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[英]Exception in thread “main” java.util.NoSuchElementException
[英]Exception in thread “main” java.util.NoSuchElementException?
当我要在数据库中插入数据时,我试图从网站中提取值并在数据库中插入值。
异常是:线程“ main”中的异常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();
}
}
更新的例外
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
我在这里想念什么?
我如何删除此例外
提前致谢
我猜你的问题不是数据库插入。 如果下一个元素可用,则使用不带testig的StringTokenizer.nextElement()
。
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();
如果您连续执行多个nextElement()
调用,则应首先使用StringTokenizer.countTokens()
检查预期的令牌计数是否可用
public int countTokens()
计算此令牌生成器的nextToken方法在生成异常之前可以被调用的次数。 当前位置未提前。
返回:使用当前定界符集保留在字符串中的令牌总数。 另请参见:nextToken()
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