CookieUtil、EncryptUtil(各种加密算法)、HttpUtil

1、CookieUtil

ublic class CookieUtil {

    // 默认缓存时间,单位/秒, 2H
    private static final int COOKIE_MAX_AGE = 60 * 60 * 2;
    // 保存路径,根路径
    private static final String COOKIE_PATH = "/";

    /**
     * 保存
     *
     * @param response
     * @param key
     * @param value
     * @param ifRemember
     */
    public static void set(HttpServletResponse response, String key, String value, boolean ifRemember) {
        int age = ifRemember?COOKIE_MAX_AGE:-1;
        set(response, key, value, null, COOKIE_PATH, age, true);
    }

    /**
     * 保存
     *
     * @param response
     * @param key
     * @param value
     * @param maxAge
     */
    private static void set(HttpServletResponse response, String key, String value, String domain, String path, int maxAge, boolean isHttpOnly) {
        Cookie cookie = new Cookie(key, value);
        if (domain != null) {
            cookie.setDomain(domain);
        }
        cookie.setPath(path);
        cookie.setMaxAge(maxAge);
        cookie.setHttpOnly(isHttpOnly);
        response.addCookie(cookie);
    }

    /**
     * 查询value
     *
     * @param request
     * @param key
     * @return
     */
    public static String getValue(HttpServletRequest request, String key) {
        Cookie cookie = get(request, key);
        if (cookie != null) {
            return cookie.getValue();
        }
        return null;
    }

    /**
     * 查询Cookie
     *
     * @param request
     * @param key
     */
    private static Cookie get(HttpServletRequest request, String key) {
        Cookie[] arr_cookie = request.getCookies();
        if (arr_cookie != null && arr_cookie.length > 0) {
            for (Cookie cookie : arr_cookie) {
                if (cookie.getName().equals(key)) {
                    return cookie;
                }
            }
        }
        return null;
    }

    /**
     * 删除Cookie
     *
     * @param request
     * @param response
     * @param key
     */
    public static void remove(HttpServletRequest request, HttpServletResponse response, String key) {
        Cookie cookie = get(request, key);
        if (cookie != null) {
            set(response, key, "", null, COOKIE_PATH, 0, true);
        }
    }

}

2、EncryptUtil(各种加密算法)

public class EncryptUtil {
    private static final String MD5 = "MD5";
    private static final String SHA1 = "SHA1";
    private static final String HmacMD5 = "HmacMD5";
    private static final String HmacSHA1 = "HmacSHA1";
    private static final String DES = "DES";
    private static final String AES = "AES";

    /**
     * 编码格式；默认使用uft-8
     */
    public String charset = "utf-8";
    /**
     * DES
     */
    public int keysizeDES = 0;
    /**
     * AES
     */
    public int keysizeAES = 128;

    public static volatile EncryptUtil me;

    private EncryptUtil() {
        //单例
    }

    //双重锁
    public static EncryptUtil getInstance() {
        if (me == null) {
            synchronized (EncryptUtil.class) {
                if (me == null) {
                    me = new EncryptUtil();
                }
            }
        }
        return me;
    }

    /**
     * 使用MessageDigest进行单向加密（无密码）
     *
     * @param res       被加密的文本
     * @param algorithm 加密算法名称
     * @return
     */
    private String messageDigest(String res, String algorithm) {
        try {
            MessageDigest md = MessageDigest.getInstance(algorithm);
            byte[] resBytes = charset == null ? res.getBytes() : res.getBytes(charset);
            return base64(md.digest(resBytes));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 使用KeyGenerator进行单向/双向加密（可设密码）
     *
     * @param res       被加密的原文
     * @param algorithm 加密使用的算法名称
     * @param key       加密使用的秘钥
     * @return
     */
    private String keyGeneratorMac(String res, String algorithm, String key) {
        try {
            SecretKey sk = null;
            if (key == null) {
                KeyGenerator kg = KeyGenerator.getInstance(algorithm);
                sk = kg.generateKey();
            } else {
                byte[] keyBytes = charset == null ? key.getBytes() : key.getBytes(charset);
                sk = new SecretKeySpec(keyBytes, algorithm);
            }
            Mac mac = Mac.getInstance(algorithm);
            mac.init(sk);
            byte[] result = mac.doFinal(res.getBytes());
            return base64(result);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 使用KeyGenerator双向加密，DES/AES，注意这里转化为字符串的时候是将2进制转为16进制格式的字符串，不是直接转，因为会出错
     *
     * @param res       加密的原文
     * @param algorithm 加密使用的算法名称
     * @param key       加密的秘钥
     * @param keysize
     * @param isEncode
     * @return
     */
    private String keyGeneratorES(String res, String algorithm, String key, int keysize, boolean isEncode) {
        try {
            KeyGenerator kg = KeyGenerator.getInstance(algorithm);
            if (keysize == 0) {
                byte[] keyBytes = charset == null ? key.getBytes() : key.getBytes(charset);
                kg.init(new SecureRandom(keyBytes));
            } else if (key == null) {
                kg.init(keysize);
            } else {
                byte[] keyBytes = charset == null ? key.getBytes() : key.getBytes(charset);
                kg.init(keysize, new SecureRandom(keyBytes));
            }
            SecretKey sk = kg.generateKey();
            SecretKeySpec sks = new SecretKeySpec(sk.getEncoded(), algorithm);
            Cipher cipher = Cipher.getInstance(algorithm);
            if (isEncode) {
                cipher.init(Cipher.ENCRYPT_MODE, sks);
                byte[] resBytes = charset == null ? res.getBytes() : res.getBytes(charset);
                return parseByte2HexStr(cipher.doFinal(resBytes));
            } else {
                cipher.init(Cipher.DECRYPT_MODE, sks);
                return new String(cipher.doFinal(parseHexStr2Byte(res)));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    private String base64(byte[] res) {
        return Base64.encode(res);
    }

    /**
     * 将二进制转换成16进制
     */
    public static String parseByte2HexStr(byte buf[]) {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < buf.length; i++) {
            String hex = Integer.toHexString(buf[i] & 0xFF);
            if (hex.length() == 1) {
                hex = '0' + hex;
            }
            sb.append(hex.toUpperCase());
        }
        return sb.toString();
    }

    /**
     * 将16进制转换为二进制
     */
    public static byte[] parseHexStr2Byte(String hexStr) {
        if (hexStr.length() < 1)
            return null;
        byte[] result = new byte[hexStr.length() / 2];
        for (int i = 0; i < hexStr.length() / 2; i++) {
            int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
            int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
            result[i] = (byte) (high * 16 + low);
        }
        return result;
    }

    /**
     * md5加密算法进行加密（不可逆）
     *
     * @param res 需要加密的原文
     * @return
     */
    public String MD5(String res) {
        return messageDigest(res, MD5);
    }

    /**
     * md5加密算法进行加密（不可逆）
     *
     * @param res 需要加密的原文
     * @param key 秘钥
     * @return
     */
    public String MD5(String res, String key) {
        return keyGeneratorMac(res, HmacMD5, key);
    }

    /**
     * 使用SHA1加密算法进行加密（不可逆）
     *
     * @param res 需要加密的原文
     * @return
     */
    public String SHA1(String res) {
        return messageDigest(res, SHA1);
    }

    /**
     * 使用SHA1加密算法进行加密（不可逆）
     *
     * @param res 需要加密的原文
     * @param key 秘钥
     * @return
     */
    public String SHA1(String res, String key) {
        return keyGeneratorMac(res, HmacSHA1, key);
    }

    /**
     * 使用DES加密算法进行加密（可逆）
     *
     * @param res 需要加密的原文
     * @param key 秘钥
     * @return
     */
    public String DESencode(String res, String key) {
        return keyGeneratorES(res, DES, key, keysizeDES, true);
    }

    /**
     * 对使用DES加密算法的密文进行解密（可逆）
     *
     * @param res 需要解密的密文
     * @param key 秘钥
     * @return
     */
    public String DESdecode(String res, String key) {
        return keyGeneratorES(res, DES, key, keysizeDES, false);
    }

    /**
     * 使用AES加密算法经行加密（可逆）
     *
     * @param res 需要加密的密文
     * @param key 秘钥
     * @return
     */
    public String AESencode(String res, String key) {
        return keyGeneratorES(res, AES, key, keysizeAES, true);
    }

    /**
     * 对使用AES加密算法的密文进行解密
     *
     * @param res 需要解密的密文
     * @param key 秘钥
     * @return
     */
    public String AESdecode(String res, String key) {
        return keyGeneratorES(res, AES, key, keysizeAES, false);
    }

    /**
     * 使用异或进行加密
     *
     * @param res 需要加密的密文
     * @param key 秘钥
     * @return
     */
    public String XORencode(String res, String key) {
        byte[] bs = res.getBytes();
        for (int i = 0; i < bs.length; i++) {
            bs[i] = (byte) ((bs[i]) ^ key.hashCode());
        }
        return parseByte2HexStr(bs);
    }

    /**
     * 使用异或进行解密
     *
     * @param res 需要解密的密文
     * @param key 秘钥
     * @return
     */
    public String XORdecode(String res, String key) {
        byte[] bs = parseHexStr2Byte(res);
        for (int i = 0; i < bs.length; i++) {
            bs[i] = (byte) ((bs[i]) ^ key.hashCode());
        }
        return new String(bs);
    }

    /**
     * 直接使用异或（第一调用加密，第二次调用解密）
     *
     * @param res 密文
     * @param key 秘钥
     * @return
     */
    public int XOR(int res, String key) {
        return res ^ key.hashCode();
    }

    /**
     * 使用Base64进行加密
     *
     * @param res 密文
     * @return
     */
    public String Base64Encode(String res) {
        return Base64.encode(res.getBytes());
    }

    /**
     * 使用Base64进行解密
     *
     * @param res
     * @return
     */
    public String Base64Decode(String res) {
        return new String(Base64.decode(res));
    }

    public static void main(String[] args) {
        String s = EncryptUtil.getInstance().MD5("admin", "feng");
        System.out.println(s);
    }
}

3、HttpUtil 

public class HttpUtil {


    /**
     * 发送get 网络请求
     *
     * @param uri
     * @return
     */
    public static String get(String uri) {

        CloseableHttpClient httpClient = null;
        HttpGet get = new HttpGet(uri);
        CloseableHttpResponse response = null;
        try {
            httpClient = HttpClients.createDefault();
            response = httpClient.execute(get);
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode == 200) {
                HttpEntity entity = response.getEntity();
                String result = EntityUtils.toString(entity, "UTF-8");
                return result;
            } else {
                return null;
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                response.close();
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }

    /**
     * get
     *
     * @param host
     * @param path
     * @param method
     * @param headers
     * @param querys
     * @return
     * @throws Exception
     */
    public static HttpResponse doGet(String host, String path, String method,
                                     Map<String, String> headers,
                                     Map<String, String> querys)
            throws Exception {
        HttpClient httpClient = wrapClient(host);

        HttpGet request = new HttpGet(buildUrl(host, path, querys));
        for (Map.Entry<String, String> e : headers.entrySet()) {
            request.addHeader(e.getKey(), e.getValue());
        }

        return httpClient.execute(request);
    }

    /**
     * post form
     *
     * @param host
     * @param path
     * @param method
     * @param headers
     * @param querys
     * @param bodys
     * @return
     * @throws Exception
     */
    public static HttpResponse doPost(String host, String path, String method,
                                      Map<String, String> headers,
                                      Map<String, String> querys,
                                      Map<String, String> bodys)
            throws Exception {
        HttpClient httpClient = wrapClient(host);

        HttpPost request = new HttpPost(buildUrl(host, path, querys));
        for (Map.Entry<String, String> e : headers.entrySet()) {
            request.addHeader(e.getKey(), e.getValue());
        }

        if (bodys != null) {
            List<NameValuePair> nameValuePairList = new ArrayList<NameValuePair>();

            for (String key : bodys.keySet()) {
                nameValuePairList.add(new BasicNameValuePair(key, bodys.get(key)));
            }
            UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(nameValuePairList, "utf-8");
            formEntity.setContentType("application/x-www-form-urlencoded; charset=UTF-8");
            request.setEntity(formEntity);
        }

        return httpClient.execute(request);
    }

    /**
     * Post String
     *
     * @param host
     * @param path
     * @param method
     * @param headers
     * @param querys
     * @param body
     * @return
     * @throws Exception
     */
    public static HttpResponse doPost(String host, String path, String method,
                                      Map<String, String> headers,
                                      Map<String, String> querys,
                                      String body)
            throws Exception {
        HttpClient httpClient = wrapClient(host);

        HttpPost request = new HttpPost(buildUrl(host, path, querys));
        for (Map.Entry<String, String> e : headers.entrySet()) {
            request.addHeader(e.getKey(), e.getValue());
        }

        if (StringUtils.isNotBlank(body)) {
            request.setEntity(new StringEntity(body, "utf-8"));
        }

        return httpClient.execute(request);
    }

    /**
     * Post stream
     *
     * @param host
     * @param path
     * @param method
     * @param headers
     * @param querys
     * @param body
     * @return
     * @throws Exception
     */
    public static HttpResponse doPost(String host, String path, String method,
                                      Map<String, String> headers,
                                      Map<String, String> querys,
                                      byte[] body)
            throws Exception {
        HttpClient httpClient = wrapClient(host);

        HttpPost request = new HttpPost(buildUrl(host, path, querys));
        for (Map.Entry<String, String> e : headers.entrySet()) {
            request.addHeader(e.getKey(), e.getValue());
        }

        if (body != null) {
            request.setEntity(new ByteArrayEntity(body));
        }

        return httpClient.execute(request);
    }

    /**
     * Put String
     *
     * @param host
     * @param path
     * @param method
     * @param headers
     * @param querys
     * @param body
     * @return
     * @throws Exception
     */
    public static HttpResponse doPut(String host, String path, String method,
                                     Map<String, String> headers,
                                     Map<String, String> querys,
                                     String body)
            throws Exception {
        HttpClient httpClient = wrapClient(host);

        HttpPut request = new HttpPut(buildUrl(host, path, querys));
        for (Map.Entry<String, String> e : headers.entrySet()) {
            request.addHeader(e.getKey(), e.getValue());
        }

        if (StringUtils.isNotBlank(body)) {
            request.setEntity(new StringEntity(body, "utf-8"));
        }

        return httpClient.execute(request);
    }

    /**
     * Put stream
     *
     * @param host
     * @param path
     * @param method
     * @param headers
     * @param querys
     * @param body
     * @return
     * @throws Exception
     */
    public static HttpResponse doPut(String host, String path, String method,
                                     Map<String, String> headers,
                                     Map<String, String> querys,
                                     byte[] body)
            throws Exception {
        HttpClient httpClient = wrapClient(host);

        HttpPut request = new HttpPut(buildUrl(host, path, querys));
        for (Map.Entry<String, String> e : headers.entrySet()) {
            request.addHeader(e.getKey(), e.getValue());
        }

        if (body != null) {
            request.setEntity(new ByteArrayEntity(body));
        }

        return httpClient.execute(request);
    }

    /**
     * Delete
     *
     * @param host
     * @param path
     * @param method
     * @param headers
     * @param querys
     * @return
     * @throws Exception
     */
    public static HttpResponse doDelete(String host, String path, String method,
                                        Map<String, String> headers,
                                        Map<String, String> querys)
            throws Exception {
        HttpClient httpClient = wrapClient(host);

        HttpDelete request = new HttpDelete(buildUrl(host, path, querys));
        for (Map.Entry<String, String> e : headers.entrySet()) {
            request.addHeader(e.getKey(), e.getValue());
        }

        return httpClient.execute(request);
    }

    private static String buildUrl(String host, String path, Map<String, String> querys) throws UnsupportedEncodingException {
        StringBuilder sbUrl = new StringBuilder();
        sbUrl.append(host);
        if (!StringUtils.isBlank(path)) {
            sbUrl.append(path);
        }
        if (null != querys) {
            StringBuilder sbQuery = new StringBuilder();
            for (Map.Entry<String, String> query : querys.entrySet()) {
                if (0 < sbQuery.length()) {
                    sbQuery.append("&");
                }
                if (StringUtils.isBlank(query.getKey()) && !StringUtils.isBlank(query.getValue())) {
                    sbQuery.append(query.getValue());
                }
                if (!StringUtils.isBlank(query.getKey())) {
                    sbQuery.append(query.getKey());
                    if (!StringUtils.isBlank(query.getValue())) {
                        sbQuery.append("=");
                        sbQuery.append(URLEncoder.encode(query.getValue(), "utf-8"));
                    }
                }
            }
            if (0 < sbQuery.length()) {
                sbUrl.append("?").append(sbQuery);
            }
        }

        return sbUrl.toString();
    }

    private static HttpClient wrapClient(String host) {
        HttpClient httpClient = new DefaultHttpClient();
        if (host.startsWith("https://")) {
            sslClient(httpClient);
        }

        return httpClient;
    }

    private static void sslClient(HttpClient httpClient) {
        try {
            SSLContext ctx = SSLContext.getInstance("TLS");
            X509TrustManager tm = new X509TrustManager() {
                public X509Certificate[] getAcceptedIssuers() {
                    return null;
                }

                public void checkClientTrusted(X509Certificate[] xcs, String str) {

                }

                public void checkServerTrusted(X509Certificate[] xcs, String str) {

                }
            };
            ctx.init(null, new TrustManager[]{tm}, null);
            SSLSocketFactory ssf = new SSLSocketFactory(ctx);
            ssf.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
            ClientConnectionManager ccm = httpClient.getConnectionManager();
            SchemeRegistry registry = ccm.getSchemeRegistry();
            registry.register(new Scheme("https", 443, ssf));
        } catch (KeyManagementException ex) {
            throw new RuntimeException(ex);
        } catch (NoSuchAlgorithmException ex) {
            throw new RuntimeException(ex);
        }
    }