一个关于javaweb网页跳转的问题，求解

[15283506183]

这是报错

exception
 
javax.servlet.ServletException: Error instantiating servlet class com.servlet.Insert
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Thread.java:745)
root cause
 
java.lang.ClassNotFoundException: com.servlet.Insert
    org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1308)
    org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1142)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
    org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Thread.java:745)

这是代码

package com.Servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.bean.SqlBean;
import com.bean.JavaBean;

public class Insert extends HttpServlet {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	/**
	 * The doDelete method of the servlet. <br>
	 *
	 * This method is called when a HTTP delete request is received.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doDelete(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {

		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		   doPost(request,response);
		
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		request.setCharacterEncoding("utf-8");
		response.setCharacterEncoding("utf-8");
		//获取前台页面数据
		String name =request.getParameter("name");
		String password =request.getParameter("password");
		String sex =request.getParameter("sex");
		String sage = request.getParameter("age");
		int age  =Integer.parseInt(sage);
		
		//封装到JavaBean对象中去
		JavaBean jBean = new JavaBean();
		
		jBean.setName(name);
		jBean.setPassword(password);
		jBean.setSex(sex);
		jBean.setAge(age);
		
		//调用模型层
		String sql = "insert into TestNXSC(Name,Password,Sex,Age) values(?,?,?,?)";
		SqlBean  sBean = new SqlBean();
		int count =sBean.getInsert(sql,jBean);
		String url="";
		if(count>0)
		{
			url="SearchList.jsp";
		}
		else
		{
			url ="error.jsp";
			request.setAttribute("error", "错误！");
		}
		//转发ת
		request.getRequestDispatcher("SearchList.jsp").forward(request, response);
	}
}

[15283506183]

填好资料点击确定之后直接报错了

[qq_33252919]

Insert类没找到 java.lang.ClassNotFoundException: com.servlet.Insert

[15283506183]

引用 2 楼 qq_33252919 的回复:

Insert类没找到 java.lang.ClassNotFoundException: com.servlet.Insert

但我这里是有这个类的啊
附上web.xml代码

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
  <servlet>
    <servlet-name>Update</servlet-name>
    <servlet-class>com.Servlet.Update</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>SearchById</servlet-name>
    <servlet-class>com.Servlet.SearchById</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>Insert</servlet-name>
    <servlet-class>com.Servlet.Insert</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>Delete</servlet-name>
    <servlet-class>com.Servlet.Delete</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Update</servlet-name>
    <url-pattern>/Update</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>SearchById</servlet-name>
    <url-pattern>/SearchById</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>Insert</servlet-name>
    <url-pattern>/Insert</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>Delete</servlet-name>
    <url-pattern>/Delete</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>SearchList.jsp</welcome-file>
  </welcome-file-list>
</web-app>

[马七甲]

仔细检查下吧，com.servlet.Insert 这个配置的问题

[15283506183]

解决了 重启tomcat，然后复制地址到浏览器运行一下，再到eclipse运行就可以了 我不知道是为啥