目錄
1.Email 發送郵件工具
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;
/**
* 發郵件工具類
*/
public final class MailUtils {
private static final String USER = "[email protected]"; // 發件人稱號，同郵箱地址
private static final String PASSWORD = "xxxxxxxxx"; // 如果是qq郵箱可以使戶端授權碼，或者登錄密碼
/**
* @param to 收件人郵箱
* @param text 郵件正文
* @param title 標題
*/
/* 發送驗證信息的郵件 */
public static boolean sendMail(String to, String text, String title){
try {
final Properties props = new Properties();
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.host", "smtp.qq.com");
// 發件人的賬號
props.put("mail.user", USER);
//發件人的密碼
props.put("mail.password", PASSWORD);
// 構建授權信息，用於進行SMTP進行身份驗證
Authenticator authenticator = new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
// 用戶名、密碼
String userName = props.getProperty("mail.user");
String password = props.getProperty("mail.password");
return new PasswordAuthentication(userName, password);
}
};
// 使用環境屬性和授權信息，創建郵件會話
Session mailSession = Session.getInstance(props, authenticator);
// 創建郵件消息
MimeMessage message = new MimeMessage(mailSession);
// 設置發件人
String username = props.getProperty("mail.user");
InternetAddress form = new InternetAddress(username);
message.setFrom(form);
// 設置收件人
InternetAddress toAddress = new InternetAddress(to);
message.setRecipient(Message.RecipientType.TO, toAddress);
// 設置郵件標題
message.setSubject(title);
// 設置郵件的內容體
message.setContent(text, "text/html;charset=UTF-8");
// 發送郵件
Transport.send(message);
return true;
}catch (Exception e){
System.out.println("出錯了");
}
return false;
}
// public static void main(String[] args) throws Exception { // 做測試用
// MailUtils.sendMail("[email protected]","你好，這是一封測試郵件，無需回覆。","測試郵件");
// System.out.println("發送成功");
// }
}
2.隨機數字 驗證碼工具
/**
* 驗證碼
*/
@WebServlet("/checkCode")
public class CheckCodeServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
//服務器通知瀏覽器不要緩存
response.setHeader("pragma","no-cache");
response.setHeader("cache-control","no-cache");
response.setHeader("expires","0");
//在內存中創建一個長80，寬30的圖片，默認黑色背景
//參數一：長
//參數二：寬
//參數三：顏色
int width = 80;
int height = 30;
BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
//獲取畫筆
Graphics g = image.getGraphics();
//設置畫筆顏色爲灰色
g.setColor(Color.GRAY);
//填充圖片
g.fillRect(0,0, width,height);
//產生4個隨機驗證碼，12Ey
String checkCode = getCheckCode();
//將驗證碼放入HttpSession中
request.getSession().setAttribute("CHECKCODE_SERVER",checkCode);
//設置畫筆顏色爲黃色
g.setColor(Color.YELLOW);
//設置字體的小大
g.setFont(new Font("黑體",Font.BOLD,24));
//向圖片上寫入驗證碼
g.drawString(checkCode,15,25);
//將內存中的圖片輸出到瀏覽器
//參數一：圖片對象
//參數二：圖片的格式，如PNG,JPG,GIF
//參數三：圖片輸出到哪裏去
ImageIO.write(image,"PNG",response.getOutputStream());
}
/**
* 產生4位隨機字符串
*/
private String getCheckCode() {
String base = "0123456789ABCDEFGabcdefg";
int size = base.length();
Random r = new Random();
StringBuffer sb = new StringBuffer();
for(int i=1;i<=4;i++){
//產生0到size-1的隨機值
int index = r.nextInt(size);
//在base字符串中獲取下標爲index的字符
char c = base.charAt(index);
//將c放入到StringBuffer中去
sb.append(c);
}
return sb.toString();
}
3.cookieUtsil 操作cookie的基本工具
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
/**
* @param
* @return
*/
public class CookieUtil {
/***
* 獲得cookie中的值，默認爲主ip：www.book.com
* @param request
* @param cookieName
* @param isDecoder
* @return
*/
public static String getCookieValue(HttpServletRequest request, String cookieName, boolean isDecoder) {
Cookie[] cookies = request.getCookies();
if (cookies == null || cookieName == null){
return null;
}
String retValue = null;
try {
for (int i = 0; i < cookies.length; i++) {
if (cookies[i].getName().equals(cookieName)) {
if (isDecoder) {//如果涉及中文
retValue = URLDecoder.decode(cookies[i].getValue(), "UTF-8");
} else {
retValue = cookies[i].getValue();
}
break;
}
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return retValue;
}
/***
* 設置cookie的值
* @param request
* @param response
* @param cookieName
* @param cookieValue
* @param cookieMaxage
* @param isEncode
*/
public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName, String cookieValue, int cookieMaxage, boolean isEncode) {
try {
if (cookieValue == null) {
cookieValue = "";
} else if (isEncode) {
cookieValue = URLEncoder.encode(cookieValue, "utf-8");
}
Cookie cookie = new Cookie(cookieName, cookieValue);
if (cookieMaxage >= 0)
cookie.setMaxAge(cookieMaxage);
if (null != request)// 設置域名的cookie
cookie.setDomain(getDomainName(request));
// 在域名的根路徑下保存
cookie.setPath("/");
response.addCookie(cookie);
} catch (Exception e) {
e.printStackTrace();
}
}
/***
* 獲得cookie的主域名，本系統爲book.com，保存時使用
* @param request
* @return
*/
private static final String getDomainName(HttpServletRequest request) {
String domainName = null;
String serverName = request.getRequestURL().toString();
if (serverName == null || serverName.equals("")) {
domainName = "";
} else {
serverName = serverName.toLowerCase();
//去掉前面http://
serverName = serverName.substring(7);
//的到第一個/的位置www.cart.com/123/3
final int end = serverName.indexOf("/");
//去掉後面沒用的url路徑 www.cart.com
serverName = serverName.substring(0, end);
//得到[www,cart,com]
final String[] domains = serverName.split("\\.");
int len = domains.length;
if (len > 3) {
// www.xxx.com.cn
domainName = domains[len - 3] + "." + domains[len - 2] + "." + domains[len - 1];
} else if (len <= 3 && len > 1) {
// xxx.com or xxx.cn
//取一級域名 //的到.com 或者.cn
domainName = domains[len - 2] + "." + domains[len - 1];
} else {
domainName = serverName;
}
}
if (domainName != null && domainName.indexOf(":") > 0) {
String[] ary = domainName.split("\\:");
domainName = ary[0];
}
System.out.println("domainName = " + domainName);
return domainName;
}
/***
* 將cookie中的內容按照key刪除
* @param request
* @param response
* @param cookieName
*/
public static void deleteCookie(HttpServletRequest request, HttpServletResponse response, String cookieName) {
setCookie(request, response, cookieName, null, 0, false);
}
}
4.HttpclientUtil 發送Get Post請求
public class HttpclientUtil {
public static String doGet(String url) {
// 創建Httpclient對象
CloseableHttpClient httpclient = HttpClients.createDefault();
// 創建http GET請求
HttpGet httpGet = new HttpGet(url);
CloseableHttpResponse response = null;
try {
// 執行請求
response = httpclient.execute(httpGet);
// 判斷返回狀態是否爲200
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
HttpEntity entity = response.getEntity();
String result = EntityUtils.toString(entity, "UTF-8");
EntityUtils.consume(entity);
httpclient.close();
return result;
}
httpclient.close();
}catch (IOException e){
e.printStackTrace();
return null;
}
return null;
}
public static String doPost(String url, Map<String,String> paramMap) {
// 創建Httpclient對象
CloseableHttpClient httpclient = HttpClients.createDefault();
// 創建http Post請求
HttpPost httpPost = new HttpPost(url);
CloseableHttpResponse response = null;
try {
List<BasicNameValuePair> list=new ArrayList<>();
for (Map.Entry<String, String> entry : paramMap.entrySet()) {
list.add(new BasicNameValuePair(entry.getKey(),entry.getValue())) ;
}
HttpEntity httpEntity=new UrlEncodedFormEntity(list,"utf-8");
httpPost.setEntity(httpEntity);
// 執行請求
response = httpclient.execute(httpPost);
// 判斷返回狀態是否爲200
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
HttpEntity entity = response.getEntity();
String result = EntityUtils.toString(entity, "UTF-8");
EntityUtils.consume(entity);
httpclient.close();
return result;
}
httpclient.close();
}catch (IOException e){
e.printStackTrace();
return null;
}
return null;
}
}
5.MD5Util
public class MD5Util {
/**
* The M d5.
*/
static MessageDigest MD5 = null;
/**
* The Constant HEX_DIGITS.
*/
private static final char HEX_DIGITS[] = {'0', '1', '2', '3', '4', '5',
'6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
static {
try {
MD5 = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException ne) {
ne.printStackTrace();
}
}
/**
* 獲取文件md5值.
* @param file the file
* @return md5串
* @throws IOException
*/
public static String getFileMD5String(File file) throws IOException {
FileInputStream fileInputStream = null;
try {
fileInputStream = new FileInputStream(file);
byte[] buffer = new byte[8192];
int length;
while ((length = fileInputStream.read(buffer)) != -1) {
MD5.update(buffer, 0, length);
}
return new String(encodeHex(MD5.digest()));
} catch (FileNotFoundException e) {
throw e;
} catch (IOException e) {
throw e;
} finally {
try {
if (fileInputStream != null)
fileInputStream.close();
} catch (IOException e) {
throw e;
}
}
}
/**
* 獲取文件md5值.
*
* @param data the byte[] data
* @return md5串
* @throws IOException
*/
public static String getFileMD5String(byte[] data) throws IOException {
MD5.update(data);
return new String(encodeHex(MD5.digest()));
}
/**
* Encode hex.
*
* @param bytes the bytes
* @return the string
*/
public static String encodeHex(byte bytes[]) {
return bytesToHex(bytes, 0, bytes.length);
}
/**
* Bytes to hex.
*
* @param bytes the bytes
* @param start the start
* @param end the end
* @return the string
*/
public static String bytesToHex(byte bytes[], int start, int end) {
StringBuilder sb = new StringBuilder();
for (int i = start; i < start + end; i++) {
sb.append(byteToHex(bytes[i]));
}
return sb.toString();
}
/**
* Byte to hex.
*
* @param bt the bt
* @return the string
*/
public static String byteToHex(byte bt) {
return HEX_DIGITS[(bt & 0xf0) >> 4] + "" + HEX_DIGITS[bt & 0xf];
}
/**
* 獲取md5值.
*
* @param str the string
* @return md5串
* @throws IOException
*/
public static String getStringMD5(String str) {
StringBuilder sb = new StringBuilder();
try {
byte[] data = str.getBytes("utf-8");
MessageDigest MD5 = MessageDigest.getInstance("MD5");
MD5.update(data);
data = MD5.digest();
for (int i = 0; i < data.length; i++) {
sb.append(HEX_DIGITS[(data[i] & 0xf0) >> 4] + "" + HEX_DIGITS[data[i] & 0xf]);
}
} catch (Exception e) {
}
return sb.toString();
}
/**
* The main method.
*
* @param args the arguments
*/
public static void main(String[] args) {
long beginTime = System.currentTimeMillis();
File fileZIP = new File("D:\\BaiduNetdiskDownload\\test1.avi");
String md5 = "";
try {
md5 = getFileMD5String(fileZIP);
} catch (IOException e) {
e.printStackTrace();
}
long endTime = System.currentTimeMillis();
System.out.println("MD5:" + md5 + "\n time:" + ((endTime - beginTime)) + "ms");
System.out.println(getStringMD5("111111"));
}
}
6.HTTPClient
public class HttpclientUtil {
public static String doGet(String url) {
// 創建Httpclient對象
CloseableHttpClient httpclient = HttpClients.createDefault();
// 創建http GET請求
HttpGet httpGet = new HttpGet(url);
CloseableHttpResponse response = null;
try {
// 執行請求
response = httpclient.execute(httpGet);
// 判斷返回狀態是否爲200
HttpEntity entity = response.getEntity();
String result = EntityUtils.toString(entity, "UTF-8");
EntityUtils.consume(entity); //釋放資源
httpclient.close();
return result;
} catch (IOException e) {
e.printStackTrace();
return null;
} finally {
try {
httpclient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static String doPost(String url, Map<String, String> paramMap) {
// 創建Httpclient對象
CloseableHttpClient httpclient = HttpClients.createDefault();
// 創建http Post請求
HttpPost httpPost = new HttpPost(url);
CloseableHttpResponse response = null;
try {
if (paramMap != null) {
List<BasicNameValuePair> list = new ArrayList<>();
for (Map.Entry<String, String> entry : paramMap.entrySet()) {
list.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
}
HttpEntity httpEntity = new UrlEncodedFormEntity(list, "utf-8");
httpPost.setEntity(httpEntity);
}
// 執行請求
response = httpclient.execute(httpPost);
// 判斷返回狀態是否爲200
HttpEntity entity = response.getEntity();
String result = EntityUtils.toString(entity, "UTF-8");
EntityUtils.consume(entity); //釋放資源
httpclient.close();
return result;
} catch (IOException e) {
e.printStackTrace();
return null;
} finally {
try {
httpclient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}