本篇文章
环境：win7 + jdk1.7 + tomcat v8.0.53
工具：
1.Eclipse
Eclipse Java EE IDE for Web Developers.
Version: Luna Service Release 2 (4.4.2)
Build id: 20150219-0600
2. tomcat v8.0.53
http://mirrors.hust.edu.cn/apache/tomcat/tomcat-8/v8.0.53/bin/apache-tomcat-8.0.53-windows-x64.zip --- 64位
http://mirrors.hust.edu.cn/apache/tomcat/tomcat-8/v8.0.53/bin/apache-tomcat-8.0.53-windows-x86.zip --- 32位
知识点：java + servlet + tomcat
创建web工程方法
1. File --- new --- Dynamic Web Project
看图说话：
a. 填写web工程名：First
b. 点击“New Runtime...“，”选择“Apache Tomcat v8.0”(PS：由于Eclipse luna最大支持 Apache Tomcat v8.0，所以PC端最大只能安装tomcat v8版本，不支持v9)
c. 点击"Next"
然后如下：
a. 选择tomcat 在本地的位置
b. 选择"JRE"
c. 点击finish
然后如下：
点击“Next”
点击“Next”
勾选“Generate web.xml ...”，这样，可以自动生成web.xml文件，点击“finish”按钮
项目创建完成：
2. 创建servlet
点击“Next”
点击“Next”
直接点击“finish”
修改 ServletDemo1.java文件，内容如下：
package com.servlet.demo;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class ServletDemo1
*/
@WebServlet(asyncSupported = true, urlPatterns = { "/ServletDemo1" })
public class ServletDemo1 extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* 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");
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();
}
}
3. 修改web.xml 文件为：
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>ServletDemo1</servlet-name>
<servlet-class>com.servlet.demo.ServletDemo1</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ServletDemo1</servlet-name>
<url-pattern>/test/ServletDemo1</url-pattern>
</servlet-mapping>
</web-app>
备注：上面高亮部分的名称要一致
4. 开始部署
直接点击“finish”按钮，如下(虽然出现Not Found，此时不要担心，还没开始运行servlet 呢，继续往下看)：
5. 运行servlet
选中“ServletDemo1”--- 右键 --- Run As --- Run on Server
点击“finish”按钮，运行效果如下，成功！
PS:
2.打印log方法：
方法一：
将 commons-logging-1.1.1.jar 拷贝到 libs文件夹：
private static Log log1 = LogFactory.getLog(ServletDemo1.class);
doGet方法内加入：log1.info("!!!!");
方法二：
System.out.println("xxx");
方法三：
getServletContext().log("xxx");
注意：加入log日志后，如果log不生效，clean下工程：
然后在浏览器输入：http://localhost:8080/First/test/ServletDemo1，回车后，可以看到日志输出