MyEclipse使用servlet的二个示例
示例一：
工程名：servlet
servlet类名：Firstservlet
FirstServlet.java：
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 FirstServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public FirstServlet() {
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 {
this.log("执行DoGet()方法...");
this.execute(request, response);
/*
* response.setContentType("text/html"); 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.print(" This is ");
* out.print(this.getClass()); out.println(", using the GET method");
* out.println(" </BODY>"); out.println("</HTML>"); out.flush();
* out.close();
*/
}
/**
* 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 {
this.log("执行DoPost()方法...");
this.execute(request, response);
/*
* response.setContentType("text/html"); 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.print(" This is ");
* out.print(this.getClass()); out.println(", using the POST method");
* 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
}
@Override
public long getLastModified(HttpServletRequest request) {
this.log("执行getLastModified方法...");
return -1;
}
private void execute(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setCharacterEncoding("UTF-8");
request.setCharacterEncoding("UTF-8");
String requestURI = request.getRequestURI();
String method = request.getMethod();
String param = request.getParameter("param");
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(" 以" + method + "方式访问该页面。取到的param参数为：" + param + "<br/>");
out
.println(" <form action='"
+ requestURI
+ "' method='get'><input type='text' name='param' value='param string'><input type='submit' value='以GET方式查询页面 "
+ requestURI + "'></form>");
out
.println(" <form action='"
+ requestURI
+ "' method='post'><input type='text' name='param' value='param string'><input type='submit' value='以POST方式提交到页面 "
+ requestURI + "'></form>");
out
.println(" <script>document.write('本页面最后更新时间: ' + document.lastModified);</script>");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
}
web.xml配置：
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 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">
<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>FirstServlet</servlet-name>
<servlet-class>FirstServlet</servlet-class>
<init-param>
<param-name>message</param-name>
<param-value>Welcome to FirstServlet</param-value>
</init-param>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>FirstServlet</servlet-name>
<url-pattern>/servlet/FirstServlet</url-pattern>
<url-pattern>/servlet/FirstServlet.asp</url-pattern>
<url-pattern>/servlet/FirstServlet.jsp</url-pattern>
<url-pattern>/servlet/FirstServlet.aspx</url-pattern>
<url-pattern>/servlet/FirstServlet.php</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<login-config>
<auth-method>BASIC</auth-method>
</login-config>
</web-app>
示例二：
工程名：FirstWeb
servlet类名：HelloServlet.java
HelloServlet.java:
package com.helloweenvsfei.firstweb.HelloServlet;
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 HelloServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public HelloServlet() {
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 {
response.setCharacterEncoding("UTF-8");
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out
.println("<meta Http-equiv=\"content-type\" content=\"text/html;charset=UTF-8\">");
out.println("<HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
String requestURL = request.getRequestURI();
out.println("form action='" + requestURL + "' method='post'>");
out.println("请输入您的名字:<input type='text' name='name' />");
out.println("input type='submit' />");
out.println("");
String name = request.getParameter("name");
if (name != null && name.trim().length() > 0) {
out.println("您好,<b>" + name + "<b>.欢迎您来到java世界.");
}
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
// response.setContentType("text/html");
// 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.print(" This is ");
// out.print(this.getClass());
// out.println(", using the GET method");
// out.println(" </BODY>");
// out.println("</HTML>");
// out.flush();
// out.close();
}
/**
* 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");
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.print(" This is ");
out.print(this.getClass());
out.println(", using the POST method");
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
}
}
web.xml配置：
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
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">
<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>HelloServlet</servlet-name>
<servlet-class>com.helloweenvsfei.firstweb.HelloServlet.HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloServlet</servlet-name>
<url-pattern>/servlet/HelloServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>