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设计模式惭痴颁
- 8. 原始时代(JSP or Servlet) Password.htm<HTML><BODY><form action="PasswordGen.jsp" method="POST"><H3>Welcome to the Password Generator</H3>First Name: <input type="text" name="firstName"><br>Last Name: <input type="text" name="lastName"><br><p><input type="submit" value="Generate Password"></form></BODY></HTML>
- 10. 原始时代(JSP or Servlet)PasswordGen.jsp<html><body><% String firstName = request.getParameter("firstName"); String lastName = request. getParameter("lastName"); String password;if( (firstName.length()>=2) && (lastName.length()>=2)) password = lastName.substring(0,2)+firstName.substring(0,2); else password = "NoGo";%><h1>Password Generated!</h1>Your super secret password is <%= password %>.<br><a href="Password.htm">To generate another password.</a></body></html>
- 11. 原始时代(JSP or Servlet)PasswordGen.jsp<html><body><% String firstName = request.getParameter("firstName"); String lastName = request. getParameter("lastName"); String password;if( (firstName.length()>=2) && (lastName.length()>=2)) password = lastName.substring(0,2)+firstName.substring(0,2); else password = "NoGo";%><h1>Password Generated!</h1>Your super secret password is <%= password %>.<br><a href="Password.htm">To generate another password.</a></body></html>看着都费劲，别说修改了╮(╯_╰)╭
- 13. MVC
- 16. Servlet and JSP
- 17. Servlet and JSP Password.htm<HTML><BODY><form action="/webapp/passwordservlet" method="POST"><H3>Welcome to the Password Generator</H3>First Name: <input type="text" name="firstName"><br>Last Name: <input type="text" name="lastName"><br><p><input type="submit" value="Generate Password"></form></BODY></HTML>
- 18. Servlet and JSP passwordServlet.javapublic void doPost(HttpServletRequest request, HttpServletResponse response) throws Exception {GenBeangb = new GenBean();gb.setFirstName(request.getParameter("firstName"));gb.setLastName(request.getParameter("lastName"));gb.generate();request.setAttribute("gen", gb);RequestDispatcherrd = getServletContext().getRequestDispatcher("/PasswordGen.jsp");rd.forward(request, response); }
- 19. Servlet and JSP GenBean.java public class GenBean { private String firstName; private String lastName; private String password = "NoGo"; public String getFirstName(){ return firstName; } public void setFirstName(String fn){ firstName = fn;} public String getLastName(){ return lastName; } public void setLastName(String ln){ lastName = ln; } public String getPassword(){return password;} public String generate() { if( (firstName.length() >= 2) && (lastName.length() >= 2)) password = lastName.substring(0,2) + firstName.substring(0,2); return password; }}
- 20. Servlet and JSPPasswordGen.jsp<html><body><jsp:useBean id = "gen" class = “genpackage.GenBean" scope="request"/><h1>Password Generated!</h1>Your super secret password is <jsp:getProperty name="gen" property="password"/><br><a href="Password.htm">To generate another password.</a></body></html> 清晰了很多吧o(≧v≦)o~~
- 21. 体现分发的Servlet控制器 verify.java public void doPost(HttpServletRequest request, HttpServletResponse response) throws Exception { String username = request.getParameter(“username")); String password = request.getParameter(“password")); boolean valid = new Security().verify(username, password);RequestDispatcherrd= null; if(valid) {rd= getServletContext().getRequestDispatcher("/valid.jsp"); } else {rd= getServletContext().getRequestDispatcher("/invalid.jsp"); }rd.forward(request, response); }
- 22. 现在呈现和逻辑被分开了，真好呀Servlet 1JSP 1Servlet 2JSP 2Servlet 3JSP 3有没有改进的余地？
- 23. 如果把Servlet组合起来？ControllerJSP 1Model 1JSP 2Model 2JSP 3Model 3关系是不是简单了许多？
- 24. Struts 2
- 25. ModelAction 1Action 2Action 3BeanDAOServiceStruts 2XML配置ControllerStruts 2Dispatcher浏览器Web容器ViewJSP 1JSP 2DataBase
- 26. web.xml <filter> ????????<filter-name>struts2</filter-name> ????????<filter-class> ????????????org.apache.struts2.dispatcher.FilterDispatcher ????????</filter-class> ????</filter> ????<filter-mapping> ????????<filter-name>struts2</filter-name> ????????<url-pattern>/*</url-pattern> ????</filter-mapping>
- 27. Struts.xml<struts> <package name=“default” extends=“struts-default”> <action name=“hello” class=“HelloWorld”> <result name=“SUCCESS”>/HelloWorld.jsp </result> </action> </package></struts>
- 28. HelloWorld.java(POJO)public class HelloWorld { private String message; public String execute() Exception { message = “Hello,world\n”; message += “The time is:\n”; message += System.currentTimeMillis(); return “SUCCESS”; } public void setMessage(String message){this.message = message; } public String getMessage() { return message; }}
- 29. HelloWorld.jsp<%@ taglib prefix="s" uri="/struts-tags" %><html><head><title>Hello World!</title></head><body><h2><s:property value="message" /></h2></body></html>
- 31. 谢谢！