简单实用一分钟上手级权限控制_spa 权限控制-优快云博客

本文介绍了一种简单的权限控制方法，通过自定义过滤器实现对特定URL的权限验证。具体包括检查登录状态、验证用户权限和处理未授权访问。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

简单实用一分钟上手级权限控制

用的是通过filter过滤来管理权限的方法，很简单，但也很实用。这个项目并不小，但这么一个类就已经可以满足其权限管理的需要了，所以其实很多时候，权限管理大家并不必要想得那么复杂，对于不少系统，简单通过filter来管理就ok了, simple 也是一种美^_^ 在web.xml里加入

view plain copy to clipboard print ?

<filter>
<filter-name>Authentication</filter-name>
<filter-class>com.springside.demo.security.UrlFilter</filter-class>
<init-param>
<param-name>onError</param-name>
<param-value>/login.jsp</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>Authentication</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>

view plain copy to clipboard print ?

public class UrlFilter implements Filter {
private FilterConfig filterConfig;
private FilterChain chain;
private HttpServletRequest request;
private HttpServletResponse response;
public void destroy() {
this.filterConfig = null;
}
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
}
public void doFilter(ServletRequest servletRequest,
ServletResponse servletResponse, FilterChain chain)
throws IOException, ServletException {
this.chain = chain;
this.request = (HttpServletRequest) servletRequest;
this.response = ((HttpServletResponse) servletResponse);
String url = request.getServletPath();
if (url == null)
url = "";
// 获取session中的loginuser对象
HttpSession session = request.getSession();
LoginUser loginuser = (LoginUser) session.getAttribute("loginuser");
if (baseUrl(url, request)) {
// 如果是登陆界面等无须权限访问的的公用界面则跳过
chain.doFilter(request, response);
} else if (loginuser == null) {
checkLogin(url);
} else {
verifyUrl(url, loginuser);
}
}
private void checkLogin(String url) throws ServletException, IOException {
// 如果session中获取不到 loginuser 对象，要不就是session 过期了，要不就是还没登陆。所以返回登陆界面
// 在登陆后记得把 loginuser 对象置于 session中
if (url.indexOf("/index.jsp") >= 0
&& "login".equals(request.getParameter("act"))) {
// 获取request中username,password
String username = request.getParameter("username");
String password = request.getParameter("password");
UserDao userDao = new UserDao();
if (userDao.authUser(username, password)) {
LoginUser user = userDao.getUser(username);
request.getSession().setAttribute("loginuser", user);
verifyUrl(url,user);
return;
}
}
response.sendRedirect("login.jsp");
}
private void verifyUrl(String url, LoginUser loginuser)
throws IOException, ServletException {
// 获取 loginuser 拥有的所有资源串
Set royurl = loginuser.getResStrings();
if (royurl != null && royurl.size() > 0 && pass(royurl, url, request.getParameterMap())) {
chain.doFilter(request, response);
} else {
response.setContentType("text/html;charset=GBK");
response
.getWriter()
.println(
"<div style='margin: 100 auto;text-align: center;"
+ "font: bold 18px 宋体;color: #0066CC;vertical-align: middle'> Sorry,您没有权限访问该资源!</div>");
}
}
/**
* 判断是否是公用界面
*/
protected boolean baseUrl(String url, HttpServletRequest request) {
if (url.indexOf("/login.jsp") >= 0) {
return true;
}
return false;
}
/**
* 判断该用户是否有权请求该url
*
* @param royurl
* user拥有的授权的的url串集合
* @param url
* 当前请求的url
* @param reqmap
* 当前request的参数
* @return 是否通过该url
*/
protected boolean pass(Set royurl, String url, Map reqmap) {
boolean match = true;
for (Iterator iter = royurl.iterator(); iter.hasNext();) {
// 获取资源
match = true;
String res_string = (String) iter.next();
if (res_string.indexOf("*") > 0) {
res_string = res_string.substring(0, res_string.indexOf("*"));
if (url.substring(0, res_string.length()).equalsIgnoreCase(
res_string)) {
return true; // 增加通配符比较
}
}
// 分割url与参数
String[] spw = res_string.split("//?"); // 用"//?" 转义后即可得到正确的结
if (!url.equalsIgnoreCase(spw[0])) {
match = false;
}
if (match && spw.length > 1) {
String[] spa = spw[1].split("//&"); // 分拆各参数
for (int j = 0; j < spa.length; j++) {
String[] spe = spa[j].split("="); // 分拆键与值
String key = spe[0];
String value = "";
if (spe.length > 1) {
value = spe[1].trim();
}
// 轮询
String[] values = (String[]) reqmap.get(key);
if (values != null) {
for (int k = 0; k < values.length; k++) {
if (value.equalsIgnoreCase(values[k])) {
match = true;
break;
}
match = false;
}
if (!match) {
break;
}
}
}
}
if (match) {
break;
}
}
return match;
}
public static void main(String[] args) {
UrlFilter filter = new UrlFilter();
String url = "/baseProd/product.do";
Map reqmap = new HashMap();
// 当前请求productline参数是11,12
reqmap.put("productline", new String[] { "11", "12" });
String str;
Set royurl = new HashSet();
// 和授权的的url根本不同，false
royurl.add("/user.do?a=1&b=2");
System.out.println("match false:" + filter.pass(royurl, url, reqmap));
// 授权的请求参数13,14时 false
royurl.add("/baseProd/product.do?productline=13&productline=14");
System.out.println("match false:" + filter.pass(royurl, url, reqmap));
// 授权的请求参数11,13时 false
royurl.add("/baseProd/product.do?productline=11&productline=13");
System.out.println("match false:" + filter.pass(royurl, url, reqmap));
// 授权的请求参数11时 true
royurl.add("/baseProd/product.do?productline=11");
System.out.println("match true:" + filter.pass(royurl, url, reqmap));
// 参数的不论顺序 true
royurl.add("/baseProd/product.do?productline=12&productline=11");
System.out.println("match true:" + filter.pass(royurl, url, reqmap));
royurl.clear();
// 支持 "*" 号作通配符 true
royurl.add("/baseProd/product.do*");
System.out.println("match ture:" + filter.pass(royurl, url, reqmap));
}
}

public class UrlFilter implements Filter {
private FilterConfig filterConfig;
private FilterChain chain;
private HttpServletRequest request;
private HttpServletResponse response;
public void destroy() {
this.filterConfig = null;
}
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
}
public void doFilter(ServletRequest servletRequest,
ServletResponse servletResponse, FilterChain chain)
throws IOException, ServletException {
this.chain = chain;
this.request = (HttpServletRequest) servletRequest;
this.response = ((HttpServletResponse) servletResponse);
String url = request.getServletPath();
if (url == null)
url = "";
// 获取session中的loginuser对象
HttpSession session = request.getSession();
LoginUser loginuser = (LoginUser) session.getAttribute("loginuser");
if (baseUrl(url, request)) {
// 如果是登陆界面等无须权限访问的的公用界面则跳过
chain.doFilter(request, response);
} else if (loginuser == null) {
checkLogin(url);
} else {
verifyUrl(url, loginuser);
}
}
private void checkLogin(String url) throws ServletException, IOException {
// 如果session中获取不到 loginuser 对象，要不就是session 过期了，要不就是还没登陆。所以返回登陆界面
// 在登陆后记得把 loginuser 对象置于 session中
if (url.indexOf("/index.jsp") >= 0
&& "login".equals(request.getParameter("act"))) {
// 获取request中username,password
String username = request.getParameter("username");
String password = request.getParameter("password");
UserDao userDao = new UserDao();
if (userDao.authUser(username, password)) {
LoginUser user = userDao.getUser(username);
request.getSession().setAttribute("loginuser", user);
verifyUrl(url,user);
return;
}
}
response.sendRedirect("login.jsp");
}
private void verifyUrl(String url, LoginUser loginuser)
throws IOException, ServletException {
// 获取 loginuser 拥有的所有资源串
Set royurl = loginuser.getResStrings();
if (royurl != null && royurl.size() > 0 && pass(royurl, url, request.getParameterMap())) {
chain.doFilter(request, response);
} else {
response.setContentType("text/html;charset=GBK");
response
.getWriter()
.println(
"<div style='margin: 100 auto;text-align: center;"
+ "font: bold 18px 宋体;color: #0066CC;vertical-align: middle'> Sorry,您没有权限访问该资源!</div>");
}
}
/**
* 判断是否是公用界面
*/
protected boolean baseUrl(String url, HttpServletRequest request) {
if (url.indexOf("/login.jsp") >= 0) {
return true;
}
return false;
}
/**
* 判断该用户是否有权请求该url
*
* @param royurl
*            user拥有的授权的的url串集合
* @param url
*            当前请求的url
* @param reqmap
*            当前request的参数
* @return 是否通过该url
*/
protected boolean pass(Set royurl, String url, Map reqmap) {
boolean match = true;
for (Iterator iter = royurl.iterator(); iter.hasNext();) {
// 获取资源
match = true;
String res_string = (String) iter.next();
if (res_string.indexOf("*") > 0) {
res_string = res_string.substring(0, res_string.indexOf("*"));
if (url.substring(0, res_string.length()).equalsIgnoreCase(
res_string)) {
return true; // 增加通配符比较
}
}
// 分割url与参数
String[] spw = res_string.split("//?"); // 用"//?" 转义后即可得到正确的结
if (!url.equalsIgnoreCase(spw[0])) {
match = false;
}
if (match && spw.length > 1) {
String[] spa = spw[1].split("//&"); // 分拆各参数
for (int j = 0; j < spa.length; j++) {
String[] spe = spa[j].split("="); // 分拆键与值
String key = spe[0];
String value = "";
if (spe.length > 1) {
value = spe[1].trim();
}
// 轮询
String[] values = (String[]) reqmap.get(key);
if (values != null) {
for (int k = 0; k < values.length; k++) {
if (value.equalsIgnoreCase(values[k])) {
match = true;
break;
}
match = false;
}
if (!match) {
break;
}
}
}
}
if (match) {
break;
}
}
return match;
}
public static void main(String[] args) {
UrlFilter filter = new UrlFilter();
String url = "/baseProd/product.do";
Map reqmap = new HashMap();
// 当前请求productline参数是11,12
reqmap.put("productline", new String[] { "11", "12" });
String str;
Set royurl = new HashSet();
// 和授权的的url根本不同，false
royurl.add("/user.do?a=1&b=2");
System.out.println("match false:" + filter.pass(royurl, url, reqmap));
// 授权的请求参数13,14时 false
royurl.add("/baseProd/product.do?productline=13&productline=14");
System.out.println("match false:" + filter.pass(royurl, url, reqmap));
// 授权的请求参数11,13时 false
royurl.add("/baseProd/product.do?productline=11&productline=13");
System.out.println("match false:" + filter.pass(royurl, url, reqmap));
// 授权的请求参数11时 true
royurl.add("/baseProd/product.do?productline=11");
System.out.println("match true:" + filter.pass(royurl, url, reqmap));
// 参数的不论顺序 true
royurl.add("/baseProd/product.do?productline=12&productline=11");
System.out.println("match true:" + filter.pass(royurl, url, reqmap));
royurl.clear();
// 支持 "*" 号作通配符 true
royurl.add("/baseProd/product.do*");
System.out.println("match ture:" + filter.pass(royurl, url, reqmap));
}
}

LoginUser 类:

view plain copy to clipboard print ?

public class LoginUser {
private String name;
//用户的授权url集合,如"/product.do?line=1&singer=2","/menu.do?son=1&son=2&son=3","/job.do*"
private Set resStrings;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Set getResStrings() {
return resStrings;
}
public void setResStrings(Set resStrings) {
this.resStrings = resStrings;
}
}