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。