velocity簡單樣例
velocity簡單樣例整體實現須要三個步驟,詳細例如以下:
1、創建一個Javaproject
2、導入須要的jar包
3、創建須要的文件
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1、創建一個Javaproject
名稱:JKTest,例如以下:
2、導入須要的jar包
velocity-1.7.jar velocity-1.7-dep.jar
詳細下載地址:
http://yunpan.cn/QTdCXHsIrcDff 訪問password 0029
http://yunpan.cn/QTdC945Nm5PzQ 訪問password e6d2
3、創建須要的文件
Example.java
package jk003; import org.apache.velocity.app.Velocity; import org.apache.velocity.VelocityContext; import org.apache.velocity.Template; import org.apache.velocity.exception.ParseErrorException; import org.apache.velocity.exception.ResourceNotFoundException; import java.io.*; import java.util.ArrayList; public class Example { public Example(String templateFile) { try { /* * setup */ Velocity.init("./src/jk003/velocity.properties"); /* * Make a context object and populate with the data. This * is where the Velocity engine gets the data to resolve the * references (ex. $list) in the template */ VelocityContext context = new VelocityContext(); context.put("list", getNames()); /* * get the Template object. This is the parsed version of your * template input file. Note that getTemplate() can throw * ResourceNotFoundException : if it doesn't find the template * ParseErrorException : if there is something wrong with the VTL * Exception : if something else goes wrong (this is generally * indicative of as serious problem...) */ Template template = null; try { template = Velocity.getTemplate(templateFile); } catch( ResourceNotFoundException rnfe ) { System.out.println("Example : error : cannot find template " + templateFile ); } catch( ParseErrorException pee ) { System.out.println("Example : Syntax error in template " + templateFile + ":" + pee ); } /* * Now have the template engine process your template using the * data placed into the context. Think of it as a 'merge' * of the template and the data to produce the output stream. */ BufferedWriter writer = new BufferedWriter( new OutputStreamWriter(System.out)); if ( template != null) template.merge(context, writer); /* * flush and cleanup */ writer.flush(); writer.close(); } catch( Exception e ) { System.out.println(e); } } public ArrayList getNames() { ArrayList list = new ArrayList(); list.add("ArrayList element 1"); list.add("ArrayList element 2"); list.add("ArrayList element 3"); list.add("ArrayList element 4"); return list; } public static void main(String[] args) { Example t = new Example("./src/jk003/example.vm"); } }
example.vm
#set( $this = "Velocity")
$this is great!
#foreach( $name in $list )
$name is great!
#end
#set( $condition = true)
#if ($condition)
The condition is true!
#else
The condition is false!
#end
velocity.properties
runtime.log = velocity_example.log
最後執行:Example.java
控制臺輸出:
Velocity is great!
ArrayList element 1 is great!
ArrayList element 2 is great!
ArrayList element 3 is great!
ArrayList element 4 is great!
The condition is true!
velocity簡單樣例