一、获取请求参数
String getParameter(String name)若请求参数有多个值（例如CheckBox），该方法只能获取到第一个提交的值
String[] getParameterValues(String name)根据请求参数的名字，返回请求参数对应的字符串数组
Enumeration getParameterNames()返回参数名对应的enumeration对象，类似于ServletConfig或ServletContext的getInitParameterNames()方法
Map getParameterMap()返回请求参数的键值对
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@Override
public void service(ServletRequest request, ServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
System.out.println("received request");
String user = request.getParameter("username");
String password = request.getParameter("password");
System.out.println("username: " + user + " / password : " + password);
String[] lovers = request.getParameterValues("love");
for(String love : lovers) {
System.out.println("-->" + love);
}
Enumeration<String> loverse = request.getParameterNames();
while(loverse.hasMoreElements()) {
String name = loverse.nextElement();
String value = request.getParameter(name);
System.out.println("name : " + name + " / value : " + value);//当为CheckBox等同一个name的参数有多个value时，只返回第一个
}
Map<String , String[] > map = request.getParameterMap();
for(Map.Entry<String, String[]> entry : map.entrySet()) {
System.out.println("***" + entry.getKey() + ":" + Arrays.asList(entry.getValue()));
}
}二、获取请求URL
三、获取请求方式
四、获取servlet映射路径
HttpServletRequest是servletRequest的子接口，针对于HTTP请求定义，里边包含了大量获取http请求相关的方法
//先把ServletRequest的对象强制转换成HttpServletRequest
HttpServletRequest httpServletRequest = (HttpServletRequest) request;
String requestURI = httpServletRequest.getRequestURI();
System.out.println("requestURI :" + requestURI);//输出requestURI :/day_0206/TTT
System.out.println("requestURL :" + httpServletRequest.getRequestURL());//输出requestURL :http://localhost:8989/day_0206/TTT
String method = httpServletRequest.getMethod();
System.out.println(" method :" + method);//输出method :POST
System.out.println("queryString :" + httpServletRequest.getQueryString());//输出queryString :null
System.out.println("servletPath :" + httpServletRequest.getServletPath());//输出servletPath :/TTT若method为get则queryString如下
method :GET
queryString :username=fv&password=ttt&love=deft&love=meiko
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