编写了一个简单的Servlet，HelloWorld.java
package test;
import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class HelloWorld extends HttpServlet
{
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws IOException,ServletException
{
response.setContentType( "text/html ");
PrintWriter out = response.getWriter(); out.println( " <html> ");
out.println( " <head> ");
out.println( " <title> HelloWorld </title> ");
out.println( " </head> ")
out.println( " <body> HelloWorld </body> ");
out.println( " </html> ");
}
}
环境变量
JAVA_HOME=C:\j2sdk1.4.2_13
CATALINA_HOME=C:\Program Files\Apache Software Foundation\Tomcat 5.0
CLASSPATH=C:\j2sdk1.4.2_13\lib\dt.jar;C:\j2sdk1.4.2_13\lib\tool.jar;C:\j2sdk1.4.2_13\lib\tools.jar;C:\Program Files\Apache Software Foundation\Tomcat 5.0\common\lib\servlet-api.jar;C:\Program Files\Apache Software Foundation\Tomcat 5.0\common\lib\jsp-api.jar
Path=C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\j2sdk1.4.2_13\bin
将编译完后的HelloWorld.class放入%CATLINA_HOME%\webapps\servlet\WEB-INF\classses\test\目录下
并且修改了servlet\WEB-INF\下的web.xml
<?xml version= "1.0 " encoding= "ISO-8859-1 "?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN "
"http://java.sun.com/dtd/web-app_2_3.dtd ">
<web-app>
<display-name> my program </display-name>
<description>
test
</description>
<servlet>
<servlet-name> HelloWorld </servlet-name>
<display-name> HelloWorld </display-name>
<description> A test Servlet </description>
<servlet-class> test.HelloWorld </servlet-class>
</servlet>
<servlet-mapping>
<servlet-name> HelloWorld </servlet-name>
<url-pattern> /HelloWorld </url-pattern>
</servlet-mapping>
</web-app>
重新启动Tomcat,但是在浏览器中输入http://127.0.0.1:8080/webapps/servlet/HelloWorld
出现下面的错误
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Wrapper cannot find servlet class test.HelloWorld or a class it depends on
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)