泛型方法案例

public <T> List<T> getGAPListByDate(String webDataSource, String webPlatType, Date startDt, Date endDt, String tableName, Class<T> cls) {
    SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String greDate = ">=STR_TO_DATE('" + sf.format(startDt) + "','%Y-%m-%d %H:%i:%s')";
    String lesDate = "<STR_TO_DATE('" + sf.format(endDt) + "','%Y-%m-%d %H:%i:%s')";
    StringBuffer sql = new StringBuffer("select * from ");
    sql.append(tableName + " ");
    sql.append("where (");
    sql.append("(create_date" + greDate + " AND create_date" + lesDate + ") or ");
    sql.append("(update_date" + greDate + " AND update_date" + lesDate + ") or ");
    sql.append("(delete_date" + greDate + " AND delete_date" + lesDate + ") or ");
    sql.append("(in_date" + greDate + " AND in_date" + lesDate + ")");
    sql.append(") ");
    //if (ConstantUtil.SEAL_TABLE_NAME.equals(tableName)) {
    //    sql.append("and ").append("( ").append("vertify_type IN ('1','2')").append(") ");
    //}
    //logger.info("query sql=" + sql);
    Long st = System.currentTimeMillis();
    Query query = this.getSession().createSQLQuery(sql.toString()).addEntity(cls);
    List<T> list = query.list();
    Long end = System.currentTimeMillis();
    //logger.info("use time/s:"+(end-st)/1000);
    return list;
}

//引用

List<Seal> list = getGAPListByDate(GAPFaceMessageCode.WEB_DATA_SOURCE, GAPFaceMessageCode.WEB_PLAT_TYPE,
        startDt, endDt, ConstantUtil.SEAL_TABLE_NAME, Seal.class);
//说明

Class类的实例表示Java应用运行时的类(class ans enum)或接口(interface and annotation)（每个java类运行时都在JVM里表现为一个Class对象，可通过类名.class,类型.getClass(),Class.forName("类名")等方法获取Class对象）