Apache-common项目提供的工具

---- MD5加密与生成UUID例子（依赖于commons-io.jar）：begin ----------------------------------------------------------------------------------------------------

package com.mengyao.jdoc.commons;

import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.id.Hex;
import org.apache.commons.id.uuid.UUID;

/**
 *
 * @author mengyao
 *
 */
public class Utils {

    /**
     * 使用MD5单向加密方式加密指定字符串
     * @param str 待转换字符串
     * 依赖于commons-codec.jar实现
     * @return
     */
    public static String getMD5Str(String str){
        return DigestUtils.md5Hex(str);
    }
    
    /**
     * 获取UUID
     * 依赖于apache-commons-id.jar、commons-discovery.jar实现
     * @return
     */
    public static String getUUID() {
        return new String(Hex.encodeHex(UUID.randomUUID().getRawBytes()));
    }
    
    public static void main(String[] args) {
        System.out.println(getUUID());
        System.out.println(getMD5Str("123456"));
    }
}

---- MD5加密与生成UUID例子（依赖于commons-io.jar）：end----------------------------------------------------------------------------------------------------

 

---- 监控文件变化例子（依赖于commons-io.jar）：begin ----------------------------------------------------------------------------------------------------

package com.lefukj.parser.watcher;

import java.io.File;

import org.apache.commons.io.monitor.FileAlterationListenerAdaptor;
import org.apache.commons.io.monitor.FileAlterationObserver;

/**
 *
 * @author mengyao
 *
 */
public class FileListener extends FileAlterationListenerAdaptor {  
 
    /**
     * 文件创建执行
     */  
    @Override  
    public void onFileCreate(File file) {  
        System.out.println("[新建]:" + file.getAbsolutePath());  
    }  
 
    /**
     * 文件创建修改
     */  
    @Override  
    public void onFileChange(File file) {  
        System.out.println("[修改]:" + file.getAbsolutePath());  
    }  
 
    /**
     * 文件删除
     */  
    @Override  
    public void onFileDelete(File file) {  
        System.out.println("[删除]:" + file.getAbsolutePath());  
    }  
 
    /**
     * 目录创建
     */  
    @Override  
    public void onDirectoryCreate(File directory) {  
        System.out.println("[新建]:" + directory.getAbsolutePath());  
    }  
 
    /**
     * 目录修改
     */  
    @Override  
    public void onDirectoryChange(File directory) {  
        System.out.println("[修改]:" + directory.getAbsolutePath());  
    }  
 
    /**
     * 目录删除
     */  
    @Override  
    public void onDirectoryDelete(File directory) {  
        System.out.println("[删除]:" + directory.getAbsolutePath());  
    }  
 
    @Override  
    public void onStart(FileAlterationObserver observer) {  
        super.onStart(observer);  
    }  
 
    @Override  
    public void onStop(FileAlterationObserver observer) {  
        super.onStop(observer);  
    }  
 
} 

 

package com.lefukj.parser.watcher;

import java.util.concurrent.TimeUnit;

import org.apache.commons.io.filefilter.FileFilterUtils;
import org.apache.commons.io.monitor.FileAlterationMonitor;
import org.apache.commons.io.monitor.FileAlterationObserver;

/**
 *
 * @author mengyao
 *
 */
public class FileMonitorTest {

    /**
     * @param args
     */
    public static void main(String[] args) throws Exception {
        // 监控目录
        String rootDir = "D:/caiji";
        // 轮询间隔1 秒
        long interval = TimeUnit.SECONDS.toMillis(1);
        // 创建一个文件观察器用于处理文件的格式
        FileAlterationObserver observer = new FileAlterationObserver(rootDir,
                FileFilterUtils.and(FileFilterUtils.fileFileFilter(),
                        FileFilterUtils.suffixFileFilter(".dat")), // 过滤文件格式
                null);
        // FileAlterationObserver _observer = new
        // FileAlterationObserver(rootDir);

        observer.addListener(new FileListener()); // 设置文件变化监听器
        // 创建文件变化监听器
        FileAlterationMonitor monitor = new FileAlterationMonitor(interval,
                observer);
        // 开始监控
        monitor.start();
    }

}

---- 监控文件变化例子（依赖于commons-io.jar）：end ----------------------------------------------------------------------------------------------------

 

---- 文件读写操作例子（依赖于commons-io.jar）：begin ----------------------------------------------------------------------------------------------------

package com.lefukj.parser.utils;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.SystemUtils;

import com.lefukj.parser.configuration.Configuration;

/**
 *
 * @author mengyao
 *
 */
@SuppressWarnings("all")
public class FileUtil {

    public static String getPath(){
        String os = SystemUtils.OS_NAME;
        String path = null;
        if (os.contains("Windows") || os.contains("windows")) {
            path = Configuration.WINDOWS_FILE_DIR;             
        } else if (os.contains("Linux") || os.contains("linux")) {
            path = Configuration.LINUX_FILE_DIR;
        }
        
        return path;
    }
    
    public static File getFile(String path, String fileName){
        File file = new File(path);
        if(!file.isDirectory()){
            file.mkdir();
        }
        file = new File(path+fileName);
        return file;
    }
    
    public static boolean writeFile(String path, String fileName, List<?> lines, boolean append) {
        boolean status = false;
        FileWriter writer = null;
        try {
            File file = new File(path);
            if(!file.isDirectory()){
                file.mkdir();
            }
            file = new File(path+fileName);
            writer = new FileWriter(file, append);
            IOUtils.writeLines(lines, null, writer);
            status = true;
        } catch (IOException e) {
            e.printStackTrace();
            throw new RuntimeException(e);
        } finally {
            try {
                writer.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        
        return status;
    }
    
    public static List<String> readFile(String path){
        FileUtils fileUtils = new FileUtils();
        List<String> readLines = null;
        try {
            File file = new File(path);
            readLines = fileUtils.readLines(file);
        } catch (IOException e) {
        }
        return readLines;
    }
    
    public static long getFileLastUpdateTime(File file){
        long lastModified = file.lastModified();
        
        return lastModified;
    }
    
    public static void main(String[] args) {
        File file = new File("D:/caiji/users.dat");
        System.out.println(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date(file.lastModified())));
        //2015-07-25 20:30:37
        //2015-07-25 20:44:01
    }
    
}

---- 文件读写操作例子（依赖于commons-io.jar）：end ----------------------------------------------------------------------------------------------------