1.编写servlet: TreeDataServlet.java
package com.maggie.tree; import java.io.IOException; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; public class TreeDataServlet extends HttpServlet{ private String getData(){
StringBuffer sb = new StringBuffer();
sb.append("Hello~First Servlet!");
return sb.toString();
} @Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
// super.doGet(req, resp);
String data = this.getData();
resp.setContentType("text/html;charset=GBK");
resp.getOutputStream().write(data.getBytes("GBK"));
} @Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
// super.doPost(req, resp);
}
}
2.配置web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
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_2_5.xsd">
<servlet>
<servlet-name>treeServlet</servlet-name>
<servlet-class>
com.maggie.tree.TreeDataServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>treeServlet</servlet-name>
<url-pattern>/servlet/treeServlet</url-pattern>
</servlet-mapping>
</web-app>
不针对此例子，例如如下：
<servlet>
<description>任意</description>
<display-name>任意</display-name>
<servlet-name>ServletDemoFirst</servlet-name>
<servlet-class>cn.dragon.servlet.ServletDemoFirst</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ServletDemoFirst</servlet-name>
<url-pattern>/servlet/ServletDemoFirst</url-pattern>
</servlet-mapping>
① 上面的两个<servlet-name>必须相同
② <servlet-class>后面指在对应的类上面． 技巧：你可以直接在你的servlet类中复制过来，这样可以避免出错！
③ <url-pattern> 必须是/servlet 再加servlet名字.大家现在就这么记.
3.测试，访问地址：http://localhost:8080/fistServlet/treeServlet
页面显示如下：
Hello~First Servlet!
自己实例：
1：编写servlet：
package xjl; import java.io.IOException; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; public class TreeDataServlet extends HttpServlet{ private String getData(){
StringBuffer sb= new StringBuffer();
sb.append("Hello xjl World!");
return sb.toString();
} protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException{
// super.doGet(req, resp);一定要注释掉这句，否则会出错
String data=this.getData();
resp.setContentType("text/html;charset=GBK");
resp.getOutputStream().write(data.getBytes("GBK"));
} protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// super.doPost(req, resp);一定要注释掉这句，否则会出错
doGet(req, resp); } }
2 web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <servlet>
<servlet-name>TreeDataServlet</servlet-name>
<servlet-class>
xjl.TreeDataServlet
</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>TreeDataServlet</servlet-name>
<url-pattern>/servlet/xjl.TreeDataServlet</url-pattern>//注意这里url-pattern格式必须为：/servlet/包名.类名
</servlet-mapping>
</web-app>
3:访问：http://localhost:8080/helloworld/servlet/xjl.TreeDataServlet
Hello xjl World!