Java项目常见工具类详解

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token

Jwts.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<Claims> 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 accessKeyId id

* @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 appid

wx.open.app_id=wxed995adadav4c01bb89b47

# 微信开放平台 appsecret

wx.open.app_secret=a748251723ad5173ddbsfa4083788de60b90e

# 微信开放平台 重定向url

wx.open.redirect_url=http://localhost:8160/api/ucenter/wx/callback

配置类:

@Component

public 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 appid

public static String WX_OPEN_APP_ID;

//微信开放平台 appsecret

public static String WX_OPEN_APP_SECRET;

//微信开放平台 重定向url

public 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

@Override

public 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:

  1. 发送一个 Post 请求
  2. 提交form表单
  3. 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<String, String> params) throws ConnectTimeoutException,

SocketTimeoutException, Exception {

return postForm(url, params, null, connTimeout, readTimeout);

}

public static String postParameters(String url, Map<String, String> 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<String, String> params, Map<String, String> headers, Integer connTimeout,Integer readTimeout) throws ConnectTimeoutException,

SocketTimeoutException, Exception {

HttpClient client = null;

HttpPost post = new HttpPost(url);

try {

if (params != null && !params.isEmpty()) {

List<NameValuePair> formParams = new ArrayList<NameValuePair>();

Set<Entry<String, String>> entrySet = params.entrySet();

for (Entry<String, String> 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<String, String> 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=GBK

if (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() {

@Override

public boolean verify(String arg0, SSLSession arg1) {

return true;

}

@Override

public void verify(String host, SSLSocket ssl)

throws IOException {

}

@Override

public void verify(String host, X509Certificate cert)

throws SSLException {

}

@Override

public 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<String,String> map = new HashMap<String,String>();

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 block

e.printStackTrace();

} catch (SocketTimeoutException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (Exception e) {

// TODO Auto-generated catch block

e.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

*

*/

@Slf4j

public 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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