java 通过userAgent获取访问者的操作系统与浏览器

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        StringBuilder userAgent = new StringBuilder("[");
        userAgent.append(request.getHeader("User-Agent"));
        userAgent.append("]");
        int indexOfMac = userAgent.indexOf("Mac OS X");
        int indexOfWindows = userAgent.indexOf("Windows NT");
        int indexOfIE = userAgent.indexOf("MSIE");
        int indexOfIE11 = userAgent.indexOf("rv:");
        int indexOfFF = userAgent.indexOf("Firefox");
        int indexOfSogou = userAgent.indexOf("MetaSr");
        int indexOfChrome = userAgent.indexOf("Chrome");
        int indexOfSafari = userAgent.indexOf("Safari");
        boolean isMac = indexOfMac > 0;
        boolean isWindows = indexOfWindows > 0;
        boolean isLinux = userAgent.indexOf("Linux") > 0;
        boolean containIE = indexOfIE > 0 || (isWindows && (indexOfIE11 > 0));
        boolean containFF = indexOfFF > 0;
        boolean containSogou = indexOfSogou > 0;
        boolean containChrome = indexOfChrome > 0;
        boolean containSafari = indexOfSafari > 0;
        String browser = "";
        if (containSogou) {
            if (containIE) {
                browser = "搜狗" + userAgent.substring(indexOfIE, indexOfIE + "MSIE x.x".length());
            } else if (containChrome) {
                browser = "搜狗" + userAgent.substring(indexOfChrome, indexOfChrome + "Chrome/xx".length());
            }
        } else if (containChrome) {
            browser = userAgent.substring(indexOfChrome, indexOfChrome + "Chrome/xx".length());
        } else if (containSafari) {
            int indexOfSafariVersion = userAgent.indexOf("Version");
            browser = "Safari "
                    + userAgent.substring(indexOfSafariVersion, indexOfSafariVersion + "Version/x.x.x".length());
        } else if (containFF) {
            browser = userAgent.substring(indexOfFF, indexOfFF + "Firefox/xx".length());
        } else if (containIE) {
            if (indexOfIE11 > 0) {
                browser = "MSIE 11";
            } else {
                browser = userAgent.substring(indexOfIE, indexOfIE + "MSIE x.x".length());
            }
        }
        String os = "";
        if (isMac) {
            os = userAgent.substring(indexOfMac, indexOfMac + "MacOS X xxxx".length());
        } else if (isLinux) {
            os = "Linux";
        } else if (isWindows) {
            os = "Windows ";
            String version = userAgent.substring(indexOfWindows + "Windows NT".length(), indexOfWindows
                    + "Windows NTx.x".length());
            if ("5.0".equals(version.trim())) {
                os += "2000";
            } else if ("5.1".equals(version.trim())) {
                os += "XP";
            } else if ("5.2".equals(version.trim())) {
                os += "2003";
            } else if ("6.0".equals(version.trim())) {
                os += "Vista";
            } else if ("6.1".equals(version.trim())) {
                os += "7";
            } else if ("6.2".equals(version.trim())) {
                os += "8";
            } else if ("6.3".equals(version.trim())) {
                os += "8.1";
            }
        }
        System.out.println("系统：" + os + ",浏览器：" + browser);

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