1.配置Tomcat 7
1.1添加3个系统变量
- CATALINA_HOME D:\apache-tomcat-7.0.70
- CATALINA_BASE D:\apache-tomcat-7.0.70
- TOMCAT_HOME D:\apache-tomcat-7.0.70
2.在Eclipse中创建Servers
2.1在Eclipse中创建一个Dynamic web project
*该步骤选中tomcat 7+servlet 3.0的配置
2.2.1创建class继承自 HttpServlet
package servletHello;
import java.io.IOException;
import java.io.PrintWriter;
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;
@WebServlet(name="Servlet01",urlPatterns="/hello")
public class HelloServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
System.out.println("dasdsdsa");
//super.doGet(req, resp);
resp.setContentType("text/html;charset=UTF-8");
PrintWriter out =resp.getWriter();
out.println("<html>");
out.println("<body><h1>hello servlet</h1></body>");
out.println("</html>");
}
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet(name="Servlet01",urlPatterns="/hello")
public class HelloServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
System.out.println("dasdsdsa");
//super.doGet(req, resp);
resp.setContentType("text/html;charset=UTF-8");
PrintWriter out =resp.getWriter();
out.println("<html>");
out.println("<body><h1>hello servlet</h1></body>");
out.println("</html>");
}
}
2.2配置Servlet
这里可以选择保留自动创建一个Web.xml在web-inf中，从而可以用老的手段来配置servlet,如下：
比较：相对于web.xml中的配置，需要如下代码：
<servlet>
<servlet-name>Hello</servlet-name>
<servlet-class>servletHello.HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Hello</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
但在tomcat 7以上+servlet 3.0中可以直接用注解来配置servlet，如下
@WebServlet(name="Servlet01",urlPatterns="/hello")
public class HelloServlet extends HttpServlet {
public class HelloServlet extends HttpServlet {
.....}
在WebServlet中有一堆属性，可以用来与web.xml中配置servlet做一样的事情
部分属性如下：
（本图转自点击打开链接）
如此配置完成之后再浏览器中直接进入
http://localhost:8080/servlet/hello
此时会出现错误405,因为在类HellpServlet中重写doGet时先调用了父类的doGet,把导致执行doGet时转跳到父类的doGet里去了，此时把父类的doGet注释掉
//super.doGet(req, resp);
刷新页面，doGet执行即在页面中写了