How to use Apache strsubstitutor

In Java, it's hard to use a formatted string, whether it's String.Format or Messageformat. Velocity is good, but it's too heavy. Today, we recommend Apache Commons-lang in Strsubstitutor.

Document Address: https://commons.apache.org/proper/commons-lang/apidocs/org/apache/commons/lang3/text/StrSubstitutor.html

Strsubstitutor in Apache Commons-lang3 package, to use, please add the following dependencies in the Pom.xml:

1 <dependency>2     <groupId>org.apache.commons</groupId>3     <artifactId>commons-lang3</artifactId>4     <version>3.4</version>5 </dependency>

1, directly replace the system property values

strsubstitutor.replacesystemproperties (    "You is running with java.version = ${java.version} and Os.name = ${os.name}. ");

2. Replace placeholders in strings with map

Map Valuesmap = HashMap ();
Valuesmap.put ("Animal", "Quick brown fox");
Valuesmap.put ("target", "lazy dog"= "The ${animal} jumped over the ${target}." ;
New= Sub.replace (templatestring);

Resolvedstring Result: The quick brown fox jumped over the lazy dog.

3. Strsubstitutor will replace variables recursively, such as:

map<string, object> params = maps.newhashmap (); params.put ("name", "${x}");p arams.put ("x", "Y");
New Strsubstitutor (params);

String Hello2 = "${name}";
System.out.println (Strsubstitutor.replace (Hello2));

The final output is: Y

4, sometimes the variable is also nested other variables, this strsubstitutor is also supported, but to call the next setenablesubstitutioninvariables can be.

map<string, object> params = maps.newhashmap ();p arams.put ("jre-1.8", "java-version-1.8"); Params.put ("java.specification.version", "1.8"new  strsubstitutor (params);           Strsubstitutor.setenablesubstitutioninvariables (true); System.out.println (Strsubstitutor.replace ("${jre-${java.specification.version}}");

Output: java-version-1.8

How to use Apache strsubstitutor