我有一个 3MB 和一个 5MB 的文本文件。我想确保较大的文件包含较小文件中的所有行。
输出需要显示较小文件的所有未包含在较大文件中的行。我尝试将它们与 Notepad++ 进行比较，但它挂起了。Word 2007 比较很难理解。
我尝试了 Beyond Compare、WinMerge、fc 等。两个文件中的行顺序不同 - 因此比较工具说行不同，但大文件中的同一行位于不同位置。想想小文件是这样的 -
abc def
ghi jkl
mno pqr
yza bcd
想想大文件是这样的 -
efg hij
mno pqr
ghi jkl
abc def
stu vwx
我想要输出这个-
yza bcd
答案1
更新：
今天早上我心情大好，所以我把这个给你。应该可以满足你的要求。
一些说明：
1.) 此代码将处理重复项。例如，如果包含相同文本的行在小文件中出现两次，则预计该行也会在大文件中出现两次。
2.)此代码根据您的使用情况忽略行排序。
3.) 关于文件末尾空白行的小错误，我不想弄乱它。此代码将空白行视为与任何其他行一样的行，只要它不在文件末尾即可，在这种情况下允许一个空白行（并忽略）。例如，如果小文件在文件末尾有 3 个空白行，没有其他空白行，那么大文件预计在其他行中间至少有 2 个空白行，或者在文件末尾有 3 个空白行。
跑步：
1.）确保你有一个JDK已安装
2.) 确保 java 在您的路径中。如果您使用的是 Windows 系统，请转到控制面板 > 系统 > 高级系统设置 > 环境变量，然后选择Path系统变量部分。将 JDK bin 文件夹的位置附加到路径变量中，确保用分号将其与上一个条目分开。如下所示：
C:\Program Files (x86)\Java\jdk1.6.0_38\bin;
3.）将以下代码复制到名为FileLineComparator.java
4.) 打开命令提示符并导航到刚刚创建的文件的目录
5.）类型javac FileLineComparator.java
6.）类型java -cp . FileLineComparator
7.）享受吧！
import java.io.*;
import java.util.ArrayList;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
public class FileLineComparator extends javax.swing.JFrame {
public FileLineComparator() {
initComponents();
}
@SuppressWarnings( "unchecked" )
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
fileChooser = new javax.swing.JFileChooser();
smallFileTextField = new javax.swing.JTextField();
smallFileLabel = new javax.swing.JLabel();
largeFileLabel = new javax.swing.JLabel();
largeFileTextField = new javax.swing.JTextField();
outputFileLabel = new javax.swing.JLabel();
outputFileTextField = new javax.swing.JTextField();
goButton = new javax.swing.JButton();
smallFileButton = new javax.swing.JButton();
largeFileButton = new javax.swing.JButton();
outputFileButton = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
smallFileLabel.setText("Small text file:");
largeFileLabel.setText("Large text file:");
outputFileLabel.setText("Output file:");
goButton.setText("Go!");
goButton.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
goButtonMouseClicked(evt);
}
});
smallFileButton.setText("Browse");
smallFileButton.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
smallFileButtonMouseClicked(evt);
}
});
largeFileButton.setText("Browse");
largeFileButton.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
largeFileButtonMouseClicked(evt);
}
});
outputFileButton.setText("Browse");
outputFileButton.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
outputFileButtonMouseClicked(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(largeFileLabel)
.addComponent(smallFileLabel))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(outputFileTextField, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 194, Short.MAX_VALUE)
.addComponent(largeFileTextField, javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(smallFileTextField)))
.addComponent(outputFileLabel))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(largeFileButton)
.addComponent(smallFileButton)
.addComponent(outputFileButton)))
.addComponent(goButton, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addContainerGap(16, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(smallFileTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(smallFileLabel)
.addComponent(smallFileButton))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(largeFileLabel)
.addComponent(largeFileTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(largeFileButton))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(outputFileTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(outputFileLabel)
.addComponent(outputFileButton))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(goButton, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void smallFileButtonMouseClicked( java.awt.event.MouseEvent evt ) {
setSelectedFile( FILE_TYPES.SMALL );
}
private void largeFileButtonMouseClicked( java.awt.event.MouseEvent evt ) {
setSelectedFile( FILE_TYPES.LARGE );
}
private void outputFileButtonMouseClicked( java.awt.event.MouseEvent evt ) {
setSelectedFile( FILE_TYPES.OUTPUT );
}
private void goButtonMouseClicked( java.awt.event.MouseEvent evt ) {
errorStub = new StringBuilder();
smallFile = new File( smallFileTextField.getText() );
smallFileTextField.setText( smallFile.getAbsolutePath() );
largeFile = new File( largeFileTextField.getText() );
largeFileTextField.setText( largeFile.getAbsolutePath() );
outputFile = new File( outputFileTextField.getText() );
outputFileTextField.setText( outputFile.getAbsolutePath() );
process();
}
private void setSelectedFile( FILE_TYPES fileType ) {
int returnVal = fileChooser.showOpenDialog( null );
if( returnVal == JFileChooser.APPROVE_OPTION ) {
File file = fileChooser.getSelectedFile();
switch( fileType ) {
case SMALL:
smallFileTextField.setText( file.getPath() );
break;
case LARGE:
largeFileTextField.setText( file.getPath() );
break;
case OUTPUT:
outputFileTextField.setText( file.getPath() );
break;
}
}
}
private void process() {
ArrayList<String> smallFileLines = readFileLines( smallFile );
ArrayList<String> largeFileLines = readFileLines( largeFile );
ArrayList<String> outputFileLines = new ArrayList<String>();
for( String line : smallFileLines ) {
if( !largeFileLines.contains( line ) ) {
outputFileLines.add( line );
} else {
largeFileLines.remove( line );
}
}
if( errorStub.length() == 0 ) {
writeOutput( outputFileLines );
}
if( errorStub.length() == 0 ) {
JOptionPane.showMessageDialog( null, "Finished Successfully!" );
} else {
JOptionPane.showMessageDialog( null, errorStub.toString() );
}
}
private ArrayList<String> readFileLines( File file ) {
ArrayList<String> al = new ArrayList<String>();
try {
FileReader fr = new FileReader( file );
BufferedReader bufRdr = new BufferedReader( fr );
String line = null;
while( ( line = bufRdr.readLine() ) != null ) {
al.add( line );
}
bufRdr.close();
} catch( IOException ioex ) {
errorStub.append( String.format( "Error reading file %s\r\n", file.getAbsolutePath() ) );
System.err.println( ioex.getMessage() );
}
return al;
}
private void writeOutput( ArrayList<String> outputFileLines ) {
try {
FileWriter fw = new FileWriter( outputFile );
BufferedWriter bw = new BufferedWriter( fw );
for( int i = 0; i < outputFileLines.size(); i++ ) {
String line = String.format( "%s%s", outputFileLines.get( i ), i + 1 == outputFileLines.size() ? "" : "\r\n" );
bw.write( line );
}
bw.close();
} catch( Exception ex ) {
errorStub.append( String.format( "Error writing file %s\r\n", outputFile.getAbsolutePath() ) );
System.err.println( ex.getMessage() );
}
}
public static void main( String args[] ) {
try {
for( javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels() ) {
if( "Nimbus".equals( info.getName() ) ) {
javax.swing.UIManager.setLookAndFeel( info.getClassName() );
break;
}
}
} catch( ClassNotFoundException ex ) {
java.util.logging.Logger.getLogger( FileLineComparator.class.getName() ).log( java.util.logging.Level.SEVERE, null, ex );
} catch( InstantiationException ex ) {
java.util.logging.Logger.getLogger( FileLineComparator.class.getName() ).log( java.util.logging.Level.SEVERE, null, ex );
} catch( IllegalAccessException ex ) {
java.util.logging.Logger.getLogger( FileLineComparator.class.getName() ).log( java.util.logging.Level.SEVERE, null, ex );
} catch( javax.swing.UnsupportedLookAndFeelException ex ) {
java.util.logging.Logger.getLogger( FileLineComparator.class.getName() ).log( java.util.logging.Level.SEVERE, null, ex );
}
java.awt.EventQueue.invokeLater( new Runnable() {
public void run() {
new FileLineComparator().setVisible( true );
}
} );
}
private enum FILE_TYPES {
SMALL,
LARGE,
OUTPUT
}
private File smallFile = null;
private File largeFile = null;
private File outputFile = null;
private StringBuilder errorStub = null;
// Variables declaration - do not modify
private javax.swing.JFileChooser fileChooser;
private javax.swing.JButton goButton;
private javax.swing.JButton largeFileButton;
private javax.swing.JLabel largeFileLabel;
private javax.swing.JTextField largeFileTextField;
private javax.swing.JButton outputFileButton;
private javax.swing.JLabel outputFileLabel;
private javax.swing.JTextField outputFileTextField;
private javax.swing.JButton smallFileButton;
private javax.swing.JLabel smallFileLabel;
private javax.swing.JTextField smallFileTextField;
// End of variables declaration
}
答案2
合并非常适合比较文本文件。