Java uses regular expressions to implement a string template instance in the form of ${name} _java

Objective

I believe you may have encountered this situation, in the development of similar in-Station letter requirements, we often use string templates, such as

Honorable User ${name} ....

The inside ${name} can be replaced with the user's user name.

The following is a simple implementation of this function using regular expressions:

/**
  * Fills strings based on key value pairs, such as ("Hello ${name}", {name: "Xiaoming"})
  * output:
  * @param content
  * @param map
  * return
  *
 /public static string renderstring (string content, map<string, string> Map) {
  set< entry<string, string>> sets = Map.entryset ();
  For (entry<string, string> entry:sets) {
   String regex = "\\$\\{" + entry.getkey () + "\}";
   Pattern pattern = pattern.compile (regex);
   Matcher Matcher = pattern.matcher (content);
   Content = Matcher.replaceall (Entry.getvalue ());
  }
  return content;
 }

A map key-value pair is stored in, then a collection of key-value pairs is retrieved, and the collection is traversed to render the string

Instance test:

@Test public
 void Renderstring () {
  String content = "Hello ${name}, 1 2 3 4 5 ${six} 7, again ${name}.";
  map<string, string> map = new hashmap<> ();
  Map.put ("name", "Java");
  Map.put ("Six", "6");
  Content = stringhelper.renderstring (content, map);
  SYSTEM.OUT.PRINTLN (content);
 }

There are two variables that need to be replaced, name and the six corresponding values are Java and 6 respectively, and two are called at the same time name .

Results:

Summarize

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