java好习惯2

public static String map2Content(Map params){
  StringBuilder stringBuilder=new StringBuilder();
  try {
    Set keySet=params.keySet();
    Object[] keys=keySet.toArray();
    for (int i=0; i < keys.length; i++) {
      stringBuilder.append(encode(keys[i].toString(),"UTF-8")).append("=").append(encode(params.get(keys[i]).toString(),"UTF-8"));
      if (i < (keys.length - 1)) {
        stringBuilder.append("&");
      }
    }
  }
 catch (  Exception e) {
    throw new HttpException("failed to generate content from map",e);
  }
  return stringBuilder.toString();
}

private void saveUsers(Set<String> set,String fileName){
  File f=new File(getDataFolder(),fileName);
  if (f.exists()) {
    f.delete();
  }
  try {
    f.createNewFile();
    BufferedWriter bWriter=new BufferedWriter(new FileWriter(f));
    int count=0;
    for (    String name : set) {
      bWriter.write(name + System.getProperty("line.separator"));
      count++;
    }
    ConsoleUtils.printInfo(NAME,"Saved " + count + " users in ‘"+ fileName+ "‘!");
    bWriter.flush();
    bWriter.close();
  }
 catch (  Exception e) {
    ConsoleUtils.printException(e,NAME,"Error while saving file ‘" + fileName + "‘!");
  }
}

@Override public Set<Activity> ge
tInstitutionActivities(){
  Set<Activity> activities=new HashSet<Activity>();
  for (int i=0; i < institutionActivities.getWidgetCount(); i++) {
    Widget widget=institutionActivities.getWidget(i);
    if (widget instanceof CheckBox) {
      CheckBox cb=(CheckBox)widget;
      if (cb.getValue()) {
        Activity activity=new Activity();
        activity.setId(Integer.parseInt(cb.getFormValue()));
        activity.setName(cb.getText());
        activities.add(activity);
      }
    }
  }
  return activities;
}

private Object createStringSet(String... strings){
  Set<String> stringSet=new HashSet<String>();
  for (  String string : strings) {
    stringSet.add(string);
  }
  return stringSet;
}

public static String getSearchEngineQueryString(HttpServletRequest request,String referrer){
  String queryString=null;
  String hostName=null;
  if (referrer != null) {
    URL refererURL;
    try {
      refererURL=new URL(referrer);
    }
 catch (    MalformedURLException e) {
      return null;
    }
    hostName=refererURL.getHost();
    queryString=refererURL.getQuery();
    if (Strings.isEmpty(queryString)) {
      return null;
    }
    Set<String> keys=seParams.keySet();
    for (    String se : keys) {
      if (hostName.toLowerCase().contains(se)) {
        queryString=getQueryStringParameter(queryString,seParams.get(se));
      }
    }
    return queryString;
  }
  return null;
}