@nalan90
2018-06-29T11:16:39.000000Z
字数 8190
阅读 533
JAVAEE开发
<%int[] value = {60, 70, 80};for (int i: value) {out.println(i);}%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head><title>out对象</title></head><body><%out.println("<h2>静夜思</h2>");out.println("床前明月光<br>");out.println("疑是地上霜<br>");out.flush();//out.clear(); //会抛出异常out.println("举名望明月<br>");out.println("低头思故乡<br>");%>buffer size: <%=out.getBufferSize()%> bytes<br>remain buffer size: <%=out.getRemaining()%> bytes<br>auto clear buffer: <%=out.isAutoFlush()%><br></body></html>
## reg.jsp<%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head><title>注册</title></head><body><h1>用户登录</h1><hr><form action="request.jsp" name="loginForm" method="post">用户名: <input type="text" name="username"><br>爱好: <input type="checkbox" name="fav" value="read">读书 <input type="checkbox" name="fav" value="music">音乐 <input type="checkbox" name="fav" value="movie">电影 <input type="checkbox" name="fav" value="swimming">游泳<br><input type="submit" value="login"></form><br><br><a href="request.jsp?username=张爽">测试URL传参</a></body></html>##request.jsp<%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head><title>注册主页</title></head><body><h1>request内置对象</h1><%//解决中文乱码问题,无法解决url传递的中文乱码request.setCharacterEncoding("utf-8");request.setAttribute("password", "123456");%>用户名: <%=request.getParameter("username")%><br>爱好:<%if (request.getParameterValues("fav") != null) {String[] favs = request.getParameterValues("fav");for (String fav: favs) {out.println(fav+" ");}}%><br><%=request.getContextPath()%><br><%=request.getPathInfo()%><br><%=request.getServletPath()%><br><%=request.getContentType()%><br><%=request.getPathInfo()%><br><%=request.getProtocol()%><br><%=request.getServerName()%><br><%=request.getServerPort()%><br><%=request.getRemoteAddr()%><br><%=request.getAttribute("password")%></body></html>
注意：解决URL传递中文乱码问题如下:
1、编辑tomcat conf/server.xml文件，添加 URIEncoding="utf-8"<Connector port="8080" protocol="HTTP/1.1"connectionTimeout="20000"redirectPort="8443" URIEncoding="utf-8"/>2、重启tomcat
常用方法
请求转发与请求重定向
示例
<%@ page contentType="text/html;charset=UTF-8" import="java.io.*" language="java" %><%response.setContentType("text/html;charset=utf-8");out.println("<h1>response内置对象</h1>");out.println("<hr>");//out.flush();PrintWriter pw = response.getWriter();pw.println("大家好，我是response对象生成的输出流out对象");//response.sendRedirect("reg.jsp");//response.sendRedirect("request.jsp"); //请求重定向request.getRequestDispatcher("request.jsp").forward(request, response); //请求转发%>
什么是session
session的生命周期
常用方法
session设置超时
<session-config><session-timeout>1</session-timeout></session-config>
示例
##session.pageone.jsp<%@ page contentType="text/html;charset=UTF-8" language="java" %><%@ page import="java.text.SimpleDateFormat" %><%@ page import="java.util.Date" %><html><head><title>session.pageone.jsp</title></head><body><h1>session对象</h1><%SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");Date d = new Date(session.getCreationTime());session.setAttribute("username", "zhangshuang");session.setAttribute("password", "123456");session.setAttribute("age", "28");//session.setMaxInactiveInterval(10);%>session创建时间: <%=sdf.format(d)%><br>session的ID编号: <%=session.getId()%><br>session中获取用户名: <%=session.getAttribute("username")%><br><%//session.invalidate(); //销毁session%><a href="session.pagetwo.jsp" type="_blank">跳转到session.pagetwo.jsp</a></body></html>##session.pagetwo.jsp<%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head><title>session.pagetwo.jsp</title></head><body>session的ID编号: <%=session.getId()%><br>session中获取用户名: <%=session.getAttribute("username")%><br></body></html>
<%@ page import="java.util.Enumeration" %><%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head><title>application对象</title></head><body><%application.setAttribute("city", "北京");application.setAttribute("postcode", "100000");application.setAttribute("email","admin@admin.com");%>城市：<%=application.getAttribute("city")%><br>application所有属性名称：<%Enumeration attributes = application.getAttributeNames();while (attributes.hasMoreElements()) {out.println(attributes.nextElement()+"<br>");}%><br>JSP引擎信息<%=application.getServerInfo()%></body></html>
## login.jsp<%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head><title>登录页面</title></head><body><h1>用户登录</h1><hr><form action="dologin.jsp" name="loginForm" method="post">用户名: <input type="text" name="username"><br>密码：<input type="password" name="password"><br><input type="submit" value="login"></form></body></html>## dologin.jsp<%@ page contentType="text/html;charset=UTF-8" language="java" %><%request.setCharacterEncoding("utf-8");String username = "";String password = "";username = request.getParameter("username");password = request.getParameter("password");if ("admin".equals(username) && "admin".equals(password)) {session.setAttribute("loginUser", username);request.getRequestDispatcher("login_success.jsp").forward(request, response);} else {response.sendRedirect("login_fail.jsp");}%>##login_success.jsp<%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head><title>登录成功</title></head><body><%String loginUser = "";if (session.getAttribute("loginUser") != null) {loginUser = session.getAttribute("loginUser").toString();}%>欢迎您<%=loginUser%></body></html>##login_fail.jsp<%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head><title>登录失败</title></head><body><h3>登录失败</h3><a href="login.jsp">重新登录</a></body></html>