本篇文章
環境：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
知識點：java + servlet + tomcat
創建web工程方法
1. File --- new --- Dynamic Web Project
看圖說話：
a. 填寫web工程名：First
b. 點擊“New Runtime...“，”選擇“Apache Tomcat v8.0”(PS：由於Eclipse luna最大支持 Apache Tomcat v8.0，所以PC端最大只能安裝tomcat v8版本，不支持v9)
c. 點擊"Next"
然后如下：
a. 選擇tomcat 在本地的位置
b. 選擇"JRE"
c. 點擊finish
然后如下：
點擊“Next”
點擊“Next”
勾選“Generate web.xml ...”，這樣，可以自動生成web.xml文件，點擊“finish”按鈕
項目創建完成：
2. 創建servlet
點擊“Next”
點擊“Next”
直接點擊“finish”
修改 ServletDemo1.java文件，內容如下：
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 文件為：
<?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>
備注：上面高亮部分的名稱要一致
4. 開始部署
直接點擊“finish”按鈕，如下(雖然出現Not Found，此時不要擔心，還沒開始運行servlet 呢，繼續往下看)：
5. 運行servlet
選中“ServletDemo1”--- 右鍵 --- Run As --- Run on Server
點擊“finish”按鈕，運行效果如下，成功！
PS:
2.打印log方法：
方法一：
將 commons-logging-1.1.1.jar 拷貝到 libs文件夾：
private static Log log1 = LogFactory.getLog(ServletDemo1.class);
doGet方法內加入：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：
然后在瀏覽器輸入：http://localhost:8080/First/test/ServletDemo1，回車后，可以看到日志輸出