Question

我正在关注Head First Java。

我按照他们的指示创建了一个简单的servlet，但他们没有编写如何部署它。

我正在尝试在Tomcat 7上部署它，我已经通过eclipse进行了设置。

但是我得到了404页错误。

我创建了一个web.xml，我还将类文件放在WEB-INF / classes中。

这是代码。

package org.code;

import java.io.*;

import javax.servlet.*;
import javax.servlet.http.*;

public class KathyServlet extends HttpServlet { 

public void doGet (HttpServletRequest request, HttpServletResponse response) throws  ServletException, IOException  {
 PrintWriter out;
 String title = "PhraseOMatic has generated the following phrase.";
     response.setContentType("text/html");
 out = response.getWriter();

    out.println("<HTML><HEAD><TITLE>");
out.println("PhraseOmatic");
out.println("</TITLE></HEAD><BODY>");
out.println("<H1>" + title + "</H1>");
out.println("<P>" + PhraseOMatic2.makePhrase());
    out.println("<P><a href=\"KathyServlet\">make another phrase</a></p>");
out.println("</BODY></HTML>");

out.close();
}
}

其他java代码文件：

package org.code;

public class PhraseOMatic2 {
public static String makePhrase() {

 // make three sets of words to choose from
String[] wordListOne = {"24/7","multi-Tier","30,000 foot","B-to-B","win-win","front-     end", "web-based","pervasive", "smart", "six-sigma","critical-path", "dynamic"};

String[] wordListTwo = {"empowered", "sticky", "valued-added", "oriented", "centric", "distributed", "clustered", "branded","outside-the-box", "positioned", "networked", "focused", "leveraged", "aligned", "targeted", "shared", "cooperative", "accelerated"};

String[] wordListThree = {"process", "tipping point", "solution", "architecture", "core competency", "strategy", "mindshare", "portal", "space", "vision", "paradigm", "mission"};

// find out how many words are in each list
int oneLength = wordListOne.length;
int twoLength = wordListTwo.length;
int threeLength = wordListThree.length;

// generate three random numbers, to pull random words from each list
int rand1 = (int) (Math.random() * oneLength);
int rand2 = (int) (Math.random() * twoLength);
int rand3 = (int) (Math.random() * threeLength);

// now build a phrase
String phrase = wordListOne[rand1] + " " + wordListTwo[rand2] + " " +    wordListThree[rand3];

// now return it
return ("What we need is a " + phrase);
} 
}

的web.xml：

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
<display-name>HFJse</display-name>
<servlet>
<servlet-name>kathyServlet</servlet-name>
<servlet-class>org.yasin.KathyServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>KathyServlet</servlet-name>
<url-pattern>/snoop/*</url-pattern>
</servlet-mapping>
</web-app>

Answer 1

我们的servlet calss位于包org.code中，但您在web.xml中设置的类名是org.yasin.KathyServlet。

此外，您在web.xml中为您的servlet指定了名称kathyServlet，但您的映射使用名称KathyServlet。 Servlet名称区分大小写。

Answer 2

如果该代码是正确的，那么web.xml就不好了。您正在使用以下命令定义servlet类：

<强> org.yasin.KathyServlet

你的Servlet是：

<强> org.code.KathyServlet

您在web.xml中使用的Servlet需要指向正确的包和Sevlet名称。

您应该在tomcat日志中看到与您的404错误关联的ClassNotFound。

在Tomcat eclipse上部署简单的Servlet

2 个答案: