Velocity初学小示例

Velocity作为替换模板是在有独特优势，最近小学了一下，感觉很不错，下载资源包目前最新为1.6.3的，除了velocity1.6.3.jar之外,lib目录下的所有jar都需要添加到项目中去

public class VelocityHandle {
	/**
	 * @param clazz
	 * @return 插入实体的insert sql命令
	 * @throws Exception
	 */
	private static String sqlBuilder() {
		try {
			Velocity.init();
			String sqlCmd = "insert into $table ($columns) values ($params)";
			VelocityContext ctx = new VelocityContext();
			ctx.put("table", "target");
			ctx.put("params", "aa");
			ctx.put("columns", "xxx");
			StringWriter writer = new StringWriter();
			Velocity.evaluate(ctx, writer, "mystring", sqlCmd);
			String str = writer.toString();
			writer.close();
			return str;
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}
	public static void main(String[] args){
		System.out.println(sqlBuilder());
	}

}