一、Java文件操作代码
[来源]http://uujava0322.iteye.com/blog/1045876
1 //1.创建文件夹 2 //import java.io.*; 3 File myFolderPath = new File(str1); 4 try { 5 if (!myFolderPath.exists()) { 6 myFolderPath.mkdir(); 7 } 8 } 9 catch (Exception e) { 10 System.out.println("新建目录操作出错"); 11 e.printStackTrace(); 12 } 13 14 //2.创建文件 15 //import java.io.*; 16 File myFilePath = new File(str1); 17 try { 18 if (!myFilePath.exists()) { 19 myFilePath.createNewFile(); 20 } 21 FileWriter resultFile = new FileWriter(myFilePath); 22 PrintWriter myFile = new PrintWriter(resultFile); 23 myFile.println(str2); 24 resultFile.close(); 25 } 26 catch (Exception e) { 27 System.out.println("新建文件操作出错"); 28 e.printStackTrace(); 29 } 30 31 //3.删除文件 32 //import java.io.*; 33 File myDelFile = new File(str1); 34 try { 35 myDelFile.delete(); 36 } 37 catch (Exception e) { 38 System.out.println("删除文件操作出错"); 39 e.printStackTrace(); 40 } 41 42 //4.删除文件夹 43 //import java.io.*; 44 File delFolderPath = new File(str1); 45 try { 46 delFolderPath.delete(); //删除空文件夹 47 } 48 catch (Exception e) { 49 System.out.println("删除文件夹操作出错"); 50 e.printStackTrace(); 51 } 52 53 //5.删除一个文件下夹所有的文件夹 54 //import java.io.*; 55 File delfile=new File(str1); 56 File[] files=delfile.listFiles(); 57 for(int i=0;ifolderList = new LinkedList (); 153 folderList.add(str1); 154 while (folderList.size() > 0) { 155 File file = new File(folderList.peek()); 156 folderList.removeLast(); 157 File[] files = file.listFiles(); 158 ArrayList fileList = new ArrayList (); 159 for (int i = 0; i < files.length; i++) { 160 if (files[i].isDirectory()) { 161 folderList.add(files[i].getPath()); 162 } else { 163 fileList.add(files[i]); 164 } 165 } 166 for (File f : fileList) { 167 str2=f.getAbsoluteFile(); 168 str3 169 } 170 } 171 172 //13.复制文件夹 173 //import java.io.*; 174 //import java.util.*; 175 LinkedList folderList = new LinkedList (); 176 folderList.add(str1); 177 LinkedList folderList2 = new LinkedList (); 178 folderList2.add(str2+ str1.substring(str1.lastIndexOf("\\"))); 179 while (folderList.size() > 0) { 180 (new File(folderList2.peek())).mkdirs(); // 如果文件夹不存在 则建立新文件夹 181 File folders = new File(folderList.peek()); 182 String[] file = folders.list(); 183 File temp = null; 184 try { 185 for (int i = 0; i < file.length; i++) { 186 if (folderList.peek().endsWith(File.separator)) { 187 temp = new File(folderList.peek() + File.separator 188 + file[i]); 189 } else { 190 temp = new File(folderList.peek() + File.separator + file[i]); 191 } 192 if (temp.isFile()) { 193 FileInputStream input = new FileInputStream(temp); 194 FileOutputStream output = new FileOutputStream( 195 folderList2.peek() + File.separator + (temp.getName()).toString()); 196 byte[] b = new byte[5120]; 197 int len; 198 while ((len = input.read(b)) != -1) { 199 output.write(b, 0, len); 200 } 201 output.flush(); 202 output.close(); 203 input.close(); 204 } 205 if (temp.isDirectory()) { // 如果是子文件夹 206 for (File f : temp.listFiles()) { 207 if (f.isDirectory()) { 208 folderList.add(f.getPath()); 209 folderList2.add(folderList2.peek() 210 + File.separator + f.getName()); 211 } 212 } 213 } 214 } 215 } catch (Exception e) { 216 //System.out.println("复制整个文件夹内容操作出错"); 217 e.printStackTrace(); 218 } 219 folderList.removeFirst(); 220 folderList2.removeFirst(); 221 } 222 223 //14.复制一个文件夹下所有的文件夹到另一个文件夹下 224 //import java.io.*; 225 //import java.util.*; 226 File copyfolders=new File(str1); 227 File[] copyfoldersList=copyfolders.listFiles(); 228 for(int k=0;k folderList=new ArrayList (); 231 folderList.add(copyfoldersList[k].getPath()); 232 ArrayList folderList2=new ArrayList (); 233 folderList2.add(str2+"/"+copyfoldersList[k].getName()); 234 for(int j=0;j folderList = new LinkedList (); 277 folderList.add(str1); 278 LinkedList folderList2 = new LinkedList (); 279 folderList2.add(str2 + str1.substring(str1.lastIndexOf("\\"))); 280 while (folderList.size() > 0) { 281 (new File(folderList2.peek())).mkdirs(); // 如果文件夹不存在 则建立新文件夹 282 File folders = new File(folderList.peek()); 283 String[] file = folders.list(); 284 File temp = null; 285 try { 286 for (int i = 0; i < file.length; i++) { 287 if (folderList.peek().endsWith(File.separator)) { 288 temp = new File(folderList.peek() + File.separator + file[i]); 289 } else { 290 temp = new File(folderList.peek() + File.separator + file[i]); 291 } 292 if (temp.isFile()) { 293 FileInputStream input = new FileInputStream(temp); 294 FileOutputStream output = new FileOutputStream( 295 folderList2.peek() + File.separator + (temp.getName()).toString()); 296 byte[] b = new byte[5120]; 297 int len; 298 while ((len = input.read(b)) != -1) { 299 output.write(b, 0, len); 300 } 301 output.flush(); 302 output.close(); 303 input.close(); 304 if (!temp.delete()) 305 System.out.println("删除单个文件操作出错!"); 306 } 307 if (temp.isDirectory()) { // 如果是子文件夹 308 for (File f : temp.listFiles()) { 309 if (f.isDirectory()) { 310 folderList.add(f.getPath()); 311 folderList2.add(folderList2.peek() + File.separator + f.getName()); 312 } 313 } 314 } 315 } 316 } catch (Exception e) { 317 // System.out.println("复制整个文件夹内容操作出错"); 318 e.printStackTrace(); 319 } 320 folderList.removeFirst(); 321 folderList2.removeFirst(); 322 } 323 File f = new File(str1); 324 if (!f.delete()) { 325 for (File file : f.listFiles()) { 326 if (file.list().length == 0) { 327 System.out.println(file.getPath()); 328 file.delete(); 329 } 330 } 331 } 332 //16.移动一个文件夹下所有的文件夹到另一个目录下 333 //import java.io.*; 334 //import java.util.*; 335 File movefolders=new File(str1); 336 File[] movefoldersList=movefolders.listFiles(); 337 for(int k=0;k folderList=new ArrayList (); 340 folderList.add(movefoldersList[k].getPath()); 341 ArrayList folderList2=new ArrayList (); 342 folderList2.add(str2+"/"+movefoldersList[k].getName()); 343 for(int j=0;j folderList=new ArrayList (); 390 folderList.add(str1); 391 ArrayList folderList2=new ArrayList (); 392 folderList2.add(str2); 393 for(int j=0;j
二、Java文件读写操作代码
[来源]http://www.cnblogs.com/zhuocheng/archive/2011/12/12/2285290.html
一.获得控制台用户输入的信息
public String getInputMessage() throws IOException...{ System.out.println("请输入您的命令∶"); byte buffer[]=new byte[1024]; int count=System.in.read(buffer); char[] ch=new char[count-2];//最后两位为结束符,删去不要 for(int i=0;i<count-2;i++) ch[i]=(char)buffer[i]; String str=new String(ch); return str; } 可以返回用户输入的信息,不足之处在于不支持中文输入,有待进一步改进。二.复制文件
1.以文件流的方式复制文件 public void copyFile(String src,String dest) throws IOException...{ FileInputStream in=new FileInputStream(src); File file=new File(dest); if(!file.exists()) file.createNewFile(); FileOutputStream out=new FileOutputStream(file); int c; byte buffer[]=new byte[1024]; while((c=in.read(buffer))!=-1)...{ for(int i=0;i<c;i++) out.write(buffer[i]); } in.close(); out.close(); } 该方法经过测试,支持中文处理,并且可以复制多种类型,比如txt,xml,jpg,doc等多种格式三.写文件
1.利用PrintStream写文件
public void PrintStreamDemo()...{ try ...{ FileOutputStream out=new FileOutputStream("D:/test.txt"); PrintStream p=new PrintStream(out); for(int i=0;i<10;i++) p.println("This is "+i+" line"); } catch (FileNotFoundException e) ...{ e.printStackTrace(); } } 2.利用StringBuffer写文件public void StringBufferDemo() throws IOException......{ File file=new File("/root/sms.log"); if(!file.exists()) file.createNewFile(); FileOutputStream out=new FileOutputStream(file,true); for(int i=0;i<10000;i++)......{ StringBuffer sb=new StringBuffer(); sb.append("这是第"+i+"行:前面介绍的各种方法都不关用,为什么总是奇怪的问题 "); out.write(sb.toString().getBytes("utf-8")); } out.close(); } 该方法可以设定使用何种编码,有效解决中文问题。四.文件重命名 public void renameFile(String path,String oldname,String newname)...{ if(!oldname.equals(newname))...{//新的文件名和以前文件名不同时,才有必要进行重命名 File oldfile=new File(path+"/"+oldname); File newfile=new File(path+"/"+newname); if(newfile.exists())//若在该目录下已经有一个文件和新文件名相同,则不允许重命名 System.out.println(newname+"已经存在!"); else...{ oldfile.renameTo(newfile); } } }五.转移文件目录
转移文件目录不等同于复制文件,复制文件是复制后两个目录都存在该文件,而转移文件目录则是转移后,只有新目录中存在该文件。 public void changeDirectory(String filename,String oldpath,String newpath,boolean cover)...{ if(!oldpath.equals(newpath))...{ File oldfile=new File(oldpath+"/"+filename); File newfile=new File(newpath+"/"+filename); if(newfile.exists())...{//若在待转移目录下,已经存在待转移文件 if(cover)//覆盖 oldfile.renameTo(newfile); else System.out.println("在新目录下已经存在:"+filename); } else...{ oldfile.renameTo(newfile); } } } 六.读文件 1.利用FileInputStream读取文件 public String FileInputStreamDemo(String path) throws IOException...{ File file=new File(path); if(!file.exists()||file.isDirectory()) throw new FileNotFoundException(); FileInputStream fis=new FileInputStream(file); byte[] buf = new byte[1024]; StringBuffer sb=new StringBuffer(); while((fis.read(buf))!=-1)...{ sb.append(new String(buf)); buf=new byte[1024];//重新生成,避免和上次读取的数据重复 } return sb.toString(); }2.利用BufferedReader读取在IO操作,利用BufferedReader和BufferedWriter效率会更高一点
public String BufferedReaderDemo(String path) throws IOException...{ File file=new File(path); if(!file.exists()||file.isDirectory()) throw new FileNotFoundException(); BufferedReader br=new BufferedReader(new FileReader(file)); String temp=null; StringBuffer sb=new StringBuffer(); temp=br.readLine(); while(temp!=null)...{ sb.append(temp+" "); temp=br.readLine(); } return sb.toString(); } 3.利用dom4j读取xml文件public Document readXml(String path) throws DocumentException, IOException...{ File file=new File(path); BufferedReader bufferedreader = new BufferedReader(new FileReader(file)); SAXReader saxreader = new SAXReader(); Document document = (Document)saxreader.read(bufferedreader); bufferedreader.close(); return document; } 七.创建文件(文件夹) 1.创建文件夹 public void createDir(String path)...{ File dir=new File(path); if(!dir.exists()) dir.mkdir(); }2.创建新文件 public void createFile(String path,String filename) throws IOException...{ File file=new File(path+"/"+filename); if(!file.exists()) file.createNewFile(); } 八.删除文件(目录)1.删除文件 public void delFile(String path,String filename)...{ File file=new File(path+"/"+filename); if(file.exists()&&file.isFile()) file.delete(); }2.删除目录要利用File类的delete()方法删除目录时,必须保证该目录下没有文件或者子目录,否则删除失败,因此在实际应用中,我们要删除目录,必须利用递归删除该目录下的所有子目录和文件,然后再删除该目录。 public void delDir(String path)...{ File dir=new File(path); if(dir.exists())...{ File[] tmp=dir.listFiles(); for(int i=0;i<tmp.length;i++)...{ if(tmp[i].isDirectory())...{ delDir(path+"/"+tmp[i].getName()); } else...{ tmp[i].delete(); } } dir.delete(); } }