如何配置Servlet

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Servlet/JSP

Servelet

配置Servlet有两种方法：

1.直接创建Servlet

例如：在BSystem项目下的com.sky.servlet包下创建UserServlet

在src下右击“new”，选择“servlet”，出现“Servlet Wizard”界面：

其中“superclass”已经选择“javax.servlet.http.HttpServlet",

点击”next”，出现“XML Wizard”界面：

修改“Servlet/JSP Mapping URL”中的值，可以修改成“/UserServlet”，也可以不修改，点击“Finsh”。

完成后，会出现在com.sky.servlet包下出现一个“UserServlet.java”文件。里面的内容如下：

package com.sky.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 UserServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public UserServlet() {
		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.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();
	}

你可以在你所需要的方法中写相应代码。

直接创建Servlet，会在/WebRoot/WEB-INF/web.xml的配置文件中增加以下内容：

  <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>UserServlet</servlet-name>
    <servlet-class>com.sky.servlet.UserServlet</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>UserServlet</servlet-name>
    <url-pattern>/servlet/UserServlet</url-pattern>
  </servlet-mapping>

其中的配置信息和“XML Wizard”界面中的信息是一致的。

2 手动的配置

（1）创建一个普通的class文件UserServlet.java文件。让其继承至于HttpServlet类，并继承其类中的方法。

（2）在WebRoot/WEB-INF/web.xml文件中配置，其配置信息和第一种方法中的WebRoot/WEB-INF/web.xml相似。

ps：其中<description></description>内中的信息可以省略点。

其实两种方法也是一种方法，无非是第一种不用写配置文件，MyEclipse会根据你在创建Servlet时输入的配置信息，自动生成。