| ＜!-- Login Manager --＞ ＜JAVA TYPE="class"＞ public static boolean checkUserPermission(HttpSession mySession, HttpServletRequest request, HttpServletResponse response) { if (mySession.getValue("hasPermission") == null || !((Boolean) mySession.getValue ("hasPermission" )).booleanValue()) { String requestedUrl = HttpUtils.getRequestURL(request).toString(); String queryString = request.getQueryString(); if (queryString != null) { requestedUrl = requestedUrl "?" queryString; } requestedUrl = response.encodeUrl(requestedUrl); mySession.putValue("requestedUrl", requestedUrl); return false; } else { return true; } } ＜/JAVA＞ ＜% // JSP文件 String goodUser = "bill"; String goodPass = "bobo"; HttpSession mySession = request.getSession(true); String errorMessage = "Please Login To Access The Page You Requested"; boolean loginAttempt = false; String myMethod = request.getMethod(); if (request.getParameterValues("click") != null && request.getParameterValues ("click")[0].trim().equals("Log In")) { loginAttempt = true; } if (loginAttempt) { String username = request.getParameterValues("user")[0].trim(); String password = request.getParameterValues("pass")[0].trim(); //out.println("username = |" username "| & password = |" password "|＜BR＞"); if (goodUser.equals(username) && goodPass.equals(password)) { response.sendRedirect((String)mySession.getValue("requestedUrl")); mySession.putValue("hasPermission", new Boolean(true)); errorMessage = "Unable to redirect: " (String) mySession.getValue("requestedUrl"); } else { errorMessage = "You did not get the Username or Password right"; } } else { errorMessage = "Haven't tried logging in yet."; if (mySession.getValue("requestedUrl") == null) { mySession.putValue("requestedUrl", "/index.jsp"); } //out.println("set userReferrer to " mySession.getValue("redirectTo") "＜BR＞"); } %＞ ＜CENTER＞ ＜font color=red＞＜%=errorMessage%＞＜/font＞ ＜TABLE align=center＞ ＜FORM action="adminLogin2.jsp" method=post name="login"＞ ＜TR＞ ＜TD＞Username:＜/TD＞ ＜TD＞＜input type=text name=user value=""＞＜/TD＞ ＜/TR＞ ＜TR＞ ＜TD＞Password:＜/TD＞ ＜TD＞＜input type=password name=pass value=""＞＜/TD＞ ＜/TR＞ ＜TR＞ ＜TD colspan=2 align=center＞＜input type=submit name=click value="Log In"＞ ＜/TD＞ ＜/TR＞ ＜/FORM＞ ＜/TABLE＞ ＜/CENTER＞ Original URL: ＜%= (String)mySession.getValue("requestedUrl") %＞ ＜script language="Javascript"＞ // ＜!-- if (document.forms.login != null) document.forms.login.user.focus(); // --＞ ＜/script＞ |
5.11 checkbox在jsp中的使用方法
＜%@ page language="Java" contentType="text/html" %＞ ＜%@ page import="com.ora.jsp.util.*" %＞ ＜html＞ ＜body bgcolor="white"＞ ＜form action="checkbox.jsp"＞ ＜input type="checkbox" name="fruits" value="Apple"＞Apple＜br＞ ＜input type="checkbox" name="fruits" value="Banana"＞Banana＜br＞ ＜input type="checkbox" name="fruits" value="Orange"＞Orange＜br＞ ＜input type="submit" value="Enter"＞ ＜/form＞ ＜% String[] picked = request.getParameterValues("fruits"); if (picked != null && picked.length != 0) { %＞ You picked the following fruits: ＜form＞ ＜input type="checkbox" name="fruits" value="Apple" ＜%= ArraySupport.contains(picked, "Apple")?"checked" : "" %＞ ＞Apple＜br＞ ＜input type="checkbox" name="fruits" value="Banana" ＜%= ArraySupport.contains(picked,"Banana")?"checked":"" %＞ ＞Banana＜br＞ ＜input type="checkbox" name="fruits" value="Orange" ＜%= ArraySupport.contains(picked,"Orange")?"checked" : "" %＞ ＞Orange＜br＞ ＜/form＞ ＜% } %＞ ＜/body＞ ＜/html＞ |
5.12 request对象
·如何获得一个运行时刻的JSP/Servlet文件的绝对URL地址
| String url = request.getRequestURL(); if (request.getQueryString() != null) { url = '?' request.getQueryString(); } URL theURL = new URL ( request.getScheme() , request.getServerName() , request.getServerPort(),url); out.print(URL.toString()); |
·如何知道客户端通过哪个URL访问本页面
| String callingPage = request.getHeader("Referer"); Out.print(callingPage); |
·如果form中出现好几个submit按钮，JSP/Servlet如何判断哪个按钮进行了提交在form中可以这样定义：
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