一、宕机问题解决
准备两台Tomcat，当其中一台Tomcat挂掉（服务器宕机），便找另一台服务器继续运行
1、模拟宕机问题2、修改nginx.conf文件重启Nginx
Nginx解决跨域问题，实现方案：
:8080/a
:8081/b
如果在b工程的页面直接发送ajax请求a时会发生跨域问题，那么解决方案为：将A和B同时代理到Nginx，由Nginx做请求路由，直接在B工程页面中直接访问Nginx即可
package com.a;
import Javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet("/NginxServlet")
public class NginxServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1、接收数据
String username = request.getParameter("username");
System.out.println("接收的数据："+username);
//2、响应结果
response.getWriter().write("success");
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
}
4、index.jsp
<%--
Created by IntelliJ IDEA.
User: zheng
Date: 2020/2/10
Time: 15:01
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Nginx解决跨域问题</title>
<script type="text/javascript" src="https://www.linuxidc.com/js/jquery-1.8.3.min.js"></script>
<script>
$(function () {
$("#button").click(function () {
$.ajax({
url:"http://www.znzn.com/A/NginxServlet?username="+$("#username").val(),
type:"GET",
success:function (result) {
alert(result);
}
})
});
})
</script>
</head>
<body>
数据：<input type="text"/>
<input type="button" value="请求"/>
</body>
</html>
