线程" main"中的例外情况java.util.NoSuchElementException?

时间:2014-04-04 10:57:32

标签: java exception

我正在尝试从网站中提取值并在我的数据库中插入值,当我要在我的数据库中插入数据时我正在获取此异常

异常是:线程中的异常" main" java.util.NoSuchElementException

这是我的代码

public class ScrapCom {
    Statement st = null;
    Connection cn = null;
    public static void main(String args[]) throws InterruptedException, ClassNotFoundException, SQLException {
        int j = 0;
        WebDriver driver = new HtmlUnitDriver(BrowserVersion.getDefault());
        String sDate = "27/03/2014";
        String url = "http://www.upmandiparishad.in/commodityWiseAll.aspx";
        driver.get(url);
        Thread.sleep(5000);
        new Select(driver.findElement(By.id("ctl00_ContentPlaceHolder1_ddl_commodity"))).selectByVisibleText("Jo");
        driver.findElement(By.id("ctl00_ContentPlaceHolder1_txt_rate")).sendKeys(sDate);
        Thread.sleep(3000);
        driver.findElement(By.id("ctl00_ContentPlaceHolder1_btn_show")).click();
        Thread.sleep(5000);
        WebElement findElement = driver.findElement(By.id("ctl00_ContentPlaceHolder1_GridView1"));
        String htmlTableText = findElement.getText();
        // do whatever you want now, This is raw table values.
        htmlTableText = htmlTableText.replace("S.No.DistrictMarketPrice", "");
        htmlTableText = htmlTableText.replaceAll("\\s(\\d+\\s[A-Z])", "\n$1");
        htmlTableText = htmlTableText.replaceAll("(?=(.*?[ ]){4,}).*?[\n\r]", "");
        System.out.println(htmlTableText);
        StringTokenizer str = new StringTokenizer(htmlTableText);
        while (str.hasMoreElements()) {
            for (int i = 0; i < 4; i++) {
                String no = str.nextElement().toString();
                String city = str.nextElement().toString();
                String mandi = str.nextElement().toString();
                String price = str.nextElement().toString();
                Class.forName("com.mysql.jdbc.Driver");
                Connection cn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mandi", "root", "");
                //insert them into the database
                PreparedStatement ps = cn.prepareStatement("insert into commoditywise  values(?,?,?,?)");
                ps.setString(1, no);
                ps.setString(2, city);
                ps.setString(3, mandi);
                ps.setString(4, price);
                j = ps.executeUpdate();
                cn.close();
            }
        }
        if (j == 1) {
            System.out.println("data inserted");
        } else {
            System.out.println("not inserted");
        }
        driver.close();
        driver.quit();
    }
}

更新了例外

Exception in thread "main" java.util.NoSuchElementException
    at java.util.StringTokenizer.nextToken(StringTokenizer.java:349)
    at java.util.StringTokenizer.nextElement(StringTokenizer.java:407)
    at Getdata1.main(Getdata1.java:48)
Java Result: 1

我在这里缺少什么?

如何删除此异常

提前致谢

1 个答案:

答案 0 :(得分:1)

我猜你的问题不是数据库插入。如果下一个元素可用,则您使用StringTokenizer.nextElement()而不使用testig。

while (str.hasMoreElements()) {
    for (int i = 0; i < 4; i++) {
         String no = str.nextElement().toString();
         String city = str.nextElement().toString();
         String mandi = str.nextElement().toString();
         String price = str.nextElement().toString();

如果您连续多次进行nextElement()次调用,首先应使用StringTokenizer.countTokens()检查预期的令牌数是否可用

  

public int countTokens()

     

计算此令牌化程序的nextToken方法可以被调用的次数&gt;在它生成异常之前。目前的立场没有提前。

     

返回:      使用当前分隔符集保留在字符串中的标记数。   也可以看看:       的nextToken()