深入JAVA之 java 生成目录树工具类 v1

来源：互联网发布：win10 优化编辑：程序博客网时间：2024/06/06 05:47

目录树生成工具

{@linkplain #setDeep(int) 设置查询目录深度}
{@linkplain #setFileFilter(FileFilter)} 设置查询文件筛选过滤器}
{@linkplain #showLength()} 显示文件大小内容}
{@linkplain #showModify() 显示文件修改时间内容}
{@linkplain #showPermission() 显示文件权限内容}
{@linkplain #addAppendContent(AppendContent) 自定义显示文件内容信息}

github 源码 DirectoryTreeV1

本地源码

package com.gourd.erwa.util;import com.gourd.erwa.util.annotation.NotNull;import java.io.File;import java.io.FileFilter;import java.util.*;import java.util.function.Function;/** * 目录树生成工具. * <p> * {@linkplain #setDeep(int) 设置查询目录深度} * {@linkplain #setFileFilter(FileFilter)}  设置查询文件筛选过滤器} * {@linkplain #showLength()} 显示文件大小内容} * {@linkplain #showModify() 显示文件修改时间内容} * {@linkplain #showPermission() 显示文件权限内容} * {@linkplain #addAppendContent(Function) 自定义显示文件内容信息} * * @author wei.Li * @version JDK1.8 * @since 1 */public class DirectoryTreeV1 {    /* 换行符*/    private static final String LINE_SEPARATOR = System.getProperty("line.separator");    /* 空字符串*/    private static final String EMPTY = "";    /* 文件连接符*/    private static final String VERTICAL = "│ ", INTERMEDIATE = "├─", END = "└─";    /* 目录间距*/    private static final String SPACING = "\t";    /* 结果集收集*/    private final StringBuilder r = new StringBuilder();    /* 默认查询文件目录深度,默认为Integer.MAX_VALUE */    private int deep = Integer.MAX_VALUE;    /* 文件筛选过滤器*/    private FileFilter fileFilter = pathname -> true;    /* 写出文件名及其他信息，默认只输出文件名称*/    private AppendTo displayContent = new AppendTo(file -> " " + file.getName());    private DirectoryTreeV1() {    }    private DirectoryTreeV1(DirectoryTreeV1 directoryTreeV1) {        this.fileFilter = directoryTreeV1.fileFilter;    }    /**     * Create tree tree.     *     * @param generateFile the generate file     * @return the tree     */    public static DirectoryTreeV1 create(File generateFile) {        return new DirectoryTreeV1();    }    /**     * 目录读取子文件.     *     * @param file the file     * @return the list     */    @NotNull    List<File> fetchFiles(File file) {        final File[] files = file.listFiles(this.fileFilter);        return files == null ? Collections.emptyList() : Arrays.asList(files);    }    /**     * 自定义文件筛选过滤器.     *     * @param customFilter the custom file filter     * @return the file filter     */    public DirectoryTreeV1 setFileFilter(FileFilter customFilter) {        this.fileFilter = customFilter;        return this;    }    /**     * 设置显示文件目录深度.     *     * @param deep the deep     * @return the deep     */    public DirectoryTreeV1 setDeep(int deep) {        this.deep = deep;        return this;    }    /**     * 自定义排序显示结果 tree.     *     * @param comparable the comparable     * @return the tree     */    public DirectoryTreeV1 sort(final Comparator<File> comparable) {        return new DirectoryTreeV1(this) {            @Override            List<File> fetchFiles(File file) {                final List<File> files = super.fetchFiles(file);                files.sort(comparable);                return files;            }        };    }    /**     * 显示文件大小.     *     * @return the tree     */    public DirectoryTreeV1 showLength() {        this.displayContent.add(file -> ("[" + file.length() + "B" + "]"));        return this;    }    /**     * 显示文件修改时间.     *     * @return the tree     */    public DirectoryTreeV1 showModify() {        this.displayContent.add(file -> ("[" + new Date(file.lastModified()) + "]"));        return this;    }    /**     * 显示文件权限.     *     * @return the tree     */    public DirectoryTreeV1 showPermission() {        this.displayContent.add(                file -> ("["                        + (file.canRead() ? "r-" : "--")                        + (file.canWrite() ? "w-" : "--")                        + (file.canExecute() ? "x-" : "--")                        + "]")        );        return this;    }    /**     * 自定义添加读取 file 解析内容到输出内容.     *     * @param appendContent the append content     * @return the tree     */    public DirectoryTreeV1 addAppendContent(Function<File, String> appendContent) {        this.displayContent.add(appendContent);        return this;    }    /**     * 生成文件.     *     * @return 结果内容     */    public final String generate(File generateFile) {        if (generateFile.exists()) {            this.generateHandle(generateFile, EMPTY, 0);        } else {            System.err.println(generateFile.getPath() + " not found!");        }        return this.r.toString();    }    private void generateHandle(File file, String prefix, int deep) {        final List<File> files = this.fetchFiles(file);        if (files.isEmpty()) {            return;        }        deep++;        final int length = files.size();        for (int i = 0; i < length; i++) {            final File f = files.get(i);            final boolean isLast = (i >= length - 1);            this.r.append(prefix).append(isLast ? END : INTERMEDIATE);            this.appendDisplayContent(f);            this.r.append(LINE_SEPARATOR);            if (f.isDirectory() && deep <= this.deep) {                this.generateHandle(f, prefix + (!(length <= 1 || isLast) ? VERTICAL : EMPTY) + SPACING, deep);            }        }    }    /**     * 处理定义文件内容     *     * @param f f     */    private void appendDisplayContent(File f) {        final List<Function<File, String>> appendContents = displayContent.appendContents;        for (Function<File, String> to : appendContents) {            this.r.append(to.apply(f));        }    }    /**     * 可累积显示 tree 中具体文件属性内容     */    private static class AppendTo {        private final List<Function<File, String>> appendContents = new ArrayList<>();        AppendTo(Function<File, String> appendTo) {            if (appendTo != null) {                this.appendContents.add(appendTo);            }        }        void add(Function<File, String> to) {            if (to != null) {                this.appendContents.add(0, to);            }        }    }}/** * The type Main Test. */class MainTest {    public static void main(String[] args) {        final File generateFile = new File("/lw/workfile/intellij_work/MyNote/design1");        final String generate = DirectoryTreeV1.create(generateFile)                .setDeep(20)                .setFileFilter(pathname -> (!(pathname.isHidden() || pathname.getName().contains("target"))))                /*.showLength()                .showModify()                .showPermission()                .addAppendContent(new DirectoryTreeV1.AppendContent() {                    @Override                    public String appendContent(File file) {                        return "[" + file.getPath() + "]";                    }                })*/                .generate(generateFile);        System.out.println(generate);    }}

生成效果

├─ buildNumber.properties├─ design.iml├─ pom.xml└─ src├─ main│ ├─ java│ │ └─ com│ │ └─ gourd│ │ └─ erwa│ │ └─ design│ │ ├─ abstractfactory│ │ │ └─ AbstractFactoryClient.java│ │ ├─ adapter│ │ │ └─ AdapterClient.java│ │ ├─ builder│ │ │ ├─ BuilderClient01.java│ │ │ ├─ BuilderClient02.java│ │ │ └─ builderClient02UML.jpg│ │ ├─ delegate│ │ │ ├─ ABitComplicated.java│ │ │ ├─ package-info.java│ │ │ └─ RealPrinter.java│ │ ├─ enjoy│ │ │ ├─ DataSourcesImpl.java│ │ │ ├─ DataSourcesInterface.java│ │ │ ├─ DataSourcesType.java│ │ │ ├─ EnjoyFactory.java│ │ │ └─ read.md│ │ ├─ factory│ │ │ └─ FactoryClient.java│ │ ├─ listener│ │ │ ├─ DemoEvent.java│ │ │ ├─ DemoListener.java│ │ │ ├─ Lights.java│ │ │ └─ TestDemo.java│ │ ├─ observer│ │ │ ├─ BeingWatched.java│ │ │ ├─ ObserverDemo.java│ │ │ ├─ read.md│ │ │ └─ Watcher.java│ │ ├─ package-info.java│ │ ├─ prototype│ │ │ ├─ prototype.uml│ │ │ └─ PrototypeClient.java│ │ ├─ proxy│ │ │ ├─ cglib│ │ │ │ ├─ BookFacadeCglib.java│ │ │ │ ├─ BookFacadeCglibProxy.java│ │ │ │ └─ Test_Cglib.java│ │ │ ├─ guava│ │ │ ├─ jdk│ │ │ │ ├─ BookFacadeJDKProxy.java│ │ │ │ ├─ IBookFacadeJDK.java│ │ │ │ ├─ IBookFacadeJDKImpl.java│ │ │ │ ├─ testGuava.java│ │ │ │ └─ testJDK.java│ │ │ └─ read.md│ │ ├─ responsibility│ │ │ ├─ read.md│ │ │ ├─ ResponsibilityClient01.java│ │ │ └─ ResponsibilityClient02.java│ │ ├─ singleton│ │ │ ├─ LazilySingleton.java│ │ │ ├─ read.md│ │ │ ├─ ResultSingleton.java│ │ │ ├─ Singleton.java│ │ │ └─ Test.java│ │ ├─ strategy│ │ │ ├─ read.md│ │ │ └─ StrategyClient_.java│ │ └─ template│ │ ├─ read.md│ │ └─ TemplateClient.java│ └─ resources└─ test└─ java└─ GroupTest.java

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