在SpringMVC中操作Session、Request、Response对象

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示例

@Service

public class UserServiceImpl implements UserService {

    @Autowired

    private UserMapper userMapper;

    @Override

    public void addOne(UserInput input) throws Exception {

        Integer id = userMapper.insert(input);

        setSessionAttribute("userId", id, Integer.class);

    }

    @Override

    public void rollbackAdd() throws Exception {

        Integer id = getSessionAttribute("userId", Integer.class);

        userMapper.remove(id);

    }

    private <T> void setSessionAttribute(String key, T value, Class<T> valueClass) {

        RequestAttributes ra = RequestContextHolder.currentRequestAttributes();

        ra.setAttribute(key, value, RequestAttributes.SCOPE_SESSION);

    }

    @SuppressWarnings("unchecked")

    private <T> T getSessionAttribute(String key, Class<T> valueClass) {

        RequestAttributes ra = RequestContextHolder.currentRequestAttributes();

        Object value = ra.getAttribute(key, RequestAttributes.SCOPE_SESSION);

        return (T) value;

    }

}

主要是利用到了RequestContextHolder这个类。

除此以外，还能通过RequestAttributes对象，分别获得Session、Request、Response对象

    /**

     * 获取HttpServletRequest对象

     */

    public static HttpServletRequest instance() {

        RequestAttributes ra = RequestContextHolder.currentRequestAttributes();

        HttpServletRequest request = ((ServletRequestAttributes) ra).getRequest();

        return request;

    }

    /**

     * 获取HttpServletResponse对象

     */

    public static HttpServletResponse instance() {

        RequestAttributes ra = RequestContextHolder.currentRequestAttributes();

        HttpServletResponse response = ((ServletRequestAttributes) ra).getResponse();

        return response;

    }

    /**

     * 获取HttpSession对象

     */

    public static HttpSession instance() {

        RequestAttributes ra = RequestContextHolder.currentRequestAttributes();

        HttpServletRequest request = ((ServletRequestAttributes) ra).getRequest();

        HttpSession session = request.getSession();

        return session;

    }