SSO单点登陆基于Session简单实现
单点登陆活动图
单点登陆活动图
废话不多说直接上代码咯，什么好处，实现原理相关资料baidu去，基本都一样，就不复制了
1 服务端代码
1.1 登陆跳转注销代码
controller层代码
package com.ffcs.sso.controller;
import javax.servlet.http.HttpSession;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import com.ffcs.sso.pojo.User;
import com.ffcs.sso.service.LogoutManagerService;
import com.ffcs.sso.service.TicketManagerService;
import com.ffcs.sso.service.UserManagerService;
import com.ffcs.sso.utils.Constant;
/**
*
* @author damon
*
*/
@Controller
public class SSOController {
private final static Logger LOGGER=LoggerFactory.getLogger(SSOController.class);
@Autowired
private TicketManagerService ticketManagerService;
@Autowired
private UserManagerService userManagerService;
@Autowired
private LogoutManagerService logoutManagerService;
/**
* 主页
* @return
*/
@RequestMapping(value="manager/index",method=RequestMethod.GET)
public String index(){
return "index";
}
/**
* 登陆首页
* @return
*/
@RequestMapping(value="login",method=RequestMethod.GET)
public ModelAndView loginIndex(String queryParams,String targetUrl,ModelAndView modelAndView){
modelAndView.addObject("queryParams", queryParams);
modelAndView.addObject("targetUrl", targetUrl);
modelAndView.setViewName("login");
return modelAndView;
}
@RequestMapping(value="login",method=RequestMethod.POST)
public String login(@RequestParam(required = true) String account, @RequestParam(required = true) String password,
String targetUrl, String queryParams, Model model, HttpSession session) {
User user = userManagerService.getUserInfo(account, password);
if (user != null) {
String homeCookieId = session.getId();
session.setAttribute(Constant.SSO_IS_LOGIN, true);
session.setAttribute(Constant.SSO_LOGIG_INFO, account);
logoutManagerService.saveLoginUserInfo(homeCookieId, user);
if (StringUtils.isNotBlank(targetUrl)) {
// 生成targetURL对应的票
String ticket = ticketManagerService.generateTicket(targetUrl, homeCookieId);
String params = StringUtils.isNotBlank(queryParams) ? "&" + queryParams : "";
LOGGER.info("################### 用户账号:[{}] 对应主站cookieId:[{}] 登陆系统 :[{}]", account, homeCookieId, targetUrl);
return "redirect:" + targetUrl + "?" + Constant.SSO_TICKET + "=" + ticket + params;
}
return "redirect:manager/index";
} else {
model.addAttribute("error", "用户名或密码错误！");
if (StringUtils.isNotBlank(targetUrl)) {
model.addAttribute("targetUrl", targetUrl);
}
return "login";
}
}
/**
* 重定向到子系统并生成票
* @param targetUrl
* @param queryParams
* @param modelAndView
* @param session
* @return
*/
@RequestMapping(value="redirect",method=RequestMethod.GET)
public ModelAndView redirect(@RequestParam(value="targetUrl",required=true)String targetUrl,
String queryParams,ModelAndView modelAndView,HttpSession session) {
if(session.getAttribute(Constant.SSO_IS_LOGIN)==null){
modelAndView.setViewName("redirect:login");
modelAndView.addObject("targetUrl", targetUrl);
modelAndView.addObject("queryParams", queryParams);
//重定向到login方法，带上目标网页地址
}else{
String homeCookieId=session.getId();
String account=(String) session.getAttribute(Constant.SSO_LOGIG_INFO);
//生成targetURL对应的票
String ticket=ticketManagerService.generateTicket(targetUrl,homeCookieId);
String params=StringUtils.isNotBlank(queryParams)?"&"+queryParams:"";
modelAndView.setViewName("redirect:" + targetUrl + "?" + Constant.SSO_TICKET + "=" + ticket + params);
LOGGER.info("############### 用户账号:[{}] 主站cookieId:[{}] 重定向到系统:[{}] 对应ticket:[{}]", account, homeCookieId, targetUrl, ticket);
}
return modelAndView;
}
/**
* 单点注销
* @param session
* @return
*/
@RequestMapping(value="logout",method=RequestMethod.GET)
public String logout(HttpSession session){
if(session.getAttribute(Constant.SSO_IS_LOGIN)!=null){
String cookieId=session.getId();
String account=(String) session.getAttribute(Constant.SSO_LOGIG_INFO);
logoutManagerService.logout(cookieId);
session.invalidate();
LOGGER.info("########### 单点退出用户账号:[{}] 对应主站cookieId为:[{}] ",account,cookieId);
}
return "redirect:login";
}
}
1.2 生成票管理接口代码（对外restful webservice发布）
package com.ffcs.sso.service;
import java.util.UUID;
import net.rubyeye.xmemcached.MemcachedClient;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;
import com.ffcs.sso.exception.SSOException;
import com.ffcs.sso.pojo.TicketInfo;
import com.ffcs.sso.pojo.TicketResponseInfo;
import com.ffcs.sso.pojo.User;
import com.ffcs.sso.utils.Constant;
/**
*
* 票管理
*
*
* damon
*
*/
@Service
public class TicketManagerServiceImpl implements TicketManagerService{
@Autowired
@Qualifier(value="memcachedSSOClient")
private MemcachedClient memcachedClient;
@Autowired
private LogoutManagerService logoutManagerService;
@Override
public String generateTicket(String target,String homeCookieId){
if(StringUtils.isBlank(target)){
throw new IllegalArgumentException("target不可以为空！");
}
if(StringUtils.isBlank(homeCookieId)){
throw new IllegalArgumentException("homeCookieId不可以为空！");
}
String ticket=UUID.randomUUID().toString();
try {
memcachedClient.set(ticket, Constant.MAX_TICKET_INACTIVE_INTERVAL, new TicketInfo(ticket,target,homeCookieId));
return ticket;
} catch (Exception e) {
throw new SSOException(e);
}
}
@Override
public TicketResponseInfo validateTicket(String ticket,String target,
String subCookieId,String subCookieName,String subLogoutPath){
if(StringUtils.isBlank(ticket)){
throw new IllegalArgumentException("ticket不可以为空！");
}
if(StringUtils.isBlank(target)){
throw new IllegalArgumentException("target不可以为空！");
}
if(StringUtils.isBlank(subCookieId)){
throw new IllegalArgumentException("subCookieId不可以为空！");
}
if(StringUtils.isBlank(subCookieName)){
throw new IllegalArgumentException("subCookieName不可以为空！");
}
if(StringUtils.isBlank(subLogoutPath)){
throw new IllegalArgumentException("subLogoutPath不可以为空！");
}
try {
TicketInfo ticketInfo = memcachedClient.get(ticket);
if(ticketInfo==null||!target.equals(ticketInfo.getTargetUrl())){
//返回空验证不通过
return new TicketResponseInfo(false);
}
//删除票保存的临时信息
memcachedClient.delete(ticket);
String homeCookieId=ticketInfo.getHomeCookieId();
//验证后保存登出信息（原本验证和登出信息分开提交，一并提交减少访问次数）
logoutManagerService.saveSubWebsiteLogouInfo(homeCookieId, subLogoutPath, subCookieId, subCookieName);
User user= logoutManagerService.getLoginUserInfo(homeCookieId);
return new TicketResponseInfo(true,user.getAccount(),homeCookieId);
} catch (Exception e) {
throw new SSOException(e);
}
}
}
1.3 单点退出接口（对外restful webservice发布）
package com.ffcs.sso.service;
import java.util.Set;
import net.rubyeye.xmemcached.MemcachedClient;
import org.apache.commons.lang.StringUtils;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;
import com.ffcs.sso.exception.SSOException;
import com.ffcs.sso.pojo.ActivationInfo;
import com.ffcs.sso.pojo.LogoutInfo;
import com.ffcs.sso.pojo.User;
import com.ffcs.sso.utils.Constant;
/**
* 单点退出
*
* damon
*/
@Service
public class LogoutManagerServiceImpl implements LogoutManagerService {
private static final Logger LOGGER=LoggerFactory.getLogger(LogoutManagerServiceImpl.class);
private final String LOGOUT_PREFIX="LOGOUT_";
@Autowired
@Qualifier("memcachedSSOClient")
private MemcachedClient memcachedClient;
@Autowired
private HttpClient httpClient;
@Override
public boolean saveSubWebsiteLogouInfo(String homeCookieId, String logoutPath,String subCookieId,String subCookieName) {
if(StringUtils.isBlank(homeCookieId)){
throw new IllegalArgumentException("homeCookieId 不可以为空！");
}
if(StringUtils.isBlank(logoutPath)){
throw new IllegalArgumentException("logoutPath 不可以为空！");
}
if(StringUtils.isBlank(subCookieId)){
throw new IllegalArgumentException("subWebSite 不可以为空！");
}
ActivationInfo info=null;
Set<logoutinfo> logoutInfos=null; /<logoutinfo>
try {
info=memcachedClient.get(LOGOUT_PREFIX + homeCookieId);
if(info==null){
info=new ActivationInfo();
}
logoutInfos=info.getLogoutInfo();
logoutInfos.add(new LogoutInfo(logoutPath,subCookieId,subCookieName));
info.setLogoutInfo(logoutInfos);
memcachedClient.set(LOGOUT_PREFIX + homeCookieId, Constant.MAX_USERINFO_INACTIVE_INTERVAL, info);
LOGGER.debug("############### 保存子站登出信息 ,子站登出地址 url:{}, 子站cookie:{}, 主站cookie:{}", logoutPath, subCookieId, homeCookieId);
return true;
} catch (Exception e) {
throw new SSOException(e);
}
}
@Override
public void logout(String homeCookieId) {
if(StringUtils.isBlank(homeCookieId)){
throw new IllegalArgumentException("cookieId 不可以为空！");
}
ActivationInfo info=null;
Set<logoutinfo> logoutInfos=null; /<logoutinfo>
try {
info = memcachedClient.get(LOGOUT_PREFIX+homeCookieId);
memcachedClient.delete(LOGOUT_PREFIX+homeCookieId);
if(info==null|| (logoutInfos=info.getLogoutInfo())==null){
LOGGER.debug("############## 用户 cookieId:[{}] 未登陆任何系统 ！",homeCookieId);
return;
}
} catch (Exception e) {
LOGGER.error("############### Memcached获取单点登出信息失败", e);
return;
}
for (LogoutInfo logoutInfo:logoutInfos) {
HttpPost post=null;
try {
post = new HttpPost(logoutInfo.getLogoutPath());
post.setHeader("charset", "UTF-8");
post.setHeader("Connection", "close");
//添加cookie模拟回调时候子系统能找到session
post.setHeader("Cookie",logoutInfo.getSubCookieName()+"="+logoutInfo.getSubCookieId());
HttpResponse response = httpClient.execute(post);
LOGGER.debug("########## 登出子站 :[{}] 主站cookie:[{}] 子站cookie:[{}] 登出返回状态码:[{}] ",
logoutInfo.getLogoutPath(), homeCookieId, logoutInfo.getSubCookieId(), response.getStatusLine().getStatusCode());
} catch (Exception e) {
LOGGER.error("########## 注销子系统失败,子系统信息:{}",logoutInfo.toString(),e);
} finally {
if(post!=null){
post.releaseConnection();
}
}
}
}
@Override
public void saveLoginUserInfo(String homeCookieId,User userInfo){
try {
ActivationInfo info=memcachedClient.get(LOGOUT_PREFIX+homeCookieId);
if(info==null){
info=new ActivationInfo();
}
info.setUserInfo(userInfo);
memcachedClient.set(LOGOUT_PREFIX+homeCookieId, Constant.MAX_USERINFO_INACTIVE_INTERVAL, info);
} catch (Exception e) {
throw new SSOException("############# 保存用户登陆信息失败 ",e);
}
}
@Override
public User getLoginUserInfo(String homeCookieId){
ActivationInfo info = null;
try {
info=memcachedClient.get(LOGOUT_PREFIX+homeCookieId);
if(info!=null){
return info.getUserInfo();
}
throw new RuntimeException("找不到该cookie:["+homeCookieId+"]的用户信息");
} catch (Exception e) {
throw new SSOException("############# 获取登陆用户信息失败 ####",e);
}
}
@Override
public boolean updateUserInfoTimeout(String homeCookieId) {
if(StringUtils.isBlank(homeCookieId)){
throw new IllegalArgumentException("homeCookieId 不可以为空！");
}
try {
return memcachedClient.touch(LOGOUT_PREFIX+homeCookieId, Constant.MAX_USERINFO_INACTIVE_INTERVAL);
} catch (Exception e) {
LOGGER.error("############ 定时更新主站登陆用户信息失败 ",e);
}
return false;
}
}
2 客户端代码
2.1 过滤器代码
package com.ffcs.sso.filter;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.commons.lang.StringUtils;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPut;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.ffcs.sso.exception.HttpRequestException;
import com.ffcs.sso.pojo.TicketResponseInfo;
import com.ffcs.sso.utils.Constant;
import com.ffcs.sso.utils.HttpClientUtils;
import com.ffcs.sso.utils.JsonUtil;
public class SSOFilter implements Filter {
private final static Logger LOGGER=LoggerFactory.getLogger(SSOFilter.class);
private String ticketValidateURL;
private String redirectLoginURL;
private String updateUserInfoTimeOutURL;
@Override
public void destroy() {
}
@Override
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
HttpSession session=request.getSession();
if(session.getAttribute(Constant.SSO_IS_LOGIN)==null){
String targetUrl = request.getRequestURL().toString();
String ticket = request.getParameter(Constant.SSO_TICKET);
//子站单点退出路径
String subLogoutPath = request.getScheme()+"://"+request.getServerName()+":"
+request.getServerPort()+ request.getContextPath() +"/"+Constant.SSO_LOGOUT_SUFFIX;
TicketResponseInfo responseInfo=new TicketResponseInfo(false);
if(StringUtils.isNotBlank(ticket)){
//校验票如果校验通过同时保存子站的登出信息(减少提交次数，原本验证成功后在提交登出信息),并返回主站的cookieId和主站登陆的账号
responseInfo=validateTicketInfo(ticket,targetUrl,Constant.SSO_SUB_COOKIE_NAME,session.getId(),subLogoutPath);
}
if(!responseInfo.isSuccess()){
String queryParams =this.getQureyParams(request);
String params=StringUtils.isNotBlank(queryParams)?"&queryParams="+URLEncoder.encode(queryParams,"UTF-8"):"";
//重定向到主站判断系统是否登陆过
response.sendRedirect(redirectLoginURL + "?targetUrl=" + targetUrl + params);
LOGGER.debug("############## 重定向到主系统：" + redirectLoginURL + "?targetUrl=" + targetUrl + params);
return;
}
session.setAttribute(Constant.SSO_IS_LOGIN, true);
session.setAttribute(Constant.SSO_ACCOUNT, responseInfo.getAccount());
session.setAttribute(Constant.SSO_HOME_COOKIEID, responseInfo.getHomeCookieId());
}
Long updateInterval = (System.currentTimeMillis() - session.getLastAccessedTime()) / 1000;
if( updateInterval > Constant.SSO_HOME_USERINFO_UPDATE_TIMEOUT){
//更新主站用户信息超时时间
updateUserInfoTimeOut((String)session.getAttribute(Constant.SSO_HOME_COOKIEID));
LOGGER.debug("############## 更新主站用户信息超时时间,间隔{}秒 ########",Constant.SSO_HOME_USERINFO_UPDATE_TIMEOUT);
}
chain.doFilter(request, response);
return;
}
private String getQureyParams(HttpServletRequest request) {
StringBuilder queryParams=new StringBuilder();
Map<string> map=request.getParameterMap(); /<string>
Iterator<entry>> params=map.entrySet().iterator(); /<entry>
boolean tag=false;
while (params.hasNext()) {
Map.Entry<string> entry = params.next(); /<string>
if(!entry.getKey().equals(Constant.SSO_TICKET)){
String[] values=entry.getValue();
for(String value:values){
if(tag){
queryParams.append("&");
}
queryParams.append(entry.getKey()).append("=").append(value);
}
tag=true;
}
}
return queryParams.toString();
}
private void updateUserInfoTimeOut(String homeCookieId){
HttpPut put=new HttpPut(updateUserInfoTimeOutURL);
//添加cookie主站那边能够找到session
put.setHeader("Cookie",Constant.SSO_HOME_COOKIE_NAME+"="+homeCookieId);
put.setHeader("accept", "text/plain; charset=UTF-8");
try {
HttpClientUtils.getResponse(put);
} catch (HttpRequestException e) {
LOGGER.error("###################### 定时更新主站用户信息失败 ",e);
}
}
/**
* 根据ticket验证是否正确，验证通过返回主站的cookieId
*
* @param ticket
*
* @param target
*
* @return 返回验证空失败 成功cookieId
*/
private TicketResponseInfo validateTicketInfo(String ticket, String target,String subCookieName,
String subCookieId, String subLogoutPath) {
HttpGet httpget = new HttpGet(ticketValidateURL + "/"+ ticket + "?target=" + target
+"&subCookieId="+subCookieId+"&subCookieName="+subCookieName+"&subLogoutPath="+subLogoutPath);
httpget.setHeader("accept", "application/json; charset=UTF-8");
String result;
try {
result = HttpClientUtils.getResponse(httpget);
return JsonUtil.fromJson(result, TicketResponseInfo.class);
} catch (HttpRequestException e) {
throw new RuntimeException("############### 子站验证ticket失败 ",e);
}
}
@Override
public void init(FilterConfig filterConfig) {
if (filterConfig != null) {
LOGGER.info("####### SSOFilter:Initializing filter");
}
this.ticketValidateURL = filterConfig.getInitParameter("ticketValidateURL");
this.redirectLoginURL=filterConfig.getInitParameter("redirectLoginURL");
this.updateUserInfoTimeOutURL=filterConfig.getInitParameter("updateUserInfoTimeOutURL");
}
}
2.2 登出过滤器代码
比较简单，服务端通过httpclient回调这个路口进行退出，服务端必须把客户端登陆的cookie返回过来，不然找不到session
package com.ffcs.sso.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
public class LogoutFilter implements Filter{
@Override
public void destroy() {
}
@Override
public void doFilter(ServletRequest req, ServletResponse res,FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
request.getSession().invalidate();
return;
}
@Override
public void init(FilterConfig filterConfig) {
}
}
2.3 客户端web.xml配置
<web-app>
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<filter> /<filter>
<filter-name>DisableUrlSessionFilter/<filter-name>
<filter-class>com.ffcs.sso.filter.DisableUrlSessionFilter/<filter-class>
<filter-mapping> /<filter-mapping>
<filter-name>DisableUrlSessionFilter/<filter-name>
<url-pattern>/*/<url-pattern>
<filter> /<filter>
<filter-name>sessionFilter/<filter-name>
<filter-class>org.springframework.web.filter.DelegatingFilterProxy/<filter-class>
<filter-mapping> /<filter-mapping>
<filter-name>sessionFilter/<filter-name>
<url-pattern>/*/<url-pattern>
<filter> /<filter>
<filter-name>LogoutFilter/<filter-name>
<filter-class>com.ffcs.sso.filter.LogoutFilter/<filter-class>
<filter-mapping> /<filter-mapping>
<filter-name>LogoutFilter/<filter-name>
<url-pattern>/SSO_LOGOUT/<url-pattern>
<listener> /<listener>
<description>spring监听器/<description>
<listener-class>org.springframework.web.context.ContextLoaderListener/<listener-class>
<listener> /<listener>
<listener-class>org.springframework.web.util.IntrospectorCleanupListener/<listener-class>
<context-param> /<context-param>
<param-name>contextConfigLocation/<param-name>
<param-value>classpath:spring.xml/<param-value>
<filter> /<filter>
<description>字符集过滤器/<description>
<filter-name>encodingFilter/<filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter/<filter-class>
<init-param> /<init-param>
<description>字符集编码/<description>
<param-name>encoding/<param-name>
<param-value>UTF-8/<param-value>
<filter-mapping> /<filter-mapping>
<filter-name>encodingFilter/<filter-name>
<url-pattern>/*/<url-pattern>
<filter> /<filter>
<filter-name>SSOFilter/<filter-name>
<filter-class>com.ffcs.sso.filter.SSOFilter/<filter-class>
<init-param> /<init-param>
<param-name>ticketValidateURL/<param-name>
<param-value>http://127.0.0.1:8080/SSO/webservice/ticket/<param-value>
<init-param> /<init-param>
<param-name>updateUserInfoTimeOutURL/<param-name>
<param-value>http://127.0.0.1:8080/SSO/webservice/userinfo/timeout/<param-value>
<init-param> /<init-param>
<param-name>redirectLoginURL/<param-name>
<param-value>http://127.0.0.1:8080/SSO/redirect/<param-value>
<filter-mapping> /<filter-mapping>
<filter-name>SSOFilter/<filter-name>
<url-pattern>/*/<url-pattern>
<servlet> /<servlet>
<servlet-name>springMvc/<servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet/<servlet-class>
<init-param> /<init-param>
<param-name>contextConfigLocation/<param-name>
<param-value>classpath:spring-mvc.xml/<param-value>
<servlet-mapping> /<servlet-mapping>
<servlet-name>springMvc/<servlet-name>
<url-pattern>//<url-pattern>
<filter> /<filter>
<filter-name>HiddenHttpMethodFilter/<filter-name>
<filter-class>org.springframework.web.filter.HiddenHttpMethodFilter/<filter-class>
<filter-mapping> /<filter-mapping>
<filter-name>HiddenHttpMethodFilter/<filter-name>
<servlet-name>springMvc/<servlet-name>
<error-page> /<error-page>
<error-code>404/<error-code>
<location>/error/404.jsp/<location>
<error-page> /<error-page>
<error-code>500/<error-code>
<location>/error/500.jsp/<location>
/<web-app>
<servlet-mapping> /<servlet-mapping>
<servlet-name>springMvc/<servlet-name>
<url-pattern>//<url-pattern>
<filter> /<filter>
<filter-name>HiddenHttpMethodFilter/<filter-name>
<filter-class>org.springframework.web.filter.HiddenHttpMethodFilter/<filter-class>
<filter-mapping> /<filter-mapping>
<filter-name>HiddenHttpMethodFilter/<filter-name>
<servlet-name>springMvc/<servlet-name>
<error-page> /<error-page>
<error-code>404/<error-code>
<location>/error/404.jsp/<location>
<error-page> /<error-page>
<error-code>500/<error-code>
<location>/error/500.jsp/<location>
CSDN：https://blog.csdn.net/Sadlay/article/details/100041408
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