Ajax与Servlet ,Tomcat结合分析与测试 -

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Ajax与Servlet ,Tomcat结合分析与测试

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Ajax分析与测试系列

Ajax 分析与测试 Tomcat

<script type='text/javascript'>
		//实现功能，对用户名是否被注册进行验证
		//验证时间onblur
		//服务器是tomacat与servlet结合作为服务器端
		//浏览器在ff与chrome下测试，版本应就是近期才装的
		//服务器端假设各位已会
		
		//ajax函数
		var ajax=function(url){
			var xhr=null;
			if(window.XMLHttpRequest){
				xhr=new XMLHttpRequest();
			}else{
				xhr=new ActiveXObject("Microsoft.XMLHTTP");
			}
			xhr.open("get", url, true);
			xhr.send();
			xhr.onreadystatechange=function(){
				if(xhr.readyState==4 && xhr.status==200){
					//console.info(xhr.responseText);
					//console.info(xhr.responseXML);//为null
					alert(xhr.responseText);
				}
			};
		};
		window.onload=function(){
			var oInputs=document.getElementsByTagName('input');
			var url="AjaxServlet?userName="+oInputs[0].value;
			oInputs[0].onblur=function(){
				
				ajax(url);
			};
		};
	</script>
  </head>
  
  <body>
  	<form action="">
  		 userName<input type="text" name="userName"/><br/>
    		 password<input type='text' name="passWord"/>
   </form>
  </body>

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		response.setCharacterEncoding("UTF-8");
		String s1=request.getParameter("userName");
		if(s1.equals("userName")){
			PrintWriter out = response.getWriter();
			out.print("名字相同111");
			out.flush();
			out.close();
		}else{
			PrintWriter out = response.getWriter();
			out.print("success");
			out.flush();
			out.close();

		}
	}

 <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>AjaxServlet</servlet-name>
    <servlet-class>hyl.AjaxServlet</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>AjaxServlet</servlet-name>
    <url-pattern>/AjaxServlet</url-pattern>
  </servlet-mapping>	
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>

//给上结果图