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

/** 
 * 
 * @author geloin 
 */ 
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 
 */ 
@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> 

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编程小技巧。

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