我有一个 JSF validator ,用于验证表单中的输入。
当我插入简单字符串或重复字符串时,它工作正常。但是,当我不输入任何内容时,正确的消息将是此字段不能为空!": "'"+ s + "' 不是有效名称!
但我什么也没得到。你能帮我找出代码逻辑中的问题吗?
// Validate Datacenter Name
public void validateDatacenterName(FacesContext context, UIComponent component, Object value) throws ValidatorException, SQLException
{
String l;
String s = value.toString().trim();
if (s != null && s.length() > 18)
{
throw new ValidatorException(new FacesMessage(FacesMessage.SEVERITY_ERROR,
" Value is too long! (18 digits max)", null));
}
try
{
// l = Long.parseLong(s);
// if (l > Integer.MAX_VALUE)
// {
// throw new ValidatorException(new FacesMessage(FacesMessage.SEVERITY_ERROR,
// " '" + l + "' is too large!", null));
// }
}
catch (NumberFormatException nfe)
{
l = null;
}
if (s != null)
{
if (ds == null)
{
throw new SQLException("Can't get data source");
}
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs;
int cnt = 0;
try
{
conn = ds.getConnection();
ps = conn.prepareStatement("SELECT count(1) from COMPONENTSTATS where NAME = ?");
ps.setString(1, s);
rs = ps.executeQuery();
while (rs.next())
{
cnt = rs.getInt(1);
}
if (cnt > 0)
{
throw new ValidatorException(new FacesMessage(FacesMessage.SEVERITY_ERROR,
" '" + s + "' is already in use!", null));
}
}
catch (SQLException x)
{
throw new ValidatorException(new FacesMessage(FacesMessage.SEVERITY_ERROR,
" SQL error!", null));
}
finally
{
if (ps != null)
{
ps.close();
}
if (conn != null)
{
conn.close();
}
}
}
else
{
throw new ValidatorException(new FacesMessage(FacesMessage.SEVERITY_ERROR,
s.isEmpty() ? " This field cannot be empty!" : " '" + s + "' is not a valid name!", null));
}
}
最佳答案
那是因为你只检查 s 是否为 != null。
将 if (s != null)
更改为 if (s != null && s.lenght() > 0)
并重试。
顺便说一句,您的 String
不能为 null,因为您使用它来初始化它
String s = value.toString().trim();
如果您的值
为空,这将导致 NullPointerException。
关于java - validator 无法正常工作,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14787671/