CODEWITHSUNDEEP
java
Neo-coder
Neo-coder

Reputation: 7840

Java file reading and converting using regular expression

Hi I have text file which contain given below 

 PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
23876 root      20   0  9436 1764  760 R    4  0.0   0:00.08 top                
50741 hcsadm    20   0 18.0g 2.3g 751m S    4  0.4   1310:10 hdbnameserver      
51089 hcsadm    20   0 55.0g  48g  23g S    4  9.5   4713:14 hdbindexserver     
15618 gdm       20   0  273m  65m  11m S    2  0.0 162:17.68 gdm-simple-gree    
15938 cisadm    20   0  687m 281m 267m S    2  0.1 306:55.97 hdb.sapCIS_HDB0    
17645 hbsadm    20   0 18.1g 7.7g 598m S    2  1.5 974:48.98 hdbnameserver      
17795 hbsadm    20   0  109g 104g  39g S    2 20.8  14496:26 hdbindexserver

and my java code reading file as given below

 Scanner sc = new Scanner(new File("top.txt"));
 while(sc.hasNext()){
  String line = sc.nextLine();       
 }

Now any one knows how to I translate file data in following format

array=[{PID:23876,USER:root,COMMAND:top},{PID:50741,USER:hcsadm,COMMAND:hdbnameserver},..........]

How I used regular expression in java so I convert my file info in above format or there are any other options in java to make above array.

Upvotes: 3

Views: 853

Answers (2)

Nir Alfasi
Nir Alfasi

Reputation: 53525

Try:

while(sc.hasNext()){
  String line = sc.nextLine();       
  String[] values = line.split("\\s+");
  String PID = "PID":+values[0];
  String USER = "USER:"+values[1];
  String COMMAND = "COMMAND:"+values[11];
  //now do whatever you want with it, for example
  String [] res = {PID, USER, COMMAND};
 }

Upvotes: 2

Rafi Kamal
Rafi Kamal

Reputation: 4600

Just split each line.

String[] fields = line.split("\\s+"); // split based on whitespace characters
String PID = fields[0];
String USER = fields[1];
String COMMAND= fields[11];

Upvotes: 2

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