（四）springmvc之获取servlet原生对象

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一、使用DI注入的方式

<a href="<%=request.getContextPath()%>/servletObj_1">DI注入的方式</a>

controller

package com.controller.servletobj;

import java.io.PrintWriter;

import javax.servlet.ServletContext;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.servlet.ModelAndView;

@Controller

public class ServletObj_1 {

    @Autowired

    private HttpServletRequest request;

    @Autowired

    private HttpServletResponse response;

    @Autowired

    private HttpSession session;

    @Autowired

    private ServletContext servletContext;

    @RequestMapping(value = "/servletObj_1")

    public ModelAndView exuecte() throws Exception {

        response.setContentType("text/html");

        String contextPath = request.getContextPath();

        String sessionID = session.getId();

        String indexPath = servletContext.getRealPath("/index.jsp");

        PrintWriter out = response.getWriter();

        out.println("contextPath = " + contextPath+"<br/><br/>");

        out.println("sessionID = " + sessionID+"<br/><br/>");

        out.println("indexPath = " + indexPath+"<br/><br/>");

        out.flush();

        out.close();

        return null;

    }

}

二、形参传入的方式：ServletContext不能通过形参的方式注入，

<a href="<%=request.getContextPath()%>/servletObj_2">形参传入的方式</a>

controller

package com.controller.servletobj;

import java.io.PrintWriter;

import javax.servlet.ServletContext;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.servlet.ModelAndView;

@Controller

public class ServletObj_2 {

    @RequestMapping(value = "/servletObj_2")

    public ModelAndView exuecte(HttpServletRequest request,

            HttpServletResponse response, HttpSession session) throws Exception {

        response.setContentType("text/html");

        /**

         * ServletContext不能通过形参的方式注入，

         *

         * 通过其他对象来进行获取。

         */

        ServletContext servletContext = request.getServletContext();

        String contextPath = request.getContextPath();

        String sessionID = session.getId();

        String indexPath = servletContext.getRealPath("/index.jsp");

        PrintWriter out = response.getWriter();

        out.println("contextPath = " + contextPath + "<br/><br/>");

        out.println("sessionID = " + sessionID + "<br/><br/>");

        out.println("indexPath = " + indexPath + "<br/><br/>");

        out.flush();

        out.close();

        return null;

    }

}

ServletContext不能通过形参的方式注入，

三、拦截器的方式：只能注入ServletContextAware和ServletConfigAware接口

    <a href="<%=request.getContextPath()%>/servletObj_3">拦截器的方式</a>

controller

package com.controller.servletobj;

import java.io.PrintWriter;

import javax.servlet.ServletConfig;

import javax.servlet.ServletContext;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.context.ServletConfigAware;

import org.springframework.web.context.ServletContextAware;

import org.springframework.web.servlet.ModelAndView;

/**

 * 通过拦截器来注入,只能注入ServletContextAware和ServletConfigAware接口

 *

 */

@Controller

public class ServletObj_3 implements ServletContextAware, ServletConfigAware {

    private ServletContext servletContext;

    private ServletConfig servletConfig;

    @Override

    public void setServletContext(ServletContext servletContext) {

        this.servletContext = servletContext;

    }

    @Override

    public void setServletConfig(ServletConfig servletConfig) {

        this.servletConfig = servletConfig;

    }

    @RequestMapping(value = "/servletObj_3")

    public ModelAndView exuecte(HttpServletRequest request,

            HttpServletResponse response, HttpSession session) throws Exception {

        response.setContentType("text/html");

        String contextPath = request.getContextPath();

        String sessionID = session.getId();

        String indexPath = this.servletContext.getRealPath("/index.jsp");

        PrintWriter out = response.getWriter();

        out.println("contextPath = " + contextPath + "<br/><br/>");

        out.println("sessionID = " + sessionID + "<br/><br/>");

        out.println("indexPath = " + indexPath + "<br/><br/>");

        out.flush();

        out.close();

        return null;

    }

}