json web token登录

1.引入jar包

2.jwt加密得到token,解密获取登录信息

<span style="font-size:18px;">package com.baosight.JWT.tool;

import java.text.ParseException;
import java.util.Map;

import net.minidev.json.JSONObject;

import com.nimbusds.jose.JOSEException;
import com.nimbusds.jose.JWSAlgorithm;
import com.nimbusds.jose.JWSHeader;
import com.nimbusds.jose.JWSObject;
import com.nimbusds.jose.JWSSigner;
import com.nimbusds.jose.Payload;
import com.nimbusds.jose.crypto.MACSigner;
import com.nimbusds.jwt.JWT;
import com.nimbusds.jwt.JWTParser;
import com.nimbusds.jwt.ReadOnlyJWTClaimsSet;
public  class AuthHelper {
	//可有无，随意设置的属性值
	static String BAOSIGHT_SHORTNAME = "test";
	//站点秘钥
	static String BAOSIGHT_SECRET = "3d990d2276917dfac04467df11fff26d";
	//加密，id </span><span style="font-size: 18px; font-family: Arial, Helvetica, sans-serif;">(用户在网站中的唯一标示),flag(是否记住密码一周)</span>

<span style="font-size:18px;"><span style="white-space:pre">	</span>public static String getToken(String id,String flag){
		JSONObject userInfo = new JSONObject();
        //网站二级域名
        userInfo.put("short_name", BAOSIGHT_SHORTNAME);//必须项
        //用户id(用户在网站中的唯一标示)
        //这里添加一个javabean对象，会出现类型异常
        userInfo.put("user_key", id);//必须项
        //flag设置到期时间
        userInfo.put("flag", flag);
        //用户名
        userInfo.put("name", "网站用户A");//可选项
        Payload payload = new Payload(userInfo);

        JWSHeader header = new JWSHeader(JWSAlgorithm.HS256);
        header.setContentType("jwt");

        // Create JWS object
        JWSObject jwsObject = new JWSObject(header, payload);

        // Create HMAC signer
        JWSSigner signer = new MACSigner(BAOSIGHT_SECRET.getBytes());

        try {
                jwsObject.sign(signer);

        } catch (JOSEException e) {

                System.err.println("Couldn't sign JWS object: " + e.getMessage());
                return "error";
        }
        // Serialise JWS object to compact format
        String token = jwsObject.serialize();
        return token;
	}

	public static String  parseToken(String token){
		 try {
				JWT t=JWTParser.parse(token);
				//获取Claims // 包括需要传递的用户信息； { "sub": "1234567890", "name": "John Doe", "admin": true }
				ReadOnlyJWTClaimsSet s=t.getJWTClaimsSet();
				Map<String, Object> map=s.getAllClaims();
//				userInfo userInfo=(com.baosight.JWT.bean.userInfo) map.get("user");
//				System.out.println(userInfo.getId()+userInfo.getFlag());
				String user_key=(String) map.get("user_key");
				String flag=(String) map.get("flag");
				System.out.println(flag);
				return user_key;
			} catch (ParseException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
				return null;
			}

	}</span>

<span style="font-size:18px;">//测试
	public static void main(String[] args) {
		String token =getToken("venbill","true");
		String user_key=parseToken(token);
		System.out.println(user_key);
//		System.out.println("id:"+u.getId()+", flag:"+u.getFlag());
	}

}</span>

3.登录：doLogin

<span style="font-size:18px;">package com.baosight.JWT.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.baosight.JWT.tool.AuthHelper;

/**
 * Servlet implementation class doLogin
 */
public class doLogin extends HttpServlet {
	private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public doLogin() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doPost(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String name=request.getParameter("name");
		String password=request.getParameter("password");
		String getFlag=request.getParameter("autoAuth");
		int durationDays=-1;
		String autoAuth="flase";
		if (getFlag!=null) {
			durationDays=7;
			autoAuth="true";
		}
		AuthHelper ah=new AuthHelper();
		String token=ah.getToken(name, autoAuth);
		System.out.println(token);</span>

<span style="font-size:18px;"><span style="white-space:pre">		</span>//存入cookie
		Cookie cookie = new Cookie("JWT-Test2", token);
		cookie.setPath("/");
		cookie.setMaxAge(durationDays*60*60*24);
		response.addCookie(cookie);
		Cookie[] cookies = request.getCookies();
        for(Cookie c :cookies ){
            System.out.println(c.getName()+"--->"+c.getValue());
        }
        response.sendRedirect("/JWT-Test2/success.jsp");
	}

}
</span>

<span style="font-size:18px;"><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>welcome to baosight</title>
</head>
<body>
	<table>
	<form action="http://localhost:8888/JWT-Test2/doLogin" method="POST">
		<tr><td>用户名:     <input type="text" name="name" /><br></td></tr>
		<tr><td>密    码: <input type="text" name="password" /><br></td>
</tr>
<tr>
				<td>	<input type="checkbox" name="autoAuth" value="true" />记住一周</td>

	<td>	<input type="submit" value="Submit" /></td></tr>
	</form>
	</table>
</body>
</html></span>

success.html

<span style="font-size:18px;"><%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>login success</h1>
	<form action="http://localhost:8888/JWT-Test2/doLogout" method="POST">

			<input type="submit" value="退出" />
	</form>
</body>
</html></span>

4.登出doLogout

<span style="font-size:18px;">package com.baosight.JWT.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class doLogout
 */
public class doLogout extends HttpServlet {
	private static final long serialVersionUID = 1L;

    public doLogout() {
        super();
    }

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doPost(request, response);
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//删除cookie</span>

<span style="font-size:18px;"><span style="white-space:pre">		</span>Cookie[] cookies = request.getCookies();
		if(cookies != null)
			for(Cookie cookie : cookies) {
				if(cookie.getName().equals("JWT-Test2")) {
					System.out.println("cookname========="+cookie.getName());</span>

<span style="font-size:18px;"><span style="white-space:pre">					</span>//这里必须设置path,不然删除不了，必要时需要设置path和domain
					cookie.setMaxAge(0);
					cookie.setPath("/");
					response.addCookie(cookie);
					break;
				}
			}
		request.getRequestDispatcher("/login.html").forward(request, response);

	}

}</span>

5.设置过滤器，每次访问页面拿取、判断token

<span style="font-size:18px;">package com.baosight.JWT.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.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.baosight.JWT.tool.AuthHelper;

/**
 * Servlet Filter implementation class AuthorTokenFilter
 */
public class AuthorTokenFilter implements Filter {

    /**
     * Default constructor.
     */
    public AuthorTokenFilter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse) resp;
		String token = null;
		Cookie[] cookies = request.getCookies();</span>

<span style="font-size:18px;"><span style="white-space:pre">		</span>//拿取cookie并判断
		if(cookies != null)
			for(Cookie cookie : cookies) {
				if(cookie.getName().equals("JWT-Test2")) {
					token=cookie.getValue();
					break;
				}
			}
		AuthHelper ah=new AuthHelper();
		try {
			String id=ah.parseToken(token);
			System.out.println(id);
			request.getRequestDispatcher("/success.jsp").forward(request, response);
		} catch (Exception e) {
			response.sendRedirect("/JWT-Test2/login.html");
		}
		chain.doFilter(request, response);
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}</span>

<span style="font-size:18px;"><?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>JWT-Test2</display-name>
  <servlet>
    <description></description>
    <display-name>doLoginServlet</display-name>
    <servlet-name>doLoginServlet</servlet-name>
    <servlet-class>com.baosight.JWT.servlet.doLogin</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>doLoginServlet</servlet-name>
    <url-pattern>/doLogin</url-pattern>
  </servlet-mapping>
  //过滤器配置，访问所有jsp页面都经过该过滤器</span>

<span style="font-size:18px;">  <filter>
    <display-name>AuthorTokenFilter</display-name>
    <filter-name>AuthorTokenFilter</filter-name>
    <filter-class>com.baosight.JWT.filter.AuthorTokenFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>AuthorTokenFilter</filter-name>
    <url-pattern>*.jsp</url-pattern>
  </filter-mapping>
  <servlet>
    <description></description>
    <display-name>doLogout</display-name>
    <servlet-name>doLogout</servlet-name>
    <servlet-class>com.baosight.JWT.servlet.doLogout</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>doLogout</servlet-name>
    <url-pattern>/doLogout</url-pattern>
  </servlet-mapping>
</web-app></span>

6.网页打开：http://localhost:8888/JWT-Test2/login.html