《Servlet与JSP核心编程第二版》阅读记录006-读取表单数据

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读取页面数据

1 网页文件 D:\java_project\servlet_practice\html\ThreeParamsForm.htm

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<HTML><HEAD><TITLE>Collecting Three Parameters</TITLE></HEAD>
<BODY BGCOLOR="#FDF5E6">
<H1 ALIGN="CENTER">Collecting Three Parameters</H1>

<FORM ACTION="/servlet/coreservlets.ThreeParams">
First Parameter: <INPUT TYPE="TEXT" NAME="param1"><BR>
Second Parameter: <INPUT TYPE="TEXT" NAME="param2"><BR>
Third Parameter: <INPUT TYPE="TEXT" NAME="param3"><BR>
<CENTER><INPUT TYPE="SUBMIT"></CENTER>
</FORM>

</BODY></HTML>

2 servlet处理文件 D:\java_project\servlet_practice\src\java\coreservlets\ThreeParams.java

package coreservlets;

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

/** Simple servlet that reads three parameters from the
* form data.
* <P>
* Taken from Core Servlets and JavaServer Pages 2nd Edition
* from Prentice Hall and Sun Microsystems Press,
* http://www.coreservlets.com/.
* © 2003 Marty Hall; may be freely used or adapted.
*/

public class ThreeParams extends HttpServlet {
public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
      throws ServletException, IOException {
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    String title = "Reading Three Request Parameters";
    String docType =
      "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " +
      "Transitional//EN\">\n";
    out.println(docType +
                "<HTML>\n" +
                "<HEAD><TITLE>" + title + "</TITLE></HEAD>\n" +
                "<BODY BGCOLOR=\"#FDF5E6\">\n" +
                "<H1 ALIGN=\"CENTER\">" + title + "</H1>\n" +
                "<UL>\n" +
                " <LI><B>param1</B>: "
                + request.getParameter("param1") + "\n" +
                " <LI><B>param2</B>: "
                + request.getParameter("param2") + "\n" +
                " <LI><B>param3</B>: "
                + request.getParameter("param3") + "\n" +
                "</UL>\n" +
                "</BODY></HTML>");
}
}

3 修改配置文件 web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
    PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
    "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>

<servlet>
    <servlet-name>HelloServlet</servlet-name>
    <servlet-class>HelloServlet</servlet-class>
</servlet>
<servlet>
    <servlet-name>HelloServlet2</servlet-name>
    <servlet-class>coreservlets.HelloServlet2</servlet-class>
</servlet>
<servlet>
    <servlet-name>HelloServlet3</servlet-name>
    <servlet-class>coreservlets.HelloServlet3</servlet-class>
</servlet>
<servlet>
    <servlet-name>ThreeParams</servlet-name>
    <servlet-class>coreservlets.ThreeParams</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>HelloServlet</servlet-name>
    <url-pattern>/Helloservlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
    <servlet-name>HelloServlet2</servlet-name>
    <url-pattern>/Helloservlet2</url-pattern>
</servlet-mapping>
<servlet-mapping>
    <servlet-name>HelloServlet3</servlet-name>
    <url-pattern>/Helloservlet3</url-pattern>
</servlet-mapping>
<servlet-mapping>
    <servlet-name>ThreeParams</servlet-name>
    <url-pattern>/servlet/coreservlets.ThreeParams</url-pattern>
</servlet-mapping>

</web-app>
4 访问页面

http://127.0.0.1:8080/html/ThreeParamsForm.htm

5 输出结果

http://127.0.0.1:8080/servlet/coreservlets.ThreeParams?param1=11&param2=22&param3=33aa

Reading Three Request Parameters

param1: 11
param2: 22
param3: 33

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