velocity把字符串当做模板-蒲公英云

velocity把字符串当做模板

velocity把字符串当做模板方式一：(这种方式网上有很多)

public static void main(String[] args) throws Exception {
  // 初始化并取得Velocity引擎
  VelocityEngine ve = new VelocityEngine();
   ve.init();
  // 取得velocity的模版内容, 模板内容来自字符传
  String content = "";
   content += "Welcome  $name  to Javayou.com! ";
   content += " today is  $date.";
  // 取得velocity的上下文context
   VelocityContext context = new VelocityContext();
  // 把数据填入上下文
  context.put("name", "javaboy2012");
  context.put("date", (new Date()).toString());
  // 输出流
  StringWriter writer = new StringWriter();
  // 转换输出
  ve.evaluate(context, writer, "", content); // 关键方法
  System.out.println(writer.toString());
 }

velocity把字符串当做模板方式二：这种方式不常见,个人感觉麻烦，但是模板放数据库的方便管理与维护

1.主方法

Properties p = new Properties();
//p.setProperty("input.encoding", "UTF-8");
//p.setProperty("output.encoding", "UTF-8");
//p.setProperty("resource.loader", "srl");
p.setProperty("resource.loader", "string");
p.setProperty("string.resource.loader.class",
        "org.apache.velocity.runtime.resource.loader.StringResourceLoader");
p.setProperty("string.resource.loader.repository.class",
        "com.lifeng.pcis.StringTemplateRepository");  //这是自定义的获取模板实现类
try {
    Velocity.init(p);
} catch (Exception e) {
    Velocity.init(p);
}
Template template = Velocity.getTemplate(draftsman.getEdrType() + ","
        + draftsman.getProdNo() + "," + draftsman.getReasonOrBundleCode(), "UTF-8");
VelocityContext velocityContext = new VelocityContext();
velocityContext.put("draftsman", draftsman);
StringWriter sw = new StringWriter();
template.merge(velocityContext, sw);
logger.debug(sw.toString());

2.StringTemplateRepository实现类

public class EndorseWordingTemplateRepository implements StringResourceRepository {
    public String getEncoding() {
        // TODO Auto-generated method stub
        return "UTF-8";
    }
    public StringResource getStringResource(String name) {
        // TODO Auto-generated method stub
        String nameSects[] = name.split(",");
        try {
            String str = "";//这里可以根据传进来的参数name，查询模板(模板可以在数据库或文件中)
            return new StringResource(str, this.getEncoding());
        } catch (BusinessServiceException e) {
            throw new ResourceNotFoundException("获取模板异常");
        }
    }
    public void putStringResource(String arg0, String arg1, String arg2) {
        // TODO Auto-generated method stub
    }
    public void putStringResource(String arg0, String arg1) {
        // TODO Auto-generated method stub
    }
    public void removeStringResource(String arg0) {
        // TODO Auto-generated method stub
    }
    public void setEncoding(String arg0) {
        // TODO Auto-generated method stub
    }
}