BlogJava-Java-文章分类-Servlet 笔记http://www.blogjava.net/keer2345/category/33155.htmlJavazh-cnTue, 12 Aug 2008 14:21:37 GMTTue, 12 Aug 2008 14:21:37 GMT60Servlet03: 同一用户的不同页面共享数据http://www.blogjava.net/keer2345/articles/220994.htmlkeerkeerSat, 09 Aug 2008 04:45:00 GMThttp://www.blogjava.net/keer2345/articles/220994.htmlhttp://www.blogjava.net/keer2345/comments/220994.htmlhttp://www.blogjava.net/keer2345/articles/220994.html#Feedback0http://www.blogjava.net/keer2345/comments/commentRss/220994.htmlhttp://www.blogjava.net/keer2345/services/trackbacks/220994.html方法一：sendRedirct()方法。 通过sendRedirct()方法将信息传送给下一个页面，比如：
response.sendRedirect("welcome?name="+u+"&password="+p);    //若多个值，中间用 & 隔开
优点：传送信息的速度比较快
缺点：它只能传送字符串，而不能传送一个对象


方法二：隐藏表单

这是最常见、最简单的一种方式，但有时该技巧非常管用



keer 2008-08-09 12:45 发表评论
]]>Servlet02: 简单的用户登陆网站http://www.blogjava.net/keer2345/articles/216187.htmlkeerkeerSun, 20 Jul 2008 08:42:00 GMThttp://www.blogjava.net/keer2345/articles/216187.htmlhttp://www.blogjava.net/keer2345/comments/216187.htmlhttp://www.blogjava.net/keer2345/articles/216187.html#Feedback0http://www.blogjava.net/keer2345/comments/commentRss/216187.htmlhttp://www.blogjava.net/keer2345/services/trackbacks/216187.html version 1.0 包含的功能：
    1、进行简单的用户验证
知识点：   
    1、如何使用servlet开发动态网页
    2、如何从一个页面跳转到另一个页面 response.sendRedirect(String)

代码：
/**
 * @(#)Login.java
 *
 *
 * @author 
 * @version 1.00 2008/7/20
 */

package com.keer2345;

import javax.servlet.http.*;
import java.io.*;

public class Login extends HttpServlet {
    
    public void doGet(HttpServletRequest request, HttpServletResponse response)    {
        try    {
            
            response.setContentType("text/html;charset=utf-8");
            
            PrintWriter pw = response.getWriter();
            
            pw.println("<html>");
            pw.println("<body>");
            pw.println("<form action=loginCheck method=post>");
            pw.println("用户名:<input type=text name=username><br>");
            pw.println("密  码:<input type=password name=password><br>");
            pw.println("<input type=submit value=Login>");
            pw.println("</form>");
            pw.println("</body>");
            pw.println("</html>");
        }
        catch(Exception ex){
            ex.printStackTrace();
        }
    }

     public void doPost(HttpServletRequest request, HttpServletResponse response)    {
         
         this.doGet(request,response);
         
     } 
    
}

/**
 * @(#)LoginCheck.java
 *
 *
 * @author 
 * @version 1.00 2008/7/20
 */

package com.keer2345;

import javax.servlet.http.*;
import java.io.*;

public class LoginCheck extends HttpServlet {
    
    public void doGet(HttpServletRequest request, HttpServletResponse response)    {
        
        try {
            String username = request.getParameter("username");
            String password = request.getParameter("password");    
                
            response.setContentType("text/html;charset=utf-8");
            
            PrintWriter pw = response.getWriter();
                
            if (username.equals("keer2345") && password.equals("keer2345"))    {
                
                pw.println("<h1><center>Welcome!</center></h1>");
                pw.println("<center><a href=login>Try again!</a></center>");
                
            }    else    {
                response.sendRedirect("login");
            }
                        
        }
        catch (Exception ex) {
            ex.printStackTrace();
        }
    }
    
    public void doPost(HttpServletRequest request, HttpServletResponse response)    {
         
         this.doGet(request,response);
         
     }     
    
}

<?xml version="1.0" encoding="ISO-8859-1"?>

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
   version="2.5">
        
    <servlet>
        <servlet-name>login</servlet-name>
        <servlet-class>com.keer2345.Login</servlet-class>
    </servlet>
    
    <servlet-mapping>
        <servlet-name>login</servlet-name>
        <url-pattern>/login</url-pattern>
    </servlet-mapping>
    
    <servlet>
        <servlet-name>check</servlet-name>
        <servlet-class>com.keer2345.LoginCheck</servlet-class>
    </servlet>
    
    <servlet-mapping>
        <servlet-name>check</servlet-name>
        <url-pattern>/loginCheck</url-pattern>
    </servlet-mapping>
    
</web-app>




keer 2008-07-20 16:42 发表评论
]]>Servlet01: 第一个servlet例子http://www.blogjava.net/keer2345/articles/216168.htmlkeerkeerSun, 20 Jul 2008 06:16:00 GMThttp://www.blogjava.net/keer2345/articles/216168.htmlhttp://www.blogjava.net/keer2345/comments/216168.htmlhttp://www.blogjava.net/keer2345/articles/216168.html#Feedback0http://www.blogjava.net/keer2345/comments/commentRss/216168.htmlhttp://www.blogjava.net/keer2345/services/trackbacks/216168.html第一种方法：通过实现servlet接口的方式来开发。 1、配置WEB-INF文件夹，内再建立classes和lib两个文件夹
2、开发servlet（引入servlet-api.jar）
 1 //Hello.java
 2 
 3 package com.keer2345;
 4 
 5 import javax.servlet.*;
 6 import java.io.*;
 7 import javax.servlet.ServletConfig;
 8 import javax.servlet.ServletException;
 9 import javax.servlet.ServletRequest;
10 import javax.servlet.ServletResponse;
11 import java.io.IOException;
12 
13 public class Hello implements Servlet{
14 
15     public void init(ServletConfig parm1) throws ServletException {
16         // TODO: Add your code here
17     }
18 
19     public ServletConfig getServletConfig() {
20         // TODO: Add your code here
21         return null;
22     }
23 
24     public void service(ServletRequest request, ServletResponse response) throws ServletException, IOException {
25         // TODO: Add your code here
26         PrintWriter pw = response.getWriter();
27         pw.println("Hello World!");
28     }
29 
30     public String getServletInfo() {
31         // TODO: Add your code here
32         return null;
33     }
34 
35     public void destroy() {
36         // TODO: Add your code here
37     }
38     
39 }

3、部署servlet（web.xml）
 1 <?xml version="1.0" encoding="ISO-8859-1"?>
 2 
 3 <web-app xmlns="http://java.sun.com/xml/ns/javaee"
 4    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 5    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
 6    version="2.5">
 7 
 8     <servlet>
 9         <servlet-name>hello</servlet-name>
10         <servlet-class>com.keer2345.Hello</servlet-class>
11     </servlet>
12     
13     <servlet-mapping>
14         <servlet-name>hello</servlet-name>
15         <url-pattern>/hello</url-pattern>
16     </servlet-mapping>
17 
18 </web-app>


4、启动tomcat，访问http://127.0.0.1:8080/keer2345/hello。


第二种方法：通过继承GenericServle开发servlet

HelloGen.java
 1 package com.keer2345;
 2 
 3 import javax.servlet.*;
 4 import javax.servlet.GenericServlet;
 5 import java.io.*;
 6 
 7 public class HelloGen extends GenericServlet {
 8 
 9     public HelloGen() {
10     }
11     
12     public void service(ServletRequest request, ServletResponse response) {
13         try {
14             PrintWriter pw = response.getWriter();
15             pw.println("Hello GenericServlet!");
16         }
17         catch(Exception ex) {
18             ex.printStackTrace();
19         }
20     }    
21     
22 }


第三种方法：通过继承HttpServlet开发Servlet

HelloHttp.java
 1 package com.keer2345;
 2 
 3 import javax.servlet.http.*;
 4 import java.io.*;
 5 
 6 public class HelloHttp extends HttpServlet {
 7     
 8     public void doGet(HttpServletRequest request, HttpServletResponse response) {
 9         
10         try {
11             PrintWriter pw = response.getWriter();
12             pw.println("Hello HttpServlet!");
13         }
14         catch(Exception ex) {
15             ex.printStackTrace();
16         }
17         
18     } 
19     
20     public void doPost(HttpServletRequest request, HttpServletResponse response) {
21         
22         this.doGet(request, response);
23         
24     }  
25 }

web.xml
 1 <?xml version="1.0" encoding="ISO-8859-1"?>
 2 
 3 <web-app xmlns="http://java.sun.com/xml/ns/javaee"
 4    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 5    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
 6    version="2.5">
 7 
 8     <servlet>
 9         <servlet-name>hello</servlet-name>
10         <servlet-class>com.keer2345.Hello</servlet-class>
11     </servlet>
12     
13     <servlet-mapping>
14         <servlet-name>hello</servlet-name>
15         <url-pattern>/hello</url-pattern>
16     </servlet-mapping>
17     
18     <servlet>
19         <servlet-name>helloGen</servlet-name>
20         <servlet-class>com.keer2345.HelloGen</servlet-class>
21     </servlet>
22     
23     <servlet-mapping>
24         <servlet-name>helloGen</servlet-name>
25         <url-pattern>/helloGen</url-pattern>
26     </servlet-mapping>
27     
28         <servlet>
29         <servlet-name>helloHttp</servlet-name>
30         <servlet-class>com.keer2345.HelloHttp</servlet-class>
31     </servlet>
32     
33     <servlet-mapping>
34         <servlet-name>helloHttp</servlet-name>
35         <url-pattern>/helloHttp</url-pattern>
36     </servlet-mapping>
37 
38 
39 </web-app>







keer 2008-07-20 14:16 发表评论
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