JAVA文件操作大全（1）

亦凉 2022-07-21 12:17 177阅读 0赞

JAVA文件操作大全 收藏   
1.创建文件夹

File myFolderPath = new File(%%1);   
try \{   
if (!myFolderPath.exists()) \{   
     myFolderPath.mkdir();   
\}   
\}   
catch (Exception e) \{   
System.out.println("新建目录操作出错");   
e.printStackTrace();   
\}     
  
2.创建文件   
File myFilePath = new File(%%1);   
try \{   
if (!myFilePath.exists()) \{   
myFilePath.createNewFile();   
\}   
FileWriter resultFile = new FileWriter(myFilePath);   
PrintWriter myFile = new PrintWriter(resultFile);   
myFile.println(%%2);   
resultFile.close();   
\}   
catch (Exception e) \{   
System.out.println("新建文件操作出错");   
e.printStackTrace();   
\}     
  
3.删除文件   
File myDelFile = new File(%%1);   
try \{   
myDelFile.delete();   
\}   
catch (Exception e) \{   
System.out.println("删除文件操作出错");   
e.printStackTrace();   
\}     
  
4.删除文件夹   
File delFolderPath = new File(%%1);   
try \{   
delFolderPath.delete(); //删除空文件夹   
\}   
catch (Exception e) \{   
System.out.println("删除文件夹操作出错");   
e.printStackTrace();   
\}     
  
5.删除一个文件下夹所有的文件夹   
File delfile=new File(%%1);   
File\[\] files=delfile.listFiles();   
for(int i=0;i<files.length;i++)\{   
if(files\[i\].isDirectory())\{   
files\[i\].delete();   
    \}   
\}     
  
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   
\}     
  
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     
  
//import java.io.\*;   
//import java.util.\*;   
ArrayList<String> folderList = new ArrayList<String>();   
folderList.add(%%1);   
for (int j = 0; j < folderList.size(); j++) \{   
File file = new File(folderList.get(j));   
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\[i\].getPath());   
\} else \{   
fileList.add(files\[i\]);   
\}   
\}   
for (File f : fileList) \{   
%%2=f.toString();   
%%3   
\}   
\}     
  
13.复制文件夹     
//import java.io.\*;   
//import java.util.\*;   
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();   
  
16.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();   
\}   
\}   
  
17.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();   
    \}   
\}     
  
18.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();   
    \}     
  
19.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();   
    \}   
\}   
\}     
  
20.提取扩展名   
String %%2=(new File(%%1)).getName().split(".")\[1\];     
  
21.提取文件名   
String %%2=(new File(%%1)).getName().split("//")\[1\];     
  
22.提取文件路径   
String %%2=(new File(%%1)).getPath();     
  
23.替换扩展名   
File replaceExt=new File(%%1);   
replaceExt.renameTo(replaceExt.getName().split(".")\[0\]+"."+%%2);     
  
24.追加路径   
%%3=%%2+"/"+%%1     
  
25.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();   
    \}     
  
26.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();   
    \}   
\}   
\}     
  
27.指定目录下搜索文件   
    private void doSearch(String filter, String path) \{   
        File file = new File(path);   
        if(file.exists()) \{   
            if(file.isDirectory()) \{   
                File\[\] fileArray = file.listFiles();   
                for(File f:fileArray) \{   
                    if(f.isDirectory()) \{   
                        doSearch(filter,f.getPath());   
                    \} else \{   
                        if(f.getName().indexOf(filter) >= 0) \{   
                            countFiles++;   
                            result.append(f.getPath() + "\\r\\n");   
                        \}   
                    \}   
                    statusShow1.setText(f.getPath());   
                \}   
                statusShow2.setText("The numbers of files had been found:" + countFiles);   
            \} else \{   
                System.out.println("Couldn't open the path!");   
            \}   
        \} else \{   
            System.out.println("The path had been apointed was not Exist!");   
        \}   
    \}     
  
28.打开对话框   
JFileChooser Jfc = new JFileChooser();            //建立选择档案对话方块盒 Jfc   
%%1 = Jfc.getSelectedFile();     
  
29.文件分割   
//import java.io.\*   
try \{   
File f=new File(%%1);   
FileInputStream fileInputStream = new FileInputStream(f);   
byte\[\] buffer = new byte\[fileInputStream.available()\];   
FileInputStream.read(buffer);   
fileInputStream.close();   
String strFileName = f.getName();   
FileOutputStream fileOutputStream = new FileOutputStream(new File(%%2+"\\\\"+ strFileName + "1"));   
fileOutputStream.write(buffer,0,buffer.length/2);   
fileOutputStream.close();   
fileOutputStream = new FileOutputStream(new File(%%2+"\\\\"+ strFileName + "2"));   
fileOutputStream.write(buffer, buffer.length/2, buffer.length-buffer.length/2);   
fileOutputStream.close();   
\} catch (ArrayIndexOutOfBoundsException e) \{   
System.out.print("using FileStreamDemo src des");   
e.printStackTrace();   
\}   
catch(IOException e)\{   
e.printStackTrace();   
\}     
  
30.文件合并   
//import java.io.\*   
String strFileName = %%1.substring(%%1.LastIndexOf("\\\\") + 1);   
try \{   
FileInputStream fileInputStream1 = new FileInputStream(new File(%%2 + strFileName + "1"));   
FileInputStream fileInputStream2 = new FileInputStream(new File(%%2 + strFileName + "2"));   
byte\[\] buffer = new byte\[fileInputStream1.available()+fileInputStream2.available()\];   
FileInputStream.read(buffer, 0, fileInputStream1.available());   
FileInputStream2.read(buffer, fileInputStream1.available(), fileInputStream2.available());   
fileInputStream.close();   
fileInputStream2.close();   
FileOutputStream fileOutputStream = new FileOutputStream(new File(%%2+"\\\\"+ strFileName));   
fileOutputStream.write(buffer,0,buffer.length);   
fileOutputStream.close();   
catch(IOException e)\{   
e.printStackTrace();   
\}

收藏于 2009-10-20