方法1：单一方法请求servlet

1、创建Servlet

@WebServlet("/HelloForm")
public class HelloForm extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public HelloForm() {
super();
// TODO Auto-generated constructor stub
}

   /**
   * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
   */
   protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       // 设置响应内容类型
       response.setContentType("text/html;charset=GBK");
       System.out.println("---HelloForm----doGet-------");
       PrintWriter out = response.getWriter();
       String title = "使用 GET 方法读取表单数据";
       // 处理中文
       String name =new String(request.getParameter("name"));
       String docType = "<!DOCTYPE html> \n";
       out.println(docType +
       "<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>："
       + name + "\n" +
       " <li><b>网址</b>："
       + request.getParameter("url") + "\n" +
       "</ul>\n" +
       "</body></html>

2、配置servlet——在web.xml文件里面配置

<servlet>
<servlet-name>HelloForm</servlet-name>
<servlet-class>lgq.action.HelloForm</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloForm</servlet-name>
<url-pattern>/TomcatTest/HelloForm</url-pattern>
</servlet-mapping>

3、jsp表单访问servlet

方法2：多方法servlet

1、创建servlet类

public class ServletInAJAX extends HttpServlet {
   private static final long serialVersionUID = 1L;
   private MyInterface dao = new MyInterfaceImpl();
private MyTable table = new MyTable();
private PageBean pageBean= new PageBean();

   /**
   * Constructor of the object.
   */
   public ServletInAJAX() {
       super();
   }

   /**
   * Destruction of the servlet. <br>
   */
   public void destroy() {
       super.destroy(); // Just puts "destroy" string in log
       // Put your code here
   }

   public void doPost(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException {
           System.out.println("-------doPost-------"+request.getParameter("method"));

this.doGet(request, response);
   }


   public void doGet(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException {
       System.out.println("-------doGet-------");
       //查询
       if(request.getParameter("method").equals("lgqtest")){
           List<String> list = new ArrayList<String>();
           String msg = "";
           msg ="测试接口啦";
           list.add(msg);
           response.getWriter().print(new JSONObject().element("msg",list));
       }

   }

/**
   * Initialization of the servlet. <br>
   *
   * @throws ServletException if an error occurs
   */
   public void init() throws ServletException {
       // Put your code here
   }

}

2、配置servlet

   <servlet>
       <servlet-name>action1</servlet-name>
       <servlet-class>
           lgq.action.ServletInAJAX
       </servlet-class>
   </servlet>

       <servlet-mapping>
       <servlet-name>action1</servlet-name>
       <url-pattern>/testa</url-pattern>
   </servlet-mapping>

3、访问servlet

创建jQuery方法

                  $("#testb1").text(url);
                  $("#data1").text(data);

          $.ajax({
   url:"/Helloworld/testa?method=lgqtest",
   type:"get",
   dataType:"json",
   success:function(data){
       console.info("我的我的我的我三方第三方");
       console.debug("我的我的我的我ugaaaaaaaaa");
       console.log(data);

       $('#alert_div div:eq(1)')
                          .text(''+data.msg).css('color','red');
                          $('#alert_div').fadeIn('150');
       /* alert(data.msg); */

   }
   });

              });

});

标签点击调用jQuery 方法

<button type="button" id="btn">Login</button>

web项目Servlet配置及jsp访问Servlet