java 字串預留位置替換之字串預留位置實現(java簡單模板渲染實現)

簡單實現

關於java字串預留位置替換,專業方式是使用String.format和MessageFormat.format功能,這裡提供個簡單的基於正則實現的字串預留位置實現

    public static String tpl(String tplStr,Map<String, Object> data ) {         Matcher m=Pattern.compile("\\{([\\w\\.]*)\\}").matcher(tplStr);            while(m.find()){                   String group=m.group();                   group= group.replaceAll("\\{|\\}", "");                   String value="";                   if(null!=data.get(group)){                       value=String.valueOf(data.get(group));                   }                   tplStr=tplStr.replace(m.group(),value);            }            return tplStr;    }

使用freemarker等模板引擎

private String defaultCharacter = "UTF-8";private Configuration cfg;public FreemarkerUtils() {        cfg = new Configuration();        cfg.setDefaultEncoding(defaultCharacter);      cfg.setTagSyntax(Configuration.AUTO_DETECT_TAG_SYNTAX);     }public  String generateString(               Map<String, Object> data,  String tplStr) {          String result = null;          String name="myStrTpl";          try {               StringTemplateLoader stringTemplateLoader= new StringTemplateLoader();              stringTemplateLoader.putTemplate(name, tplStr);                cfg.setTemplateLoader(stringTemplateLoader);                Template template = cfg.getTemplate(name,defaultCharacter);                StringWriter out = new StringWriter();                 template.process(data, out);                  out.flush();                  result= out.toString();                out.close();             } catch (Exception e) {                  e.printStackTrace();              }            return result;      }