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1. Servlet开发
1) servlet引入
2) servlet生命周期
3) 客户端跳转
4) 服务器跳转
5) jsp&servlet用户登录功能实现
6) servlet过滤器
7) servlet监听器
1) servlet引入
HelloWorldServlet.java package com.andrew.web; 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; public class HelloWorldServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("get"); this.doPost(request, response); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setCharacterEncoding("gbk"); PrintWriter out=response.getWriter(); out.println("<html>"); out.println("<head><title>问候</title></head>"); out.println("Servlet你好!"); out.println("</html>"); out.close(); } } web.xml <servlet> <servlet-name>helloWorldServlet</servlet-name> <servlet-class>com.andrew.web.HelloWorldServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>helloWorldServlet</servlet-name> <url-pattern>/helloWorld</url-pattern> </servlet-mapping> http://localhost:8080/HeadFirstJspServletChap05/helloWorld 运行结果: Servlet你好!
2) servlet生命周期
servlet的生命周期,简单的概括这就分为四步:servlet类加载--->实例化--->服务--->销毁。
LifeServlet.java package com.andrew.web; 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; public class LifeServlet extends HttpServlet { public void destroy() { System.out.println("LifeServlet destroy!"); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("LifeServlet doGet!"); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("LifeServlet doPost!"); } public void init() throws ServletException { System.out.println("LifeServlet init!"); } } web.xml <servlet> <servlet-name>LifeServlet</servlet-name> <servlet-class>com.andrew.web.LifeServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>LifeServlet</servlet-name> <url-pattern>/LifeServlet</url-pattern> </servlet-mapping> http://localhost:8080/HeadFirstJspServletChap05/LifeServlet 控制台: LifeServlet init! LifeServlet doGet!
3) 客户端跳转
response.sendRedirect("目标地址");
RedirectServlet.java package com.andrew.web; import java.io.IOException; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; public class RedirectServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setAttribute("requestKey", "request值"); HttpSession session=request.getSession(); session.setAttribute("sessionKey", "session值"); ServletContext application=this.getServletContext(); application.setAttribute("applicationKey", "application值"); // 客户端跳转/重定向 response.sendRedirect("target.jsp"); } } web.xml <servlet> <servlet-name>RedirectServlet</servlet-name> <servlet-class>com.andrew.web.RedirectServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>RedirectServlet</servlet-name> <url-pattern>/RedirectServlet</url-pattern> </servlet-mapping> target.jsp <h1>目标地址</h1> request值:<%=request.getAttribute("requestKey") %><br/> session值:<%=session.getAttribute("sessionKey") %><br/> application值:<%=application.getAttribute("applicationKey") %><br/> http://localhost:8080/HeadFirstJspServletChap05/target.jsp 运行结果: 目标地址 request值:null session值:session值 application值:application值
4) 服务器跳转
RequestDispatcher rd = request.getRequestDispatcher("目标地址"); rd.forward(request, response);
ForwardServlet.java package com.andrew.web; import java.io.IOException; import javax.servlet.RequestDispatcher; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; public class ForwardServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setAttribute("requestKey", "request值"); HttpSession session=request.getSession(); session.setAttribute("sessionKey", "session值"); ServletContext application=this.getServletContext(); application.setAttribute("applicationKey", "application值"); // 服务器调转/转发 RequestDispatcher rd=request.getRequestDispatcher("target.jsp"); rd.forward(request, response); } } web.xml <servlet> <servlet-name>ForwardServlet</servlet-name> <servlet-class>com.andrew.web.ForwardServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>ForwardServlet</servlet-name> <url-pattern>/ForwardServlet</url-pattern> </servlet-mapping> target.jsp <h1>目标地址</h1> request值:<%=request.getAttribute("requestKey") %><br/> session值:<%=session.getAttribute("sessionKey") %><br/> application值:<%=application.getAttribute("applicationKey") %><br/> http://localhost:8080/HeadFirstJspServletChap05/ForwardServlet 运行结果: 目标地址 request值:request值 session值:session值 application值:application值
5) jsp&servlet用户登录功能实现
6) servlet过滤器
7) servlet监听器
创建数据库db_jsp 创建表t_user CREATE TABLE t_user ( id int(11) NOT NULL AUTO_INCREMENT, userName varchar(20) DEFAULT NULL, password varchar(20) DEFAULT NULL, PRIMARY KEY (id) ) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8; insert into t_user(id,userName,password) values(1,'andrew','123456'); User.java package com.andrew.model; public class User { private int id; private String userName; private String password; public User() { super(); } public User(String userName, String password) { super(); this.userName = userName; this.password = password; } // getter and setter } DbUtil.java package com.andrew.util; import java.sql.Connection; import java.sql.DriverManager; public class DbUtil { private String dbUrl = "jdbc:mysql://localhost:3306/db_jsp"; private String dbUserName = "root"; private String dbPassword = "root"; private String jdbcName = "com.mysql.jdbc.Driver"; public Connection getCon() throws Exception { Class.forName(jdbcName); Connection con = DriverManager.getConnection(dbUrl, dbUserName, dbPassword); return con; } public void closeCon(Connection con) throws Exception { if (con != null) { con.close(); } } public static void main(String[] args) { DbUtil dbUtil = new DbUtil(); try { dbUtil.getCon(); System.out.println("连接成功"); } catch (Exception e) { e.printStackTrace(); } } } UserDao.java package com.andrew.dao; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import com.andrew.model.User; public class UserDao { public User login(Connection con,User user) throws Exception{ User resultUser=null; String sql="select * from t_user where userName=? and password=?"; PreparedStatement pstmt=con.prepareStatement(sql); pstmt.setString(1, user.getUserName()); pstmt.setString(2, user.getPassword()); ResultSet rs=pstmt.executeQuery(); if(rs.next()){ resultUser=new User(); resultUser.setUserName(rs.getString("userName")); resultUser.setPassword(rs.getString("password")); } return resultUser; } } LoginServlet.java package com.andrew.web; import java.io.IOException; import java.sql.Connection; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import com.andrew.dao.UserDao; import com.andrew.model.User; import com.andrew.util.DbUtil; public class LoginServlet extends HttpServlet { DbUtil dbUtil = new DbUtil(); UserDao userDao = new UserDao(); @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String userName=request.getParameter("userName"); String password=request.getParameter("password"); Connection con = null; try { User user = new User(userName,password); con = dbUtil.getCon(); User currentUser = userDao.login(con, user); if (currentUser == null) { request.setAttribute("error", "用户名或密码错误"); request.setAttribute("userName", userName); request.setAttribute("password", password); request.getRequestDispatcher("login.jsp").forward(request, response); } else { HttpSession session = request.getSession(); session.setAttribute("currentUser", currentUser); response.sendRedirect("main.jsp"); } } catch (Exception e) { e.printStackTrace(); } } } LogoutServlet.java package com.andrew.web; import java.io.IOException; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; public class RedirectServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setAttribute("requestKey", "request值"); HttpSession session=request.getSession(); session.setAttribute("sessionKey", "session值"); ServletContext application=this.getServletContext(); application.setAttribute("applicationKey", "application值"); // 客户端跳转/重定向 response.sendRedirect("target.jsp"); } } LoginFilter.java package com.andrew.filter; import java.io.IOException; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; public class LoginFilter implements Filter { public void destroy() {} public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest) servletRequest; HttpSession session = request.getSession(); Object o = session.getAttribute("currentUser"); String path = request.getServletPath(); if (o == null && path.indexOf("login") < 0) { request.getRequestDispatcher("login.jsp").forward(servletRequest, servletResponse); } else { filterChain.doFilter(servletRequest, servletResponse); } } public void init(FilterConfig arg0) throws ServletException {} } SessionAttributeListener.java package com.andrew.listener; import javax.servlet.http.HttpSessionAttributeListener; import javax.servlet.http.HttpSessionBindingEvent; public class SessionAttributeListener implements HttpSessionAttributeListener { public void attributeAdded(HttpSessionBindingEvent httpSessionBindingEvent) { System.out.println("添加的属性名:" + httpSessionBindingEvent.getName() + ",属性值:" + httpSessionBindingEvent.getValue()); } public void attributeRemoved(HttpSessionBindingEvent httpSessionBindingEvent) { System.out.println("删除的属性名:" + httpSessionBindingEvent.getName() + ",属性值:" + httpSessionBindingEvent.getValue()); } public void attributeReplaced( HttpSessionBindingEvent httpSessionBindingEvent) { } } web.xml <servlet> <servlet-name>LoginServlet</servlet-name> <servlet-class>com.andrew.web.LoginServlet</servlet-class> </servlet> <servlet> <servlet-name>LogoutServlet</servlet-name> <servlet-class>com.andrew.web.LogoutServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>LoginServlet</servlet-name> <url-pattern>/login</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>LogoutServlet</servlet-name> <url-pattern>/logout</url-pattern> </servlet-mapping> <filter> <filter-name>loginFilter</filter-name> <filter-class>com.andrew.filter.LoginFilter</filter-class> </filter> <filter-mapping> <filter-name>loginFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <listener> <listener-class> com.andrew.listener.SessionAttributeListener </listener-class> </listener> login.jsp <form action="login" method="post"> <table> <tr><th colspan="2">用户登录</th></tr> <tr><td>用户名:</td><td><input type="text" id="userName" name="userName" value="${userName }"/></td></tr> <tr><td>密码:</td><td><input type="password" id="password" name="password" value="${password }"/></td></tr> <tr><td><input type="submit" value="登录"/></td> <td><font color="red">${error }</font></td></tr> </table> </form> main.jsp 主页!当前登录用户:${currentUser.userName } <a href="logout">注销</a> http://localhost:8080/HeadFirstJspServletChap05/login.jsp andrew 123456 sbumit 运行结果: 主页!当前登录用户:andrew 注销 控制台: 添加的属性名:currentUser,属性值:com.andrew.model.User@4bdf7b12
发表评论
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jsp标准标签库
2019-01-09 00:02 4481. jsp标准标签库 1) JSTL引入(JSP Stan ... -
jsp自定义标签
2019-01-09 00:01 4191. jsp自定义标签 1) jsp自定义没有属性标签 ... -
el表达式
2019-01-09 00:01 5241. el表达式 1) EL表达式 ... -
javaBean组件
2019-01-09 00:01 4451. javaBean组件 0) 不使用Javabean组件 ... -
jsp四个作用域及九个内置对象
2019-01-08 09:06 4611. jsp四个作用域 在Jsp开发中,可以保存数据,J ... -
jsp基础语法
2019-01-08 09:06 3731. page指令 language:用来定义要使用的脚 ... -
jsp概述
2019-01-08 09:06 3591. jsp概述 jsp: java server pa ... -
Java web页面form提交重定向sendRedirect到web页面
2018-12-23 11:03 1094Java web实现jsp页面的form表单提交sendRed ... -
Java web页面form提交请求转发forward到web页面
2018-12-23 11:02 981Java web实现jsp页面的form表单提交forward ... -
Java web页面form调用servlet显示
2018-12-17 09:41 702Java web使用jsp页面的form表单调用servlet ... -
Java web地址栏url调用servlet显示
2018-12-17 09:41 724通过Http请求调用servlet直接显示 1. 创建一个类 ... -
Java web页面form提交到web页面
2018-12-17 09:40 709Java web实现jsp页面的form表单提交到jsp页面 ...
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