详解Spring MVC拦截器实现session控制

未登录，不允许访问background文件夹内的页面，那如何判断是否登录呢？background是关键目录，每个操作该目录的人都需要写在日志表中，如何实现呢？拦截器是实现方案之一。 

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

 
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; 
 
 
@Repository 
public class SystemInterceptor extends HandlerInterceptorAdapter { 
 
  @Resource(name = "systemLoggerService") 
  private SystemLoggerService systemLoggerService; 
 
   
  @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(""); 
   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 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

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。