Java项目常见工具类详解 Java项目常见工具类详解

JWT工具类
MD5工具类
视频点播工具类
公共常量工具类
日期操作工具类
Http客户端工具类
获取IP工具类

JWT工具类这里一共涉及四个方法：
传入用户信息获得token
传入token字符串判断token是否存在与有效
传入HttpServletRequest，通过获取Header中的token判断是否存在与有效
根据token获取用户id

public class JwtUtils {//token过期时间public static final long EXPIRE = 1000 * 60 * 60 * 24; //秘钥public static final String APP_SECRET = "ukc8BDbRigUDaY6pZFfWus2jZWLPHO"; /*** 获得token** @param id用户id* @param nickname 用户昵称* @return*/public static String getJwtToken(String id, String nickname) {String JwtToken = Jwts.builder()//设置jwt头信息.setHeaderParam("typ", "JWT").setHeaderParam("alg", "HS256")//设置分类.setSubject("guli-user")//设置签发时间.setIssuedAt(new Date())//设置过期时间=当前时间+过多久过期的时间.setExpiration(new Date(System.currentTimeMillis() + EXPIRE))//设置token主体部分，存储用户信息.claim("id", id).claim("nickname", nickname)//设置签发算法+秘钥.signWith(SignatureAlgorithm.HS256, APP_SECRET).compact(); return JwtToken; }/*** 判断token是否存在与有效** @param jwtToken* @return*/public static boolean checkToken(String jwtToken) {if (StringUtils.isEmpty(jwtToken)) return false; try {//验证token是否是有效的tokenJwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken); } catch (Exception e) {e.printStackTrace(); return false; }return true; }/*** 判断token是否存在与有效** @param request* @return*/public static boolean checkToken(HttpServletRequest request) {try {String jwtToken = request.getHeader("token"); if (StringUtils.isEmpty(jwtToken)) {return false; }Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken); } catch (Exception e) {e.printStackTrace(); return false; }return true; }/*** 根据token获取会员id** @param request* @return*/public static String getMemberIdByJwtToken(HttpServletRequest request) {String jwtToken = request.getHeader("token"); if (StringUtils.isEmpty(jwtToken)) return ""; Jws claimsJws = Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken); Claims claims = claimsJws.getBody(); return (String) claims.get("id"); }}

MD5工具类

public final class MD5 {/*** 传入字符串，返回经过MD5加密的后的字符串** @param strSrc 需要加密的字符串* @return 返回加密后的字符串*/public static String encrypt(String strSrc) {try {//用来将字节转换成 16 进制表示的字符char hexChars[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8','9', 'a', 'b', 'c', 'd', 'e', 'f'}; byte[] bytes = strSrc.getBytes(); //得到实现指定摘要算法的 MessageDigest对象MessageDigest md = MessageDigest.getInstance("MD5"); //使用指定的 byte数组更新摘要md.update(bytes); //通过执行诸如填充之类的最终操作完成哈希计算。在调用此方法之后，摘要被重置bytes = md.digest(); int j = bytes.length; char[] chars = new char[j * 2]; int k = 0; //从第一个字节开始，对每一个字节,转换成 16 进制字符for (int i = 0; i < bytes.length; i++) {//取第 i 个字节byte b = bytes[i]; //取字节中高 4 位的数字转换chars[k++] = hexChars[b >>> 4 & 0xf]; //取字节中低 4 位的数字转换chars[k++] = hexChars[b & 0xf]; }//将转换的结果转换为字符串返回return new String(chars); } catch (NoSuchAlgorithmException e) {e.printStackTrace(); throw new RuntimeException("MD5加密出错！！+" + e); }}public static void main(String[] args) {System.out.println(MD5.encrypt("111111")); }}

视频点播工具类得到视频点播需要的初始化对象DefaultAcsClient：

public class InitVodCilent {/*** 得到视频点播需要的client** @param accessKeyIdid* @param accessKeySecret 秘钥* @return 返回DefaultAcsClient对象* @throws ClientException*/public static DefaultAcsClient initVodClient(String accessKeyId, String accessKeySecret) throws ClientException {//点播服务接入区域String regionId = "cn-shanghai"; DefaultProfile profile = DefaultProfile.getProfile(regionId, accessKeyId, accessKeySecret); DefaultAcsClient client = new DefaultAcsClient(profile); return client; }}

公共常量工具类对于一些微信支付和阿里云OSS等有许多固定地址的，我们可以使用一个工具类定义为常量，方便获取
这里举个栗子
先在配置文件定义：

# 微信开放平台 appidwx.open.app_id=wxed995adadav4c01bb89b47# 微信开放平台 appsecretwx.open.app_secret=a748251723ad5173ddbsfa4083788de60b90e# 微信开放平台重定向urlwx.open.redirect_url=http://localhost:8160/api/ucenter/wx/callback

配置类：

@Componentpublic class ConstantWxUtils implements InitializingBean {@Value("${wx.open.app_id}")private String appId; @Value("${wx.open.app_secret}")private String appSecret; @Value("${wx.open.redirect_url}")private String redirectUrl; //微信开放平台 appidpublic static String WX_OPEN_APP_ID; //微信开放平台 appsecretpublic static String WX_OPEN_APP_SECRET; //微信开放平台重定向urlpublic static String WX_OPEN_REDIRECT_URL; //保证了这些值已经从配置文件读取了，在进行操作@Overridepublic void afterPropertiesSet() throws Exception {WX_OPEN_APP_ID = appId; WX_OPEN_APP_SECRET = appSecret; WX_OPEN_REDIRECT_URL = redirectUrl; }}

日期操作工具类这里一共涉及二个方法：
格式化Date日期，转换为字符串返回
在日期date上增加amount天，返回Data

public class DateUtil {private static final String dateFormat = "yyyy-MM-dd"; /*** 格式化日期** @param date* @return*/public static String formatDate(Date date) {SimpleDateFormat sdf = new SimpleDateFormat(dateFormat); return sdf.format(date); }/*** 在日期date上增加amount天 ** @param date处理的日期，非null* @param amount 要加的天数，可能为负数*/public static Date addDays(Date date, int amount) {Calendar now = Calendar.getInstance(); now.setTime(date); now.set(Calendar.DATE, now.get(Calendar.DATE) + amount); return now.getTime(); }public static void main(String[] args) {System.out.println(DateUtil.formatDate(new Date())); System.out.println(DateUtil.formatDate(DateUtil.addDays(new Date(), -1))); }}

Http客户端工具类封装一个HttpClientUtils，可以实现：

发送一个 Post 请求
提交form表单
发送一个 GET 请求

public class HttpClientUtils {public static final int connTimeout=10000; public static final int readTimeout=10000; public static final String charset="UTF-8"; private static HttpClient client = null; static {PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager(); cm.setMaxTotal(128); cm.setDefaultMaxPerRoute(128); client = HttpClients.custom().setConnectionManager(cm).build(); }public static String postParameters(String url, String parameterStr) throws ConnectTimeoutException, SocketTimeoutException, Exception{return post(url,parameterStr,"application/x-www-form-urlencoded",charset,connTimeout,readTimeout); }public static String postParameters(String url, String parameterStr,String charset, Integer connTimeout, Integer readTimeout) throws ConnectTimeoutException, SocketTimeoutException, Exception{return post(url,parameterStr,"application/x-www-form-urlencoded",charset,connTimeout,readTimeout); }public static String postParameters(String url, Map params) throws ConnectTimeoutException,SocketTimeoutException, Exception {return postForm(url, params, null, connTimeout, readTimeout); }public static String postParameters(String url, Map params, Integer connTimeout,Integer readTimeout) throws ConnectTimeoutException,SocketTimeoutException, Exception {return postForm(url, params, null, connTimeout, readTimeout); }public static String get(String url) throws Exception {return get(url, charset, null, null); }public static String get(String url, String charset) throws Exception {return get(url, charset, connTimeout, readTimeout); }/*** 发送一个 Post 请求, 使用指定的字符集编码** @param url 请求地址* @param body RequestBody* @param mimeType 例如 application/xml "application/x-www-form-urlencoded" a=1&b=2&c=3* @param charset 编码* @param connTimeout 建立链接超时时间,毫秒.* @param readTimeout 响应超时时间,毫秒.* @return ResponseBody, 使用指定的字符集编码.* @throws ConnectTimeoutException 建立链接超时异常* @throws SocketTimeoutException响应超时* @throws Exception*/public static String post(String url, String body, String mimeType,String charset, Integer connTimeout, Integer readTimeout)throws ConnectTimeoutException, SocketTimeoutException, Exception {HttpClient client = null; //创建Http Post请求HttpPost post = new HttpPost(url); String result = ""; try {if (StringUtils.isNotBlank(body)) {HttpEntity entity = new StringEntity(body, ContentType.create(mimeType, charset)); post.setEntity(entity); }// 设置参数Builder customReqConf = RequestConfig.custom(); if (connTimeout != null) {customReqConf.setConnectTimeout(connTimeout); }if (readTimeout != null) {customReqConf.setSocketTimeout(readTimeout); }post.setConfig(customReqConf.build()); HttpResponse res; if (url.startsWith("https")) {// 执行 Https 请求client = createSSLInsecureClient(); res = client.execute(post); } else {// 执行 Http 请求client = HttpClientUtils.client; res = client.execute(post); }result = IOUtils.toString(res.getEntity().getContent(), charset); } finally {post.releaseConnection(); if (url.startsWith("https") && client != null&& client instanceof CloseableHttpClient) {((CloseableHttpClient) client).close(); }}return result; }/*** 提交form表单** @param url* @param params* @param connTimeout* @param readTimeout* @return* @throws ConnectTimeoutException* @throws SocketTimeoutException* @throws Exception*/public static String postForm(String url, Map params, Map headers, Integer connTimeout,Integer readTimeout) throws ConnectTimeoutException,SocketTimeoutException, Exception {HttpClient client = null; HttpPost post = new HttpPost(url); try {if (params != null && !params.isEmpty()) {List formParams = new ArrayList(); Set entrySet = params.entrySet(); for (Entry entry : entrySet) {formParams.add(new BasicNameValuePair(entry.getKey(), entry.getValue())); }UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formParams, Consts.UTF_8); post.setEntity(entity); }if (headers != null && !headers.isEmpty()) {for (Entry entry : headers.entrySet()) {post.addHeader(entry.getKey(), entry.getValue()); }}// 设置参数Builder customReqConf = RequestConfig.custom(); if (connTimeout != null) {customReqConf.setConnectTimeout(connTimeout); }if (readTimeout != null) {customReqConf.setSocketTimeout(readTimeout); }post.setConfig(customReqConf.build()); HttpResponse res = null; if (url.startsWith("https")) {// 执行 Https 请求.client = createSSLInsecureClient(); res = client.execute(post); } else {// 执行 Http 请求.client = HttpClientUtils.client; res = client.execute(post); }return IOUtils.toString(res.getEntity().getContent(), "UTF-8"); } finally {post.releaseConnection(); if (url.startsWith("https") && client != null&& client instanceof CloseableHttpClient) {((CloseableHttpClient) client).close(); }}}/*** 发送一个 GET 请求** @param url* @param charset* @param connTimeout建立链接超时时间,毫秒* @param readTimeout响应超时时间,毫秒* @return* @throws ConnectTimeoutException建立链接超时* @throws SocketTimeoutException响应超时* @throws Exception*/public static String get(String url, String charset, Integer connTimeout,Integer readTimeout)throws ConnectTimeoutException,SocketTimeoutException, Exception {HttpClient client = null; // 创建http GET请求HttpGet get = new HttpGet(url); String result = ""; try {// 设置参数Builder customReqConf = RequestConfig.custom(); //设置链接超时时间,毫秒if (connTimeout != null) {customReqConf.setConnectTimeout(connTimeout); }//设置响应超时时间,毫秒if (readTimeout != null) {customReqConf.setSocketTimeout(readTimeout); }get.setConfig(customReqConf.build()); HttpResponse res = null; if (url.startsWith("https")) {// 执行 Https 请求client = createSSLInsecureClient(); res = client.execute(get); } else {// 执行 Http 请求client = HttpClientUtils.client; res = client.execute(get); }result = IOUtils.toString(res.getEntity().getContent(), charset); } finally {get.releaseConnection(); if (url.startsWith("https") && client != null && client instanceof CloseableHttpClient) {((CloseableHttpClient) client).close(); }}return result; }/*** 从 response 里获取 charset** @param ressponse* @return*/@SuppressWarnings("unused")private static String getCharsetFromResponse(HttpResponse ressponse) {// Content-Type:text/html; charset=GBKif (ressponse.getEntity() != null&& ressponse.getEntity().getContentType() != null && ressponse.getEntity().getContentType().getValue() != null) {String contentType = ressponse.getEntity().getContentType().getValue(); if (contentType.contains("charset=")) {return contentType.substring(contentType.indexOf("charset=") + 8); }}return null; }/*** 创建 SSL连接* @return* @throws GeneralSecurityException*/private static CloseableHttpClient createSSLInsecureClient() throws GeneralSecurityException {try {SSLContext sslContext = new SSLContextBuilder().loadTrustMaterial(null, new TrustStrategy() {public boolean isTrusted(X509Certificate[] chain,String authType) throws CertificateException {return true; }}).build(); SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext, new X509HostnameVerifier() {@Overridepublic boolean verify(String arg0, SSLSession arg1) {return true; }@Overridepublic void verify(String host, SSLSocket ssl)throws IOException {}@Overridepublic void verify(String host, X509Certificate cert)throws SSLException {}@Overridepublic void verify(String host, String[] cns,String[] subjectAlts) throws SSLException {}}); return HttpClients.custom().setSSLSocketFactory(sslsf).build(); } catch (GeneralSecurityException e) {throw e; }}public static void main(String[] args) {try {String str= post("https://localhost:443/ssl/test.shtml","name=12&page=34","application/x-www-form-urlencoded", "UTF-8", 10000, 10000); //String str= get("https://localhost:443/ssl/test.shtml?name=12&page=34","GBK"); /*Map map = new HashMap(); map.put("name", "111"); map.put("page", "222"); String str= postForm("https://localhost:443/ssl/test.shtml",map,null, 10000, 10000); */System.out.println(str); } catch (ConnectTimeoutException e) {// TODO Auto-generated catch blocke.printStackTrace(); } catch (SocketTimeoutException e) {// TODO Auto-generated catch blocke.printStackTrace(); } catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace(); }}}

获取IP工具类根据request获取请求的Ip地址：

/** * 根据request获取请求的Ip地址 * */@Slf4jpublic class IpUtils {/*** 获取IP地址* 使用Nginx等反向代理软件，则不能通过request.getRemoteAddr()获取IP地址* 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址*/public static String getIpAddr(HttpServletRequest request) {String ip = null, unknown = "unknown", seperator = ","; int maxLength = 15; try {ip = request.getHeader("x-forwarded-for"); if (StringUtils.isEmpty(ip) || unknown.equalsIgnoreCase(ip)) {ip = request.getHeader("Proxy-Client-IP"); }if (StringUtils.isEmpty(ip) || ip.length() == 0 || unknown.equalsIgnoreCase(ip)) {ip = request.getHeader("WL-Proxy-Client-IP"); }if (StringUtils.isEmpty(ip) || unknown.equalsIgnoreCase(ip)) {ip = request.getHeader("HTTP_CLIENT_IP"); }if (StringUtils.isEmpty(ip) || unknown.equalsIgnoreCase(ip)) {ip = request.getHeader("HTTP_X_FORWARDED_FOR"); }if (StringUtils.isEmpty(ip) || unknown.equalsIgnoreCase(ip)) {ip = request.getRemoteAddr(); }} catch (Exception e) {log.error("IpUtils ERROR ", e); }// 使用代理，则获取第一个IP地址if (StringUtils.isEmpty(ip) && ip.length() > maxLength) {int idx = ip.indexOf(seperator); if (idx > 0) {ip = ip.substring(0, idx); }}return ip; }/*** 获取ip地址** @return*/public static String getIpAddr() {HttpServletRequest request = HttpContextUtils.getHttpServletRequest(); return getIpAddr(request); }}

获取请求工具类：

/** * 获取请求工具类 */public class HttpContextUtils {public static HttpServletRequest getHttpServletRequest(){return ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest(); }}

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