Search for multiline String in a text file

Janny :

I have a text file from which i am trying to search for a String which has multiple lines. A single string i am able to search but i need multi line string to be searched.

I have tried to search for single line which is working fine.

public static void main(String[] args) throws IOException 
{
  File f1=new File("D:\\Test\\test.txt"); 
  String[] words=null;  
  FileReader fr = new FileReader(f1);  
  BufferedReader br = new BufferedReader(fr); 
  String s;     
  String input="line one"; 

  // here i want to search for multilines as single string like 
  //   String input ="line one"+
  //                 "line two";

  int count=0;   
  while((s=br.readLine())!=null)   
  {
    words=s.split("\n");  
    for (String word : words) 
    {
      if (word.equals(input))   
      {
        count++;    
      }
    }
  }

  if(count!=0) 
  {
    System.out.println("The given String "+input+ " is present for "+count+ " times ");
  }
  else
  {
    System.out.println("The given word is not present in the file");
  }
  fr.close();
}

And below are the file contents.

line one  
line two  
line three  
line four

Deadpool :

Use the StringBuilder for that, read every line from file and append them to StringBuilder with lineSeparator

StringBuilder lineInFile = new StringBuilder();

while((s=br.readLine()) != null){
  lineInFile.append(s).append(System.lineSeparator());
}

Now check the searchString in lineInFile by using contains

StringBuilder searchString = new StringBuilder();

builder1.append("line one");
builder1.append(System.lineSeparator());
builder1.append("line two");

System.out.println(lineInFile.toString().contains(searchString));