shangrila-xiu

112
文章
101
分类
33
标签

ServletStudy1

学习servlet的旅程一

1、首先是在myeclipse中创建web工程，并且写第一个sevlet程序。获取初始化参数.

a:下面是在web.xml中配置上这句话

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
<servlet>
   <description>This is the description of my J2EE component</description>
   <display-name>This is the display name of my J2EE component</display-name>
   <servlet-name>Getinit</servlet-name>
   <servlet-class>Servlet.Getinit</servlet-class>
   <init-param>
   <param-name>logname</param-name>
   <param-value>admin</param-value>
   </init-param>
   <init-param>
   <param-name>password</param-name>
   <param-value>123</param-value>
   </init-param>
   
 </servlet>

b:在sevlet的包下面创建一个Getinit.java。代码如下：

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
package Servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Getinit extends HttpServlet {
	private String logname;//用户名
	private String password;//密码
	
	
	public String getLogname() {
		return logname;
	}
	public void setLogname(String logname) {
		this.logname = logname;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	/**
	 * Constructor of the object.
	 */
	public Getinit() {
		super();
	}
	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}
	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doPost(request,response);
	}
	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		out.println("<h2>"+"用户名；"+this.getLogname()+"</h2>");
		out.println("<h2>"+"密码："+this.getPassword()+"</h2>");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}
	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
		this.setLogname(this.getInitParameter("logname"));
		this.setPassword(this.getInitParameter("password"));
		}
}

c:接下来的就是初始化页面了。代码如下：

1
2
3
4
 <!--省略的部分代码-->
<h1>获取初始化参数</h1>
    <a href="servlet/Getinit">点击获取初始化参数</a>
<!--省略的部分代码-->