idea向System.getenv()添加系统环境变量的操作

public static String debugHttpRequest(HttpRequest request) {
        if (isHttpDebug) {
            StringBuilder debugString = new StringBuilder();

            String sysUrl = request.getSysUrl();
            URL url = null;
            try {
                url = new URL(sysUrl);
                debugString.append("> " + request.getSysMethod() + " " + url.getProtocol().toUpperCase() + "/1.1\n> ");
                debugString.append("Host : " + url.getHost() + "\n> ");
            } catch (MalformedURLException e) {
                debugString.append("> " + request.getSysMethod() + " " + sysUrl + "\n> ");
                debugString.append("Host : " + sysUrl + "\n> ");
            }
            Map<String, String> requestHeaders = request.getSysHeaders();
            for (Entry<String, String> entry : requestHeaders.entrySet()) {
                debugString.append(entry.getKey() + " : " + entry.getValue() + "\n> ");
            }
            debugString.append("Request URL : " + sysUrl + "\n> ");
            if (isHttpContentDebug) {
                try {
                    debugString.append("\n" + request.getHttpContentString());
                } catch (ClientException e) {
                    debugString.append("\n" + "Can not parse response due to unsupported encoding : " + request
                            .getSysEncoding());
                }
            }
            log.info("\n" + debugString);
            return debugString.toString();
        } else {
            return null;
        }
    }

static {
        Boolean flag = "sdk".equalsIgnoreCase(System.getenv("DEBUG"));
        isHttpDebug = flag;
        isHttpContentDebug = flag;
    }

for (String s : System.getenv().keySet()) {
    System.out.println(s+":"+System.getenv(s));
}

System.out.println(System.getenv("LOCAL_PROXY"));