Java：如何打印找到的字符串的下一行

Question

此代碼的工作原理和打印行，但我希望它打印下一行。

import java.io.*; 

public class SearchTextFile { 
    // 
    public static void main(String args[]) throws Exception { 
     int tokencount; 
     FileReader fr = new FileReader("c:\\searchtxt.txt"); 
     BufferedReader br = new BufferedReader(fr); 
     String s; 
     int linecount = 0; 

     String keyword = "something"; 
     String line; 

     while ((s = br.readLine()) != null) { 
      if (s.contains(keyword)) 
       System.out.println(s); 

     } 
    } 
} 

任何幫助將是偉大的！

Answer 1

你應該修改這部分代碼：

while ((s=br.readLine())!=null) { 
    if(s.contains(keyword)) 
     System.out.println(s); 
} 

在這裏你正在打印包含關鍵字的行。既然您想要打印下一行，請使用BufferedReader在if條件內再次讀取下一行。因此，它會是這樣的：

while ((s=br.readLine())!=null) { 
    if(s.contains(keyword)) { 
     //System.out.println(s); 
     String nextLine = br.readLine(); 
     System.out.println(nextLine); 
    } 
} 

Answer 2

要打印keyword後線找到我會做一些簡單的像這樣：

boolean foundString = false; 
while ((s = br.readLine()) != null) { 
    if (s.contains(keyword)) { 
     System.out.println(s); 
     foundString = true; 
    } else if (foundString) { 
     System.out.println(s); 
     foundString = false; 
    } 
} 

Answer 3

if(s.contains(keyword)) 
    System.out.println(br.readline()); 

Answer 4

boolean isFound = false; 
    String line = null; 


    while (line = br.readline() != null){ 
     if(isFound){ 
      System.out.print(line) 
      isFound = false; 
     } 

     if(line.contains(keyword)){ 
      isFound = true; 
     } 

    }