用java来实现单点登录大概有哪些种方法
答案:2 悬赏:40 手机版
解决时间 2021-03-01 17:56
- 提问者网友：抽煙菂渘情少年
- 2021-03-01 01:12
用java来实现单点登录大概有哪些种方法
最佳答案
- 五星知识达人网友：山有枢
- 2021-03-01 02:39
你这样入手，给你列出整个简单流程，你自己思考一下： 1）下载，配置 Tomcat。 2）写 JSP 与 Servlet ，调用 MySQL 或其他数据库。 3）在 Tomcat 部署你的应用程序。 4）在浏览器运行你的应用程序。 一个简单的测试系统，主要由两个页面组成就够...
全部回答
- 1楼网友：猎心人
- 2021-03-01 03:04
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;
import javax.servlet.http.httpservletresponse;
public class loginfilter implements filter {
private string logininfopath;
public void destroy() {
logininfopath = null;
}
public void dofilter(servletrequest sreq, servletresponse sresp,
filterchain chain) throws ioexception, servletexception {
httpservletrequest req = (httpservletrequest) sreq;
httpservletresponse resp = (httpservletresponse) sresp;
class logininfoclass = null;
logininfobase logininfo = null;
try {
logininfoclass = class.forname(logininfopath);
logininfo = (logininfobase) logininfoclass.newinstance();
} catch (classnotfoundexception e) {
e.printstacktrace();
} catch (instantiationexception e) {
e.printstacktrace();
} catch (illegalaccessexception e) {
e.printstacktrace();
}
logininfo.setreq(req);
logininfo.setresp(resp);
//session值为空
if(logininfo.issessionempty()){
if(logininfo.init()){
boolean loginresult = logininfo.dologin();
if(loginresult){
logininfo.savecookie();
}
}
}else{
if(logininfo.init()){
//另外一套系统已经退出
if("out".equals(logininfo.getloginstate())){
logininfo.dologout();
cookieutil.delcookie(resp, logininfobase.cookie_name);
}
}
}
chain.dofilter(sreq, sresp);
}
public void init(filterconfig config) throws servletexception {
this.logininfopath = config.getinitparameter("logininfopath");
}
public string getlogininfopath() {
return logininfopath;
}
public void setlogininfopath(string logininfopath) {
this.logininfopath = logininfopath;
}
}
logininfopath 在web.xml中配置指明logininfobase的子类的完整路径用来反射
logininfobase代码：
package com.yt.util;
import java.text.simpledateformat;
import java.util.date;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
public abstract class logininfobase {
public static final string separation = "-->";
public static final string date_format = "yyyy-mm-dd hh:mm:ss";
public static final long cookie_time = 1800000;
public static final string cookie_name = "logininfo";
public static final string cookie_path = "/";
protected httpservletrequest req;
protected httpservletresponse resp;
protected date sessiontime;
protected string username;
protected string userpass;
protected string loginstate;
public logininfobase() {
super();
}
public logininfobase(httpservletrequest req, httpservletresponse resp) {
super();
this.req = req;
this.resp = resp;
}
public logininfobase(string username, string pwd, date sessiontime) {
this.username = username;
this.userpass = pwd;
this.sessiontime = sessiontime;
}
abstract void dologout();
abstract boolean issessionempty();
abstract boolean dologin();
public httpservletrequest getreq() {
return req;
}
public void setreq(httpservletrequest req) {
this.req = req;
}
public httpservletresponse getresp() {
return resp;
}
public void setresp(httpservletresponse resp) {
this.resp = resp;
}
//初始化登录对象
protected boolean init(){
string logininfostr = cookieutil.getvalue(req, logininfobase.cookie_name);
if(logininfostr == null || "".equals(logininfostr)){
return false;
}
string[] infoarray = logininfostr.split(separation);
if(infoarray.length>3){
this.username = digestutil.getfrombase64(infoarray[0]);
this.userpass = digestutil.getfrombase64(infoarray[1]);
this.sessiontime = builddate(infoarray[2]);
this.loginstate = infoarray[3];
}
if(new date().gettime() - getsessiontime().gettime() > logininfo.cookie_time){
cookieutil.delcookie(resp, logininfo.cookie_name);
return false;
}
return true;
}
protected void savecookie(){
setsessiontime(new date());
setloginstate("in");
cookieutil.addcookie(resp, logininfo.cookie_name, tostring(), "/");
}
public void clearcookie(){
setusername("xx");
setuserpass("xx");
setsessiontime(new date());
setloginstate("out");
cookieutil.addcookie(resp, logininfo.cookie_name, tostring(), "/");
}
@override
public string tostring() {
return digestutil.getbase64(username)+separation+digestutil.getbase64(userpass)+separation+formatesessiontime()+separation+loginstate;
}
private string formatesessiontime(){
simpledateformat df = new simpledateformat(date_format);
string timestr =df.format(sessiontime);
return timestr;
}
private date builddate(string sessiontime) {
simpledateformat df = new simpledateformat(date_format);
date date = null;
try {
date = df.parse(sessiontime);
}catch (exception ex){
system.out.println(ex.getmessage());
}
return date;
}
public date getsessiontime() {
return sessiontime;
}
public void setsessiontime(date sessiontime) {
this.sessiontime = sessiontime;
}
public string getusername() {
return username;
}
public void setusername(string username) {
this.username = username;
}
public string getuserpass() {
return userpass;
}
public void setuserpass(string userpass) {
this.userpass = userpass;
}
public string getloginstate() {
return loginstate;
}
public void setloginstate(string loginstate) {
this.loginstate = loginstate;
}}
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