velocity把字符串当做模板

骑猪看日落 2022-09-26 01:49 226阅读 0赞

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
        }
    }