曾彪彪的个人博客 -- ResTemplate代理设置

在使用RestTemplate时，如果需要设置代理，可以参考如下代码：

```
@Bean
    public RestTemplate restTemplate() {
        RestTemplate restTemplate;
        ProxyConfig proxyConfig = proxyConfig();
        if (proxyConfig.isEnableProxy()) {
            final String username = proxyConfig.getUsername();
            final String password = proxyConfig.getPassword();
            final String proxyUrl = proxyConfig.getProxyUrl();
            final int port = Integer.parseInt(proxyConfig.getProxyPort());

CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
            credentialsProvider.setCredentials(
                    new AuthScope(proxyUrl, port),
                    new UsernamePasswordCredentials(username, password));

HttpHost myProxy = new HttpHost(proxyUrl, port);
            HttpClientBuilder clientBuilder = HttpClientBuilder.create();
            clientBuilder.setProxy(myProxy).setDefaultCredentialsProvider(credentialsProvider).disableCookieManagement();

HttpClient httpClient = clientBuilder.build();
            HttpComponentsClientHttpRequestFactory factory = new HttpComponentsClientHttpRequestFactory();

factory.setHttpClient(httpClient);
            restTemplate = new RestTemplate(factory);
        } else {
            restTemplate = new RestTemplate();
        }

RestTemplateUtil.setRestTemplateTimeout(restTemplate, 30000, 30000);

restTemplate.getMessageConverters().add(0, new StringHttpMessageConverter(Charset.forName("UTF-8")));
        return restTemplate;
    }
```

在读取代理配置时，可以把配置写在配置文件中，但是这样不是很方便，比如无法灵活修改，也容易在配置文件中暴露代理信息。推荐的方法是通过jvm参数设置代理信息。读取代理信息代码如下：

```
@Bean
    public ProxyConfig proxyConfig() {
        ProxyConfig proxyConfig = new ProxyConfig();
        Properties properties = System.getProperties();
        String proxySet = properties.getProperty("proxySet");
        if (proxySet != null && proxySet.toLowerCase().equals("true")) {
            proxyConfig.setEnableProxy(true);
            proxyConfig.setProxyUrl(properties.getProperty("http.proxyHost"));
            proxyConfig.setProxyPort(properties.getProperty("http.proxyPort"));
            proxyConfig.setUsername(properties.getProperty("http.proxyUser"));
            proxyConfig.setPassword(properties.getProperty("http.proxyPassword"));
        }

return proxyConfig;
    }
```

在启动应用时，添加如下参数即可。记得要添加proxySet=true参数。

```
java -jar -DproxySet=true -Dhttp.proxyHost=proxyServer -Dhttp.proxyPort=8888 -Dhttp.proxyUser=username -Dhttp.proxyPassword=password -Dspring.profiles.active=test -Dsun.net.client.defaultConnectTimeout=30000 -Dsun.net.client.defaultReadTimeout=30000 application-0.0.1-SNAPSHOT.jar >/dev/null 2>&1 &
```

ResTemplate代理设置

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