工具类!!!!

来段文件拷贝的代码:

import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; public class Demo1 { public static void main(String[] args) { String src = "c://1.txt"; String dest = "c://2.txt"; try { System.out.println("开始拷贝！！"); copy(src,dest); System.out.println("拷贝成功！！"); } catch (FileNotFoundException e) { System.out.println(e.getMessage()); }catch (IOException e) { System.out.println("由于未知的原因，导致文件拷贝失败！！"); } } /** * 拷贝目标资源到文件中 * @param src : 指定目标资源 * @param dest ：指定需要写入的文件 * @throws IOException ： 如果文件读取过程中，出现了未知错误，则会抛出IOException */ private static void copy(String src, String dest) throws IOException { InputStream in = readFile(src); writeToFile(in,dest); } /** * 读取文件，并使用InputStream关联需要读取的文件 * @param src ： 指定需要读取的文件 * @return： 返回与文件相关联的流 * @throws FileNotFoundException */ private static InputStream readFile(String src) throws FileNotFoundException { //1.检测文件是否存在 if(!existFile(src)){ throw new FileNotFoundException("指定目标资源不存在！！"); } //2.读取文件 FileInputStream in = new FileInputStream(src); return in; } /** * 判断文件是否存在 * @param src ： 需要判断的文件 * @return ：如果存在则返回true，否则false */ private static boolean existFile(String src) { File file = new File(src); if(file.exists()){ return true; } return false; } /** * * @param in * @param dest * @throws IOException */ private static void writeToFile(InputStream in, String dest) throws IOException { if(!existFile(dest)){ File file = new File(dest); file.createNewFile(); } FileOutputStream out = new FileOutputStream(dest); inToOut(in,out); } /** * * @param in * @param out * @throws IOException */ private static void inToOut(InputStream in, FileOutputStream out) throws IOException { try{ int len = 0; byte buffer[] = new byte[1024]; while((len=in.read( buffer))>0){ out.write(buffer,0,len); } }finally{ if(in!=null){ in.close(); } if(out!=null){ out.close(); } } } }  

 

操作数据库JDBC工具类

import java.io.InputStream; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.Properties; public class JdbcUtils { private static Properties prop = new Properties(); static{ try{ InputStream in = JdbcUtils.class.getClassLoader().getResourceAsStream("db.properties"); prop.load(in); Class.forName(prop.getProperty("driver")); }catch (Exception e) { throw new ExceptionInInitializerError(e); } } public static Connection getConnection() throws SQLException{ return DriverManager.getConnection(prop.getProperty("url"), prop.getProperty("username"), prop.getProperty("password")); } public static void release(Connection conn,Statement st,ResultSet rs){ if(rs!=null){ try{ rs.close(); }catch (Exception e) {} } if(st!=null){ try{ st.close(); }catch (Exception e) {} } if(conn!=null){ try{ conn.close(); }catch (Exception e) {} } } }

MD5加密

package com.wangs.utils; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import sun.misc.BASE64Encoder; public class ServiceUtils { public static final String token = "12412214213"; public static String md5(String password){ MessageDigest md5; try { md5 = MessageDigest.getInstance("md5"); byte[] md = md5.digest((password+token).getBytes()); BASE64Encoder encode = new BASE64Encoder(); return encode.encode(md); } catch (NoSuchAlgorithmException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } }

commons.beanutils.BeanUtils拷贝Bean

package com.wangs.utils; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Map; import java.util.UUID; import javax.servlet.http.HttpServletRequest; import com.sun.org.apache.commons.beanutils.BeanUtils; import com.sun.org.apache.commons.beanutils.ConvertUtils; import com.sun.org.apache.commons.beanutils.Converter; public class WebUtils { public static <T> T request2Bean(HttpServletRequest request, Class<T> beanClass) { try { T t = beanClass.newInstance(); Map map = request.getParameterMap(); ConvertUtils.register(new Converter() { public Object convert(Class type, Object value) { if (value == null || value == "") { return null; } if (!(value instanceof String)) { throw new RuntimeException("不支持的类型!"); } String str = (String) value; SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); try { return format.parse(str); } catch (ParseException e) { throw new RuntimeException(e); } } }, Date.class); BeanUtils.populate(t, map); // 将封装的map转换成Bean类 return t; } catch (Exception e) { throw new RuntimeException(e); } } public static void copyBean(Object src,Object dest){ try{ ConvertUtils.register(new Converter(){ public Object convert(Class type, Object value) { if(value==null || value.equals("")){ return null; } if(!(value instanceof String)){ throw new RuntimeException("不支持该数据类型的转换"); } String s = (String) value; SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd"); try { return df.parse(s); } catch (ParseException e) { throw new RuntimeException(e); } } }, Date.class); BeanUtils.copyProperties(dest, src); }catch (Exception e) { throw new RuntimeException(e); } } public static String generatorUID(){ return UUID.randomUUID().toString(); } }

解析XML,读和写操作

package com.wangs.utils; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.UnsupportedEncodingException; import org.dom4j.Document; import org.dom4j.io.OutputFormat; import org.dom4j.io.SAXReader; import org.dom4j.io.XMLWriter; public class XMLUtils { private static String filePath = null; static { filePath = XMLUtils.class.getClassLoader().getResource("users.xml").getPath(); } public static Document getDocument() throws Exception{ SAXReader reader = new SAXReader(); FileInputStream in = new FileInputStream(filePath); Document document = reader.read(in); return document; } public static void write2Xml(Document document) throws Exception{ OutputFormat format = OutputFormat.createPrettyPrint(); format.setEncoding("UTF-8"); XMLWriter write = new XMLWriter(new FileOutputStream(filePath),format); write.write(document); write.close(); } }

验证码:
package com.wangs.utils; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.IOException; import java.io.OutputStream; import java.util.Random; import javax.imageio.ImageIO; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class ImageServlet extends HttpServlet { private static final int WIDTH = 130; private static final int HEIGHT = 30; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { BufferedImage image = new BufferedImage(WIDTH,HEIGHT,BufferedImage.TYPE_INT_RGB); Graphics g = image.getGraphics(); setBackground(g); setBorder(g); drawRandomLine(g); String random = drawRandomNum((Graphics2D) g); request.getSession().setAttribute("checkcode", random); //把验证码作为session传递 //response.setHeader("content-type", "image/jpeg"); //Expires: -1 //Cache-Control: no-cache //Pragma: no-cache //下面的代码一定不能少 response.setDateHeader("Expires", -1); response.setHeader("Cache-Control", "no-cache"); response.setHeader("Pragma", "no-cache"); response.setContentType("image/jpeg"); OutputStream out = response.getOutputStream(); ImageIO.write(image, "jpg", out); } private void setBackground(Graphics g) { g.setColor(Color.WHITE); g.fillRect(0, 0, WIDTH, HEIGHT); } private void setBorder(Graphics g) { g.setColor(Color.BLUE); g.drawRect(1, 1, WIDTH-2, HEIGHT-2); } private void drawRandomLine(Graphics g) { g.setColor(Color.GREEN); for(int i=0;i<5;i++){ int x1 = new Random().nextInt(WIDTH); int y1 = new Random().nextInt(HEIGHT); int x2 = new Random().nextInt(WIDTH); int y2 = new Random().nextInt(HEIGHT); g.drawLine(x1, y1, x2, y2); } } //[/u4e00-/u9fa5] 30*3.14/180 private String drawRandomNum(Graphics2D g) { g.setColor(Color.RED); g.setFont(new Font("宋体",Font.BOLD,20)); String base = "/u7684/u4e00/u4e86/u662f/u6211/u4e0d/u5728/u4eba/u4eec/u6709/u6765/u4ed6/u8fd9/u4e0a/u7740/u4e2a/u5730/u5230/u5927/u91cc/u8bf4/u5c31/u53bb/u5b50/u5f97/u4e5f/u548c/u90a3/u8981/u4e0b/u770b/u5929/u65f6/u8fc7/u51fa/u5c0f/u4e48/u8d77/u4f60/u90fd/u628a/u597d/u8fd8/u591a/u6ca1/u4e3a/u53c8/u53ef/u5bb6/u5b66/u53ea/u4ee5/u4e3b/u4f1a/u6837/u5e74/u60f3/u751f/u540c/u8001/u4e2d/u5341/u4ece/u81ea/u9762/u524d/u5934/u9053/u5b83/u540e/u7136/u8d70/u5f88/u50cf/u89c1/u4e24/u7528/u5979/u56fd/u52a8/u8fdb/u6210/u56de/u4ec0/u8fb9/u4f5c/u5bf9/u5f00/u800c/u5df1/u4e9b/u73b0/u5c71/u6c11/u5019/u7ecf/u53d1/u5de5/u5411/u4e8b/u547d/u7ed9/u957f/u6c34/u51e0/u4e49/u4e09/u58f0/u4e8e/u9ad8/u624b/u77e5/u7406/u773c/u5fd7/u70b9/u5fc3/u6218/u4e8c/u95ee/u4f46/u8eab/u65b9/u5b9e/u5403/u505a/u53eb/u5f53/u4f4f/u542c/u9769/u6253/u5462/u771f/u5168/u624d/u56db/u5df2/u6240/u654c/u4e4b/u6700/u5149/u4ea7/u60c5/u8def/u5206/u603b/u6761/u767d/u8bdd/u4e1c/u5e2d/u6b21/u4eb2/u5982/u88ab/u82b1/u53e3/u653e/u513f/u5e38/u6c14/u4e94/u7b2c/u4f7f/u5199/u519b/u5427/u6587/u8fd0/u518d/u679c/u600e/u5b9a/u8bb8/u5feb/u660e/u884c/u56e0/u522b/u98de/u5916/u6811/u7269/u6d3b/u90e8/u95e8/u65e0/u5f80/u8239/u671b/u65b0/u5e26/u961f/u5148/u529b/u5b8c/u5374/u7ad9/u4ee3/u5458/u673a/u66f4/u4e5d/u60a8/u6bcf/u98ce/u7ea7/u8ddf/u7b11/u554a/u5b69/u4e07/u5c11/u76f4/u610f/u591c/u6bd4/u9636/u8fde/u8f66/u91cd/u4fbf/u6597/u9a6c/u54ea/u5316/u592a/u6307/u53d8/u793e/u4f3c/u58eb/u8005/u5e72/u77f3/u6ee1/u65e5/u51b3/u767e/u539f/u62ff/u7fa4/u7a76/u5404/u516d/u672c/u601d/u89e3/u7acb/u6cb3/u6751/u516b/u96be/u65e9/u8bba/u5417/u6839/u5171/u8ba9/u76f8/u7814/u4eca/u5176/u4e66/u5750/u63a5/u5e94/u5173/u4fe1/u89c9/u6b65/u53cd/u5904/u8bb0/u5c06/u5343/u627e/u4e89/u9886/u6216/u5e08/u7ed3/u5757/u8dd1/u8c01/u8349/u8d8a/u5b57/u52a0/u811a/u7d27/u7231/u7b49/u4e60/u9635/u6015/u6708/u9752/u534a/u706b/u6cd5/u9898/u5efa/u8d76/u4f4d/u5531/u6d77/u4e03/u5973/u4efb/u4ef6/u611f/u51c6/u5f20/u56e2/u5c4b/u79bb/u8272/u8138/u7247/u79d1/u5012/u775b/u5229/u4e16/u521a/u4e14/u7531/u9001/u5207/u661f/u5bfc/u665a/u8868/u591f/u6574/u8ba4/u54cd/u96ea/u6d41/u672a/u573a/u8be5/u5e76/u5e95/u6df1/u523b/u5e73/u4f1f/u5fd9/u63d0/u786e/u8fd1/u4eae/u8f7b/u8bb2/u519c/u53e4/u9ed1/u544a/u754c/u62c9/u540d/u5440/u571f/u6e05/u9633/u7167/u529e/u53f2/u6539/u5386/u8f6c/u753b/u9020/u5634/u6b64/u6cbb/u5317/u5fc5/u670d/u96e8/u7a7f/u5185/u8bc6/u9a8c/u4f20/u4e1a/u83dc/u722c/u7761/u5174/u5f62/u91cf/u54b1/u89c2/u82e6/u4f53/u4f17/u901a/u51b2/u5408/u7834/u53cb/u5ea6/u672f/u996d/u516c/u65c1/u623f/u6781/u5357/u67aa/u8bfb/u6c99/u5c81/u7ebf/u91ce/u575a/u7a7a/u6536/u7b97/u81f3/u653f/u57ce/u52b3/u843d/u94b1/u7279/u56f4/u5f1f/u80dc/u6559/u70ed/u5c55/u5305/u6b4c/u7c7b/u6e10/u5f3a/u6570/u4e61/u547c/u6027/u97f3/u7b54/u54e5/u9645/u65e7/u795e/u5ea7/u7ae0/u5e2e/u5566/u53d7/u7cfb/u4ee4/u8df3/u975e/u4f55/u725b/u53d6/u5165/u5cb8/u6562/u6389/u5ffd/u79cd/u88c5/u9876/u6025/u6797/u505c/u606f/u53e5/u533a/u8863/u822c/u62a5/u53f6/u538b/u6162/u53d4/u80cc/u7ec6"; StringBuffer sb = new StringBuffer(); int x = 10; for(int i=0;i<4;i++){ String ch = base.charAt(new Random().nextInt(base.length()))+""; sb.append(ch); //写入字之前，设置好旋转 int degree = new Random().nextInt()%30; g.rotate(degree*Math.PI/180, x, 20); g.drawString(ch, x, 20); g.rotate(-degree*Math.PI/180, x, 20); x = x+30; } return sb.toString(); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }