java 如何自动生成编号_java自动生成编号的实现(格式：yyMM+四位流水号)

本篇文章主要介绍了java自动生成编号的实现，分享给大家，具体如下

/**

* 自动生成编号格式：yyMM+四位流水号

*/

@RequestMapping(params = "createCode")

@ResponseBody

public AjaxJson createCode(HttpServletRequest request, String tableName,

String fieldName) {

AjaxJson j = new AjaxJson();

String sql = "select Max(a." + fieldName + ") max_code from "

+ tableName + " a ";

List> list = new ArrayList>();

list = jdbcTemplate.queryForList(sql);

// System.out.println("最大编号："+list.get(0).get("max_comment_code"));

String comment_code = "";

String max_code = "";

if (list.size() > 0) {

max_code = (String) list.get(0).get("max_code");

}

SimpleDateFormat