Spring MVC，拦截器实现session控制

(1) 在com.geloin.spring.interceptor包中添加SystemInterceptor，并使其继承HandlerInterceptor

/**
 *
 * @author geloin
 * @date 2012-3-27 下午2:29:35
 */
package com.geloin.spring.interceptor;

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;

import com.embest.ruisystem.form.SystemLoggerForm;
import com.embest.ruisystem.form.SystemUserForm;
import com.embest.ruisystem.service.SystemLoggerService;
import com.embest.ruisystem.util.Constants;
import com.embest.ruisystem.util.DataUtil;

/**
 *
 * @author geloin
 * @date 2012-3-27 下午2:29:35
 */
@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);
    }

}

        (2) 修改context-dispatcher.xml，让spring管理拦截器

<mvc:interceptors>
    <bean class="com.geloin.spring.interceptor.SystemInterceptor" />
</mvc:interceptors>
转载自：http://www.linuxidc.com/Linux/2012-05/61505.htm