小工具 - 批量删除Maven下载失败的文件夹

用过Maven的应该都遇到过，当网速不好或者源有问题的时候，Maven的依赖包经常下载失败。

下载失败后在本地仓库对应的文件夹中有一个以.lastUpdated结尾的文件，如果不手动删除这个文件，就不能重新更新依赖，重新下载对应的jar包。一般情况下遇到的时候可能直接手动找到目录删除。

当出现很多这样的情况时，一个个找起来也很麻烦。

因此本文提供一个小工具，就是一段Java代码，通过这段代码来删除。

CleanMvn.java:

<code class="language-java hljs  has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">CleanMvn</span> {</span>    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">main</span>(String[] args){        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(args.length != <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>){            print(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"使用方法错误，方法需要一个参数，参数为mvn本地仓库的路径"</span>);        }        findAndDelete(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> File(args[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>]);    }    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">boolean</span> <span class="hljs-title" style="box-sizing: border-box;">findAndDelete</span>(File file){        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(!file.exists()){        } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(file.isFile()){            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(file.getName.endsWith(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"lastUpdated"</span>)){                deleteFile(file.getParentFile());                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">true</span>;            }        } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(file.isDirectory()){            File[] files = file.listFiles();            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span>(File f : files){                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(findAndDelete(f)){                    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>;                }            }        }        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">false</span>;    }    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">deleteFile</span>(File file){        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(!file.exists()){        } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(file.isFile()){            print(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"删除文件:"</span> + file.getAbsolutePath());            file.delete();        } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(file.isDirectory()){            File[] files = file.listFiles();            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span>(File f : files){                deleteFile(f);            }            print(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"删除文件夹:"</span> + file.getAbsolutePath());            print(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"===================================="</span>);            file.delete();        }    }    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">print</span>(String msg){        System.out.println(msg);    }}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; 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可以在IDE中指定参数后运行这段代码，例如直接调方法findAndDelete(new File("d:\\.m2\\repository"));

或者在命令行下执行这段代码：

• 首先javac CleanMvn.java编译为.class文件。

• 然后Java CleanMvn d:\.m2\repository通过后面的参数来删除本地仓库中无效的文件。

转自：http://blog.csdn.net/isea533/article/details/49905659