- 簡單實現
關於java字符串佔位符替換,專業方式是使用String.format和MessageFormat.format功能,這裏提供個簡單的基於正則實現的字符串佔位符實現
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;
}