连接数据库
db.properties
url=jdbc\:MysqL\://localhost\:3306/csdn?useUnicode\=true&characterEncoding\=UTF-8 user=root pass=113 driverClassName=com.MysqL.jdbc.Driver@H_403_23@工具包DBConn.java
package util; import java.io.IOException; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.sqlException; import java.util.Properties; public class DBConn { private static Connection conn; private DBConn() { } public static Connection getConn() { if (conn == null) { // 创建集合对象 Properties properties = new Properties(); try { // 装载 properties.load(DBConn.class.getClassLoader() .getResourceAsStream("db.properties")); // 加载驱动程序 Class.forName(properties.getProperty("driverClassName")); // 获取连接对象 conn = DriverManager.getConnection( properties.getProperty("url"),properties.getProperty("user"),properties.getProperty("pass")); conn.setAutoCommit(false); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } return conn; } /** * 单个数据的增加更新删除的事务处理 * @param sql * @param params * @param pstmt */ public static void update(String sql,Object params[],PreparedStatement pstmt) { try { pstmt = getConn().prepareStatement(sql); for (int i = 0; i < params.length; i++) { pstmt.setObject(i + 1,params[i]); } pstmt.executeUpdate(); conn.commit(); } catch (Exception e) { try { conn.rollback(); } catch (sqlException e1) { e1.printStackTrace(); } e.printStackTrace(); } finally { release(null,pstmt); } } public static void release(ResultSet rs,PreparedStatement pstmt) { if (rs != null) { try { rs.close(); } catch (sqlException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if (pstmt != null) { try { pstmt.close(); } catch (sqlException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } @H_403_23@
读取数据库的信息
UserDomian.java
package www.csdn.net.user.domian; public class UserDomian { private Integer id; private String name; private String pass; public UserDomian() { // TODO Auto-generated constructor stub } public UserDomian(Integer id,String name,String pass) { super(); this.id = id; this.name = name; this.pass = pass; } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPass() { return pass; } public void setPass(String pass) { this.pass = pass; } @Override public String toString() { return "UserDomian [id=" + id + ",name=" + name + ",pass=" + pass + "]"; } } @H_403_23@
实现增删查改功能UserDo.java
package www.csdn.net.user.dao; import java.util.List; import www.csdn.net.user.domian.UserDomian; public interface UserDo { void insert(UserDomian entity) throws Exception; void update(UserDomian entity) throws Exception; void delete(UserDomian entity) throws Exception; void deleteById(Integer id) throws Exception; List<UserDomian> findAll() throws Exception; UserDomian findById(Integer id) throws Exception; /** * 用户登录验证 */ UserDomian checkLogin(String name,String pass) throws Exception; /** * 批量删除操作 */ void deletes(Integer ids[]) throws Exception; /** * 分页处理 */ List<UserDomian> findNowPageInfo(int nowpage) throws Exception; /** * 总页 */ Integer getCountPage() throws Exception; /** * 判断用户信息是否存在 */ boolean checkName(String name) throws Exception; } @H_403_23@
实现接口的类UserDoImpl.java
package www.csdn.net.user.dao.impl; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.util.ArrayList; import java.util.List; import util.DBConn; import www.csdn.net.user.dao.UserDo; import www.csdn.net.user.domian.UserDomian; public class UserDoImpl implements UserDo { private Connection conn; private PreparedStatement pstmt; private ResultSet rs; final int PAGESIZE = 10; @Override public void insert(UserDomian entity) throws Exception { String sql = "insert into user (name,pass) values(?,?)"; DBConn.update(sql,new Object[] { entity.getName(),entity.getPass() },pstmt); } @Override public void update(UserDomian entity) throws Exception { String sql = "update user set name=?,pass=? where id=?"; DBConn.update(sql,entity.getPass(),entity.getId() },pstmt); } @Override public void delete(UserDomian entity) throws Exception { String sql = "delete from user where id=?"; DBConn.update(sql,new Object[] { entity.getId() },pstmt); } @Override public void deleteById(Integer id) throws Exception { String sql = "delete from user where id=?"; DBConn.update(sql,new Object[] { id },pstmt); } @Override public List<UserDomian> findAll() throws Exception { List<UserDomian> entities = new ArrayList<UserDomian>(); String sql = "select id,name,pass from user "; conn = DBConn.getConn(); pstmt = conn.prepareStatement(sql); rs = pstmt.executeQuery(); while (rs.next()) { UserDomian entity = new UserDomian(); entity.setId(rs.getInt("id")); entity.setName(rs.getString("name")); entity.setPass(rs.getString("pass")); entities.add(entity); } return entities; } @Override public UserDomian findById(Integer id) throws Exception { UserDomian entity = null; String sql = "select id,pass from user where id=?"; conn = DBConn.getConn(); pstmt = conn.prepareStatement(sql); int index = 1; pstmt.setInt(index++,id); rs = pstmt.executeQuery(); if (rs.next()) { entity = new UserDomian(); entity.setId(rs.getInt("id")); entity.setName(rs.getString("name")); entity.setPass(rs.getString("pass")); } return entity; } @Override public UserDomian checkLogin(String name,String pass) throws Exception { UserDomian entity = null; String sql = "select id,pass from user where name=? and pass=?"; conn = DBConn.getConn(); pstmt = conn.prepareStatement(sql); int index = 1; pstmt.setString(index++,name); pstmt.setString(index++,pass); rs = pstmt.executeQuery(); if (rs.next()) { entity = new UserDomian(); entity.setId(rs.getInt("id")); entity.setName(rs.getString("name")); entity.setPass(rs.getString("pass")); } return entity; } @Override public void deletes(Integer[] ids) throws Exception { conn = DBConn.getConn(); try { for (int i = 0; i < ids.length; i++) { String sql = "delete from user where id=?"; pstmt = conn.prepareStatement(sql); pstmt.setInt(1,ids[i]); pstmt.executeUpdate(); // pstmt.addBatch(); } // pstmt.executeBatch(); conn.commit(); } catch (Exception e) { conn.rollback(); e.printStackTrace(); } } @Override public List<UserDomian> findNowPageInfo(int nowpage) throws Exception { List<UserDomian> entities = new ArrayList<UserDomian>(); String sql = "select id,pass from user limit ?,?"; conn = DBConn.getConn(); pstmt = conn.prepareStatement(sql); int index = 1; pstmt.setInt(index++,(nowpage - 1) * PAGESIZE); pstmt.setInt(index++,PAGESIZE); rs = pstmt.executeQuery(); while (rs.next()) { UserDomian entity = new UserDomian(); entity.setId(rs.getInt("id")); entity.setName(rs.getString("name")); entity.setPass(rs.getString("pass")); entities.add(entity); } return entities; } // 总页数 @Override public Integer getCountPage() throws Exception { String sql = "select count(*) as c from user"; conn = DBConn.getConn(); pstmt = conn.prepareStatement(sql); rs = pstmt.executeQuery(); while (rs.next()) { int countsize = rs.getInt("c"); return countsize % PAGESIZE == 0 ? countsize / PAGESIZE : countsize / PAGESIZE + 1; } return null; } @Override public boolean checkName(String name) throws Exception { boolean flag = false; String sql = "select id,pass from user where name=?"; conn = DBConn.getConn(); pstmt = conn.prepareStatement(sql); int index = 1; pstmt.setString(index++,name); rs = pstmt.executeQuery(); if (rs.next()) { flag = true; } return flag; } } @H_403_23@
验证码RandomImage .java
package img; import java.awt.Color; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.util.Random; /** * 验证码 * @author yanmei * */ public class RandomImage { private final static int W=80; private final static int H=30; public static BufferedImage createImage(){ //创建图片 BufferedImage image=new BufferedImage(W,H,BufferedImage.TYPE_INT_RGB); //得到图形绘制的对象 Graphics g=image.getGraphics(); //设置背景颜色 setBackGroud(g); //设置边框 setBorder(g); //绘制内容 drawContent(g); //绘制干扰线 drawDisturbline(g); return image; } private static void drawDisturbline(Graphics g) { g.setColor(Color.blue); Random r=new Random(); for (int i = 0; i < 4; i++) { int x1 = r.nextInt(W); int y1 = r.nextInt(H); int x2 = r.nextInt(W); int y2 = r.nextInt(H); g.drawLine(x1,y1,x2,y2); } } private static void drawContent(Graphics g) { // TODO Auto-generated method stub //字节资源 String re = "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"; //获取字符的长度 int length=re.length(); //随机操作对象 Random r=new Random(); //存储字符的对象 StringBuffer sb=new StringBuffer(); for (int i = 0; i < 4; i++) { //随机产生数字 int index=r.nextInt(length); //获取字符 char c=re.charAt(index); sb.append(c); } g.setColor(Color.black); g.drawString(sb.toString(),20,20); } private static void setBorder(Graphics g) { g.setColor(Color.black); g.drawRect(0,W-2,H-2); } private static void setBackGroud(Graphics g) { // 绘制矩形 g.setColor(Color.yellow); g.fillRect(0,W,H); } } @H_403_23@
package www.csdn.net.ajax.servlet; import java.awt.Color; import java.awt.Graphics; import java.io.IOException; 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; import img.RandomImage; public class ImageServlet extends HttpServlet { public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException { //禁止浏览器缓存数据 response.setHeader("expires","0"); response.setHeader("Cache-Control","no-cache"); response.setHeader("Pragma","no-cache"); //1.通知浏览器以图片的方式打开数据 response.setContentType("image/jpeg"); //把图片显示给浏览器 ImageIO.write(RandomImage.createImage(),"jpeg",response.getOutputStream()); } public void doPost(HttpServletRequest request,IOException { this.doGet(request,response); } } @H_403_23@
login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'login.jsp' starting page</title> <Meta http-equiv="pragma" content="no-cache"> <Meta http-equiv="cache-control" content="no-cache"> <Meta http-equiv="expires" content="0"> <Meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <Meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> <!-- 引入js文件 --> <script type="text/javascript" > //当窗体加载完毕后触发该函数 window.onload = function(){ //获取name输入框的Dom对象 var inputName = document.getElementById("uname"); //注册事件 inputName.onblur= checkName; }; function checkName(){ var name = this.value; //1.第一步获取XMLHttpRequest对象 var xmlHttp = getXMLHttp(); //2. 第二步：打开请求 xmlHttp.open("GET","./checkName.do?name="+name+"&oper=checkName"); //3.第三步：发送请求 xmlHttp.send(null);//checkName.do //4.第四步：函数处理 xmlHttp.onreadystatechange= processProgram; } function processProgram(){ //判断是否处理完成，响应的是否正常 //alert("11111111111111111111"); if(this.readyState==4&&this.status==200){ //服务器端响应过来的文本 var content = this.responseText; //alert("---"+content); //获取显示文本的span,Dom节点对象 var msgDom = document.getElementById("msg"); //清除操作 var childNodes = msgDom.childNodes; for(var i=0;i<childNodes.length;i++){ //删除所有的孩子节点 msgDom.removeChild(childNodes[i]); } //创建一个文本节点对象 var textDom =document.createTextNode(content); //在显示文本的span，Dom节点中添加textDom的孩子节点 msgDom.appendChild(textDom); } } function getXMLHttp() { // 第一步：声明返回值 var xmlHttp; // 第二步：实例化xmlHttp对象 try { // firefox Opera等 xmlHttp = new XMLHttpRequest(); } catch (e) { try { // IE浏览器 xmlHttp = new ActiveXObject("MSXML2.XMLHTTP5.0"); } catch (ex) { xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); } } return xmlHttp; } </script> </head> <body> <div align="center"> <form action="./login.action" method="post"> <table border="1px" cellpadding="0" cellspacing="0"> <tr> <td>用户名:</td> <td><input type="text" name="name" id="uname"/></td> <td><span id="msg"></span></td> </tr> <tr> <td>密码:</td> <td colspan="2"><input type="password" name="pass" /></td> </tr> <tr> <td>验证码:</td> <td><input type="text" name="code" /></td> <td><img alt="验证码" src="./servlet/ImageServlet"></td> </tr> <tr> <td colspan="3" align="center"><input type="reset" value="重置" /> <input type="submit" value="登录" /></td> </tr> </table> </form> </div> </body> </html>@H_403_23@ web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <display-name></display-name> <servlet> <servlet-name>AjaxServlet</servlet-name> <servlet-class>www.csdn.net.ajax.servlet.AjaxServlet</servlet-class> </servlet> <servlet> <servlet-name>ImageServlet</servlet-name> <servlet-class>www.csdn.net.ajax.servlet.ImageServlet</servlet-class> </servlet> <servlet> <servlet-name>AdminServlet</servlet-name> <servlet-class>www.csdn.net.ajax.servlet.AdminServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>AjaxServlet</servlet-name> <url-pattern>/ajaxServlet.do</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>AdminServlet</servlet-name> <url-pattern>/checkName.do</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>ImageServlet</servlet-name> <url-pattern>/servlet/ImageServlet</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app> @H_403_23@package www.csdn.net.ajax.servlet; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import www.csdn.net.user.dao.UserDo; import www.csdn.net.user.dao.impl.UserDoImpl; public class AdminServlet extends HttpServlet { private UserDo userDo=new UserDoImpl(); public void doGet(HttpServletRequest request,IOException { String oper = request.getParameter("oper"); if ("checkName".equals(oper)) // 验证用户操作 checkName(request,response); // System.out.println(oper); } public void checkName(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException { String name = request.getParameter("name"); boolean flag=false; try { flag=userDo.checkName(name); } catch (Exception e) { e.printStackTrace(); } //设置响应 response.setCharacterEncoding("UTF-8"); response.setContentType("text/html;charset=UTF-8"); PrintWriter out=response.getWriter(); if (flag) { out.write("用户名被占用"); }else{ out.write("用户名可用"); } //System.out.println("----------------------"); out.flush(); out.close(); } public void doPost(HttpServletRequest request,IOException { this.doGet(request,response); } } @H_403_23@
