流水号生成规则

从“0001”号起始，依序不跳跃不间断地编号，形成流水编码，依次为0001、0002、0003、0004、0005、0006…等。当编至“9999”号，仍需继续编号时，从“A000”号（A000代表10000）起始重新序排，依次为A000、A001、A002…A999（A999代表10999）及B000（B000代表11000）、B001、B002…等。

代码编写

public static String getNextLsh(String maxXh){String lsh = "";char first = maxXh.charAt(0);if(first >= 'A' && first <= 'Z'){	//字母开头if (maxXh.substring(1, 4).equals("999")) {// 累加字母first++;if (first == '[') {System.out.println("超出编号范围!!");return "XXXX";}else{lsh = first + "000";}}else{int maxLsh = Integer.parseInt(maxXh.substring(1, 4));maxLsh = maxLsh + 1;maxXh = maxLsh + "";int k = 3 - maxXh.length();for (int i = 0; i < k; i++) {maxXh = "0" + maxXh;}lsh = first + maxXh;}}else{	//数字开头int maxLsh = Integer.parseInt(maxXh);if(maxLsh == 9999){lsh = "A" + "000";}else{maxLsh = maxLsh + 1;maxXh = maxLsh + "";int k = 4 - maxXh.length();for (int i = 0; i < k; i++) {maxXh = "0" + maxXh;}lsh = maxXh;}}return lsh;}

值得一提的是，char可以直接++计算

下边直接看结果：