span><span>fname</span><span> = </span><span>java</span><span>.</span><span>net</span><span>.</span><span>URLEncoder</span><span>.</span><span>encode</span><span>(</span><span>fname</span><span>, </span><span>"</span><span>UTF-8</span><span>"</span><span>);</span>
</li>
<li>
</li>
<li>
<span>    </span><span>out</span><span>.</span><span>println</span><span>(</span><span>"</span><span>&lt;a href=download.action?name=</span><span>"</span><span> + </span><span>fname</span><span> + </span><span>"</span><span>&gt;</span><span>"</span>
</li>
<li>
<span>     + </span><span>files</span><span>[</span><span>i</span><span>].</span><span>getName</span><span>() + </span><span>"</span><span>&lt;/a&gt;&lt;br&gt;</span><span>"</span><span>);</span>
</li>
<li><span>    }</span></li>
<li>
<span>   %</span><span>&gt;</span>
</li>
<li>
<span>  </span><span>&lt;/</span><span>body</span><span>&gt;</span>
</li>
<li>
<span> </span><span>&lt;/</span><span>html</span><span>&gt;</span>
</li>
</ol> <span>相应的<span lang="EN-US">DownloadAction.java</span>的代码：<span lang="EN-US"><br><br></span></span>
<p> </p>
<ol>
<li>
<span>package</span><span> </span><span>com</span><span>.</span><span>test</span><span>.</span><span>action</span><span>;</span>
</li>
<li>
</li>
<li>
<span>import</span><span> </span><span>java</span><span>.</span><span>io</span><span>.</span><span>InputStream</span><span>;</span>
</li>
<li>
<span> </span><span>import</span><span> </span><span>java</span><span>.</span><span>io</span><span>.</span><span>UnsupportedEncodingException</span><span>;</span>
</li>
<li>
<span> </span><span>import</span><span> </span><span>com</span><span>.</span><span>opensymphony</span><span>.</span><span>xwork2</span><span>.</span><span>ActionSupport</span><span>;</span>
</li>
<li>
<span> </span><span>import</span><span> </span><span>org</span><span>.</span><span>apache</span><span>.</span><span>struts2</span><span>.</span><span>ServletActionContext</span><span>;</span>
</li>
<li>
</li>
<li>
<span>public</span><span> </span><span>class</span><span> </span><span>DownloadAction</span><span> </span><span>extends</span><span> </span><span>ActionSupport</span><span> </span><span>{</span>
</li>
<li>
<span>     </span><span>private</span><span> </span><span>static</span><span> </span><span>final</span><span> </span><span>long</span><span> </span><span>serialVersionUID</span><span> = </span><span>6329383258366253255</span><span>L</span><span>;</span>
</li>
<li><span> </span></li>
<li>
<span>     </span><span>private</span><span> </span><span>String</span><span> </span><span>fileName</span><span>;</span>
</li>
<li><span> </span></li>
<li>
<span>     </span><span>public</span><span> </span><span>void</span><span> </span><span>setFileName</span><span>(){</span>
</li>
<li>
<span>         </span><span>//得到请求下载的文件名</span>
</li>
<li>
<span>         </span><span>String</span><span> </span><span>fname</span><span>=</span><span>ServletActionContext</span><span>.</span><span>getRequest</span><span>()</span><span>.</span><span>getParameter</span><span>(</span><span>"</span><span>name</span><span>"</span><span>)</span><span>; </span>
</li>
<li>
<span>         </span><span>try</span><span> </span><span>{</span>
</li>
<li>
<span>         </span><span>/*</span>
</li>
<li><span>          * 对fname参数进行UTF-8解码,注意:实际进行UTF-8解码时会使用本地编码，本机为GBK。</span></li>
<li><span>          * 这里使用request.setCharacterEncoding解码无效.</span></li>
<li><span>          * 只有解码了getDownloadFile()方法才能在下载目录下正确找到请求的文件</span></li>
<li>
<span>          * */</span><span>  </span>
</li>
<li>
<span>               </span><span>fname</span><span> = </span><span>new</span><span> </span><span>String</span><span>(</span><span>fname</span><span>.</span><span>getBytes</span><span>(</span><span>"</span><span>ISO-8859-1</span><span>"</span><span>)</span><span>, </span><span>"</span><span>UTF-8</span><span>"</span><span>)</span><span>;</span>
</li>
<li>
</li>
<li>
<span>       </span><span>}</span><span> </span><span>catch</span><span> </span><span>(</span><span>Exception</span><span> </span><span>e</span><span>)</span><span> </span><span>{</span>
</li>
<li>
<span>             </span><span>e</span><span>.</span><span>printStackTrace</span><span>()</span><span>;</span>
</li>
<li>
<span>        </span><span>}</span><span>  </span>
</li>
<li>
<span>        </span><span>this</span><span>.</span><span>fileName</span><span>=</span><span>fname</span><span>;  </span>
</li>
<li>
<span>        </span><span>System</span><span>.</span><span>out</span><span>.</span><span>println</span><span>(</span><span>fileName</span><span>)</span><span>; </span>
</li>
<li>
<span>    </span><span>}</span>
</li>
<li><span> </span></li>
<li>
<span>       </span><span>/*</span>
</li>
<li>
<span>        *</span><span> @getFileName</span>
</li>
<li><span>        * 此方法对应的是struts.xml文件中的：</span></li>
<li><span>        * &lt;param &gt;attachment;filename="${fileName}"&lt;/param&gt;</span></li>
<li><span>        * 这个属性设置的是下载工具下载文件时显示的文件名，</span></li>
<li><span>        * 要想正确的显示中文文件名，我们需要对fileName再次编码</span></li>
<li><span>        * 否则中文名文件将出现乱码，或无法下载的情况</span></li>
<li><span>        * */</span></li>
<li>
<span>      </span><span>public</span><span> </span><span>String</span><span> </span><span>getFileName</span><span>()</span><span> </span><span>throws</span><span> </span><span>UnsupportedEncodingException</span><span> </span><span>{</span>
</li>
<li><span>  </span></li>
<li>
<span>          </span><span>fileName</span><span>=</span><span>new</span><span> </span><span>String</span><span>(</span><span>fileName</span><span>.</span><span>getBytes</span><span>()</span><span>,</span><span>"</span><span>ISO-8859-1</span><span>"</span><span>)</span><span>;</span>
</li>
<li><span>  </span></li>
<li>
<span>          </span><span>return</span><span> </span><span>fileName</span><span>;</span>
</li>
<li>
<span>      </span><span>}</span>
</li>
<li>
</li>
<li>
<span>     </span><span>/*</span>
</li>
<li>
<span>       *</span><span> @getDownloadFile</span>
</li>
<li><span>       * 此方法对应的是struts.xml文件中的：</span></li>
<li><span>       * &lt;param &gt;downloadFile&lt;/param&gt;</span></li>
<li><span>       * 返回下载文件的流，可以参看struts2的源码</span></li>
<li><span>       * */</span></li>
<li>
<span>      </span><span>public</span><span> </span><span>InputStream</span><span> </span><span>getDownloadFile</span><span>()</span><span> </span><span>{</span>
</li>
<li><span>  </span></li>
<li>
<span>         </span><span>this</span><span>.</span><span>setFileName</span><span>()</span><span>;</span>
</li>
<li>
</li>
<li>
<span>         </span><span>return</span><span> </span><span>ServletActionContext</span><span>.</span><span>getServletContext</span><span>()</span><span>.</span><span>getResourceAsStream</span><span>(</span><span>"</span><span>/download/file/</span><span>"</span><span> + </span><span>fileName</span><span>)</span><span>;</span>
</li>
<li>
<span>      </span><span>}</span>
</li>
<li>
</li>
<li>
<span>     @</span><span>Override</span>
</li>
<li>
<span>      </span><span>public</span><span> </span><span>String</span><span> </span><span>execute</span><span>()</span><span> </span><span>throws</span><span> </span><span>Exception</span><span> </span><span>{</span>
</li>
<li>
<span>          </span><span>return</span><span> </span><span>SUCCESS</span><span>;</span>
</li>
<li>
<span>     </span><span>}</span>
</li>
<li>
<span> </span><span>}</span>
</li>
</ol>
<p>struts.xml相应的Action配置：</p>
<ol>
<li>
<span>&lt;</span><span>action</span><span> </span><span>name</span><span>=</span><span>"</span><span>download</span><span>"</span><span> </span><span>class</span><span>=</span><span>"</span><span>com.test.action.DownloadAction</span><span>"</span><span>&gt;</span>
</li>
<li>
<span>      </span><span>&lt;</span><span>result</span><span> </span><span>name</span><span>=</span><span>"</span><span>success</span><span>"</span><span> </span><span>type</span><span>=</span><span>"</span><span>stream</span><span>"</span><span>&gt;</span>
</li>
<li>
<span>          </span><span>&lt;</span><span>param</span><span> </span><span>name</span><span>=</span><span>"</span><span>contentDisposition</span><span>"</span><span>&gt;</span><span>attachment;filename="${fileName}"</span><span>&lt;/</span><span>param</span><span>&gt;</span><span> </span>
</li>
<li>
<span>          </span><span>&lt;</span><span>param</span><span> </span><span>name</span><span>=</span><span>"</span><span>inputName</span><span>"</span><span>&gt;</span><span>downloadFile</span><span>&lt;/</span><span>param</span><span>&gt;</span>
</li>
<li>
<span>      </span><span>&lt;/</span><span>result</span><span>&gt;</span>
</li>
<li>
<span>   </span><span>&lt;/</span><span>action</span><span>&gt;</span>
</li>
</ol>
<p>web.xml:</p>
<ol>
<li>
<span>&lt;</span><span>filter</span><span>&gt;</span>
</li>
<li>
<span>    </span><span>&lt;</span><span>filter-name</span><span>&gt;</span><span>struts2</span><span>&lt;/</span><span>filter-name</span><span>&gt;</span>
</li>
<li>
<span>    </span><span>&lt;</span><span>filter-class</span><span>&gt;</span><span>org.apache.struts2.dispatcher.FilterDispatcher</span><span>&lt;/</span><span>filter-class</span><span>&gt;</span>
</li>
<li>
<span> </span><span>&lt;/</span><span>filter</span><span>&gt;</span>
</li>
<li>
<span>  </span><span>&lt;</span><span>filter-mapping</span><span>&gt;</span>
</li>
<li>
<span>    </span><span>&lt;</span><span>filter-name</span><span>&gt;</span><span>struts2</span><span>&lt;/</span><span>filter-name</span><span>&gt;</span>
</li>
<li>
<span>    </span><span>&lt;</span><span>url-pattern</span><span>&gt;</span><span>/*</span><span>&lt;/</span><span>url-pattern</span><span>&gt;</span>
</li>
<li>
<span>  </span><span>&lt;/</span><span>filter-mapping</span><span>&gt;</span>
</li>
<li><span> </span></li>
<li>
<span>  </span><span>&lt;</span><span>welcome-file-list</span><span>&gt;</span>
</li>
<li>
<span>    </span><span>&lt;</span><span>welcome-file</span><span>&gt;</span><span>download.jsp</span><span>&lt;/</span><span>welcome-file</span><span>&gt;</span>
</li>
<li>
<span>  </span><span>&lt;/</span><span>welcome-file-list</span><span>&gt;</span>
</li>
</ol>
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