Servlet(4)—一个简单的Servlet实例

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简单实例
- 页面请求登陆，提交表单数据

<body>    <form action="loginServlet" method="get">        user：<input type="text" name="user"/>        <br>        password：<input type="password" name="password"/>        <br>        interesting：        <input type="checkbox" name="interesting" value="read"/>read        <input type="checkbox" name="interesting" value="walk"/>walk        <input type="checkbox" name="interesting" value="swing"/>swing        <input type="checkbox" name="interesting" value="shopping"/>shopping        <input type="checkbox" name="interesting" value="tv"/>TV        <br>        <input type="submit" value="Submit"/>    </form></body>

web.xml配置文件

  <servlet>    <servlet-name>loginServlet</servlet-name>    <servlet-class>servlet.loginServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>loginServlet</servlet-name>    <url-pattern>/loginServlet</url-pattern>  </servlet-mapping>

loginServlet实现Servlet接口，用于处理登陆请求

public class loginServlet implements Servlet {    @Override    public void destroy() {    }    @Override    public ServletConfig getServletConfig() {        return null;    }    @Override    public String getServletInfo() {        return null;    }    @Override    public void init(ServletConfig arg0) throws ServletException {    }    @Override    public void service(ServletRequest request, ServletResponse response)            throws ServletException, IOException {        System.out.println("请求来了...");        //获取指定参数名的参数值        String user = request.getParameter("user");        String password = request.getParameter("password");        System.out.println(user + ", " + password);        String interest = request.getParameter("interesting");        System.out.println(interest);        //获取指定参数名的一组参数值        String [] values = request.getParameterValues("interesting");        for(String value : values){            System.out.println("--"+value);        }        //获取Enumeration对象        Enumeration<String> names = request.getParameterNames();        while(names.hasMoreElements()){            String name = names.nextElement();            String value = request.getParameter(name);            System.out.println("^^" + name + ":" + value);        }        //获取参数值的键值对        Map<String, String[]> map = request.getParameterMap();         for(Map.Entry<String, String[]> entry : map.entrySet()){            System.out.println("**" + entry.getKey() + ": " + Arrays.asList(entry.getValue()));        }        //获取请求的URI        HttpServletRequest httpServletRequest = (HttpServletRequest)request;        String requestURI = httpServletRequest.getRequestURI();        System.out.println("requestURI：" + requestURI);        //获取请求的方式        String method = httpServletRequest.getMethod();        System.out.println("请求方式：" + method);        //获取请求的查询字符串（当然请求方式为get，否则哪来的请求参数）        String queryString = httpServletRequest.getQueryString();        System.out.println("查询字符串：" + queryString);        //获取Servlet的映射路径，就是配置在web.xml中的配置信息        String servletPath = httpServletRequest.getServletPath();        System.out.println("servletPath：" + servletPath);        //返回响应类型        response.setContentType("application/msword");        //返回响应信息        PrintWriter out = response.getWriter();        out.println("helloWorld");    }}

获取到表单提交的数据

请求来了...tengpengfei, 817425read--read--walk^^user:tengpengfei^^password:817425^^interesting:read**user: [tengpengfei]**password: [817425]**interesting: [read, walk]requestURI：/Demo4_servlet/loginServlet请求方式：GET查询字符串：user=tengpengfei&password=817425&interesting=read&interesting=walkservletPath：/loginServlet

问题

因为继承Servlet从而必须实现接口中所有的方法，但有些方法
用不到，就会产生多余代码，为了解决这个问题，可以自己定义一个Servlet

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