我是servlet的新手，我正在测试我的第一个servlet程序但是它给出了HTTP STATUS 404错误。我所做的事情是：
1＆GT;安装java-＆gt; C：\ Program Files \ Java \ jdk1.6.0
2 - ;安装Tomcat-＆gt; C：\ Apache的Tomcat的7.0
3＆GT;当我输入 - ＆gt; localhost：8080在浏览器中工作正常。
4＆GT;我创建的文件夹的目录 - ＆gt; C：\ Apache的Tomcat的7.0.23 \ web应用\实例
它包含一个web.xml文件和WEB-INF文件夹。
在WEB-INF中，有一个名为classes的文件夹，其中包含validate.class
我的java文件'validate.java'的Souce代码如下 -
import javax.servlet.http.*;
import javax.servlet.*;
import java.io.*;
import java.lang.*;
public class validate extends HttpServlet{
public void service(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException{
String name=req.getParameter("tb");
String pass=req.getParameter("pass");
String name1=getInitParameter("usrnme1");
String pass1=getInitParameter("pswrd1");
Cookie c1=new Cookie(name1,pass1);
res.addCookie(c1);
String name2=getInitParameter("usrnme2");
String pass2=getInitParameter("pswrd2");
Cookie c2=new Cookie(name2,pass2);
res.addCookie(c2);
String name3=getInitParameter("usrnme3");
String pass3=getInitParameter("pswrd3");
Cookie c3=new Cookie(name3,pass3);
res.addCookie(c3);
String name4=getInitParameter("usrnme4");
String pass4=getInitParameter("pswrd4");
Cookie c4=new Cookie(name4,pass4);
res.addCookie(c4);
res.setContentType("text/html");
PrintWriter out=res.getWriter();
Cookie[] c=req.getCookies();
if(c!=null)
{
for(int i=0;i<c.length;i++)
{
if(c[i].getName()==name && c[i].getValue()==pass)
{
out.println("<html><body><center>");
out.println("Hello"+"<b>c[i].getName()</b>");
out.println("</center></body></html>");
break;
}
else
{
out.println("<html><body><center>");
out.println("Not a Valid USER");
out.println("</center></body></html>");
break;
}
}
}
}
}
web.xml文件代码 -
<?xml version="1.0"?>
<web-app>
<servlet>
<servlet-name>validate</servlet-name>
<servlet-class>validate</servlet-class>
</servlet>
<init-param>
<param-name>usrnme1</param-name>
<param-value>user1</param-value>
</init-param>
<init-param>
<param-name>pswrd1</param-name>
<param-value>pwd1</param-value>
</init-param>
<init-param>
<param-name>usrnme2</param-name>
<param-value>user2</param-value>
</init-param>
<init-param>
<param-name>pswrd2</param-name>
<param-value>pwd2</param-value>
</init-param>
<init-param>
<param-name>usrnme3</param-name>
<param-value>user3</param-value>
</init-param>
<init-param>
<param-name>pswrd3</param-name>
<param-value>pwd3</param-value>
</init-param>
<init-param>
<param-name>usrnme4</param-name>
<param-value>user4</param-value>
</init-param>
<init-param>
<param-name>pswrd4</param-name>
<param-value>pwds4</param-value>
</init-param>
<servlet-mapping>
<servlet-name>validate></servlet-name>
<url-pattern>/validate</url-pattern>
</servlet-mapping>
</web-app>
在阅读了一些建议后，我尝试将url更改为/validate.htm（或.html），但仍然收到相同的错误消息。
HTTP Status 404 - /examples/validate.html
type Status report
message /examples/validate.html
description The requested resource (/examples/validate.html) is not available.
Apache Tomcat/7.0.27
******************************************************
Log file catalina.2015-04-22 is-
Apr 22, 2015 9:08:18 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal
performance in production environments was not found on the java.library.path:
C:\Program Files (x86)\Apache Software Foundation\Tomcat
7.0\bin;.;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\ProgramData\
Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\
Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files
(x86)\Java\jdk1.8.0_31\bin;C:\Program Files
(x86)\Java\jre1.8.0_31\bin;C:\TurboC++\Disk\TurboC3\BIN;C:\Program Files
(x86)\Skype\Phone\;C:\Program Files (x86)\Java\jdk1.6.0_25\bin;C:\Program Files
(x86)\Java\jre6\bin;C:\Program Files (x86)\Apache Software Foundation\Tomcat
7.0\lib;
Apr 22, 2015 9:08:18 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Apr 22, 2015 9:08:18 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Apr 22, 2015 9:08:18 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 495 ms
Apr 22, 2015 9:08:19 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Apr 22, 2015 9:08:19 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.27
Apr 22, 2015 9:08:19 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory C:\Program Files (x86)\Apache Software Foundation\Tomcat 7.0\webapps\docs
Apr 22, 2015 9:08:19 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory C:\Program Files (x86)\Apache Software Foundation\Tomcat 7.0\webapps\examples
Apr 22, 2015 9:08:19 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory C:\Program Files (x86)\Apache Software Foundation\Tomcat 7.0\webapps\host-manager
Apr 22, 2015 9:08:19 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory C:\Program Files (x86)\Apache Software Foundation\Tomcat 7.0\webapps\manager
Apr 22, 2015 9:08:19 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory C:\Program Files (x86)\Apache Software Foundation\Tomcat 7.0\webapps\ROOT
Apr 22, 2015 9:08:19 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
Apr 22, 2015 9:08:19 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Apr 22, 2015 9:08:19 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 785 ms
Apr 22, 2015 9:12:20 PM org.apache.catalina.startup.HostConfig checkResources
INFO: Reloading context [/examples]
Apr 22, 2015 9:12:24 PM org.apache.catalina.startup.HostConfig checkResources
WARNING: Error during context [/examples] restart
org.apache.catalina.LifecycleException: Failed to start component
[StandardEngine[Catalina].StandardHost[localhost].StandardContext[/examples]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at
org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1366)
at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1454)
at
org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:295)
at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at
org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at
org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1379)
at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChild
ren(ContainerBase.java:1537)
at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChild
ren(ContainerBase.java:1547)
at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(Containe
rBase.java:1526)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalArgumentException: Servlet mapping specifies an
unknown servlet name hai>
at
org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:
3204)
at
org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:
3183)
at org.apache.catalina.deploy.WebXml.configureContext(WebXml.java:1302)
at
org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1294)
at
org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:855)
at
org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:345)
at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.ja
va:119)
at
org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5161
)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 10 more
Apr 22, 2015 9:37:00 PM org.apache.catalina.startup.HostConfig checkResources
INFO: Reloading context [/examples]
Apr 22, 2015 9:37:04 PM org.apache.catalina.startup.HostConfig checkResources
WARNING: Error during context [/examples] restart
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/examples]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1366)
at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1454)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:295)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1379)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1537)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1547)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1526)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.IllegalArgumentException: Servlet mapping specifies an unknown servlet name validate>
at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3204)
at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java: 3183)
at org.apache.catalina.deploy.WebXml.configureContext(WebXml.java:1302)
at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1294)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:855)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:345)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5161)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 10 more
请尽快帮助我。我非常感谢你。