说明源服务器未找到目标资源的当前表示或不愿公开存在该表示

Question

package com.luv3code.testdb;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class TestDBServlet
 */
@WebServlet("/TestDbServlet")
public class TestDBServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        String user="springstudent";
        String pass="springstudent";
        String jdbcUrl= "jdbc:mysql://localhost:3306/web_customer_tracker?useSSL&serverTimezome=UTC";

        String driver= "com.mysql.cj.jdbc.Driver";

        try {
            PrintWriter out=response.getWriter();
            out.println("Connect to Database: " +jdbcUrl);
            Class.forName(driver);
            Connection myConn= DriverManager.getConnection(jdbcUrl, user, pass);
            out.println("suceess");

        }catch(Exception exc) {
            exc.printStackTrace();
            throw new ServletException(exc);
        }
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

}

我创建了一个连接spring学生：与用户spring学生。除了在我的 workbench.

上用 table 创建一个数据库

我想在我的数据库上连接我的 eclipse 项目。所以我编写代码并添加一个库。

我的步数：

下载apachetomcat

创建网络动态项目。创建一个servlet 添加库我的-sql-8.0.12

Java编译器，Java构建路径，Project Facest版本相同

我尝试运行进行以上两项设置：服务器右键单击优先级：工作区元数据服务器右键单击优先级：本地

删除并添加服务器(Window->Show Servers...) 检查项目 facets->运行点击 apache 的时间清理项目清理服务器

删除并再次导入项目。

控制台：

Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.startup.VersionLoggerListener log INFO: Server version name: Apache Tomcat/9.0.35 Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.startup.VersionLoggerListener log INFO: Server built: May 5 2020 20:36:20 UTC Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.startup.VersionLoggerListener log INFO: Server version number: 9.0.35.0 Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.startup.VersionLoggerListener log INFO: OS Name:
Windows 10 Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.startup.VersionLoggerListener log INFO: OS Version: 10.0 Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.startup.VersionLoggerListener log INFO: Architecture: amd64 Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.startup.VersionLoggerListener log INFO: Java Home: C:\Program Files\Java\jdk1.8.0_251\jre Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.startup.VersionLoggerListener log INFO: JVM Version: 1.8.0_251-b08 Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.startup.VersionLoggerListener log INFO: JVM Vendor: Oracle Corporation Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.startup.VersionLoggerListener log INFO: CATALINA_BASE:
C:\Users\User\eclipse-workspace.metadata.plugins\org.eclipse.wst.server.core\tmp1 Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.startup.VersionLoggerListener log INFO: CATALINA_HOME: C:\Program Files\Apache Software Foundation\Tomcat 9.0 Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.startup.VersionLoggerListener log INFO: Command line argument: -Dcatalina.base=C:\Users\User\eclipse-workspace.metadata.plugins\org.eclipse.wst.server.core\tmp1 Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.startup.VersionLoggerListener log INFO: Command line argument: -Dcatalina.home=C:\Program Files\Apache Software Foundation\Tomcat 9.0 Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.startup.VersionLoggerListener log INFO: Command line argument: -Dwtp.deploy=C:\Users\User\eclipse-workspace.metadata.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.startup.VersionLoggerListener log INFO: Command line argument: -Djava.endorsed.dirs=C:\Program Files\Apache Software Foundation\Tomcat 9.0\endorsed Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.startup.VersionLoggerListener log INFO: Command line argument: -Dfile.encoding=Cp1253 Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.core.AprLifecycleListener lifecycleEvent INFO: Loaded Apache Tomcat Native library [1.2.24] using APR version [1.7.0]. Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.core.AprLifecycleListener lifecycleEvent INFO: APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true]. Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.core.AprLifecycleListener lifecycleEvent INFO: APR/OpenSSL configuration: useAprConnector [false], useOpenSSL [true] Ιουν 14, 2020 1:57:58 ΠΜ org.apache.catalina.core.AprLifecycleListener initializeSSL INFO: OpenSSL successfully initialized [OpenSSL 1.1.1g 21 Apr 2020] Ιουν 14, 2020 1:57:59 ΠΜ org.apache.coyote.AbstractProtocol init INFO: Initializing ProtocolHandler ["http-nio-8081"] Ιουν 14, 2020 1:58:00 ΠΜ org.apache.catalina.startup.Catalina load INFO: Server initialization in [2,379] milliseconds Ιουν 14, 2020 1:58:00 ΠΜ org.apache.catalina.core.StandardService startInternal INFO: Starting service [Catalina] Ιουν 14, 2020 1:58:00 ΠΜ org.apache.catalina.core.StandardEngine startInternal INFO: Starting Servlet engine: [Apache Tomcat/9.0.35] Ιουν 14, 2020 1:58:02 ΠΜ org.apache.jasper.servlet.TldScanner scanJars INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time. Ιουν 14, 2020 1:58:03 ΠΜ org.apache.coyote.AbstractProtocol start INFO: Starting ProtocolHandler ["http-nio-8081"] Ιουν 14, 2020 1:58:03 ΠΜ org.apache.catalina.startup.Catalina start INFO: Server startup in [2,449] milliseconds

HTTP Status 404 – Not Found

Type Status Report

Message The requested resource [/web-customer-tracker/] is not available

Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.

我有两台电脑，第一台运行程序如果改变 @WebServlet("/") 我无法解释为什么。在这里它没有运行.

我还重新安装了 eclipse 和 tomcat。日蚀 2019 阿帕奇 9 java 版本“1.8.0_251” Java(TM) SE 运行时环境（build 1.8.0_251-b08） Java HotSpot(TM) 64 位服务器 VM（内部版本 25.251-b08，混合模式）

有人可以帮助我吗？

Answer 1

只需右键单击您的 servlet 并选择 Run As > Run on Server。

说明源服务器未找到目标资源的当前表示或不愿公开存在该表示

Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists

java

tomcat

servlets

http-status-code-404

说明 源服务器未找到目标资源的当前表示或不愿公开存在该表示

Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists

java

tomcat

servlets

http-status-code-404

说明源服务器未找到目标资源的当前表示或不愿公开存在该表示