Dropwizard实现一个最简单的REST

DropWizard 

http://www.dropwizard.io/0.9.2/docs/getting-started.html

Jetty for HTTP

Jersey for REST

官方说法 capable of doing 30,000-50,000 requests per second

 

定义依赖

<dependencies>
    <dependency>
        <groupId>io.dropwizard</groupId>
        <artifactId>dropwizard-core</artifactId>
        <version>${dropwizard.version}</version>
    </dependency>
</dependencies>

 

实现

最核心的类Resource，定义路径和方法

import com.google.common.base.Optional;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.MediaType;

/**
 * Created by xuanzhui on 2016/3/21.
 */
@Path("/hello")
@Produces(MediaType.APPLICATION_JSON)
public class HelloWorldResource {
    @GET
    public String sayHello(@QueryParam("name") Optional<String> name) {
        return "Hello " + name.or("unknown");
    }
}

 

定义启动的类Application

import io.dropwizard.Application;
import io.dropwizard.Configuration;
import io.dropwizard.setup.Environment;

/**
 * Created by xuanzhui on 2016/3/21.
 */
public class HelloWorldApplication extends Application<Configuration> {
    public static void main(String[] args) throws Exception {
        new HelloWorldApplication().run(new String[] { "server" });
    }

    @Override
    public void run(Configuration configuration, Environment environment) throws Exception {
        environment.jersey().register(new HelloWorldResource());
    }
}

 

直接运行Application，即可通过 localhost:8080/hello 访问

 

打包

打包出一个jar，使其包含全部的依赖，最核心的是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>cn.xz</groupId>
    <artifactId>DropWizardSample</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <dropwizard.version>0.9.2</dropwizard.version>
        <jdk.version>1.8</jdk.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>io.dropwizard</groupId>
            <artifactId>dropwizard-core</artifactId>
            <version>${dropwizard.version}</version>
        </dependency>
    </dependencies>

    <build>
    <finalName>DropWizardSample</finalName>
    <plugins>
        <!-- Set a compiler level -->
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.5.1</version>
            <configuration>
                <source>${jdk.version}</source>
                <target>${jdk.version}</target>
            </configuration>
        </plugin>

        <!-- Maven Shade Plugin -->
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>2.4.3</version>
            <configuration>
                <createDependencyReducedPom>true</createDependencyReducedPom>
                <filters>
                    <filter>
                        <artifact>*:*</artifact>
                        <excludes>
                            <exclude>META-INF/*.SF</exclude>
                            <exclude>META-INF/*.DSA</exclude>
                            <exclude>META-INF/*.RSA</exclude>
                        </excludes>
                    </filter>
                </filters>
            </configuration>
            <executions>
                <!-- Run shade goal on package phase -->
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                    <configuration>
                        <transformers>
                            <!-- important for RS -->
                            <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
                            <!-- add Main-Class to manifest file -->
                            <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                <mainClass>cn.xz.HelloWorldApplication</mainClass>
                            </transformer>
                        </transformers>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
    </build>
</project>

 

通过maven package生成fat/uber jar

运行java -jar DropWizardSample.jar，即可通过 localhost:8080/hello 访问