编辑特别推荐:
种方式：利用filter、xml文件和用户信息表配合使用来实现权限管理。
1.过滤器filter
package cn.com.aaa.bbb.filter;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import cn.com.aaa.bbb.domain.User;
import cn.com.aaa.bbb.util.HttpUtils;
/**
* 过滤：后台管理的模块授权。根据：配置文件xml，根据当前session中用的管理员信息。
* 注：不用再访问数据库。也不需要再使用什么 bean 去判断。直接在这个类里就可以判断。
* @author cuiguangqiang
*
*/
public class ManagerAuthFilter implements Filter {
protected static final Log logger = LogFactory.getLog(ManagerAuthFilter.class);
public static final String MAPPING_FILE = "/WEB-INF/managerauthmapping.xml";
private ServletContext context = null;
private Map actions = new HashMap();
public void init(FilterConfig filterConfig) throws ServletException {
context = filterConfig.getServletContext();
if(context==null){
logger.error("unable to init as servlet context is null");
return;
}
loadConf();
logger.info("ManagerAuthFilter configure success.");
}
private void loadConf() {
InputStream inputStream = context.getResourceAsStream(MAPPING_FILE);
if (inputStream == null) {
logger.info("unable find auth mapping file " + MAPPING_FILE);
} else {
actions = parseConf(inputStream);
}
}
private Map parseConf(InputStream inputStream) {
try {
SAXReader reader = new SAXReader();
Document document = reader.read(inputStream);
return createActionMap(document);
} catch (Exception e) {
logger.info(e.getMessage());
e.printStackTrace();
}
return new HashMap();
}
private Map createActionMap(Document document) {
Map map = new HashMap();
Element root = document.getRootElement();
//处理XML，读入JAVA Object对象中。
List actionList = root.elements();
for (Iterator it = actionList.iterator(); it.hasNext();) {
Element e = (Element) it.next();
String actionName = e.attributeValue("name");
String auth_value = e.element("auth-value").getTextTrim();
map.put(actionName,auth_value);
logger.info(actionName + " is " + auth_value);
}
return map;
}
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
//处理某次提交的Action，是否在权限定义范围内
//权限共有：1:站长；2:编辑；0:Admin ; all 代表所有人都可以。(均需要登录)
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse resp = (HttpServletResponse) response;
//(１)得到此次用户的提交请求
String url = req.getServletPath();
//(２)只有在配置文件中存在的 action 才进行处理
String method = req.getParameter("method");
if(method!=null){
url = url + "?method=" + method;
}
String auth_value = (String)actions.get(url);
if(auth_value==null){
logger.info("action is not in Manager Auth xml.");
chain.doFilter(request, response);
return;
}
来源:考试大-Java认证
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