Spring MVC，拦截器实现session控制

import java.io.PrintWriter;
import java.util.Iterator;
import java.util.Map;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Repository;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
 

@Repository
public class SystemInterceptor extends HandlerInterceptorAdapter {

	@Resource(name = "systemLoggerService")
	private SystemLoggerService systemLoggerService;

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.springframework.web.servlet.handler.HandlerInterceptorAdapter#
	 * preHandle (javax.servlet.http.HttpServletRequest,
	 * javax.servlet.http.HttpServletResponse, java.lang.Object)
	 */
	@SuppressWarnings({ "rawtypes", "unchecked" })
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {

		request.setCharacterEncoding("UTF-8");
		response.setCharacterEncoding("UTF-8");
		response.setContentType("text/html;charset=UTF-8");

		// 后台session控制
		String[] noFilters = new String[] { "login.html", "veriCode.html", "index.html", "logout.html" };
		String uri = request.getRequestURI();

		if (uri.indexOf("background") != -1) {
			boolean beFilter = true;
			for (String s : noFilters) {
				if (uri.indexOf(s) != -1) {
					beFilter = false;
					break;
				}
			}
			if (beFilter) {
				Object obj = request.getSession().getAttribute(Constants.LOGINED);
				if (null == obj) {

					// 未登录
					PrintWriter out = response.getWriter();
					StringBuilder builder = new StringBuilder();
					builder.append("<script type=\"text/javascript\" charset=\"UTF-8\">");
					builder.append("alert(\"页面过期，请重新登录\");");
					builder.append("window.top.location.href=\"");
					builder.append(Constants.basePath);
					builder.append("/background/index.html\";</script>");
					out.print(builder.toString());
					out.close();
					return false;
				} else {
					// 添加日志
					String operateContent = Constants.operateContent(uri);
					if (null != operateContent) {
						String url = uri.substring(uri.indexOf("background"));
						String ip = request.getRemoteAddr();
						Integer userId = ((SystemUserForm) obj).getId();
						SystemLoggerForm form = new SystemLoggerForm();
						form.setUserId(userId);
						form.setIp(ip);
						form.setOperateContent(operateContent);
						form.setUrl(url);
						this.systemLoggerService.edit(form);
					}
				}
			}
		}

		Map paramsMap = request.getParameterMap();

		for (Iterator<Map.Entry> it = paramsMap.entrySet().iterator(); it.hasNext();) {
			Map.Entry entry = it.next();
			Object[] values = (Object[]) entry.getValue();
			for (Object obj : values) {
				if (!DataUtil.isValueSuccessed(obj)) {
					throw new RuntimeException("有非法字符：" + obj);
				}
			}
		}

		return super.preHandle(request, response, handler);
	}

}