Java中的文件操作大全（每贴更新5个）

《Java中的文件操作大全（每贴更新5个）》有 8 条评论

1. hias_asia 说：

   2009 年 4 月 9 日下午 2:12

   6.清空文件夹
   File delfilefolder=new File(%%1);
   try {
     if (!delfilefolder.exists()) {
   delfilefolder.delete();
     }
   delfilefolder.mkdir();
     }
   catch (Exception e) {
     System.out.println(“清空目录操作出错”);
     e.printStackTrace();
   }

   7.读取文件
   // 逐行读取数据
   FileReader fr = new FileReader(%%1);
   BufferedReader br = new BufferedReader(fr);
   String %%2 = br.readLine();
   while (%%2 != null) {
   %%3
   %%2 = br.readLine();
   }
   br.close();
   fr.close();

   8.写入文件
   // 将数据写入文件
   FileWriter fw = new FileWriter(%%1);
   fw.write(%%2);
   fw.close();

   9.写入随机文件
   try {
   RandomAcessFile logFile=new RandomAcessFile(%%1,”rw”);
   long lg=logFile.length();
   logFile.seek(%%2);
   logFile.writeByte(%%3);
   }catch(IOException ioe){
   System.out.println(“无法写入文件：”+ioe.getMessage());
   }

   10.读取文件属性
   // 文件属性的取得
   File af = new File(%%1);
   if (af.exists()) {
   System.out.println(f.getName() + “的属性如下： 文件长度为：” + f.length());
   System.out.println(f.isFile() ? “是文件” : “不是文件”);
   System.out.println(f.isDirectory() ? “是目录” : “不是目录”);
   System.out.println(f.canRead() ? “可读取” : “不”);
   System.out.println(f.canWrite() ? “是隐藏文件” : “”);
   System.out.println(“文件夹的最后修改日期为：” + new Date(f.lastModified()));
   } else {
   System.out.println(f.getName() + “的属性如下：”);
   System.out.println(f.isFile() ? “是文件” : “不是文件”);
   System.out.println(f.isDirectory() ? “是目录” : “不是目录”);
   System.out.println(f.canRead() ? “可读取” : “不”);
   System.out.println(f.canWrite() ? “是隐藏文件” : “”);
   System.out.println(“文件的最后修改日期为：” + new Date(f.lastModified()));
   }
   if(f.canRead()){
   %%2
   }
   if(f.canWrite()){
   %%3
   }
2. hias_asia 说：

   2009 年 4 月 9 日下午 2:16

   11.写入属性
   File filereadonly=new File(%%1);
   try {
   boolean b=filereadonly.setReadOnly();
   }
   catch (Exception e) {
   System.out.println(“拒绝写访问：”+e.printStackTrace());
   }

   12.枚举一个文件夹中的所有文件夹
   ArrayList
   <String>
   folderList=new ArrayList
   <String>
   ();
   folderList.add(%%1);
   for(int j=0;j<folderList.length;j++){
   File file=new File(folderList[i]);
   File[] files=file.listFiles();
   ArrayList
   <File>
   fileList=new ArrayList
   <File>
   ();
   for(int i=0;i<files.length;i++){
   if(files[i].isDirectory()){
   folderList.add(files[i]);
   }
   else{
   fileList.add(files[i].getPath());
   }
   }
   for(File f:fileList){
   %%2=f.toString();
   %%3
   }
   }

   13.复制文件夹
   ArrayList
   <String>
   folderList=new ArrayList
   <String>
   ();
   folderList.add(%%1);
   ArrayList
   <String>
   folderList2=new ArrayList
   <String>
   ();
   folderList2.add(%%2);
   for(int j=0;j<folderList.length;j++){
       (new File(folderList2[j])).mkdirs(); //如果文件夹不存在 则建立新文件夹
       File folders=new File(folderList[j]);
       String[] file=folders.list();
       File temp=null;
       try {
         for (int i = 0; i < file.length; i++) {
           if(folderList[j].endsWith(File.separator)){
             temp=new File(folderList[j]+”/”+file[i]);
           }
           else{
             temp=new File(folderList[j]+”/”+File.separator+file[i]);
           }
             FileInputStream input = new FileInputStream(temp);
           if(temp.isFile()){
             FileInputStream input = new FileInputStream(temp);
             FileOutputStream output = new FileOutputStream(folderList2[j] + “/” +
                 (temp.getName()).toString());
             byte[] b = new byte[5120];
             int len;
             while ( (len = input.read(b)) != -1) {
               output.write(b, 0, len);
             }
             output.flush();
             output.close();
             input.close();
           }
           if(temp.isDirectory()){//如果是子文件夹
             folderList.add(folderList[j]+”/”+file[i]);
             folderList2.add(folderList2[j]+”/”+file[i]);
           }
         }
       }
       catch (Exception e) {
         System.out.println(“复制整个文件夹内容操作出错”);
         e.printStackTrace();
       }
   }

   14.复制一个文件夹下所有的文件夹到另一个文件夹下
   File copyfolders=new File(%%1);
   File[] copyfoldersList=copyfolders.listFiles();
   for(int k=0;k<copyfoldersList.length;k++){
   if(copyfoldersList[k].isDirectory()){
   ArrayList
   <String>
   folderList=new ArrayList
   <String>
   ();
   folderList.add(copyfoldersList[k].getPath());
   ArrayList
   <String>
   folderList2=new ArrayList
   <String>
   ();
   folderList2.add(%%2+”/”+copyfoldersList[k].getName());
   for(int j=0;j<folderList.length;j++){
       (new File(folderList2[j])).mkdirs(); //如果文件夹不存在 则建立新文件夹
       File folders=new File(folderList[j]);
       String[] file=folders.list();
       File temp=null;
       try {
         for (int i = 0; i < file.length; i++) {
           if(folderList[j].endsWith(File.separator)){
             temp=new File(folderList[j]+”/”+file[i]);
           }
           else{
             temp=new File(folderList[j]+”/”+File.separator+file[i]);
           }
             FileInputStream input = new FileInputStream(temp);
           if(temp.isFile()){
             FileInputStream input = new FileInputStream(temp);
             FileOutputStream output = new FileOutputStream(folderList2[j] + “/” +
                 (temp.getName()).toString());
             byte[] b = new byte[5120];
             int len;
             while ( (len = input.read(b)) != -1) {
               output.write(b, 0, len);
             }
             output.flush();
             output.close();
             input.close();
           }
           if(temp.isDirectory()){//如果是子文件夹
             folderList.add(folderList[j]+”/”+file[i]);
             folderList2.add(folderList2[j]+”/”+file[i]);
           }
         }
       }
       catch (Exception e) {
         System.out.println(“复制整个文件夹内容操作出错”);
         e.printStackTrace();
       }
   }
   }
   }

   15.移动文件夹
   ArrayList
   <String>
   folderList=new ArrayList
   <String>
   ();
   folderList.add(%%1);
   ArrayList
   <String>
   folderList2=new ArrayList
   <String>
   ();
   folderList2.add(%%2);
   for(int j=0;j<folderList.length;j++){
       (new File(folderList2[j])).mkdirs(); //如果文件夹不存在 则建立新文件夹
       File folders=new File(folderList[j]);
       String[] file=folders.list();
       File temp=null;
       try {
         for (int i = 0; i < file.length; i++) {
           if(folderList[j].endsWith(File.separator)){
             temp=new File(folderList[j]+”/”+file[i]);
           }
           else{
             temp=new File(folderList[j]+”/”+File.separator+file[i]);
           }
             FileInputStream input = new FileInputStream(temp);
           if(temp.isFile()){
             FileInputStream input = new FileInputStream(temp);
             FileOutputStream output = new FileOutputStream(folderList2[j] + “/” +
                 (temp.getName()).toString());
             byte[] b = new byte[5120];
             int len;
             while ( (len = input.read(b)) != -1) {
               output.write(b, 0, len);
             }
             output.flush();
             output.close();
             input.close();
           }
           if(temp.isDirectory()){//如果是子文件夹
             folderList.add(folderList[j]+”/”+file[i]);
             folderList2.add(folderList2[j]+”/”+file[i]);
           }
         }
       }
       catch (Exception e) {
         System.out.println(“复制整个文件夹内容操作出错”);
         e.printStackTrace();
       }
   }
   File movefile=new File(%%1);
   File[] movefiles=movefile.listFiles();
   for(int i=0;i<files.length;i++){
   if(files[i].isDirectory()){
   files[i].delete();
       }
   }
   movefile.delete();
3. hias_asia 说：

   2009 年 4 月 9 日下午 2:20

   15.移动一个文件夹下所有的文件夹到另一个目录下
   File movefolders=new File(%%1);
   File[] movefoldersList=movefolders.listFiles();
   for(int k=0;k<movefoldersList.length;k++){
   if(movefoldersList[k].isDirectory()){
   ArrayList
   <String>
   folderList=new ArrayList
   <String>
   ();
   folderList.add(movefoldersList[k].getPath());
   ArrayList
   <String>
   folderList2=new ArrayList
   <String>
   ();
   folderList2.add(%%2+”/”+movefoldersList[k].getName());
   for(int j=0;j<folderList.length;j++){
       (new File(folderList2[j])).mkdirs(); //如果文件夹不存在 则建立新文件夹
       File folders=new File(folderList[j]);
       String[] file=folders.list();
       File temp=null;
       try {
         for (int i = 0; i < file.length; i++) {
           if(folderList[j].endsWith(File.separator)){
             temp=new File(folderList[j]+”/”+file[i]);
           }
           else{
             temp=new File(folderList[j]+”/”+File.separator+file[i]);
           }
             FileInputStream input = new FileInputStream(temp);
           if(temp.isFile()){
             FileInputStream input = new FileInputStream(temp);
             FileOutputStream output = new FileOutputStream(folderList2[j] + “/” +
                 (temp.getName()).toString());
             byte[] b = new byte[5120];
             int len;
             while ( (len = input.read(b)) != -1) {
               output.write(b, 0, len);
             }
             output.flush();
             output.close();
             input.close();
   temp.delete();
           }
           if(temp.isDirectory()){//如果是子文件夹
             folderList.add(folderList[j]+”/”+file[i]);
             folderList2.add(folderList2[j]+”/”+file[i]);
           }
         }
       }
       catch (Exception e) {
         System.out.println(“复制整个文件夹内容操作出错”);
         e.printStackTrace();
       }
   }
   movefoldersList[k].delete();
   }
   }

   16.以一个文件夹的框架在另一个目录创建文件夹和空文件
   ArrayList
   <String>
   folderList=new ArrayList
   <String>
   ();
   folderList.add(%%1);
   ArrayList
   <String>
   folderList2=new ArrayList
   <String>
   ();
   folderList2.add(%%2);
   for(int j=0;j<folderList.length;j++){
       (new File(folderList2[j])).mkdirs(); //如果文件夹不存在 则建立新文件夹
       File folders=new File(folderList[j]);
       String[] file=folders.list();
       File temp=null;
       try {
         for (int i = 0; i < file.length; i++) {
           if(folderList[j].endsWith(File.separator)){
             temp=new File(folderList[j]+”/”+file[i]);
           }
           else{
             temp=new File(folderList[j]+”/”+File.separator+file[i]);
           }
             FileInputStream input = new FileInputStream(temp);
           if(temp.isFile()){
     if (!temp.exists()) {
   temp.createNewFile();
     }
           }
           if(temp.isDirectory()){//如果是子文件夹
             folderList.add(folderList[j]+”/”+file[i]);
             folderList2.add(folderList2[j]+”/”+file[i]);
           }
         }
       }
       catch (Exception e) {
         System.out.println(“复制整个文件夹内容操作出错”);
         e.printStackTrace();
       }
   }

   17.复制文件
         int bytesum = 0;
         int byteread = 0;
         File oldfile = new File(%%1);
       try {
         if (oldfile.exists()) { //文件存在时
           InputStream inStream = new FileInputStream(oldfile); //读入原文件
           FileOutputStream fs = new FileOutputStream(new File(%%2,oldfile.getName()));
           byte[] buffer = new byte[5120];
           int length;
           while ( (byteread = inStream.read(buffer)) != -1) {
             bytesum += byteread; //字节数 文件大小
             System.out.println(bytesum);
             fs.write(buffer, 0, byteread);
           }
           inStream.close();
         }
       }
       catch (Exception e) {
         System.out.println(“复制单个文件操作出错”);
         e.printStackTrace();
       }

   18.复制一个文件夹下所有的文件到另一个目录
   File copyfiles=new File(%%1);
   File[] files=copyfiles.listFiles();
   for(int i=0;i<files.length;i++){
   if(!files[i].isDirectory()){
         int bytesum = 0;
         int byteread = 0;
       try {
           InputStream inStream = new FileInputStream(files[i]); //读入原文件
           FileOutputStream fs = new FileOutputStream(new File(%%2,files[i].getName());
           byte[] buffer = new byte[5120];
           int length;
           while ( (byteread = inStream.read(buffer)) != -1) {
             bytesum += byteread; //字节数 文件大小
             System.out.println(bytesum);
             fs.write(buffer, 0, byteread);
           }
           inStream.close();
       }
       catch (Exception e) {
         System.out.println(“复制单个文件操作出错”);
         e.printStackTrace();
       }
   }
   }

   19.提取扩展名
   String %%2=(new File(%%1)).getName().split(“.”)[1];

   20.提取文件名
   String %%2=(new File(%%1)).getName().split(“//”)[1];
4. hias_asia 说：

   2009 年 4 月 9 日下午 2:24

   21.提取文件路径
   String %%2=(new File(%%1)).getPath();

   22.替换扩展名
   File replaceExt=new File(%%1);
   replaceExt.renameTo(replaceExt.getName().split(“.”)[0]+”.”+%%2);

   23.追加路径
   %%3=%%2+”/”+%%1

   24.移动文件
         int bytesum = 0;
         int byteread = 0;
         File oldfile = new File(%%1);
       try {
         if (oldfile.exists()) { //文件存在时
           InputStream inStream = new FileInputStream(oldfile); //读入原文件
           FileOutputStream fs = new FileOutputStream(new File(%%2,oldfile.getName()));
           byte[] buffer = new byte[5120];
           int length;
           while ( (byteread = inStream.read(buffer)) != -1) {
             bytesum += byteread; //字节数 文件大小
             //System.out.println(bytesum);
             fs.write(buffer, 0, byteread);
           }
           inStream.close();
   oldfile.delete();
         }
       }
       catch (Exception e) {
         System.out.println(“复制单个文件操作出错”);
         e.printStackTrace();
       }

   25.移动一个文件夹下所有文件到另一个目录
   File movefile=new File(%%1);
   File[] movefiles=movefile.listFiles();
   for(int i=0;i<movefiles.length;i++){
   if(movefiles[i].isFile()){
         int bytesum = 0;
         int byteread = 0;
         File oldfile = new File(movefiles[i]);
       try {
         if (oldfile.exists()) { //文件存在时
           InputStream inStream = new FileInputStream(oldfile); //读入原文件
           FileOutputStream fs = new FileOutputStream(new File(%%2,oldfile.getName()));
           byte[] buffer = new byte[5120];
           int length;
           while ( (byteread = inStream.read(buffer)) != -1) {
             bytesum += byteread; //字节数 文件大小
             //System.out.println(bytesum);
             fs.write(buffer, 0, byteread);
           }
           inStream.close();
   oldfile.delete();
         }
       }
       catch (Exception e) {
         System.out.println(“复制单个文件操作出错”);
         e.printStackTrace();
       }
   }
   }
5. hias_asia 说：

   2009 年 4 月 10 日上午 9:52

   31.文件简单解密
   //import java.io.*
   try {
   File f=new File(%%1);
   String strFileName = f.getName();
   FileInputStream fileInputStream = new FileInputStream(%%2+”\\enc_”+strFilename);
   byte[] buffer = new byte[fileInputStream.available()];
   FileInputStream.read(buffer);
   fileInputStream.close();
   for(int i=0;i<buffer.length;i++)
   {
   int ibt=buffer[i];
   ibt-=100;
   ibt+=256;
   ibt%=256;
   buffer[i]=(byte)ibt;
   }
   FileOutputStream fileOutputStream = new FileOutputStream(f);
   fileOutputStream.write(buffer,0,buffer.length);
   fileOutputStream.close();
   }
   catch(ArrayIndexOutOfBoundException e){
   e.printStackTrace();
   }
   catch(IOException e){
   e.printStackTrace();
   }

   32.读取ini文件属性
   //import java.io.*
   //import java.util.*;
   //import java.util.regex.*;
   //private HashMap configMap=null;
   private Map configMap=null;
   if(configMap==null) {
   String strLine=null;
   String currentNode=null;
   String previousNode=null;
   Vector vec=new Vector();
   int row=0;
   FileReader fileReader = new FileReader(%%1);
   BufferedReader bufferedReader=new BufferedReader(fileReader);
   try {
   while((strLine=bufferedReader.readLine())!=null) {
   String oneLine=strLine.trim();
   if(oneLine.length()>=1) {
   Pattern p=Pattern.compile(“\\[\\s*.*\\s*\\]“);
   int nodelen=oneLine.split(“[;]“).length;
   String[] strArray1=new String[4];
   if(nodelen==1) {
   oneLine=oneLine.split(“[;]“)[0].trim();
   }
   else if(nodelen==2) {
   strArray1[3]=oneLine.split(“[;]“)[1].trim();
   oneLine=oneLine.split(“[;]“)[0].trim();
   }
   Matcher m=p.matche(oneLine);
   if(m.matches()) {
   strArray1[0]=”@Node”;
   strArray1[1]=oneLine;
   strArray1[2]=”";
   } else {
   int keylen=oneLine.split(“=”).length;
   if(keylen==1) {
   strArray1[0]=”@Key”;
   strArray1[1]=oneLine.split(“=”)[0];
   strArray1[2]=”";
   } else if(kenlen==2) {
   strArray1[0]=”@Key”;
   strArray1[1]=oneLine.split(“=”)[0];
   strArray1[2]=oneLine.split(“=”)[1];
   } else {
   strArray1[0]=”@ElementError”;
   strArray1[1]=”";
   strArray1[2]=”";
   strArray1[3]=”";
   }
   }
   if(strArray1[0].equals(“@Node”)) {
   previousNode=currentNode;
   currentNode=strArray1[1];
   if(row>0) {
   configMap.put(previousNode,vec.elementAt(0));
   //”size:”+configMap.size()
   vec.clear();
   row=0;
   }
   } else if(strArray1[0].equals(“@Key”) && row==0) {
   Properties ht=new Properties();
   ht.setProperty(strArray1[1],strArray1[2]);
   vec.add(0,ht);
   row++;
   }
   } else if(strArray1[0].equals(“@Key”) && row>0) {
   Properties ht2=new Properties();
   ht2.put(strArray1[1],strArray1[2]);
   vec.clear();
   vec.add(0,ht2);
   row++;
   }
   }
   }
   configMap.put(currentNode,vec.elementAt(0));
   } catch (FileNotFoundException e) {
   configMap=null;
   e.printStackTrace();
   } catch (IOException e) {
   configMap=null;
   e.printStackTrace();
   } finally {
   vec.clear();
   bufferedReader.close();
   fileReader.close();
   }
   }
   String nodeKey=”["+%%2+"]“;
   Properties ht=(Properties)configMap.get(nodeKey);
   //”ht:”+ht.toString()
   //”key:”+%%3
   CString %%4=null;
   if(ht.containsKey(%%3)) {
   try {
   %%4=ht.getProperty(%%3);
   } catch (NullPointException e) {
   e.printStackTrace();
   }
   }

   33.合并一个文件下所有的文件
   File combinefiles=new File(%%1);
   File[] files=combinefiles.listFiles();
   FileOutputStream fs;
   try {
   fs=new FileOutputStream(new File(%%2));
   }
   catch(IOException e){
   e.printStackTrace();
   }
   for(int i=0;i<files.length;i++){
   if(files[i].isFile()){
   int bytesum=0;
   int byteread=0;
   try {
   FileInputStream inStream=new FileInputStream(files[i]);
   byte[] buffer = new byte[5120];
   int length;
   while((byteread=inStream.read(buffer))!=-1){
   bytesum+=byteread;
   fs.write(buffer,0,byteread);
   }
   inStream.close();
   }
   catch(Exception e){
   //复制文件出错
   e.printStackTrace();
   }
   }
   }
   try {
   fs.close();
   }
   catch(IOException e){
   {
   e.printStackTrace();
   }

   34.写入ini文件属性
   //import java.io.*
   //import java.util.*;
   //import java.util.regex.*;
   //private HashMap configMap=null;
   private Map configMap=null;
   if(configMap==null) {
   String strLine=null;
   String currentNode=null;
   String previousNode=null;
   Vector vec=new Vector();
   int row=0;
   FileReader fileReader = new FileReader(%%1);
   BufferedReader bufferedReader=new BufferedReader(fileReader);
   try {
   while((strLine=bufferedReader.readLine())!=null) {
   String oneLine=strLine.trim();
   if(oneLine.length()>=1) {
   Pattern p=Pattern.compile(“\\[\\s*.*\\s*\\]“);
   int nodelen=oneLine.split(“[;]“).length;
   String[] strArray1=new String[4];
   if(nodelen==1) {
   oneLine=oneLine.split(“[;]“)[0].trim();
   }
   else if(nodelen==2) {
   strArray1[3]=oneLine.split(“[;]“)[1].trim();
   oneLine=oneLine.split(“[;]“)[0].trim();
   }
   Matcher m=p.matche(oneLine);
   if(m.matches()) {
   strArray1[0]=”@Node”;
   strArray1[1]=oneLine;
   strArray1[2]=”";
   } else {
   int keylen=oneLine.split(“=”).length;
   if(keylen==1) {
   strArray1[0]=”@Key”;
   strArray1[1]=oneLine.split(“=”)[0];
   strArray1[2]=”";
   } else if(kenlen==2) {
   strArray1[0]=”@Key”;
   strArray1[1]=oneLine.split(“=”)[0];
   strArray1[2]=oneLine.split(“=”)[1];
   } else {
   strArray1[0]=”@ElementError”;
   strArray1[1]=”";
   strArray1[2]=”";
   strArray1[3]=”";
   }
   }
   if(strArray1[0].equals(“@Node”)) {
   previousNode=currentNode;
   currentNode=strArray1[1];
   if(row>0) {
   configMap.put(previousNode,vec.elementAt(0));
   //”size:”+configMap.size()
   vec.clear();
   row=0;
   }
   } else if(strArray1[0].equals(“@Key”) && row==0) {
   Properties ht=new Properties();
   ht.setProperty(strArray1[1],strArray1[2]);
   vec.add(0,ht);
   row++;
   }
   } else if(strArray1[0].equals(“@Key”) && row>0) {
   Properties ht2=new Properties();
   ht2.put(strArray1[1],strArray1[2]);
   vec.clear();
   vec.add(0,ht2);
   row++;
   }
   }
   }
   configMap.put(currentNode,vec.elementAt(0));
   } catch (FileNotFoundException e) {
   configMap=null;
   e.printStackTrace();
   } catch (IOException e) {
   configMap=null;
   e.printStackTrace();
   } finally {
   vec.clear();
   bufferedReader.close();
   fileReader.close();
   }
   }
   String nodeKey=”["+%%2+"]“;
   Properties ht=null;
   if(configMap.containsKey(nodeKey)) {
   ht=(Properties)configMap.get(nodeKey);
   } else {
   ht=(Properties)configMap.get(nodeKey,%%3);
   }
   try {
   ht.setProperty(%%3,%%4);
   } catch (NullPointException e) {
   e.printStackTrace();
   }
   FileWriter fw = new FileWriter(%%1);
   BufferedWriter bw=new BufferedWriter(fw);
   Set keys=configMap.keySet();
   Iterator ite=keys.iterator();
   while(ite.hasNext()) {
   String oneKey=(String)ite.next();
   bw.WriteLine(oneKey);
   ht=(Properties)configMap.get(oneKey);
   ht.list(new PrintWriter(bw,true));
   }

   35.获得当前路径
   this.getClass().getResource(“/”).getPath()
6. hias_asia 说：

   2009 年 4 月 11 日下午 10:37

   36.读取XML数据库
   //import java.io.*;
   //import javax.xml.parsers.*;
   //import org.xml.sax.*;
   //import org.w3c.dom.*;
   private Document document;
   File xml_file=new File(%%1);
   DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
   try {
   DocumentBuilder builder=factory.newDocumentBuilder();
   document=builder.parse(xml_file);
   } catch(Exception e) {
   e.printStackTrace();
   }
   String subNodeTag=%%2;
   Element rootNode=document.getDocumentElement();
   //%%2=”serverList” //%%4=”id” //%%6=”port”
   //%%3=”server”  //%%5=”ipaddr”
   NodeList nlist=rootNode.getElementsByTagName(subNodeTag);
   int len=nlist.getLength();
   Node x=null;
   for(int i=0;i<len;i++) {
   x=nlist.item(i);
   String getNodeAttrValue=null;
   NamedNodeMap attrList=node.getAttributes();
   for(int j=0;j<attrList.getLength();j++) {
   if(attrList.item(j).getNodeName().compareTo(%%7)==0) {
   getNodeAttrValue=attrList.item(j).getNodeValue();
   break;
   }
   }
   if(getNodeAttrValue.compareTo(%%8)==0)
   break;
   }
   String %%9=null;
   if(x!=null) {
   NodeList nlist=node.getChildNodes();
   int len=nlist.getLength();
   Node currentNode;
   String nodeName;
   for(int i=0;i<len;i++) {
   currentNode=nlist.item(i);
   nodeName=currentNode.getNodeName();
   if(nodeName.equals(%%5)==0) {
   %%9=document.getElementValue(currentNode);
   break;
   }
   }
   }

   37.写入XML数据库
   //import java.io.*;
   //import javax.xml.parsers.*;
   //import org.xml.sax.*;
   //import org.w3c.dom.*;
   //import javax.xml.transform.*;
   //import javax.xml.transform.dom.*;
   //import javax.xml.transform.stream.*;
   private Document document;
   private Element node;
   File xml_file=new File(%%1);
   DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
   try {
   DocumentBuilder builder=factory.newDocumentBuilder();
   document=builder.parse(xml_file);
   } catch(Exception e) {
   e.printStackTrace();
   }
   String subNodeTag=%%2;
   Element rootNode=document.getDocumentElement();
   //%%2=”serverList” //%%4=”id” //%%6=”port”
   //%%3=”server”  //%%5=”ipaddr”
   NodeList nlist=rootNode.getElementByTagName(subNodeTag);
   node=document.createElement(%%3);
   node.setAttribute(%%4,nlist.getLength()+1).toString());
   node.appendChild(document.createTextNode(“\n”);
   Element ipNode=document.createElement(%%5);
   ipNode.appendChild(document.createTextNode(%%8));
   node.appendChild(ipNode);
   node.appendChild(document,createTextNode(“\n”);
   Element port=document.createElement(%%6);
   port.appendChild(document.createTextNode(%%9));
   node.appendChild(port);
   node.appendChild(document,createTextNode(“\n”);
   nlist.appendChild(node);
   TransformerFactory tFactory=TransformerFactory.newInstance();
   Transformer transformer=null;
   try {
   transformer=tFactory.newTransformer();
   DOMSource source=new DOMSource(document);
   StreamResult result=new StreamResult(xml_file);
   transformer.transform(source,result);
   } catch(Exception e) {
   e.printStackTrace();
   }

   38.ZIP压缩文件
   //import java.io.*;
   //import java.util.zip.*;
    //创建文件输入流对象
    FileInputStream fis=new FileInputStream(%%1);
    //创建文件输出流对象
    FileOutputStream fos=new FileOutputStream(%%2);
    //创建ZIP数据输出流对象
    ZipOutputStream zipOut=new ZipOutputStream(fos);
    //创建指向压缩原始文件的入口
    ZipEntry entry=new ZipEntry(args[0]);
    zipOut.putNextEntry(entry);
    //向压缩文件中输出数据
    int nNumber;
    byte[] buffer=new byte[1024];
    while((nNumber=fis.read(buffer))!=-1)
   zipOut.write(buffer,0,nNumber);
    //关闭创建的流对象
    zipOut.close();
    fos.close();
    fis.close();
   }
   catch(IOException e)
   {
    System.out.println(e);
   }

   39.ZIP解压缩
   //import java.io.*;
   //import java.util.zip.*;
   try{
    //创建文件输入流对象实例
    FileInputStream fis=new FileInputStream(%%1);
    //创建ZIP压缩格式输入流对象实例
    ZipInputStream zipin=new ZipInputStream(fis);
    //创建文件输出流对象实例
    FileOutputStream fos=new FileOutputStream(%%2);
    //获取Entry对象实例
    ZipEntry entry=zipin.getNextEntry();
    byte[] buffer=new byte[1024];
    int nNumber;
    while((nNumber=zipin.read(buffer,0,buffer.length))!=-1)
   fos.write(buffer,0,nNumber);
    //关闭文件流对象
    zipin.close();
    fos.close();
    fis.close();
   }
   catch(IOException e) {
    System.out.println(e);
   }

   40.ZIP压缩文件夹
   //import java.io.*;
   //import org.apache.tools.zip.ZipOutputStream; //这个包在ant.jar里，要到官方网下载
   //import java.util.zip.*;
   try {
   String zipFileName = %%2; //打包后文件名字
   File f=new File(%%1);
   ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFileName));
   String base= “”;
   if (f.isDirectory()) {
      File[] fl = f.listFiles();
      out.putNextEntry(new org.apache.tools.zip.ZipEntry(base + “/”));
      base = base.length() == 0 ? “” : base + “/”;
      for (int i = 0; i < fl.length; i++) {
      zip(out, fl[i], base + fl[i].getName());
    }
   }else {
      out.putNextEntry(new org.apache.tools.zip.ZipEntry(base));
      FileInputStream in = new FileInputStream(f);
      int b;
      while ( (b = in.read()) != -1) {
       out.write(b);
    }
   in.close();
   }
   out.close();
   }catch (Exception ex) {
      ex.printStackTrace();
   }
7. hiroki 说：

   2009 年 4 月 20 日下午 6:42

   感谢楼主帖！