一个关于javaweb网页跳转的问题，求解

2016-04-07 02:48:45 273 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

JavaWEB【页面跳转方式&JDBC交互】一、页面跳转方式表单提交的两种方式以及区别？ get:数据会显示在地址栏上，数据量小，安全性低 post：相反。request可以接收哪两种方式的值？ ①通过form表单 ②通过超链接传值 <a href = "a.jsp?username=admin&password=123">跳转到a.jsp获取</a> js的跳转属于哪一种？ out.print("<script>alert('账号或密码错误');location.href='... 阅读详情

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);

	}

}

...全文

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15283506183 2016-04-07

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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

马七甲 2016-04-07

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仔细检查下吧，com.servlet.Insert 这个配置的问题

15283506183 2016-04-07

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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>

qq_33252919 2016-04-07

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

15283506183 2016-04-07

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填好资料点击确定之后直接报错了

一个关于javaweb网页跳转的问题，求解

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