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ServletRequest和ServletResponse

1 两个接口的实现类都是服务器给予实现的,并在服务器调用service方法传入

2 ServletRequest 可以获取任何请求信息:

1)获取请求参数:

   String getParameter(String name):根据请求参数名字,返回参数值

   若请求参数有多个值(checkbox),只能取到第一个提交的值

  String[] getParameterValues(String name)

  Enumeration getParameterNames()

  Map getParameterMap()

2) 获取请求的URI,请求参数的字符串等等用HttpServletRequest下的方法

public class TranServlet implements Servlet {    /**     * Constructor of the object.     */    public TranServlet() {        super();    }    public ServletConfig getServletConfig() {        // TODO Auto-generated method stub        return null;    }    public String getServletInfo() {        // TODO Auto-generated method stub        return null;    }    public void init(ServletConfig config) throws ServletException {        System.out.println("init");            }    public void service(ServletRequest req, ServletResponse res)            throws ServletException, IOException {        System.out.println("service");        String account = req.getParameter("account");        String password = req.getParameter("password");        System.out.println(account+" "+password);                String[] hobbies = req.getParameterValues("hobby");        for(String h:hobbies){            System.out.println(h);        }        Enumeration<String> en = req.getParameterNames();        while(en.hasMoreElements()){            String name = en.nextElement();            String value = req.getParameter(name);            System.out.println(name+"+++"+value);        }        Map<String,String[]> map = req.getParameterMap();        for(Map.Entry<String, String[]> entry: map.entrySet()){            String key = entry.getKey();            List<String> values = Arrays.asList(entry.getValue());            System.out.println(key+"***"+values);        }        HttpServletRequest hsr = (HttpServletRequest)req;        String uri = hsr.getRequestURI();        String method = hsr.getMethod();        String querystring = hsr.getQueryString();        System.out.println(uri);        System.out.println(method);        System.out.println(querystring);    }    public void destroy() {            }}

ServletRequest和ServletResponse