springMVC基础controller类

此文章是基于 搭建SpringMVC+Spring+Hibernate平台

功能：设置请求、响应对象；session、cookie操作；ajax访问返回json数据；

创建springMVC基础controller类：

　　　　BaseController.java

package com.ims.web.controller;
import java.io.IOException;
import java.net.URLDecoder;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

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

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;

public class BaseController {
    /**
     *  AJAX访问返回操作成功状态标识符
     */
    protected static final String STATUS_SUCCESS = "success";
    /**
     *  AJAX访问返回操作失败状态标识符
     */
    protected static final String STATUS_ERROR = "error";

    protected HttpServletRequest request;
    protected HttpServletResponse response;
    protected HttpSession session;

    /**
     * 每个controller方法执行前被执行
     */
    @ModelAttribute
    public void setReqAndRes(HttpServletRequest request,
            HttpServletResponse response) {
        this.request = request;
        this.response = response;
        this.session = request.getSession();
    }

    /**
     * 取得session中的值
     * @param name session主键
     * @return 主键对应的值
     */
    public Object getSession(String name) {
        return session.getAttribute(name);
    }

    /**
     * 往session中添加键值对
     * @param name session主键
     * @param obj session值
     */
    public void setSession(String name, Object obj) {
        session.setAttribute(name, obj);
    }

    /**
     * 添加cookie
     * @param key cookie主键
     * @param value cookie值
     */
    public void addCookie(String key, String value){
        Cookie cookie = new Cookie(key, value);
        cookie.setPath("/");// 这个要设置
        cookie.setMaxAge(60*60*24*30);//保留一个月 以秒为单位
        response.addCookie(cookie);
    }

    /**
     * 删除cookie
     * @param key cookie主键
     */
    public void deleteCookie(String key){
        Cookie cookies[] = request.getCookies();
        if (cookies != null) {
            for (int i = 0; i < cookies.length; i++) {
                if (cookies[i].getName().equals(key)) {
                    Cookie cookie = new Cookie(key,null);
                    cookie.setPath("/");//设置成跟写入cookies一样的
                    cookie.setMaxAge(0);
                    response.addCookie(cookie);
                }
            }
        }
    }

    /**
     * 取得cookie的值
     * @param key cookie主键
     */
    public String getCookieValue(String key) {
        String cookieVal = null;
        for(Cookie cookie : request.getCookies()){
            if (cookie.getName().equals(key)) {
                try {
                    cookieVal = URLDecoder.decode(cookie.getValue(), "UTF-8");
                } catch (Exception e) {}
                break;
            }
        }
        return cookieVal;
    }

    /**
     * 取得访问项目的url
     */
    public String getBaseUrl(){
        return request.getScheme() + "://"
                + request.getServerName() + ":" + request.getServerPort()
                + request.getContextPath() ;
    }

    /**
     * ajax输出
     * @param content 输出的文本内容
     * @param type 输出的文本类内容
     */
    public void ajax(String content, String type) {
        try {
            response.setContentType(type + ";charset=UTF-8");
            response.setHeader("Pragma", "No-cache");
            response.setHeader("Cache-Control", "no-cache");
            response.setDateHeader("Expires", 0);
            response.getWriter().write(content);
            response.getWriter().flush();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 响应json格式的字符串
     * @param content json格式的字符串
     */
    public void ajax(String content) {
        ajax(content, "application/json");
    }

    /**
     * 响应带状态的json格式的数据
     * @param status
     * @param content
     */
    public void ajaxJson(String status, Object content){
        String json = "{\"status\" : \""+status+"\", " +
                "\"message\" : "+JSON.toJSONString(content)+" }";
        ajax(json, "application/json");
    }

    /**
     * 响应json格式的数据
     * @param content
     */
    public void ajaxJson(Object content) {
        String json = JSON.toJSONString(content, SerializerFeature.WriteDateUseDateFormat);
        ajax(json, "application/json");
    }

}