Java项目常见工具类详解
作者：LL.LEBRON
这篇文章主要为大家总结了平时在Java项目中使用的工具类：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客户端工具类和获取IP工具类。需要的可以参考一下
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：
- 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<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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