NGINX配置文件思路就是当客户端访问tomcat（因为其就是一个服务器）的时候， 就会产生一个sessionid，可以作为key存到redis，value可以是个user，集合等， 我用的是用户，因为负载均衡，当我再次发送请求的时候不一定访问的是当前的tomcat， 可能是另一个tomcat，因为在访问不同的服务器的时候，会产生不同的sessionid， 其存是需要解决的，所以我就将在第一次访问的时候就产生的sessionid存到cookie里， 再次访问的时候因为cookie是存在客户端的，取出cookie里的sessionid， 用此sessionid取出redis里第一次访问存的用户名与这次访问的用户名做比较，如果相同直接进行连接。
user root; #用户名
worker_processes 3;
pid logs/nginx.pid;
# [ debug | info | notice | warn | error | crit ]
error_log /usr/local/nginx/logs/error.log info;#与自己文件目录一样
events {
worker_connections 1024;
# use [ kqueue | rtsig | epoll | /dev/poll | select | poll ] ;
# 具体内容查看 http://wiki.codemongers.com/事件模型
use epoll;
}
http {
include mime.types;
default_type application/octet-stream;
log_format main '$remote_addr - $remote_user [$time_local] '
'"$request" $status $bytes_sent '
'"$http_referer" "$http_user_agent" '
'"$gzip_ratio"';
log_format download '$remote_addr - $remote_user [$time_local] '
'"$request" $status $bytes_sent '
'"$http_referer" "$http_user_agent" '
'"$http_range" "$sent_http_content_range"';
client_header_timeout 3m;
client_body_timeout 3m;
send_timeout 3m;
client_header_buffer_size 1k;
large_client_header_buffers 4 4k;
gzip on;
gzip_min_length 1100;
gzip_buffers 4 8k;
gzip_types text/plain;
output_buffers 1 32k;
postpone_output 1460;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
#send_lowat 12000;
keepalive_timeout 75 20;
#lingering_time 30;
#lingering_timeout 10;
#reset_timedout_connection on;
upstream tomcats {
server 192.168.214.130:8080 weight=1;
server 192.168.214.130:8080 weight=1；
# ip_hash;
}
server {
listen 9999; #nginx监听的端口
server_name localhost; #nginx安装的虚拟机地址
access_log /usr/local/nginx/logs/access.log main;
location / {
proxy_pass http://tomcats; #与上边upstream “tomcats”一致
proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
#proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
client_max_body_size 10m;
client_body_buffer_size 128k;
client_body_temp_path /usr/local/nginx/client_body_temp;
proxy_connect_timeout 90;
proxy_send_timeout 90;
proxy_read_timeout 90;
# proxy_send_lowat 12000;
proxy_buffer_size 4k;
proxy_buffers 4 32k;
proxy_busy_buffers_size 64k;
proxy_temp_file_write_size 64k;
# proxy_temp_path /usr/local/nginx/proxy_temp;
charset gb2312;
}
#error_page 404 /404.html;
#location /404.html {
#root /spool/www;
#charset on;
#source_charset koi8-r;
#}
location /old_stuff/ {
rewrite ^/old_stuff/(.*)$ /new_stuff/$1 permanent;
}
location /download/ {
valid_referers none blocked server_names *.example.com;
if ($invalid_referer) {
#rewrite ^/ http://www.example.com/;
return 403;
}
#rewrite_log on;
# rewrite /download/*/mp3/*.any_ext to /download/*/mp3/*.mp3
rewrite ^/(download/.*)/mp3/(.*)\..*$
/$1/mp3/$2.mp3 break;
root /usr/local;
#autoindex on;
#access_log /var/log/nginx-download.access_log download;
}
location ~* ^.+\.(jpg|jpeg|gif)$ {
root /usr/local;
access_log off;
expires 30d;
}
}
}
redisdemo工程配置及代码
web.xml配置：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<servlet>
<servlet-name>RedisDemo</servlet-name>
<servlet-class>com.tarena.redis.RedisServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>RedisDemo</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>
测试程序：
package com.tarena.redis;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import redis.clients.jedis.Jedis;
public class RedisServlet extends HttpServlet {
@Override
protected void service(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
res.setContentType("text/html;charset=utf-8");
PrintWriter out = res.getWriter();
String uri = req.getRequestURI();
String action = uri.substring(uri.lastIndexOf("/"),
uri.lastIndexOf("."));
Jedis redis = new Jedis("192.168.214.130", 6379);
String serverName = req.getServerName();
if ("/login".equals(action)) {
HttpSession session = req.getSession();
String sessionId = session.getId();
Cookie c = new Cookie("cookieName", sessionId);
redis.set(sessionId, req.getParameter("userName"));
res.addCookie(c);
out.println("nginx:" + serverName + " | "
+ "tomcat:192.168.214.130 添加redis key"
+ req.getParameter("userName"));
} else if ("/main".equals(action)) {
Cookie[] cookies = req.getCookies();
if (cookies != null) {
for (Cookie c : cookies) {
if (c.getName().equals("cookieName")) {
String sessionId = c.getValue();
if (req.getParameter("userName").equals(
redis.get(sessionId))) {
out.println("nginx:" + serverName + " | "
+ "tomcat:192.168.214.130 取得redis key"
+ redis.get(sessionId));
} else {
out.println("nginx:" + serverName + " | "
+ "no key");
}
}
}
} else {
req.getRequestDispatcher("login.jsp").forward(req, res);
}
}
out.close();
}
}
RESTClient测试
http://192.168.214.130:9999/redisdemo/login.do?userName=abcd进入
输入value 点击登陆，将value存入了redis 页面显示：
nginx:192.168.214.130 | tomcat:192.168.214.130 添加redis keyabcd
http://192.168.214.130:9999/redisdemo/main.do?userName=abcd进入，实现负载均衡，页面分别显示
nginx:192.168.214.130 | tomcat:192.168.214.130 取得redis keyabcd
nginx:192.168.214.130 | tomcat:192.168.214.132 取得redis keyabcd