AJAX使用笔记
1、AJAX是什么?AJAX是一种异步的数据交换技术,需要在前端、后端都进行编写代码
使用AJAX之前,需要配置两个文件,一个是axios文件,一个是JSON配置文件
<script src="js/axios-1 0.18.0.js"></script>
其中JSON配置,使用POM.xml中引入
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.62</version>
</dependency>
2、在后端实现需要定义一个用于接收请求的servlet,如
@WebServlet(name = "AxiosServlet", value = "/AxiosServlet")
public class AxiosServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("get....");
String username = request.getParameter("username");
System.out.println(username);
response.getWriter().write("hello axios");
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("post....");
this.doGet(request, response);
}
}
3、在前端需要引入js文件,发送ajax请求
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<script src="js/axios-0.18.0.js"></script>
<script>
axios({
method:"post",
url:"http://localhost:8080/brand-demo/AxiosServlet",
data:"username=zhangsan"
}).then(function(resp){
alert(resp.data);
})
</script>
</body>
</html>
以上只是一个示例

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