NoClassDefFoundError：用于 ChromeDriver 的 Selenium 中的 org/apache/http/HttpEntity？答案

【问题标题】：NoClassDefFoundError: org/apache/http/HttpEntity in Selenium for ChromeDriver?NoClassDefFoundError：用于 ChromeDriver 的 Selenium 中的 org/apache/http/HttpEntity？
【发布时间】：2014-05-05 11:28:41
【问题描述】：

当我尝试从该网站访问数据时，我正在尝试使用 Selenium 自动化从网站获取数据，但出现以下异常

run:
Starting ChromeDriver (v2.9.248315) on port 15621
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/http/entity/ContentType
    at org.openqa.selenium.remote.HttpCommandExecutor$EntityWithEncoding.<init>(HttpCommandExecutor.java:411)
    at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:306)
    at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:66)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:568)
    at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:240)
    at org.openqa.selenium.chrome.ChromeDriver.startSession(ChromeDriver.java:181)
    at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:126)
    at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:139)
    at org.openqa.selenium.chrome.ChromeDriver.<init>(ChromeDriver.java:160)
    at org.openqa.selenium.chrome.ChromeDriver.<init>(ChromeDriver.java:149)
    at org.openqa.selenium.chrome.ChromeDriver.<init>(ChromeDriver.java:106)
    at pocmandi.PocMandi.main(PocMandi.java:32)
Caused by: java.lang.ClassNotFoundException: org.apache.http.entity.ContentType
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    ... 12 more

这是我的鳕鱼

package pocmandi;

import com.gargoylesoftware.htmlunit.BrowserVersion;
import java.util.StringTokenizer;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.htmlunit.HtmlUnitDriver;
import org.openqa.selenium.support.ui.Select;
import java.sql.*;
import org.openqa.selenium.chrome.ChromeDriver;
public class PocMandi {

    Statement st = null;
    Connection cn = null;

    public static void main(String args[]) throws InterruptedException, ClassNotFoundException, SQLException {

        int j = 0;
        String htmlTableText = null;
        System.setProperty("webdriver.chrome.driver", "C:\\Users\\SHAKTI\\Desktop\\JarFiles\\chromedriver_win32\\chromedriver.exe");
        WebDriver driver = new ChromeDriver();
        String commodity = "Jo";
        String commo[] = {"Paddy", "Rice", "Jwar", "Barley", "Corn", "Wheat", "Jo", "Bejhar", "Jai", "Urad", "Moong", "Chana", "Matar"};
        for (String com : commo) {
            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(com);
            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"));
            // WebElement find=driver.findElement(By.id("ctl00_ContentPlaceHolder1_ddl_commodity"));
            htmlTableText = findElement.getText();
      //  String html=find.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]", "");
            htmlTableText = htmlTableText.replace("S.No. District Market Price", "");
            System.out.println(htmlTableText);

            String s[] = htmlTableText.split("");
            StringTokenizer str = new StringTokenizer(htmlTableText);
            while (str.hasMoreTokens()) // for(int i=0;i<s.length;i++)
            // if(str.hasMoreElements())
            {
                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 commoditydemo values(?,?,?,?,?,?)");
                ps.setString(1, no);
                ps.setString(2, city);
                ps.setString(3, mandi);
                ps.setString(4, price);
                ps.setString(5, com);
                ps.setString(6, "0");
                j = ps.executeUpdate();
                cn.close();

            }
        }
        driver.close();
        driver.quit();
        if (j == 1) {
            System.out.println("data inserted");
        } else {
            System.out.println("not inserted");
        }
    }
}

如何获取我的输出并删除此异常？

提前致谢

【问题讨论】：

您在类路径中缺少一些 jar，请检查您的 CP 设置
我添加了以下 jar
那么，只有 Chrome 驱动程序才会失败？
chrome 和 frifox 失败

标签： java selenium selenium-webdriver web-scraping

【解决方案1】：

为了检查您的代码，我尝试了以下方法：

@Test
public void test1() throws Exception {
    System.setProperty("webdriver.chrome.driver", "t:\\Others\\chromedriver.exe");
    WebDriver driver = new ChromeDriver();

    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("Paddy");
    Thread.sleep(5000);

    driver.findElement(By.id("ctl00_ContentPlaceHolder1_txt_rate")).sendKeys("27/03/2014");
    Thread.sleep(5000);

    driver.findElement(By.id("ctl00_ContentPlaceHolder1_btn_show")).click();
    Thread.sleep(5000);

    driver.close();

}

它适用于 FireFox (29.0) 和 Chrome (34.0) 驱动程序。我使用了以下 jar-s：

selenium-server-standalone-2.41.0.jar
selenium-java-2.41.0.jar
junit-dep-4.11.jar
hamcrest-core-1.3.jar

您应该检查您的项目构建路径并添加适当的 jar-s。但是如果你打开它，你可以在 selenium-server-standalone-2.XY.0.jar 中找到丢失的类文件：selenium-server-standalone-2.41.0.jar\org\apache\http\entity\ContentType

另一种方法是使用包含缺失类文件的 httpcore.jar (httpcore-4.3.jar)。

【讨论】：

【解决方案2】：

这实际上是因为您使用的是旧版本的 selenium java 绑定，我猜低于 2.40.0，因为这个 selenium 版本缺少 org/apache/http/entity/ContentType （内部）

所以有两种解决方案。

选项 1- 您希望保持 selenium 2.40.0 或更低

如果您希望保留旧的 selenium 2.40.0 或更低版本，那么您必须自己将缺少的 jar 添加到您的项目中，如果您使用的是 maven，则下面是依赖项。

<dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpcore</artifactId>
            <version>4.3</version>
</dependency> 
                     or

link to download the hhtpcore 4.3 jar

选项 2- 您可以将旧的 selenium 2.40.0 或更低版本更新为 2.53.0 或最新的 3.4.0

请更新到新的 selenium 版本，例如 selenium 2.53.0 或最新的 Selenium 3.4.0

<dependency>
    <groupId>org.seleniumhq.selenium</groupId>
    <artifactId>selenium-java</artifactId>
    <version>2.53.0</version>
</dependency>

link for the selenium jar 2.53.0

                    **or** 

 <dependency>
        <groupId>org.seleniumhq.selenium</groupId>
        <artifactId>selenium-java</artifactId>
        <version>3.4.0</version>
    </dependency>

【讨论】：