从 Java 中的字符串中获取特定的数据值（字符串不带逗号）

Question

I want to get the value from a string.

I have a string value like this:

String myData= "Number: 34678 Type: Internal Qty: 34";

How can I get the Number, Type, Qty values separately?

Give me any suggestion on this.

Input:

String myData= "Number: 34678 Type: Internal Qty: 34";

Output:

Number value is 34678 
Type values is Internal 
Qty value is 34

Answer 1

I suppose the string is always formatted like that. Ie, n attribute names each followed by a value that does not contain spaces. In other words, the 2n entities are separated from each other by 1 or more spaces.

If so, try this:

String[] parts;
int      limit;
int      counter;
String   name;
String   value;
parts = myData.split("[ ]+");
limit = (parts.length / 2) * 2; // Make sure an even number of elements is considered
for (counter = 0; counter < limit; counter += 2)
{
  name = parts[counter].replace(":", "");
  value = parts[counter + 1];
  System.out.println(name + " value is " + value);
}

Answer 2

You can use regex to do this cleanly:

Pattern p = Pattern.compile("Number: (\\d*) Type: (.*) Qty: (\\d*)");
Matcher m = p.matcher(myData);
m.find()

So you'll get the number with m.group(1) , the Type m.group(2) and the Qty m.group(3) .

I assume you accept a limited number of types. So you can change the regex to match only if the type is correct, for eg. either Internal or External: "Number: (\\d*) Type: (Internal|External) Qty: (\\d*)"

Here's a nice explanation of how this works

Answer 3

Here is one way to do it. It looks for a word following by a colon followed by zero or more spaces followed by another word. This works regardless of the order or names of the fields.

      String myData = "Number: 34678 Type: Internal Qty: 34";
      Matcher m = Pattern.compile("(\\S+):\\s*(\\S+)").matcher(myData);
      while (m.find()) {
         System.out.println(m.group(1) + " value is " + m.group(2));
      }

Answer 4

If you just want to print them with fixed pattern of input data, a simplest way is shown as follows: (Just for fun!)

System.out.print(myData.replace(" Type", "\nType")
            .replace(" Qty", "\nQty")
            .replace(":", " value is"));

Answer 5

This Should work

    String replace = val.replace(": ", "|");

    StringBuilder number = new StringBuilder();
    StringBuilder type = new StringBuilder();
    StringBuilder qty = new StringBuilder();
    String[] getValues = replace.split(" ");
    int i=0;
    while(i<getValues.length-1){
        String[] splitNumebr = getValues[i].split("\\|");
        number.append(splitNumebr[1]);
        String[] splitType = getValues[i+=1].split("\\|");
        type.append(splitType[1]);
        String[] splitQty = getValues[i+=1].split("\\|");
        qty.append(splitQty[1]);
    }
    System.out.println(String.format("Number value is %s",number.toString()));
    System.out.println(String.format("Type value is %s",type.toString()));
    System.out.println(String.format("Qty value is %s",qty.toString()));

}

Output
Number value is 34678
Type value is Internal
Qty value is 34