把map集合转成 insert 的SQL语句，map中key作为字段名，value作为字段值

 1 StringBuilder sb = new StringBuilder();
 2 sb.append("INSERT INTO table (");
 3 for (String key : map.keySet()) {
 4     sb.append(key).append(",");
 5 }
 6 sb.deleteCharAt(sb.length() - 1);
 7 sb.append(") VALUES (");
 8 for (Object value : map.values()) {
 9     if (value instanceof String) {
10         sb.append("'").append(value).append("',");
11     } else {
12         sb.append(value).append(",");
13     }
14 }
15 sb.deleteCharAt(sb.length() - 1);
16 sb.append(")");
17 String sql = sb.toString();
18 System.out.println(sql);