工程配置

create new project，选择 Java Enterprise 然后配置JDK，Tomcat，选择Web Aplication，注意要勾选 Creat web.xml

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因为IDEA不像Eclipse会自动创建classes和lib文件夹，需要我们手动创建并指定（注意要指定）

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编辑 Tomcat 配置

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代码测试

新建一个 HelloServlet 文件

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代码如下：

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class HelloServlet extends HttpServlet {
    //处理 get 方法
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");

        PrintWriter out = response.getWriter();
        String title = "使用 GET 方法读取表单数据";
        out.println(
                "<!DOCTYPE html>\n" +
                        "<html>\n" +
                        "<head><title>" + title + "</title></head>\n" +
                        "<body bgcolor=\"#f0f0f0\">\n"+
                        "<h1 align=\"center\">" + title + "</h1>\n" +
                        "<ul>\n" +
                        " <li><b>站点名</b>:" + request.getParameter("name") + "\n" +
                        "<li><b>网站</b>:" + request.getParameter("url") + "\n" +
                        "</ul>\n" +
                        "</body></html>");
    }
    //处理 post 方法
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doGet(request, response);
    }
}

修改 web.xml 中的 servlet 路径配置在内部增加下述路径

    <servlet>
        <servlet-name>helloServlet</servlet-name>
        <servlet-class>HelloServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>helloServlet</servlet-name>
        <url-pattern>/hello</url-pattern>
    </servlet-mapping>