Write Keys and Values to the Properties file in
Java
In this section, you will learn how to write keys and values
in the properties files through the Java program. The program for writing keys
and values to the properties file has been mentioned just ahead.
Program Result Description:
This program takes a file name and checks whether the
file exists or not. If the
file exists then it performs the next operations, otherwise shows the
appropriate message like: "File not found!"
and then gives you one more chance for entering the file name of the properties
file by showing the message "Enter file name which has properties
extension :". This message is shown until
the entered file exists. If the properties file exists then the key and it's
regarding value has to be entered which has to be written to the properties
file.
Here, the following methods and APIs are explained as
follows which have been used in the program:
pro.setProperty(String key, String val):
This method takes keys and it's degrading
values and puts into the properties file list through the help of hash table.
pro.store((OutputStream out), null):
This is the method that can be used to write or
store the keys and values in properties file list. The
OutputStream used when you use the load() method in the program. It
takes the OutputStream and comments, but here the only used to OutputStream and
no any header or comments( as like descriptions of the properties list).
Here is the code of program:
import java.io.*;
import java.util.*;
public class WriteProperty{
String str, key, val;
public static void main(String[] args) {
WriteProperty w = new WriteProperty();
}
public WriteProperty(){
try{
int check=0;
while(check == 0){
check=1;
BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter file name which has properties extension:");
str = bf.readLine();
Properties pro = new Properties();
File f = new File(str + ".properties");
if(!f.exists()){
check=0;
System.out.println("File not found!");
}
else{
FileInputStream in = new FileInputStream(f);
pro.load(in);
System.out.print("Enter Key : ");
key = bf.readLine();
System.out.print("Enter Value : ");
val = bf.readLine();
pro.setProperty(key, val);
pro.store(new FileOutputStream(str + ".properties"),null);
System.out.println("Operation completly successfuly!");
}
}
}
catch(IOException e){
System.out.println(e.getMessage());
}
}
}
|
Download this example.
|
Del.icio.us
Digg
Google
Spurl
Blink
Furl
Simpy
Y! MyWeb
