Java 微服务之 jersey

问题：

简单实现 javase app 提供RESTful 服务

解决：

使用jersey 可以实现RESTful 服务

http服务程序有jetty / netty /jdk simple http server 多种选择

按下列代码创建好项目编译后当作普通的 java 程序启动就能调用RESTful 服务了

示例RESTful代码的网址为 http://localhost:6666/product/1

代码：

maven pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>me.yek</groupId>
    <artifactId>jersey1</artifactId>
    <version>1.0.0</version>
    <packaging>jar</packaging>
    <dependencies>
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-jdk-http</artifactId>
            <version>2.25.1</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.hamcrest</groupId>
            <artifactId>hamcrest-core</artifactId>
            <version>1.3</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-json-jackson</artifactId>
            <version>2.25.1</version>
        </dependency>
    </dependencies>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
</project>

<?xml version="1.0" encoding="UTF-8"?>

<artifactId>jersey1</artifactId>

<groupId>org.glassfish.jersey.containers</groupId>

<artifactId>jersey-container-jdk-http</artifactId>

</dependency>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

</dependency>

<groupId>org.hamcrest</groupId>

<artifactId>hamcrest-core</artifactId>

</dependency>

<groupId>org.glassfish.jersey.media</groupId>

<artifactId>jersey-media-json-jackson</artifactId>

</dependency>

</dependencies>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

<maven.compiler.source>1.8</maven.compiler.source>

<maven.compiler.target>1.8</maven.compiler.target>

</properties>

</project>

启动代码 App1.java

import com.sun.net.httpserver.HttpServer;
import java.net.URI;
import javax.ws.rs.core.UriBuilder;
import org.glassfish.jersey.jdkhttp.JdkHttpServerFactory;
import org.glassfish.jersey.server.ResourceConfig;

/**
 *
 * @author Administrator
 */
public class App1 {

    public static void main(String[] argv) {
        URI uri = UriBuilder.fromUri("http://localhost/").port(6666).build();
        ResourceConfig cfg = ResourceConfig.forApplication(new Resource());
        HttpServer s = JdkHttpServerFactory.createHttpServer(uri, cfg);
        //did start s.start();
        //Server s = JettyHttpContainerFactory.createServer(baseUri, config);
        System.out.println("end");
    }
}

import com.sun.net.httpserver.HttpServer;

import java.net.URI;

import javax.ws.rs.core.UriBuilder;

import org.glassfish.jersey.jdkhttp.JdkHttpServerFactory;

import org.glassfish.jersey.server.ResourceConfig;

/**

* @author Administrator

public class App1 {

public static void main(String[] argv) {

URI uri = UriBuilder.fromUri("http://localhost/").port(6666).build();

ResourceConfig cfg = ResourceConfig.forApplication(new Resource());

HttpServer s = JdkHttpServerFactory.createHttpServer(uri, cfg);

//did start s.start();

//Server s = JettyHttpContainerFactory.createServer(baseUri, config);

System.out.println("end");

}

Resource.java

import java.util.HashSet;
import java.util.Set;
import javax.ws.rs.core.Application;

/**
 *
 * @author Administrator
 */
public class Resource extends Application {
    
    @Override
    public Set<Class<?>> getClasses() {
        Set<Class<?>> ret = new HashSet<>();
        ret.add(ProductFacade.class);        
        return ret;
    }
    
}

import java.util.HashSet;

import java.util.Set;

import javax.ws.rs.core.Application;

/**

* @author Administrator

public class Resource extends Application {

@Override

public Set<Class<?>> getClasses() {

Set<Class<?>> ret = new HashSet<>();

ret.add(ProductFacade.class);

return ret;

}

服务提供代码ProductFacade.java：

import java.util.HashMap;
import java.util.Map;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;

/**
 *
 * @author Administrator
 */
@Path("product")
public class ProductFacade {

    @GET
    @Path("{id}")
    @Produces("application/json")
    public Map<String, Object> getProduct(@PathParam("id") final int id) {
        Map<String, Object> ret = new HashMap<>();
        ret.put("title", "范德萨发；了的萨芬 " + id);
        ret.put("id", id);
        return ret;
    }
}

import java.util.HashMap;

import java.util.Map;

import javax.ws.rs.GET;

import javax.ws.rs.Path;

import javax.ws.rs.PathParam;

import javax.ws.rs.Produces;

/**

* @author Administrator

@Path("product")

public class ProductFacade {

@GET

@Path("{id}")

@Produces("application/json")

public Map<String, Object> getProduct(@PathParam("id") final int id) {

Map<String, Object> ret = new HashMap<>();

ret.put("title", "范德萨发；了的萨芬 " + id);

ret.put("id", id);

return ret;

}

参考：

https://jersey.java.net/documentation/latest/deployment.html#deployment.javase

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Java 微服务之 jersey

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