root         /usr/myweb;

1.#rewrite ^/$  /ljf/ last; 反向二级目录

2.#反向tomcat网站 
 rewrite / http://192.168.178.128:8080/login.jsp last;

3. jsp转向tomcat网站

location / {

    proxy_pass        http://192.168.124.13;

    proxy_set_header  X-Real-IP  $remote_addr;

}