【环境】
eclipse j2ee;
Tomcat 7.0;

【模型1】

  1. package com.zhiqi;
  2.  
  3. import ...;
  4.  
  5. public class TestServlet extends HttpServlet {
  6. 	private static final long serialVersionUID = 1L;
  7. 	public void doGet(HttpServletRequest 
  8.  
  9. req,HttpServletResponse resp) throws 
  10.  
  11. ServletException,IOException{
  12. 		resp.setContentType
  13.  
  14. ("text/html;charset=utf-8");
  15. 		PrintWriter out=resp.getWriter();
  16. 		out.println("<html>");
  17. 		out.println("<head><title>test 
  18.  
  19. Servlet</title></head>");
  20. 		out.println("<body>");
  21. 		out.println("欢迎使用Servlet编程");
  22. 		out.println("</body>");
  23. 		out.println("</html>");
  24. 		out.flush();
  25. 		out.close();
  26. 	}
  27. }

　　

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <web-app>
  3. 	<servlet>
  4. 		<servlet-name>TestServlet</servlet-name>
  5. 		<servlet-
  6.  
  7. class>com.zhiqi.TestServlet</servlet-class>
  8. 	</servlet>
  9.  
  10. 	<servlet-mapping>
  11. 		<servlet-name>TestServlet</servlet-name>
  12. 		<url-pattern>/fun</url-pattern>
  13. 	</servlet-mapping>
  14. </web-app>

　　【模型2】getInitParameter("repeat")

  1. package com.zhiqi;
  2.  
  3. import ...;
  4.  
  5. public class SecondServlet extends HttpServlet {
  6. 	private static final long serialVersionUID = 1L;
  7.  
  8. 	public void doGet(HttpServletRequest 
  9.  
  10. req,HttpServletResponse resp) throws 
  11.  
  12. ServletException,IOException{
  13. 		int repeat=Integer.parseInt
  14.  
  15. (getInitParameter("repeat"));
  16. 		resp.setContentType
  17.  
  18. ("text/html;charset=utf-8");
  19. 		PrintWriter out=resp.getWriter();
  20. 		out.println("<html>");
  21. 		out.println("<head><title>test2 
  22.  
  23. Servlet</title></head>");
  24. 		out.println("<body>");
  25.  
  26. 		for(int i=0;i<repeat;i++){
  27. 			out.println("<table border=
  28.  
  29. \"1\"><tr>");
  30. 			out.println("<td>"+(i
  31.  
  32. +1)+"</td><td>");
  33. 			out.println("欢迎使用Servlet");
  34. 			out.println
  35.  
  36. ("</td></tr></table>");
  37. 			out.println("<br>");
  38. 		}
  39. 		out.println("</body>");
  40. 		out.println("</html>");
  41. 		out.flush();
  42. 		out.close();
  43. 	}
  44. }

　　

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <web-app>
  3. 	<servlet>
  4. 		<servlet-name>SecondServlet</servlet-
  5.  
  6. name>
  7. 		<servlet-
  8.  
  9. class>com.zhiqi.SecondServlet</servlet-class>
  10.  
  11. 		<init-param>
  12. 			<param-name>repeat</param-name>
  13. 			<param-value>5</param-value>
  14. 		</init-param>
  15. 	</servlet>
  16.  
  17. 	<servlet-mapping>
  18. 		<servlet-name>SecondServlet</servlet-
  19.  
  20. name>
  21. 		<url-pattern>/second</url-pattern>
  22. 	</servlet-mapping>
  23. </web-app>

　　

　　【模型3】获取服务器的运行参数

　　

  1. package com.zhiqi;
  2.  
  3. import java.io.IOException;
  4. import java.io.PrintWriter;
  5.  
  6. import javax.servlet.ServletException;
  7. import javax.servlet.http.HttpServlet;
  8. import javax.servlet.http.HttpServletRequest;
  9. import javax.servlet.http.HttpServletResponse;
  10.  
  11. public class ThirdServlet extends HttpServlet {
  12. 	private static final long serialVersionUID = 1L;
  13.  
  14. 	public void doGet(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException{
  15. 		doPost(req,resp);
  16. 	}
  17.  
  18. 	public void doPost(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException{
  19. 		resp.setContentType("text/html;charset=utf-8");
  20. 		PrintWriter out=resp.getWriter();
  21. 		out.println("<html>");
  22. 		out.println("<head><title>test3 Servlet</title></head>");
  23. 		out.println("<body>");
  24. 		fun(req,out);
  25. 		out.println("</body>");
  26. 		out.println("</html>");
  27. 		out.flush();
  28. 		out.close();
  29. 	}
  30. 	public void fun(HttpServletRequest req,PrintWriter out)  throws IOException{
  31. 		out.println("<ul>");
  32. 		out.println("<li>服务器IP->"+req.getRemoteAddr()+"</li>");
  33. 		out.println("<li>服务器名->"+req.getServerName()+"</li>");
  34. 		out.println("<li>服务器端口->"+req.getServerPort()+"</li>");
  35. 		out.println("<li>协议名->"+req.getScheme()+"</li>");
  36. 		out.println("<li>协议版本->"+req.getProtocol()+"</li>");
  37. 		out.println("<li>请求的方法->"+req.getMethod()+"</li>");
  38. 		out.println("<li>请求的URL->"+req.getRequestURL()+"</li>");
  39. 		out.println("<li>上下文路径->"+req.getContextPath()+"</li>");
  40. 		out.println("<li>Servlet路径->"+req.getServletPath()+"</li>");
  41.  
  42. 		out.println("</ul>");
  43. 	}
  44. }

　　

  1. <?xml version="1.0" encoding="UTF-8"?>
  2.  
  3. <web-app>
  4. 	<servlet>
  5. 		<servlet-name>ThirdServlet</servlet-name>
  6. 		<servlet-class>com.zhiqi.ThirdServlet</servlet-class>
  7.  
  8. 	</servlet>
  9.  
  10. 	<servlet-mapping>
  11. 		<servlet-name>ThirdServlet</servlet-name>
  12. 		<url-pattern>/third</url-pattern>
  13. 	</servlet-mapping>
  14. </web-app>

　　

【模型4】获得头信息

  1. package com.zhiqi;
  2.  
  3. import ...
  4.  
  5. public class FourthServlet extends HttpServlet {
  6. 	private static final long serialVersionUID = 1L;
  7.  
  8. 	public void doGet(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException{
  9. 		fun(req,resp);
  10. 	}
  11. 	public void doPost(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException{
  12. 		fun(req,resp);
  13. 	}
  14. 	public void fun(HttpServletRequest req,HttpServletResponse resp)throws ServletException,IOException{
  15. 		String headers=null;
  16. 		Enumeration e=req.getHeaderNames();
  17. 		resp.setContentType("text/html;charset=utf-8");
  18. 		PrintWriter out=resp.getWriter();
  19. 		out.println("<html>");
  20. 		out.println("<head><title>test4 Servlet</title></head>");
  21. 		out.println("<body>");
  22. 		out.println("<ul>");
  23.  
  24. 		while(e.hasMoreElements()){
  25. 			headers=(String) e.nextElement();
  26. 			if(headers!=null){
  27. 				out.println("<li>"+headers+" -> "+req.getHeader(headers)+"</li>");
  28. 				//out.println("->");
  29. 				//out.println("<li>"+req.getHeader(headers)+"</li>");
  30. 			}
  31. 		}
  32. 		//out.println("<li>"+"</li>");
  33. 		out.println("</ul>");
  34. 		out.println("</body>");
  35. 		out.println("</html>");
  36. 		out.flush();
  37. 		out.close();
  38. 	}
  39. }

　　

  1. <?xml version="1.0" encoding="UTF-8"?>
  2.  
  3. <web-app>
  4. 	<servlet>
  5. 		<servlet-name>FourthServlet</servlet-name>
  6. 		<servlet-class>com.zhiqi.FourthServlet</servlet-class>
  7.  
  8. 	</servlet>
  9.  
  10. 	<servlet-mapping>
  11. 		<servlet-name>FourthServlet</servlet-name>
  12. 		<url-pattern>/fourth</url-pattern>
  13. 	</servlet-mapping>
  14. </web-app>

　

　【模型5】Servlet处理表单

  1. package com.zhiqi;
  2.  
  3. import java.io.IOException;
  4. import java.io.PrintWriter;
  5.  
  6. import javax.servlet.ServletException;
  7. import javax.servlet.http.HttpServlet;
  8. import javax.servlet.http.HttpServletRequest;
  9. import javax.servlet.http.HttpServletResponse;
  10.  
  11. public class LoginServlet extends HttpServlet {
  12. 	private static final long serialVersionUID = 1L;
  13.  
  14. 	public void doGet(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException{
  15. 		resp.setContentType("text/html;charset=utf-8");
  16. 		PrintWriter out=resp.getWriter();
  17. 		out.println("<html>");
  18. 		out.println("<head><title>login</title></head>");
  19. 		out.println("<body>");
  20. 		out.println("<h2>请输入登录信息</h2>");
  21. 		out.println("<form method='post' action='"+req.getContextPath()//上下文路径
  22. 				+"/f'"
  23. 				+"'>");
  24. 		out.println("<div>用户名：</div>");
  25. 		out.println("<div><input type='text' name='userName' id='userName' /></div>");
  26.  
  27. 		out.println("<div>密码：</div>");
  28. 		out.println("<div><input type='password' name='password' id='password' /></div>");
  29.  
  30. 		out.println("<div><input type='submit' value='提交' /></div></form>");
  31.  
  32. 		out.println("</body>");
  33. 		out.println("</html>");
  34. 		out.flush();
  35. 		out.close();
  36. 	}
  37. 	public void doPost(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException{
  38. 		resp.setContentType("text/html;charset=utf-8");
  39. 		PrintWriter out=resp.getWriter();
  40. 		req.setCharacterEncoding("utf-8");//解决提交的表单数据中文乱码
  41. 		out.println("<html>");
  42. 		out.println("<head><title>login info</title></head>");
  43. 		out.println("<body>");
  44. 		String userName=req.getParameter("userName");
  45. 		String password=req.getParameter("password");
  46. 		if(userName==null || userName.length()==0 || password==null || password.length()==0){
  47. 			out.println("<h2>输入用户名和密码</h2>");
  48. 			out.println("<br><a href='"
  49. 			+req.getContextPath()+"/f'"
  50. 			+">登录</a>");
  51. 		}else{
  52. 			out.println("<h2>用户信息</h2>");
  53. 			out.println(userName);
  54. 			out.println(password);
  55. 		}
  56. 		out.println("</body>");
  57. 		out.println("</html>");
  58. 		out.flush();
  59. 		out.close();
  60.  
  61. 	}
  62. }

　　

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <web-app>
  3.  
  4. 	<servlet>
  5. 		<servlet-name>LoginServlet</servlet-name>
  6. 		<servlet-class>com.zhiqi.LoginServlet</servlet-class>
  7. 	</servlet>
  8. 	<servlet-mapping>
  9. 		<servlet-name>LoginServlet</servlet-name>
  10. 		<url-pattern>/f</url-pattern>
  11. 	</servlet-mapping>
  12.  
  13. </web-app>

　　

　　

通过Servlet处理表单是非常麻烦的，1、需要调用out对象输出。2、双引号的转义

所以需要对此进行改造

模型【6】处理HTML页面的表单

  1. <!DOCTYPE html>
  2. <html>
  3. <head>
  4. <meta charset="UTF-8">
  5. <title>login page</title>
  6. </head>
  7. <body>
  8. <h3>请输入用户名和密码</h3>
  9. <div>
  10. <form method="post" action="/LoginServlet2/f"><!-- 上下文路径+url-pattern -->
  11. 用户名：<input type="text" name="userName" ><br><br>
  12. 密码：<input type="password" name="password" ><br><br>
  13. <input type="submit" value="登录">
  14. </form>
  15. </div>
  16.  
  17. </body>
  18. </html>

　　

  1. package com.zhiqi;
  2.  
  3. import java.io.IOException;
  4. import java.io.PrintWriter;
  5.  
  6. import javax.servlet.ServletException;
  7. import javax.servlet.http.HttpServlet;
  8. import javax.servlet.http.HttpServletRequest;
  9. import javax.servlet.http.HttpServletResponse;
  10.  
  11. public class LoginServlet2 extends HttpServlet {
  12. 	private static final long serialVersionUID = 1L;
  13.  
  14. 	public void doGet(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException{
  15. 		resp.setContentType("text/html;charset=utf-8");
  16. 		PrintWriter out=resp.getWriter();
  17. 		out.println("<html>");
  18. 		out.println("<head><title>login</title></head>");
  19. 		out.println("<body>");
  20. 		out.println("<h2>请输入登录信息</h2>");
  21. 		out.println("<form method='post' action='"+req.getContextPath()//上下文路径
  22. 				+"/f'"
  23. 				+"'>");
  24. 		out.println("<div>用户名：</div>");
  25. 		out.println("<div><input type='text' name='userName' id='userName' /></div>");
  26.  
  27. 		out.println("<div>密码：</div>");
  28. 		out.println("<div><input type='password' name='password' id='password' /></div>");
  29.  
  30. 		out.println("<div><input type='submit' value='提交' /></div></form>");
  31.  
  32. 		out.println("</body>");
  33. 		out.println("</html>");
  34. 		out.flush();
  35. 		out.close();
  36. 	}
  37. 	public void doPost(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException{
  38. 		resp.setContentType("text/html;charset=utf-8");
  39. 		PrintWriter out=resp.getWriter();
  40. 		req.setCharacterEncoding("utf-8");//解决提交的表单数据中文乱码
  41. 		out.println("<html>");
  42. 		out.println("<head><title>login info</title></head>");
  43. 		out.println("<body>");
  44. 		String userName=req.getParameter("userName");
  45. 		String password=req.getParameter("password");
  46. 		if(userName==null || userName.length()==0 || password==null || password.length()==0){
  47. 			out.println("<h2>输入用户名和密码</h2>");
  48. 			out.println("<br><a href='"
  49. 			+req.getContextPath()+"/f'"
  50. 			+">登录</a>");
  51. 		}else{
  52. 			out.println("<h2>用户信息</h2>");
  53. 			out.println(userName);
  54. 			out.println(password);
  55. 		}
  56. 		out.println("</body>");
  57. 		out.println("</html>");
  58. 		out.flush();
  59. 		out.close();
  60.  
  61. 	}
  62. }

　　

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <web-app>
  3.  
  4. 	<servlet>
  5. 		<servlet-name>LoginServlet2</servlet-name>
  6. 		<servlet-class>com.zhiqi.LoginServlet2</servlet-class>
  7. 	</servlet>
  8. 	<servlet-mapping>
  9. 		<servlet-name>LoginServlet2</servlet-name>
  10. 		<url-pattern>/f</url-pattern>
  11. 	</servlet-mapping>
  12.  
  13. </web-app>

　　

【模型7】实例-网络调查表

　　

  1. <!DOCTYPE html>
  2. <html>
  3. <head>
  4. <meta charset="UTF-8">
  5. <title>网络调查表</title>
  6. </head>
  7. <body>
  8. <h2>潜在用户调查</h2>
  9. <div>
  10. <form method="post" action="/Example1/f">
  11. <div>
  12. 	<div style="float:left;margin-left:50px;">姓名：</div>
  13. 	<div style="float:left;margin-left:20px;"><input type="text" name="name"></div>
  14. </div>
  15. <div style="clear:both;">
  16. 	<div style="float:left;margin-left:50px;margin-top:5px;">Email：</div>
  17. 	<div style="float:left;margin-left:20px;margin-top:5px;"><input type="text" name="email"></div>
  18. </div>
  19. <div style="clear:both;">
  20. 	<div style="float:left;margin-left:50px;margin-top:5px;">年龄：</div>
  21. 	<div style="float:left;margin-left:20px;margin-top:5px;">
  22. 		<input type="radio" name="age" value="小于18">小于18
  23. 		<input type="radio" name="age" value="18-25">18-25
  24. 		<input type="radio" name="age" value="26-40">26-40
  25. 		<input type="radio" name="age" value="大于40">大于40
  26. 	</div>
  27. </div>
  28. <div style="clear:both;">
  29. 	<div style="float:left;margin-left:50px;margin-top:5px;">编程时间：</div>
  30. 	<div style="float:left;margin-left:50px;margin-top:5px;">
  31. 		<select name="seltime">
  32. 			<option value="1-2年">1-2年</option>
  33. 			<option value="2-5年">2-5年</option>
  34. 			<option value="5-10年">5-10年</option>
  35. 		</select>
  36. 	</div>
  37. </div>
  38. <div style="clear:both;">
  39. 	<div style="float:left;margin-left:50px;margin-top:5px;">使用操作系统：</div>
  40. 	<div style="float:left;margin-left:20px;margin-top:5px;">
  41. 		<select name="selos">
  42. 			<option value="Win XP">Win XP</option>
  43. 			<option value="Linux">Linux</option>
  44. 			<option value="Mac OS">Mac OS</option>
  45. 		</select>
  46. 	</div>
  47. </div>
  48. <div style="clear:both;">
  49. 	<div style="float:left;margin-left:50px;margin-top:5px;">使用编程语言：</div>
  50. 	<div style="float:left;margin-left:20px;margin-top:5px;">
  51. 		<input type="checkbox" name="lan" value="C">C
  52. 		<input type="checkbox" name="lan" value="C++">C++
  53. 		<input type="checkbox" name="lan" value="JAVA">JAVA
  54. 		<input type="checkbox" name="lan" value="C#">C#
  55. 		<input type="checkbox" name="lan" value="Python">Python
  56. 	</div>
  57. </div>
  58. <div style="clear:both;">
  59. 	<div style="float:left;margin-left:50px;margin-top:5px;">建议：</div>
  60. 	<div style="float:left;margin-left:20px;margin-top:5px;">
  61. 		<textarea name="ta"></textarea>
  62. 	</div>
  63. </div>
  64. <div style="clear:both;">
  65. 	<div style="float:left;margin-left:50px;margin-top:5px;"></div>
  66. 	<div style="float:left;margin-left:20px;margin-top:5px;">
  67. 		<input type="reset" name="" value="重置">
  68. 		<input type="submit" name="" value="提交">
  69. 	</div>
  70. </div>
  71.  
  72. </form>
  73. </div>
  74. </body>
  75. </html>

　　

  1. package com.zhiqi;
  2.  
  3. import java.io.IOException;
  4. import java.io.PrintWriter;
  5.  
  6. import javax.servlet.http.HttpServlet;
  7. import javax.servlet.http.HttpServletRequest;
  8. import javax.servlet.http.HttpServletResponse;
  9.  
  10. public class Example1 extends HttpServlet {
  11. 	private static final long serialVersionUID = 1L;
  12.  
  13. 	public void doGet(HttpServletRequest req,HttpServletResponse resp) throws IOException{
  14. 		doPost(req,resp);
  15. 	}
  16. 	public void doPost(HttpServletRequest req,HttpServletResponse resp) throws IOException{
  17. 		resp.setContentType("text/html;charset=utf-8");
  18. 		PrintWriter out=resp.getWriter();
  19. 		req.setCharacterEncoding("utf-8");
  20. 		out.println("<html>");
  21. 		out.println("<head><title>网络调查</title></head>");
  22. 		out.println("<body>");
  23.  
  24. 		out.println("<h3>用户出入了以下信息</h3>");
  25.  
  26. 		String name=req.getParameter("name");
  27. 		out.println("<p>用户姓名："+name+"</p>");
  28. 		String email=req.getParameter("email");
  29. 		out.println("<p>用户邮箱："+email+"</p>");
  30. 		String age=req.getParameter("age");
  31. 		out.println("<p>用户年龄："+age+"</p>");
  32. 		String seltime=req.getParameter("seltime");
  33. 		out.println("<p>编程时间："+seltime+"</p>");
  34. 		String selos=req.getParameter("selos");
  35. 		out.println("<p>使用平台："+selos+"</p>");
  36.  
  37. 		String [] lan=req.getParameterValues("lan");//获取数组
  38. 		out.println("<p>使用编程语言</p><ul>");
  39. 		for(int i=0;i<lan.length;i++){
  40. 			out.println("<li>"+lan[i]+"</li>");
  41. 		}
  42. 		out.println("</ul>");
  43.  
  44. 		String ta=req.getParameter("ta");
  45. 		out.println("<p>建议："+ta+"</p>");
  46. 		out.println("</body>");
  47. 		out.println("</html>");
  48. 	}
  49. }

　　

  1. <?xml version="1.0" encoding="UTF-8"?>
  2.  
  3. <web-app>
  4.  
  5. 	<servlet>
  6. 		<servlet-name>Example1</servlet-name>
  7. 		<servlet-class>com.zhiqi.Example1</servlet-class>
  8. 	</servlet>
  9. 	<servlet-mapping>
  10. 		<servlet-name>Example1</servlet-name>
  11. 		<url-pattern>/f</url-pattern>
  12. 	</servlet-mapping>
  13.  
  14. </web-app>

　　运行

【模型8】枚举类型获取参数以及参数值

  1. <!DOCTYPE html>
  2. <html>
  3. <head>
  4. <meta charset="UTF-8">
  5. <title>满意度调查</title>
  6. </head>
  7. <body>
  8. <h3>枚举类型获取参数以及参数值</h3>
  9. <h3>你对本网站提供的内容满意吗？</h3>
  10.  
  11. <form method="post" action="/Example2/f">
  12. <input type="hidden" name="reach_reco" value="满意度调查">
  13. <input type="submit" name="subm_cho" value="满意">
  14. <input type="submit" name="subm_cho" value="不满意">
  15. </form>
  16.  
  17. </body>
  18. </html>

　　

  1. package com.zhiqi;
  2.  
  3. import java.io.IOException;
  4. import java.io.PrintWriter;
  5. import java.util.Enumeration;
  6.  
  7. import javax.servlet.http.HttpServlet;
  8. import javax.servlet.http.HttpServletRequest;
  9. import javax.servlet.http.HttpServletResponse;
  10.  
  11. public class Example2 extends HttpServlet {
  12.  
  13. 	private static final long serialVersionUID = 1L;
  14.  
  15. 	public void doGet(HttpServletRequest req,HttpServletResponse resp) throws IOException{
  16. 		doPost(req,resp);
  17. 	}
  18. 	public void doPost(HttpServletRequest req,HttpServletResponse resp) throws IOException{
  19. 		resp.setContentType("text/html;charset=utf-8");
  20. 		PrintWriter out=resp.getWriter();
  21. 		req.setCharacterEncoding("utf-8");
  22. 		out.println("<html>");
  23. 		out.println("<head><title>网络调查</title></head>");
  24. 		out.println("<body>");
  25. 		out.println("<h3>信息如下</h3>");
  26.  
  27. 		//获取枚举类型,可在不知道参数名的情况下输出
  28. 		Enumeration e=req.getParameterNames();
  29. 		while(e.hasMoreElements()){
  30. 			String str=(String) e.nextElement();
  31. 			out.println("<p>"+str+"</p>");
  32.  
  33. 			String [] s=req.getParameterValues(str);
  34. 			for(int i=0;i<s.length;i++){
  35. 				out.println("<p>"+s[i]+"</p>");
  36. 			}
  37. 		}
  38.  
  39. 		out.println("</body>");
  40. 		out.println("</html>");
  41. 	}
  42. }

　　

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <web-app>
  3.  
  4.     <servlet>
  5.         <servlet-name>Example2</servlet-name>
  6.         <servlet-class>com.zhiqi.Example2</servlet-class>
  7.     </servlet>
  8.     <servlet-mapping>
  9.         <servlet-name>Example2</servlet-name>
  10.         <url-pattern>/f</url-pattern>
  11.     </servlet-mapping>
  12.  
  13. </web-app>

　　

　　

【模型9】Cookie的使用

  1. <!DOCTYPE html>
  2. <html>
  3. <head>
  4. <meta charset="UTF-8">
  5. <title>Test Cookie</title>
  6. </head>
  7. <body>
  8.  
  9. <h3>Test Cookie</h3>
  10. <form method="post" action="/Example8/set">
  11. 用户名：<input type="text" name="userName" id="userName" />
  12. <br><br>
  13. <input type="submit" value="登录" />
  14. <input type="reset" value="重置" />
  15. </form>
  16. </body>
  17. </html>

　　

  1. package com.zhiqi;
  2.  
  3. import java.io.IOException;
  4. import java.io.PrintWriter;
  5.  
  6. import javax.servlet.http.Cookie;
  7. import javax.servlet.http.HttpServlet;
  8. import javax.servlet.http.HttpServletRequest;
  9. import javax.servlet.http.HttpServletResponse;
  10.  
  11. public class Test_setCookie extends HttpServlet {
  12. 	private static final long serialVersionUID = 1L;
  13.  
  14. 	public void doGet(HttpServletRequest req,HttpServletResponse resp) throws IOException{
  15. 		doPost(req,resp);
  16. 	}
  17. 	public void doPost(HttpServletRequest req,HttpServletResponse resp) throws IOException{
  18. 		resp.setContentType("text/html;charset=utf-8");
  19. 		PrintWriter out=resp.getWriter();
  20. 		req.setCharacterEncoding("utf-8");
  21. 		out.println("<html>");
  22. 		out.println("<head><title>Test Cookie</title></head>");
  23. 		out.println("<body>");
  24.  
  25. 		out.println("<h3>测试set</h3>");
  26.  
  27. 		String userName=req.getParameter("userName");
  28. 		Cookie coo1=new Cookie("userName",userName);
  29. 		coo1.setMaxAge(24*60*60*30);
  30. 		resp.addCookie(coo1);
  31.  
  32. 		out.println("<a href='"
  33. 		+req.getContextPath()
  34. 		+"/get'>"
  35. 		+"查看Cookie</a>");
  36.  
  37. 		out.println("<p>上下文路径->"+req.getContextPath()+"</p>");
  38.  
  39. 		out.println("</body>");
  40. 		out.println("</html>");
  41. 	}
  42.  
  43. }

　　

  1. package com.zhiqi;
  2.  
  3. import java.io.IOException;
  4. import java.io.PrintWriter;
  5.  
  6. import javax.servlet.http.Cookie;
  7. import javax.servlet.http.HttpServlet;
  8. import javax.servlet.http.HttpServletRequest;
  9. import javax.servlet.http.HttpServletResponse;
  10.  
  11. public class Test_getCookie extends HttpServlet {
  12. 	private static final long serialVersionUID = 1L;
  13.  
  14. 	public void doGet(HttpServletRequest req,HttpServletResponse resp) throws IOException{
  15. 		doPost(req,resp);
  16. 	}
  17. 	public void doPost(HttpServletRequest req,HttpServletResponse resp) throws IOException{
  18. 		resp.setContentType("text/html;charset=utf-8");
  19. 		PrintWriter out=resp.getWriter();
  20. 		req.setCharacterEncoding("utf-8");
  21. 		out.println("<html>");
  22. 		out.println("<head><title>Test Cookie</title></head>");
  23. 		out.println("<body>");
  24.  
  25. 		out.println("<h3>测试get</h3>");
  26.  
  27. 		Cookie[] cos=req.getCookies();
  28. 		Cookie c=null;
  29. 		for(int i=0;i<cos.length;i++){
  30. 			c=cos[i];
  31. 			if(c.getName().equals("userName")){
  32. 				out.println("用户名"+c.getValue());
  33. 			}
  34. 		}
  35.  
  36. 		out.println("</body>");
  37. 		out.println("</html>");
  38. 	}
  39.  
  40. }

　　

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <web-app>
  3. 	<servlet>
  4. 		<servlet-name>Test_setCookie</servlet-name>
  5. 		<servlet-class>com.zhiqi.Test_setCookie</servlet-class>
  6. 	</servlet>
  7.  
  8. 	<servlet-mapping>
  9. 		<servlet-name>Test_setCookie</servlet-name>
  10. 		<url-pattern>/set</url-pattern>
  11. 	</servlet-mapping>
  12.  
  13. 	<servlet>
  14. 		<servlet-name>Test_getCookie</servlet-name>
  15. 		<servlet-class>com.zhiqi.Test_getCookie</servlet-class>
  16. 	</servlet>
  17.  
  18. 	<servlet-mapping>
  19. 		<servlet-name>Test_getCookie</servlet-name>
  20. 		<url-pattern>/get</url-pattern>
  21. 	</servlet-mapping>
  22.  
  23. </web-app>

　　

【模型10】Session会话

  1. <!DOCTYPE html>
  2. <html>
  3. <head>
  4. <meta charset="UTF-8">
  5. <title>Insert title here</title>
  6. </head>
  7. <body>
  8.  
  9. <form method="post" action="/Example9/f">
  10. <input type="submit" value="点击" />
  11. </form>
  12.  
  13. </body>
  14. </html>

　　

  1. package com.zhiqi;
  2.  
  3. import java.io.IOException;
  4. import java.io.PrintWriter;
  5. import java.util.Date;
  6. import java.util.Enumeration;
  7.  
  8. import javax.servlet.http.HttpServlet;
  9. import javax.servlet.http.HttpServletRequest;
  10. import javax.servlet.http.HttpServletResponse;
  11. import javax.servlet.http.HttpSession;
  12.  
  13. public class TestSession extends HttpServlet {
  14. 	private static final long serialVersionUID = 1L;
  15.  
  16. 	public void doGet(HttpServletRequest req,HttpServletResponse resp) throws IOException{
  17. 		doPost(req,resp);
  18. 	}
  19. 	public void doPost(HttpServletRequest req,HttpServletResponse resp) throws IOException{
  20. 		resp.setContentType("text/html;charset=utf-8");
  21. 		PrintWriter out=resp.getWriter();
  22. 		out.println("<html>");
  23. 		out.println("<head><title>Test Session</title></head>");
  24. 		out.println("<body>");
  25.  
  26. 		HttpSession session=req.getSession();//创建Session
  27. 		Integer count=(Integer)session.getAttribute("count");
  28. 		if(count==null){
  29. 			count=new Integer(1);
  30. 		}else{
  31. 			count=new Integer(count.intValue()+1);
  32. 		}
  33. 		session.setAttribute("count", count);
  34. 		session.setMaxInactiveInterval(3600);
  35. 		//访问次数
  36. 		out.println("您已经访问了  "+count+"  次<br>");
  37. 		if(session.isNew()){
  38. 			out.println("这是一个新的Session<br>");
  39. 		}else{
  40. 			out.println("这不是一个新的Session<br>");
  41. 		}
  42. 		//返回一个包含分配给该 session 会话的唯一标识符的字符串
  43. 		out.println("getID<br>"+session.getId()+"<br>");
  44. 		//返回客户端最后一次发送与该 session 会话相关的请求的时间
  45. 		out.println("getLastAccessedTime<br>"+session.getLastAccessedTime()+"<br>");
  46. 		out.println("格式化后的getLastAccessedTime<br>"+new Date(session.getLastAccessedTime())+"<br>");
  47. 		//返回该 session 会话被创建的时间
  48. 		out.println("getCreationTime<br>"+session.getCreationTime()+"<br>");
  49. 		out.println("格式化后的getCreationTime<br>"+new Date(session.getCreationTime())+"<br>");
  50. 		//返回 Servlet 容器在客户端访问时保持 session 会话打开的最大时间间隔，以秒为单位。
  51. 		out.println("getMaxInactiveInterval<br>"+session.getMaxInactiveInterval()+"<br>");
  52. 		//返回 String 对象的枚举，String 对象包含所有绑定到该 session 会话的对象的名称
  53. 		Enumeration e=session.getAttributeNames();
  54. 		while(e.hasMoreElements()){
  55. 			String name=(String)e.nextElement();
  56. 			out.println("name<br>"+name+"<br>");
  57. 			//返回在该 session 会话中具有指定名称的对象
  58. 			out.println("getAttribute(name)<br>"+session.getAttribute(name)+"<br>");
  59. 		}
  60.  
  61. 		out.println("</body>");
  62. 		out.println("</html>");
  63. 	}
  64. }

　　

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <web-app>
  3. 	<servlet>
  4. 		<servlet-name>TestSession</servlet-name>
  5. 		<servlet-class>com.zhiqi.TestSession</servlet-class>
  6. 	</servlet>
  7.  
  8. 	<servlet-mapping>
  9. 		<servlet-name>TestSession</servlet-name>
  10. 		<url-pattern>/f</url-pattern>
  11. 	</servlet-mapping>
  12. </web-app>

　　

【模型11】Filter过滤器

  1. 	@Override
  2. 	public void doFilter(ServletRequest sreq, ServletResponse sresp, FilterChain fc)
  3. 			throws IOException, ServletException {
  4. 		HttpServletRequest request=(HttpServletRequest)sreq;
  5. 		HttpSession session=request.getSession();
  6. 		Object o=session.getAttribute("userNames");
  7. 		String path=request.getServletPath();
  8. 		if(o==null && path.indexOf("login.jsp")<0){
  9. 			RequestDispatcher rd=request.getRequestDispatcher("login.jsp");
  10. 			rd.forward(sreq, sresp);
  11. 		}else{
  12. 			fc.doFilter(sreq, sresp);
  13. 		}
  14. 	}

　　

  1. 	<filter>
  2. 		<filter-name>loginFilter</filter-name>
  3. 		<filter-class>com.zhiqi.filter.LoginFilter</filter-class>
  4. 	</filter>
  5. 	<filter-mapping>
  6. 		<filter-name>loginFilter</filter-name>
  7. 		<url-pattern>/*</url-pattern>
  8. 	</filter-mapping>

　　此时如果获取不到session对象啊会把主页mian.jsp转发

【模型12】HttpSessionAttributeListener监听

  1. package com.zhiqi.listener;
  2.  
  3. import javax.servlet.http.HttpSessionAttributeListener;
  4. import javax.servlet.http.HttpSessionBindingEvent;
  5.  
  6. public class SessionAttributeListener implements HttpSessionAttributeListener {
  7.  
  8. 	@Override
  9. 	public void attributeAdded(HttpSessionBindingEvent httpSessionBindingEvent) {
  10. 		System.out.println("添加的属性名"+httpSessionBindingEvent.getName()+"添加的属性值"+httpSessionBindingEvent.getValue());
  11.  
  12. 	}
  13.  
  14. 	@Override
  15. 	public void attributeRemoved(HttpSessionBindingEvent httpSessionBindingEvent) {
  16. 		System.out.println("删除的属性名"+httpSessionBindingEvent.getName()+"删除的属性值"+httpSessionBindingEvent.getValue());
  17.  
  18. 	}
  19.  
  20. 	@Override
  21. 	public void attributeReplaced(HttpSessionBindingEvent httpSessionBindingEvent) {
  22. 		// TODO Auto-generated method stub
  23.  
  24. 	}
  25.  
  26. }

　　

  1. 	<servlet>
  2. 		<servlet-name>LogoutServlet</servlet-name>
  3. 		<servlet-class>com.zhiqi.web.Logout</servlet-class>
  4. 	</servlet>
  5.  
  6. 	<servlet-mapping>
  7. 		<servlet-name>LogoutServlet</servlet-name>
  8. 		<url-pattern>/logout</url-pattern>
  9. 	</servlet-mapping>

　　

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