ajax入门实例

下面就ajax入门做了一个简单的实例：
下面我们就开始吧

第一步：导入我们需要的jqurery.js在这里和我们myeclipse中有所不同需要我们去到工程的目录下把jqurery.js复制在我们在web目录新建的jslib目录中，这个目录用来存放我们的.js文件 就是javascript脚本 jqurery.js封装了许多的js我们只需去调用就行

第二步：编写一个Servlet 在src目录中新建一个AJAXServer

public class AJAXServer extends HttpServlet{

     protected void doPost(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException {
        doGet(httpServletRequest, httpServletResponse);
    }

    protected void doGet(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException {
        try{
//            request.setCharacterEncoding("UTF-8");
//            response.setContentType("text/html;charset=gb18030");

            httpServletResponse.setContentType("text/html;charset=utf-8");
            PrintWriter out = httpServletResponse.getWriter();

            Integer inte = (Integer) httpServletRequest.getSession().getAttribute("total");
            int temp = 0;
            if (inte == null) {
                temp = 1;
            } else {
                temp = inte.intValue() + 1;
            }
            httpServletRequest.getSession().setAttribute("total",temp);

            //1.取参数
            String old = httpServletRequest.getParameter("name");
            //String name = new String(old.getBytes("iso8859-1"),"UTF-8");
             String name=null;
            if(!old.equals("") && (old != null))
            {
                 name = URLDecoder.decode(old,"UTF-8");
            }
            //2.检查参数是否有问题
            if(old == null || old.length() == 0){
                out.println("用户名不能为空");
            } else{
//                String name = URLDecoder.decode(old,"UTF-8");
//                byte[] by = old.getBytes("ISO8859-1");
//                String name = new String(by,"utf-8");
//                String name = URLDecoder.decode(old,"u