Java 常用的工具接口包括文件压缩，解压缩，IP转换，文件删除（解决中文问题） .

import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.util.Enumeration;import org.apache.log4j.Logger;import org.apache.tools.zip.ZipEntry;import org.apache.tools.zip.ZipFile;import org.apache.tools.zip.ZipOutputStream;import com.captech.lang.ErrorType;import com.captech.ws.rs.WebApplicationException;public class CommonUtils {protected static Logger logger = Logger.getLogger(CommonUtils.class);public static long getStringIpToLong(String ip) {ip = ip.trim();String[] ips = ip.split("[.]");long num = 16777216L * Long.parseLong(ips[0]) + 65536L* Long.parseLong(ips[1]) + 256 * Long.parseLong(ips[2])+ Long.parseLong(ips[3]);return num;}    public static String longToIP(long longIp) {           StringBuffer sb = new StringBuffer("");           sb.append(String.valueOf((longIp >>> 24)));           sb.append(".");           sb.append(String.valueOf((longIp & 0x00FFFFFF) >>> 16));           sb.append(".");           sb.append(String.valueOf((longIp & 0x0000FFFF) >>> 8));           sb.append(".");           sb.append(String.valueOf((longIp & 0x000000FF)));           return sb.toString();       }        public static File zipFiles (String filePath, String zipname){FileOutputStream fos=null;ZipOutputStream zipOut=null;File fileList = new File(filePath);if(fileList.exists() && fileList.isDirectory()){File[] files=fileList.listFiles();try { File out = new File(zipname); if(!out.exists()){  out.createNewFile(); } fos = new FileOutputStream(out);//创建文件输出流（低级流） zipOut = new ZipOutputStream(fos);//创建zip文件输出流         zipOut.setEncoding("gbk");         int i = 0;         for (i = 0; i < files.length; i++) {          writeFile(files[i], zipOut, "");         }         zipOut.close();         return out; }catch(IOException e){ throw createAndLogException(ErrorType.FILE_WRITE_ERROR, e); }}else{   throw createAndLogException(ErrorType.FILE_OPEN_ERROR, new Exception("file Not exist"));}    }        public static void writeFile(File file, ZipOutputStream zipOut, String base){    try {    if(file.isDirectory()){    File[] files = file.listFiles();    base = base + file.getName() + File.separator;    zipOut.putNextEntry(new ZipEntry(base));    for (int i = 0; i < files.length; i++) {    writeFile(files[i], zipOut, base);    }    }else{    base = base + file.getName();    BufferedReader in=new BufferedReader(new InputStreamReader(new FileInputStream(file),"ISO8859_1"));      ZipEntry ze = new ZipEntry(base);    zipOut.putNextEntry(ze);    int c = 0;    while ((c = in.read()) != -1) {        zipOut.write(c);    }    in.close();    }} catch(Exception e){     throw createAndLogException(ErrorType.FILE_WRITE_ERROR, e);    }    }    //删除文件夹的接口public static boolean deleteDirectory(File file){if( file.exists() ) {         File[] files = file.listFiles();         for(int i=0; i<files.length; i++) {            if(files[i].isDirectory()) {              deleteDirectory(files[i]);            }            else {              files[i].delete();            }      }   }   return( file.delete());}    //复制文件的接口public  static void copyFile(File sourceFile,File targetFile) {       // 新建文件输入流并对它进行缓冲   try {  if(!targetFile.getParentFile().exists()){  targetFile.getParentFile().mkdir();  }  if(!targetFile.exists()){  targetFile.createNewFile();  }FileInputStream input = new FileInputStream(sourceFile); BufferedInputStream inBuff=new BufferedInputStream(input); // 新建文件输出流并对它进行缓冲 FileOutputStream output = new FileOutputStream(targetFile); BufferedOutputStream outBuff=new BufferedOutputStream(output);  // 缓冲数组 byte[] b = new byte[1024 * 5]; int len; while ((len =inBuff.read(b)) != -1) {     outBuff.write(b, 0, len); } // 刷新此缓冲的输出流 outBuff.flush();  //关闭流 inBuff.close(); outBuff.close(); output.close(); input.close();} catch (Exception e) {throw createAndLogException(ErrorType.FILE_WRITE_ERROR, e);} }@SuppressWarnings("unchecked")public static void unzipFile(String unzipfile, String outputDirectory){try {ZipFile zipFile = new ZipFile(unzipfile,"GBK");ZipEntry entry;// 创建文件夹Enumeration<ZipEntry> e = zipFile.getEntries();while (e.hasMoreElements()) {entry = e.nextElement();String name = entry.getName();if (!name.endsWith(File.separator)) {File f = new File(outputDirectory + File.separator + entry.getName());if (!f.getParentFile().exists()) {f.getParentFile().mkdirs();}InputStream in = zipFile.getInputStream(entry);FileOutputStream out = new FileOutputStream(f);int c;byte[] by = new byte[1024];while ((c = in.read(by)) != -1) {out.write(by, 0, c);}out.close();in.close();}}zipFile.close();} catch (IOException e) {createAndLogException(ErrorType.FILE_OPEN_ERROR, new Throwable("unzip file error"));}}

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