使用http代理，解决Java对外请求需固定ip问题

背景：对接第三方接口，第三方为安全考虑，需要固定ip设置白名单。公司对外使用动态ip。

办法：

1. 购买一台ip固定的服务器，比如云虚拟服务器。搭建http代理服务器，比如prioxy。

2.安装Privoxy代理软件

yum install -y epel-release privoxy

编辑 /etc/privoxy/config 文件

修改绑定地址，搜索 listen-address ，修改需要绑定的IP

listen-address  0.0.0.0:8118

设置enable-remote-toggle 为 1

enable-remote-toggle 1

重启服务

service privoxy restart

查看服务状态

[root@localhost ~]# service privoxy status
Redirecting to /bin/systemctl status privoxy.service
● privoxy.service - Privoxy Web Proxy With Advanced Filtering Capabilities
   Loaded: loaded (/usr/lib/systemd/system/privoxy.service; disabled; vendor preset: disabled)
   Active: active (running) since Wed 2020-03-04 17:38:26 CST; 5s ago
  Process: 23138 ExecStart=/usr/sbin/privoxy --pidfile /run/privoxy.pid --user privoxy /etc/privoxy/config (code=exited, status=0/SUCCESS)
 Main PID: 23139 (privoxy)
   Memory: 872.0K
   CGroup: /system.slice/privoxy.service
           └─23139 /usr/sbin/privoxy --pidfile /run/privoxy.pid --user privox...

Mar 04 17:38:25 localhost.localdomain systemd[1]: Starting Privoxy Web Proxy ...
Mar 04 17:38:26 localhost.localdomain systemd[1]: Started Privoxy Web Proxy W...
Hint: Some lines were ellipsized, use -l to show in full.
[root@localhost ~]# netstat -anop | grep 8118
tcp        0      0 0.0.0.0:8118            0.0.0.0:*               LISTEN      23139/privoxy        off (0.00/0/0)
tcp        0      0 172.16.1.120:8311       172.16.1.123:28118      ESTABLISHED 15519/nginx: worker  off (0.00/0/0)

ps：

https://www.cnblogs.com/hongdada/p/10787924.html

https://blog.csdn.net/Drug_/article/details/88067231

https://www.jianshu.com/p/05ac5d0911cc

3.HttpClient 设置代理

HttpPost httpPost = new HttpPost(url);
//设置代理IP，设置连接超时时间 、 设置 请求读取数据的超时时间 、 设置从connect Manager获取Connection超时时间、
HttpHost proxy = new HttpHost("172.16.1.120",8118);
RequestConfig requestConfig = RequestConfig.custom()
    .setProxy(proxy)
    .setConnectTimeout(10000)
    .setSocketTimeout(10000)
    .setConnectionRequestTimeout(3000)
    .build();
httpPost.setConfig(requestConfig);