使用Java查找并替换多个文本文件中的单词？

Question

如何使用Java在几个文本文件中查找和替换单词？

这里是我如何做到这一点的一个String ...

public class ReplaceAll { 

    public static void main(String[] args) { 
     String str = "We want replace replace word from this string"; 
     str = str.replaceAll("replace", "Done"); 
     System.out.println(str); 
    } 
} 

Answer 1

运用Commons IOFileUtils：

String[] files = { "file1.txt", "file2.txt", "file3.txt" }; 
for (String file : files) { 
    File f = new File(file); 
    String content = FileUtils.readFileToString(new File("filename.txt")); 
    FileUtils.writeStringToFile(f, content.replaceAll("hello", "world")); 
} 

Answer 2

您可以使用的FileReader由一个BufferedReader包裹，通过线拉出符合该文件中读取后，对相同的替换您在问题中显示的字符串，并将其写回新文件。

Answer 3

这是工作代码：希望它能帮助！

import java.io.*; 
import java.util.Scanner; 
import java.util.StringTokenizer; 


public class TestIO { 

static StringBuilder sbword = new StringBuilder(); 
static String dirname = null; 
static File[] filenames = null; 
static Scanner sc = new Scanner(System.in); 

public static void main(String args[]) throws FileNotFoundException, IOException{ 
    boolean fileread = ReadFiles(); 

    sbword = null; 
    System.exit(0); 



} 
private static boolean ReadFiles() throws FileNotFoundException, IOException{ 

    System.out.println("Enter the location of folder:"); 


    File file = new File(sc.nextLine()); 
    filenames = file.listFiles(); 
    String line = null; 

    for(File file1 : filenames){ 
    System.out.println("File name" + file1.toString()); 
    sbword.setLength(0); 
    BufferedReader br = new BufferedReader(new FileReader(file1)); 

    line = br.readLine(); 

    while(line != null){ 
     System.out.println(line); 
     sbword.append(line).append("\r\n"); 
     line = br.readLine(); 
     } 

    ReplaceLines(); 
    WriteToFile(file1.toString()); 

    } 

    return true;  
} 

private static void ReplaceLines(){ 
    System.out.println("sbword contains :" + sbword.toString()); 
    System.out.println("Enter the word to replace from each of the files:"); 
    String from = sc.nextLine(); 
    System.out.println("Enter the new word"); 
    String To = sc.nextLine(); 

    //StringBuilder sbword = new StringBuilder(stbuff); 
    ReplaceAll(sbword,from,To); 



} 
private static void ReplaceAll(StringBuilder builder, String from, String to){ 
    int index = builder.indexOf(from); 
    while(index != -1){ 
     builder.replace(index, index + from.length(), to); 
     index += to.length(); 
     index = builder.indexOf(from,index); 
    } 
} 
private static void WriteToFile(String filename) throws IOException{ 
    try{ 
    File file1 = new File(filename); 
    BufferedWriter bufwriter = new BufferedWriter(new FileWriter(file1)); 
    bufwriter.write(sbword.toString()); 
    bufwriter.close(); 

    }catch(Exception e){ 
     System.out.println("Error occured while attempting to write to file: " +  e.getMessage()); 
    } 

} 

}