Tomcat访问Servlet页面报错404

王康伯巴奇 2018-12-27 12:20:47

如图。最近课程中刚学上Servlet，现在在宿舍里试着配置了一下发现不行。还需要截图什么信息请告知我，我马上补上

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御灵龍 2018-12-29

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eclipse与idea的代码编写应该是一样，<servlet>中添加<init-param>1<init-param>，这是访问servlet的时候的加载顺序。

程序员苍何 2018-12-29

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首先右键你的项目打开属性查看你的然后搜索web找到项目名是否一致，有可能不一致，404错误绝大多数就是访问的网址不存在，第二，检查端口号是否冲突，打开你的tomcat的安装目录在conf下的server.xml搜索8080，修改端口号试试，但一般情况下不会出现这种情况，因为你已经成功连接上服务器表明端口号不会出现错误，找错误的时候就奔着一点去找，我已经连接上服务器了，404表明服务器通过我的这个servlet—pattern找不到我这个servlet表明我的这个地址在服务器找不到，如果实在找不到你可以将项目共享给我，我在本机跑一下试试

楓VS痕 2018-12-28

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引用 6 楼 David_C_Java 的回复:

[quote=引用 2 楼楓VS痕的回复:]
http://127.0.0.1:8080/studentInfoManager/index.jsp
试试这个能访问么？你没修改 Tomcat的端口吧？

也不能访问。请问修改Tomcat端口在哪里修改[/quote]

你不知道，就应该是没有修改了，你是不是修改过项目名称？

王康伯巴奇 2018-12-28

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引用 3 楼楓VS痕的回复:

把 LoginServlet.java 的代码截图出来看一下

package view;

import java.io.IOException;
import java.io.PrintWriter;

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

public class LoginServlet extends HttpServlet {

	/**
	 * 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;charset=utf-8");
		PrintWriter out = response.getWriter();
		out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		out.print("    This is ");
		out.print(this.getClass());
		out.println(", using the GET method");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

	/**
	 * 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");
		PrintWriter out = response.getWriter();
		out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		out.print("    This is ");
		out.print(this.getClass());
		out.println(", using the POST method");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

}

这是整个LoginServlet里的代码，它自动生成的这些。我还没修改过

王康伯巴奇 2018-12-28