jwt例子

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.xt</groupId>
	<artifactId>tutorial</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>tutorial Maven Webapp</name>
	<url>http://maven.apache.org</url>
	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>3.8.1</version>
			<scope>test</scope>
		</dependency>

		<!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-core</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-beans</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<!-- https://mvnrepository.com/artifact/org.springframework/spring-context-support -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context-support</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-databind</artifactId>
			<version>${jackson.version}</version>
		</dependency>

		<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-core</artifactId>
			<version>${jackson.version}</version>
		</dependency>

		<dependency>
			<groupId>com.auth0</groupId>
			<artifactId>java-jwt</artifactId>
			<version>${java.jwt.version}</version>
		</dependency>

	</dependencies>

	<build>
		<finalName>tutorial</finalName>
		<!-- jetty:run -->
		<plugins>
			<plugin>
				<groupId>org.mortbay.jetty</groupId>
				<artifactId>jetty-maven-plugin</artifactId>
				<version>8.1.16.v20140903</version>
			</plugin>
		</plugins>
	</build>

	<properties>
		<spring.version>4.3.2.RELEASE</spring.version>
		<jackson.version>2.8.3</jackson.version>
		<java.jwt.version>2.2.0</java.jwt.version>
	</properties>
</project>

import java.util.HashMap;
import java.util.Map;

import com.auth0.jwt.JWTSigner;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.internal.com.fasterxml.jackson.databind.ObjectMapper;

public class JWT {

private static final String SECRET = "XX#$%()(#*!()!KL<><MQLMNQNQJQK sdfkjsdrow32234545fdf>?N<:{LWPW";

private static final String EXP = "exp";

private static final String PAYLOAD = "payload";

/**
 * get jwt String of object
 * @param object
 *            the POJO object
 * @param maxAge
 *            the milliseconds of life time
 * @return the jwt token
 */
public static <T> String sign(T object, long maxAge) {
	try {
		final JWTSigner signer = new JWTSigner(SECRET);
		final Map<String, Object> claims = new HashMap<String, Object>();
		ObjectMapper mapper = new ObjectMapper();
		String jsonString = mapper.writeValueAsString(object);
		claims.put(PAYLOAD, jsonString);
		claims.put(EXP, System.currentTimeMillis() + maxAge);
		return signer.sign(claims);
	} catch(Exception e) {
		return null;
	}
}


/**
 * get the object of jwt if not expired
 * @param jwt
 * @return POJO object
 */
public static<T> T unsign(String jwt, Class<T> classT) {
	final JWTVerifier verifier = new JWTVerifier(SECRET);
    try {
		final Map<String,Object> claims= verifier.verify(jwt);
		if (claims.containsKey(EXP) && claims.containsKey(PAYLOAD)) {
			long exp = (Long)claims.get(EXP);
			long currentTimeMillis = System.currentTimeMillis();
			if (exp > currentTimeMillis) {
				String json = (String)claims.get(PAYLOAD);
				ObjectMapper objectMapper = new ObjectMapper();
				return objectMapper.readValue(json, classT);
			}
		}
		return null;
	} catch (Exception e) {
		return null;
	}
}

}