Question

出现 java.lang.StringIndexOutOfBoundsException: String index out of range: 12300 怎么回事?

@Override
public List<Emp> getAllList() {
// TODO Auto-generated method stub
RowMapper<Emp> rowMapper = new RowMapper<Emp>(){
@Override
public Emp mapRow(ResultSet arg0, int arg1) throws SQLException {

String username = arg0.getString("username");
String password = arg0.getString("password");
String loginname = arg0.getString("loginname");
return new Emp(username, password, loginname);
};
};
List<Emp> list = jdbcTemplate.query("SELECT * FROM employee", rowMapper);
return list;
}

Answer 1

while(rs.next())
{
String max = rs.getString("maxint"); //获得最大的字段
String maxi = max.substring(2,max.length()); //截取子字符串
newmax = "CB" + String.valueOf(Integer.parseInt(maxi) + 1);
}

我估计是不是
String max = rs.getString("maxint"); //获得最大的字段
这句话没有获得到值 导致了 null或者 长度<3
然后下面再 max.substring(2,max.length()); //截取子字符串
就会抛上面的错误
你先确定一下max是不是空