volicity 替换字符串

转自：http://blog.csdn.net/wxyFighting/article/details/8869772?locationNum=16

public class VelocityTest {  

    private static Properties props = new Properties();  

    static {  
        props.setProperty(Velocity.INPUT_ENCODING, "UTF-8");  
        props.setProperty(Velocity.RESOURCE_LOADER, "class");  
        props.setProperty("class.resource.loader.class",  
                "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");  
    }  

    public static void main(String[] args) {  
        testStringVelocity();  
        testCommonsStringUtils();  
    }  

    /** 
     * 测试字符串模板替换 
     */  
    private static void testStringVelocity() {  
        // 初始化并取得Velocity引擎  
        VelocityEngine engine = new VelocityEngine(props);  
        // 字符串模版  
        String template = "${owner}：您的${type} : ${bill} 在  ${date} 日已支付成功";  
        // 取得velocity的上下文context  
        VelocityContext context = new VelocityContext();  
        // 把数据填入上下文  
        context.put("owner", "nassir");  
        context.put("bill", "201203221000029763");  
        context.put("type", "订单");  
        context.put("date",  
                new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));  
        StringWriter writer = new StringWriter();  
        engine.evaluate(context, writer, "", template);  
        System.out.println(writer.toString());  

    }  

    /** 
     * 测试模板静态方法使用 
     */  
    private static void testCommonsStringUtils() {  
        VelocityEngine engine = new VelocityEngine();  
        engine.init();  
        VelocityContext ctx = new VelocityContext();  
        ctx.put("stringUtils", new StringUtils());  
        ctx.put("comments", "this is a \n newline test");  
        ctx.put("newline", "\n");  
        ctx.put("break", "<br/>");  
        String template = "#set($comments = $stringUtils.replace($comments,$newline,$break))";  
        template += "$comments";  
        StringWriter writer = new StringWriter();  
        engine.evaluate(ctx, writer, "", template);  
        System.out.println(writer.toString());  
        // assertEquals("this is a <br /> newline test", writer.toString());  
    }  
}