手动编写一个Servlet类并运行

最新推荐文章于 2024-11-02 08:17:07 发布

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手动创建Servlet类包括在Tomcat的webapps目录下建立WEB工程，编写Java源文件，配置classpath环境变量，将servlet-api.jar加入到CLASSPATH，然后在web.xml中注册和映射Servlet，最后启动Tomcat服务器并通过浏览器访问验证。

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手动编写一个Servlet类需要以下几步：

（1）在D:\apache-tomcat-7.0.77\webapps\目录下新建一个WEB工程FirstProject，目录结构如下：

工程目录结构

（2）在classes目录下放置Java源文件FirstProject：

package it.cn;
import java.io.*;
import javax.servlet.*;

public class FirstProject extends GenericServlet{
	  public void service(ServletRequest request, ServletResponse

             response) throws ServletException, IOException{
		OutputStream out = response.getOutputStream();
		out.write("Hello Servlet!".getBytes());
		}


}

（3）编译java源文件为.class文件：

需要配置环境变量classpath, 将环境变量CLASSPATH的值设置为：
.;C:\Tomcat 5.5\common\lib\servlet-api.jar

常见问题见博客：http://www.cnblogs.com/michaelkai/archive/2013/07/05/3173786.html

（4）在web.xml中注册和映射Servlet

<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
  the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
-->
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                      http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
  version="3.0">
<servlet>
	<servlet-name>FirstProject</servlet-name>
	<servlet-class>it.cn.FirstProject</servlet-class>
</servlet>

<servlet-mapping>
	<servlet-name>FirstProject</servlet-name>
	<url-pattern>/FirstProject</url-pattern>
</servlet-mapping>
</web-app>