動靜分離不解釋了，理論網上一堆一堆的，但實現手段我理解就是特定的請求使用特定的處理方式。

nginx安裝參考這個：

https://blog.csdn.net/tangyaliang11/article/details/78675535

tomcat安裝參考這個：
https://blog.csdn.net/tangyaliang11/article/details/81124349

僅作為演示使用，以圖片為例。
首先將tomcat下root資料夾下.png圖片剪下至nginx下html下。
這時訪問tomcat應該看不到圖片了，如果能看到，那麼請清理瀏覽器快取。

然後配置nginx。

主要配置有三處。
1、http節點增加代理
 upstream drugs{
      server 192.168.2.4:8080; #tomcat地址
    }
2、server處增加tomcat代理與圖片解析目錄
      #代理tomcat
        location / {
            proxy_pass http://drugs;
        }
        #圖片解析目錄
      location ~ .*\.(png|jpg)$ {
            root html;
        break;
        }
3、開啟日誌的註釋。（會看日誌很重要）
 log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  logs/access.log  main;

4、執行成功，如果不成功就看日誌，日誌中如果有這個關鍵詞“Permission denied”，那就是沒許可權讀取圖片，將nginx.conf的#user root;解除註釋，reload在嘗試訪問ok。
以下是nginx全配置，tomcat的jsp頁面不用修改。

user  root;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;

events {
    worker_connections  1024;
}

http {
    include       mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

     upstream drugs{
	  server 192.168.2.4:8080;
	}
    server {
        listen       80;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;
	  
        location / {
            proxy_pass http://drugs;
        }
      location ~ .*\.(png|jpg)$ {
            root /usr/local/nginx/html;
		break;
        }

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ \.php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:9000;
        #    fastcgi_index  index.php;
        #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
        #    include        fastcgi_params;
        #}

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #    deny  all;
        #}
    }


    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}


    # HTTPS server
    #
    #server {
    #    listen       443 ssl;
    #    server_name  localhost;

    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;

    #    ssl_session_cache    shared:SSL:1m;
    #    ssl_session_timeout  5m;

    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers  on;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}

}