Getting substring from String in java

Question

I have a string that contains data with different values, something like

String values = "firstname=john&lastname=fob&email=something@something.com&Telephone=3874813781"

FYI: & is the separator.

I want to make a new string for all these parameters - firstname, lastname, email and etc... - and I want the string to contain only the value of it specific parameter something like

String firstname = "john";

and same for lastname and so on. I think it is not better to use

String firstname = values.indexOf(10);

because I don't know how many characters would the username contain so I could go for lastname an so, I was wondering if there is a better way for getting the values of each parameter and assign it to a new string.

Use ```String.split("&");``` which will return an array of Strings which are seperated with ```&``` . — Sanket Makani, Aug 27 '16 at 18:54
See the answer I have written with proper syntax and given sample output also for the input string you have given. — Sanket Makani, Aug 27 '16 at 19:03

score 1 · Accepted Answer · answered Aug 27 '16 at 18:54

1

You can use split method. Use values.split("&") , this will return you an array of Strings.

String values = "firstname=john&lastname=fob&email=something@something.com&Telephone=3874813781";
String[] parameters = values.split("&");
System.out.println(parameters[0]); // Prints firstname=john

answered Aug 27 '16 at 18:54

Priyansh Goel

2,660
1
13
37

1

Thank you very much, it's working just the way i wanted! – jacky Aug 27 '16 at 19:05
@jacky : No problem :) – Priyansh Goel Aug 27 '16 at 19:06

score 1 · Answer 2 · answered Aug 27 '16 at 19:00

Use String values_seperated[] = values.split("&"); Which will give you an array of Strings.

so here elements of values_seperated[] array will be:

values_seperated[0]:firstname=john
values_seperated[1]:lastname=fob
values_seperated[2]:email=something@something.com
values_seperated[3]:Telephone=3874813781

score 1 · Answer 3 · answered Aug 27 '16 at 19:01

String[] split = values.split("&");

String firstname = null, lastname = null, email = null, Telephone = null;

for (String string : split) {
    String[] parts = string.split("=");
    String key = parts[0];
    String value = parts[1];

    switch (key) {
    case "firstname":
        firstname = value;
        break;
    case "lastname":
        lastname = value;
        break;
    case "email":
        email = value;
        break;
    case "Telephone":
        Telephone = value;
        break;
    }
}

score 0 · Answer 4 · answered Aug 27 '16 at 19:09

There's a function in java that separates java tokens based on a delimiter that you want. The following solution assumes that the same sequence of parameters in the values string will be used:

    String values =  "firstname=john&lastname=fob&email=something@something.com&Telephone=3874813781";

    StringTokenizer st = new StringTokenizer(values,"&");
    String nextToken; 

    nextToken=st.nextToken();
    String firstname=nextToken.substring(nextToken.indexOf("=")+1);

    nextToken=st.nextToken();
    String lastname=nextToken.substring(nextToken.indexOf("=")+1);

    nextToken=st.nextToken();
    String email=nextToken.substring(nextToken.indexOf("=")+1);

    nextToken=st.nextToken();
    String Telephone=nextToken.substring(nextToken.indexOf("=")+1);

    System.out.println(firstname+" "+lastname+" "+email+" "+Telephone);

StringTokenizer(values,"&") splits the String into multiple tokens Then one by one you can assign the values to the respective variables.

st.nextToken() fetches tokens one by one

Getting substring from String in java

4 Answers4