JAVA常用工具类
总结的JAVA开发常用的工具类
一、获取本机IP和MAC地址
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
/**
* 获取本机IP和MAC地址的工具类
*
* @author CHX
*
*/
public class LocalIPAndMAC {
/**
* 获取mac地址的方法
*
* @param ia
* InetAddress对象
* @return mac地址
* @throws SocketException
*/
private static String getLocalMac(InetAddress ia) throws SocketException {
byte[] mac = NetworkInterface.getByInetAddress(ia).getHardwareAddress();
StringBuffer sb = new StringBuffer("");
for (int i = 0; i < mac.length; i++) {
if (i != 0) {
sb.append("-");
}
int temp = mac[i] & 0xff;
String str = Integer.toHexString(temp);
if (str.length() == 1) {
sb.append("0" + str);
} else {
sb.append(str);
}
}
return sb.toString().toUpperCase();
}
public static void main(String[] args) {
try {
System.out.println("本机IP为 :" + getMyIP());
} catch (UnknownHostException e1) {
e1.printStackTrace();
}
try {
System.out.println("本机mac地址为 :" + getLocalMac(InetAddress.getLocalHost()));
} catch (SocketException e) {
e.printStackTrace();
} catch (UnknownHostException e) {
e.printStackTrace();
}
}
/**
* 获取本机IP地址的方法
*
* @return ip地址
* @throws UnknownHostException
*/
public static String getMyIP() throws UnknownHostException {
return InetAddress.getLocalHost().getHostAddress();
}
}
也可以直接使用InetAddress.getLocalHost().getHostAddress()
二、简易版JAVA生成固定四位短连接
前言：利用base64与md5，生成定长四位的短连接(不包括域名)。本程序和网上的大多数都不同，如果有不对的地方希望能够指出。
举例：http://Nolog/asdasdasd/asdasda/aqwertyuiopasdfghjklzxcvbnm5132456789
效果：
代码：
package com.kh.pds.util; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.Base64; import java.util.regex.Matcher; import java.util.regex.Pattern; /** * 短网址的实现，不管多长，都生成四位链接 * * @author CHX */ public class ShortURL { private static String plainUrl = "http://Nolog/asdasdasd/asdasda/aqwertyuiopasdfghjklzxcvbnm5132456789"; private static String[] chars = new String[]{"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"}; public static void main(String[] args) { myTestShort(plainUrl, "Nolog"); } /** * 首先从URL中获取固定格式后的内容 * * @param longUrl 原url * @param yuMing 域名 */ public static void myTestShort(String longUrl, String yuMing) { String regex = "(http://|https://)" + yuMing + "(.*)"; Pattern r = Pattern.compile(regex); // 现在创建 matcher 对象 Matcher m = r.matcher(longUrl); if (m.find()) { String url = m.group(2); if (url != null) { // 此处就是生成的四位短连接 System.out.println(m.group(1) + yuMing + "/" + changes(url)); } } } /** * 编码思路：考虑到base64编码后，url中只有[0-9][a-z][A-Z]这几种字符，所有字符共有26+26+10=62种 对应的映射表为62进制即可 * * @param value * @return */ public static String changes(String value) { // 获取base64编码 String stringBase64 = stringBase64(value); // 去除最后的==(这是base64的特征，最后以==结尾) stringBase64 = stringBase64.substring(0, stringBase64.length() - 2); MessageDigest md5 = null; try { md5 = MessageDigest.getInstance("MD5"); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } // 利用md5生成32位固长字符串 String mid = new String(bytesToHexString(md5.digest(stringBase64.getBytes()))); StringBuilder outChars = new StringBuilder(); for (int i = 0; i < 4; i++) { //每八个一组 String sTempSubString = mid.substring(i * 8, i * 8 + 8); // 想办法将此16进制的八个字符数缩减到62以内，所以取余，然后置换为对应的字母数字 outChars.append(chars[(int) (Long.parseLong(sTempSubString, 16) % chars.length)]); } return outChars.toString(); } /** * 将字符串转换为base64编码 * * @param text 原文 * @return */ public static String stringBase64(String text) { return Base64.getEncoder().encodeToString(text.getBytes()); } /** * 将byte转换为16进制的字符串 * * @param src * @return */ public static String bytesToHexString(byte[] src) { StringBuilder stringBuilder = new StringBuilder(); if (src == null || src.length <= 0) { return null; } for (int i = 0; i < src.length; i++) { int v = src[i] & 0xFF; String hv = Integer.toHexString(v); if (hv.length() < 2) { stringBuilder.append(0); } stringBuilder.append(hv); } return stringBuilder.toString(); } }
三、获取指定类的绝对路径
/**
* 获取指定类的绝对路径
*
* @param c
* @return
*/
public static String getNowClassPath(Class<?> c) {
return c.getResource("").getPath().replaceFirst("/", "");
}
四、通过JAVA反射机制生成指定XML
import java.io.ByteArrayOutputStream;
import java.io.StringReader;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
public class xmlUtil{
/**
* 根据传入obj创建请求的xml
*
* @param obj
* 待生成的obj
* @param header
* 待生成的头公共域
* @return Document
* @throws Exception
*/
public Document createXmlObjectReq(Object obj, Object header, boolean ifBody) throws Exception {
// 创建公共域
DocumentBuilderFactory documentFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder doc = documentFactory.newDocumentBuilder();
Document root = doc.newDocument();
// 添加固定标签
Element transaction = root.createElement("Transaction");
Element transaction_Header = root.createElement("Transaction_Header");
Class<? extends Object> headClass = header.getClass();
Field[] headFields = headClass.getDeclaredFields();
for (int i = 0; i < headFields.length; i++) {
String fieldName = headFields[i].getName();
String methodName = "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);
Method method = headClass.getMethod(methodName, new Class[] {});
String invoke = (String) method.invoke(header, new Object[] {});
Element element = root.createElement(fieldName);
element.setTextContent(invoke);
transaction_Header.appendChild(element);
}
transaction.appendChild(transaction_Header);
root.appendChild(transaction);
if (ifBody) {
// 报文体
Element Transaction_Body = root.createElement("Transaction_Body");
// request
Element request = root.createElement("request");
Transaction_Body.appendChild(request);
Class<? extends Object> obcClass = obj.getClass();
Field[] objFields = obcClass.getDeclaredFields();
for (int i = 0; i < objFields.length; i++) {
String fieldName = objFields[i].getName();
String methodName = "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);
Method method = obcClass.getMethod(methodName, new Class[] {});
String invoke = (String) method.invoke(obj, new Object[] {});
Element Pyr_BkCgyCd = root.createElement(fieldName);
Pyr_BkCgyCd.setTextContent(invoke);
request.appendChild(Pyr_BkCgyCd);
}
transaction.appendChild(Transaction_Body);
}
return root;
}
public String xmlToString(Document root) throws Exception {
// 创建TransformerFactory对象
TransformerFactory tff = TransformerFactory.newInstance();
// 创建 Transformer对象
Transformer tf = tff.newTransformer();
tf.setOutputProperty("encoding", JianHangUtil.JH_CHART);
tf.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC, "yes");
tf.setOutputProperty(OutputKeys.INDENT, "yes");
// 去除standalone="no"
root.setXmlStandalone(true);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
tf.transform(new DOMSource(root), new StreamResult(bos));
String string = bos.toString();
bos.close();
return string;
}
}
五、生成指定位数(8位以上,且为偶数位)的ID
前排提示:该方法未经过正规测试，用于普通场景没问题(八位数-两千万次无重复)。效率一般，总之慎用。
main方法里是多线程测试，如果有输出，则说明有重复值。
真实使用时，去掉main方法及Runnable
package kh.pms.test;
import java.security.MessageDigest;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import kh.pms.tools.StringUtil;
/**
* 获取指定位数唯一id=生成uuid->加密md5(32位)->生成对应十六进制字符串->每两位一转换最终位数
*
* @author CHX
*
*/
public class UniqueIDUtil implements Runnable {
public static Map<String, String> code = new HashMap<String, String>();
private static String[] chars = new String[] { "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n",
"o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "0", "1", "2", "3", "4", "5", "6", "7", "8",
"9", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T",
"U", "V", "W", "X", "Y", "Z" };
/**
* 将字符串转换为指定长度字符串
*
* @param value
* @return
* @throws Exception
*/
public String getID(int length) throws Exception {
if (length < 8 || length % 2 != 0) {
return "";
}
String value = UUID.randomUUID().toString();
MessageDigest md5 = MessageDigest.getInstance("MD5");
int bit = 32 / length;
value = value.replaceAll("-", "");
value = StringUtil.getBaseStrBian(value.getBytes());
value = value.replaceAll("=", "");
byte[] digest = md5.digest(value.getBytes());
// 利用md5生成32位固长字符串
String mid = bytesToHexString(digest);
StringBuilder outChars = new StringBuilder();
for (int i = 0; i < length; i++) {
String sTempSubString = mid.substring(i * bit, i * bit + bit);
outChars.append(chars[(int) (Long.parseLong(sTempSubString, 16) % chars.length)]);
}
return outChars.toString();
}
/**
* 将byte转换为16进制的字符串
*
* @param src
* @return
*/
private String bytesToHexString(byte[] src) {
StringBuilder stringBuilder = new StringBuilder();
if (src == null || src.length <= 0) {
return null;
}
for (int i = 0; i < src.length; i++) {
int v = src[i] & 0xFF;
String hv = Integer.toHexString(v);
if (hv.length() < 2) {
stringBuilder.append(0);
}
stringBuilder.append(hv);
}
return stringBuilder.toString();
}
public static void main(String[] args) {
for (int i = 0; i < 20; i++) {
UniqueIDUtil idUtil = new UniqueIDUtil();
Thread thread = new Thread(idUtil);
thread.start();
}
}
@Override
public void run() {
for (int i = 0; i < 100000; i++) {
String id;
try {
id = getID(8);
synchronized (code) {
if (code.containsKey(id)) {
System.out.println(id);
} else {
code.put(id, id);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
六、字符串判空
前排提示：各个第三方jar包都提供字符串判空的方法，如果没有特殊情况请使用成熟的(如hutool)方法。我提供的方法并没有考虑效率及其他问题。
下面的方法特色为：可以输入多个字符串同时判空，并且认为undefined也为空的一种。
public boolean isNull(String... plains) {
if (plains == null || plains.length == 0) {
return true;
}
for (int i = 0; i < plains.length; i++) {
if (plains[i] == null || "".equals(plains[i].trim())
|| "undefined".toUpperCase().equals(plains[i].toUpperCase())
|| plains[i].length() == 0) {
return true;
}
}
return false;
}
七、获取一个月前的日期(举一反三)
//2.获取前一个月 Calendar startDT = Calendar.getInstance(); startDT.setTime(new Date()); startDT.add(Calendar.DAY_OF_MONTH, -1);
八、有关word操作
/** * 对请求下载word文件作出回应 * * @author chx * @param document * @param response * @param fileName * @return */ public static void exportWord(XWPFDocument document, HttpServletResponse response, String fileName) throws Exception { fileName = new String(fileName.getBytes("utf-8"), "ISO-8859-1"); response.setHeader("Content-Disposition", "attachment;fileName=" + fileName); response.setContentType("application/vnd.openxmlformats-officedocument.wordprocessingml.document"); OutputStream os = response.getOutputStream(); document.write(os); os.flush(); os.close(); }
本次只介绍poi操作word文档的方法！
maven引入版本号如下：
<poi.version>3.7</poi.version>
maven引入依赖如下:
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>${poi.version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>${poi.version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-scratchpad</artifactId>
<version>${poi.version}</version>
</dependency>
使用说明：我们的项目是提前准备好word模板，进行文字和图片替换，这要比直接生成word文档方便的多的多！！！如果前提不一致，只能去百度一下别的方法。
其中，文字和图片信息封装进Map里，图片是用Base64编码后的字符串。key值是有区别性的，比如文字以word开头，图片以img开头，这样才能在替换过程中知道是替换文字还是图片。
Map中的key值就是Word文档中的预留替换字。调用generateWord方法即可获取一个word文档，可以传给前端，也可写入文件，自行操作。
工具类代码如下：
package main; import lombok.extern.slf4j.Slf4j; import org.apache.poi.POIXMLDocument; import org.apache.poi.openxml4j.opc.OPCPackage; import org.apache.poi.xwpf.usermodel.*; import org.apache.xmlbeans.XmlException; import org.apache.xmlbeans.XmlToken; import org.openxmlformats.schemas.drawingml.x2006.main.CTNonVisualDrawingProps; import org.openxmlformats.schemas.drawingml.x2006.main.CTPositiveSize2D; import org.openxmlformats.schemas.drawingml.x2006.wordprocessingDrawing.CTInline; import java.io.ByteArrayInputStream; import java.io.IOException; import java.util.Base64; import java.util.Iterator; import java.util.List; import java.util.Map; /** * word * * @author chx * @date 2019/11/13 16:43 * @return */ @Slf4j public class CustomDocument extends XWPFDocument { public CustomDocument(OPCPackage pkg) throws IOException { super(pkg); } public CustomDocument() { super(); } /** * @param id * @param width 宽 * @param height 高 * @param paragraph 段落 */ public void createPicture(int id, int width, int height, XWPFParagraph paragraph) { int EMU = 9525; width *= EMU; height *= EMU; String blipId = getAllPictures().get(id).getPackageRelationship() .getId(); CTInline inline = paragraph.createRun().getCTR().addNewDrawing() .addNewInline(); String picXml = "" + "<a:graphic xmlns:a=\"http://schemas.openxmlformats.org/drawingml/2006/main\">" + " <a:graphicData uri=\"http://schemas.openxmlformats.org/drawingml/2006/picture\">" + " <pic:pic xmlns:pic=\"http://schemas.openxmlformats.org/drawingml/2006/picture\">" + " <pic:nvPicPr>" + " <pic:cNvPr id=\"" + id + "\" name=\"Generated\"/>" + " <pic:cNvPicPr/>" + " </pic:nvPicPr>" + " <pic:blipFill>" + " <a:blip r:embed=\"" + blipId + "\" xmlns:r=\"http://schemas.openxmlformats.org/officeDocument/2006/relationships\"/>" + " <a:stretch>" + " <a:fillRect/>" + " </a:stretch>" + " </pic:blipFill>" + " <pic:spPr>" + " <a:xfrm>" + " <a:off x=\"0\" y=\"0\"/>" + " <a:ext cx=\"" + width + "\" cy=\"" + height + "\"/>" + " </a:xfrm>" + " <a:prstGeom prst=\"rect\">" + " <a:avLst/>" + " </a:prstGeom>" + " </pic:spPr>" + " </pic:pic>" + " </a:graphicData>" + "</a:graphic>"; inline.addNewGraphic().addNewGraphicData(); XmlToken xmlToken = null; try { xmlToken = XmlToken.Factory.parse(picXml); } catch (XmlException xe) { xe.printStackTrace(); } inline.set(xmlToken); inline.setDistT(0); inline.setDistB(0); inline.setDistL(0); inline.setDistR(0); CTPositiveSize2D extent = inline.addNewExtent(); extent.setCx(width); extent.setCy(height); CTNonVisualDrawingProps docPr = inline.addNewDocPr(); docPr.setId(id); docPr.setName("图片名称"); docPr.setDescr("描述信息"); } /** * 根据指定的参数值、模板，生成 word 文档 * * @param param 需要替换的变量 * @param template 模板 */ public XWPFDocument generateWord(Map<String, Object> param, String template, boolean isTable, int index) throws IOException { OPCPackage pack = POIXMLDocument.openPackage(template); CustomDocument doc = new CustomDocument(pack); List<XWPFParagraph> paragraphList = doc.getParagraphs(); return processParagraphs(paragraphList, param, doc, isTable, index); } /** * 处理段落 * * @param paragraphList */ public XWPFDocument processParagraphs(List<XWPFParagraph> paragraphList, Map<String, Object> param, CustomDocument doc, boolean isTable, int index) { if (paragraphList != null && paragraphList.size() > 0) { for (XWPFParagraph paragraph : paragraphList) { List<XWPFRun> runs = paragraph.getRuns(); for (XWPFRun run : runs) { String text = run.getText(0); if (text != null) { boolean isSetText = false; for (Map.Entry<String, Object> entry : param.entrySet()) { String key = entry.getKey(); if (text.indexOf(key) != -1) { isSetText = true; String value = entry.getValue().toString(); if (!key.contains("IMG")) { text = text.replace(key, value); } else if (key.contains("IMG")) { byte[] decode = GenerateImage(value); text = text.replace(key, ""); ByteArrayInputStream byteInputStream = new ByteArrayInputStream(decode); try { int ind = doc.addPicture(byteInputStream, CustomDocument.PICTURE_TYPE_PNG); doc.createPicture(ind, 550, 340, paragraph); } catch (Exception e) { e.printStackTrace(); } } } } if (isSetText) { run.setText(text, 0); } } } } if (isTable) { //进行表格文字替换 Iterator<XWPFTable> it = doc.getTablesIterator(); int flag = 0; while (it.hasNext()) { XWPFTable nowTable = it.next(); List<XWPFTableRow> rows = nowTable.getRows(); List<List<Object>> sypcjcb = null; if (flag == 0 && index == 1) { sypcjcb = (List<List<Object>>) param.get("ZWTABLE"); } else if (flag == 0 && index == 2) { sypcjcb = (List<List<Object>>) param.get("SYPCJCB"); } else if (flag == 1 && index == 2) { sypcjcb = (List<List<Object>>) param.get("SYPCB"); } else if (flag == 2 && index == 2) { sypcjcb = (List<List<Object>>) param.get("JGCGJEB"); } if (sypcjcb != null) { //将每行数据替换 for (int i = 0; i < rows.size(); i++) { List<XWPFTableCell> tableCells = rows.get(i).getTableCells(); for (int j = 0; j < tableCells.size(); j++) { tableCells.get(j).setText(sypcjcb.get(i).get(j).toString()); } } } flag++; } } } return doc; } public byte[] GenerateImage(String imgStr) { imgStr = imgStr.replaceAll("data:image/png;base64,", "").replaceAll("\\r\\n", ""); byte[] b = Base64.getDecoder().decode(imgStr); for (int i = 0; i < b.length; ++i) { if (b[i] < 0) { b[i] += 256; } } return b; } }
九、读写文件工具类
import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.FileWriter; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.io.Reader; public class FileUtil { /** * 按行读取文件 */ public static String ReadFileByLine(String filename) { File file = new File(filename); InputStream is = null; Reader reader = null; BufferedReader bufferedReader = null; StringBuilder result = new StringBuilder(); try { is = new FileInputStream(file); reader = new InputStreamReader(is); bufferedReader = new BufferedReader(reader); String line; while ((line = bufferedReader.readLine()) != null) { result.append(line); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { try { if (null != bufferedReader) bufferedReader.close(); if (null != reader) reader.close(); if (null != is) is.close(); } catch (IOException e) { e.printStackTrace(); } } return result.toString(); } /** * 按字符读取文件 * * @param filename */ public static String ReadFileByChar(String filename) { File file = new File(filename); InputStream is = null; Reader isr = null; StringBuilder result = new StringBuilder(); try { is = new FileInputStream(file); isr = new InputStreamReader(is); int index; while (-1 != (index = isr.read())) { result.append((char) index); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { try { if (null != is) is.close(); if (null != isr) isr.close(); } catch (IOException e) { e.printStackTrace(); } } return result.toString(); } /** * 通过OutputStreamWriter写文件 * * @param filename */ public static void Write2FileByOutputStream(String filename, String context) { File file = new File(filename); FileOutputStream fos = null; OutputStreamWriter osw = null; try { if (!file.exists()) { file.createNewFile(); } fos = new FileOutputStream(file); osw = new OutputStreamWriter(fos); osw.write(context); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if (osw != null) { try { osw.close(); } catch (IOException e) { e.printStackTrace(); } } if (null != fos) { try { fos.close(); } catch (IOException e) { e.printStackTrace(); } } } } /** * 通过BufferedWriter写文件 * * @param filename */ public static void Write2FileByBuffered(String filename, String context) { File file = new File(filename); FileOutputStream fos = null; OutputStreamWriter osw = null; BufferedWriter bw = null; try { if (!file.exists()) { file.createNewFile(); } fos = new FileOutputStream(file); osw = new OutputStreamWriter(fos); bw = new BufferedWriter(osw); bw.write(context); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if (null != bw) { try { bw.close(); } catch (IOException e) { e.printStackTrace(); } } if (null != osw) { try { osw.close(); } catch (IOException e) { e.printStackTrace(); } } if (null != fos) { try { fos.close(); } catch (IOException e) { e.printStackTrace(); } } } } /** * 通过FileWriter写文件 * * @param filename */ public static void Write2FileByFileWriter(String filename, String context) { File file = new File(filename); FileWriter fw = null; try { if (!file.exists()) { file.createNewFile(); } fw = new FileWriter(file); fw.write(context); } catch (IOException e) { e.printStackTrace(); } finally { if (null != fw) { try { fw.close(); } catch (IOException e) { e.printStackTrace(); } } } } }
十、获取某些下载页面的链接(有些下载页面有问题，无法直接全选下载，此时可以用此demo获取所有链接)
package tmp; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.Reader; import java.util.regex.Matcher; import java.util.regex.Pattern; public class UrlGet { private static String tou = "onclick=\"window\\.open\\('"; private static String wei = "\'"; public static void main(String[] args) { regexs(readFileByLineBank("C:\\Users\\chx\\Desktop\\urls.txt")); } public static void regexs(String context){ Pattern pattern = Pattern.compile(tou+"(.*?)"+wei); Matcher m = pattern.matcher(context); while(m.find()){ System.out.println(m.group(1)); } } public static String readFileByLineBank(String filename) { File file = new File(filename); InputStream is = null; Reader reader = null; BufferedReader bufferedReader = null; StringBuilder sb = new StringBuilder(); try { is = new FileInputStream(file); reader = new InputStreamReader(is,"UTF-8"); bufferedReader = new BufferedReader(reader); String line; while ((line = bufferedReader.readLine()) != null) { sb.append(line); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { try { if (null != bufferedReader){ bufferedReader.close(); } if (null != reader){ reader.close(); } if (null != is){ is.close(); } } catch (IOException e) { e.printStackTrace(); } } return sb.toString(); } }
比如 onclick="window.open('http://xunlei/xxx/1234.mp4')" 即将程序的tou属性设置为(注意转义！！！！)onclick=\"window\\.open\\('
十一、通过经纬度获取直线距离。
private static double EARTH_RADIUS = 6378.137; private double getDistance(double lat1, double lng1, double lat2, double lng2) { double radLat1 = rad(lat1); double radLat2 = rad(lat2); double a = radLat1 - radLat2; double b = rad(lng1) - rad(lng2); double s = 2 * Math.asin(Math.sqrt( Math.pow(Math.sin(a / 2), 2) + Math.cos(radLat1) * Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2))); s = s * EARTH_RADIUS; s = Math.round(s * 10000d) / 10000d; s = s * 1000; return s; } private double rad(double d) { return d * Math.PI / 180.0; }
十二、FTP交互工具
import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import org.apache.commons.net.ftp.FTPClient; import org.apache.commons.net.ftp.FTPFile; import org.apache.commons.net.ftp.FTPReply; public class FTPUtil { /** * 用户名 */ private String uName; /** * 密码 */ private String uPass; /** * 目标IP */ private String goalIP; /** * 目标端口 */ private int goalPort; /** * ftp相对地址 */ private String remotePath; /** * 初始化参数 * * @param goalIp * @param goalPort * @param remotePath */ public void initParam(String goalIp, int goalPort, String remotePath) { this.goalIP = goalIp; this.goalPort = goalPort; this.remotePath = remotePath; } /** * 从FTP下载文件 * * @param fileName * @param savePath * @return */ public boolean downloadFile(String fileName, String savePath) { if (isNullOrUndefined(savePath, goalIP, String.valueOf(goalPort), remotePath)) { new NullPointerException("savePath保存路径不能为空或先调用initParam()"); return false; } FTPClient ftp = new FTPClient(); OutputStream is = null; boolean reuslt = false; try { ftp.connect(goalIP, goalPort); if (!isNullOrUndefined(uName, uPass)) { ftp.login(uName, uPass); } ftp.setFileType(FTPClient.BINARY_FILE_TYPE);// 文件类型为二进制文件 if (FTPReply.isPositiveCompletion(ftp.getReplyCode())) { ftp.enterLocalPassiveMode();// 本地模式 ftp.changeWorkingDirectory(remotePath);// 转移到FTP服务器目录 FTPFile[] fs = ftp.listFiles(); for (FTPFile ff : fs) { if (ff.getName().equals(fileName)) { File localFile = new File(savePath + fileName); is = new FileOutputStream(localFile); ftp.retrieveFile(ff.getName(), is); reuslt = true; break; } } } ftp.logout(); } catch (IOException e) { return false; } finally { if (ftp.isConnected()) { try { ftp.disconnect(); } catch (IOException e) { e.printStackTrace(); return false; } } if (is != null) { try { is.close(); } catch (IOException e) { return false; } } } return reuslt; } public String getuPass() { return uPass; } public void setuPass(String uPass) { this.uPass = uPass; } public String getuName() { return uName; } public void setuName(String uName) { this.uName = uName; } public String getGoalIP() { return goalIP; } public void setGoalIP(String goalIP) { this.goalIP = goalIP; } public int getGoalPort() { return goalPort; } public void setGoalPort(int goalPort) { this.goalPort = goalPort; } /** * 判断是否为空 * * @param plains * @return */ public boolean isNullOrUndefined(String... plains) { if (plains == null) { return true; } for (int i = 0; i < plains.length; i++) { if (plains[i] == null || "".equals(plains[i]) || plains[i].length() == 0 || "undefined".equals(plains[i]) || "null".equals(plains[i])) { return true; } } return false; } }
十三、获取整个文件MD5(非文件内容MD5)
/** * 获取文件的md5 * * @param file * @return * @throws Exception */ public String getMd5ByFile(File file) throws Exception { FileInputStream in = new FileInputStream(file); MessageDigest md = MessageDigest.getInstance("MD5"); MappedByteBuffer byteBuffer = in.getChannel().map(FileChannel.MapMode.READ_ONLY, 0, file.length()); md.update(byteBuffer); byte[] b = md.digest(); in.close(); return byteToHexString(b); } /** * 十六进制转字符串 * * @param tmp * @return */ private String byteToHexString(byte[] tmp) { String s; char str[] = new char[16 * 2]; int k = 0; for (int i = 0; i < 16; i++) { byte byte0 = tmp[i]; str[k++] = hexDigits[byte0 >>> 4 & 0xf]; str[k++] = hexDigits[byte0 & 0xf]; } s = new String(str); return s; }
