Knowledge Walls
John Peter
Pune, Maharashtra, India
Examples
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Examples [cont'd]
How to use Else-If ladder in Java velocity with Example How to use For loop in Java velocity with Example How to use #break in foreach of Java apache velocity with Example How to use #continue in foreach of Java apache velocity with Example How to use Single line and Multiline Comment in Java apache velocity with Example How to use expressions with #set method of java apache velocity with Example How to use Java Class in apache velocity template engine with Example
Examples [cont'd]
How to include vm file into another vm file in java apache velocity with Example How to create methods in Java apache velocity using #macro with Example How to escape velocity template reserved words or keywords in .vm with Example How to exit from the velocity template language execution using #stop with Example How to use arithmetic expressions in java apache velocity with Example How to use not specified velocity context variable value as empty in VTL with Example
How to use string as velocity template data with Example
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Hints 
String context value map example for basic velocity program to write username value into datapage.vm template via java.

VelocityEngine class is used to parse the Velocity template (vm) file. VelocityContext contians all the data which is needed to bind in (.vm) file. StringWriter stream writes the data into the stream.
Example
RuntimeServices rs = RuntimeSingleton.getRuntimeServices();            
StringReader sr = new StringReader("Username is $username");
SimpleNode sn = rs.parse(sr, "User Information");

Template t = new Template();
    t.setRuntimeServices(rs);
    t.setData(sn);
    t.initDocument();

VelocityContext vc = new VelocityContext();
vc.put("username", "John");

StringWriter sw = new StringWriter();
t.merge(vc, sw);
    
System.out.println(sw.toString());
Output 
Username is John
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