web基础----->jersey整合jetty开发restful应用（一）

　　这里介绍一个jersey与jetty整合开发restful应用的知识。将过去和羁绊全部丢弃，不要吝惜那为了梦想流下的泪水。

jersey与jetty的整合

一、创建一个maven项目，pom.xml的内容如下

<?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>com.linux.huhx</groupId>
    <artifactId>SpringLearn2</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <jetty-version>8.1.19.v20160209</jetty-version>
    </properties>

    <dependencies>
        <!-- jersey的依赖 -->
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-servlet</artifactId>
            <version>1.19.4</version>
        </dependency>

        <!-- jetty的依赖-->
        <dependency>
            <groupId>org.eclipse.jetty.aggregate</groupId>
            <artifactId>jetty-all-server</artifactId>
            <version>${jetty-version}</version>
        </dependency>

        <!-- 对返回json串的支持 -->
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-json</artifactId>
            <version>1.19.4</version>
        </dependency>

        <!-- junit 测试框架 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

</project>

二、创建一个web容器，在main方法启动jetty

package com.linux.huhx.main;

import com.sun.jersey.spi.container.servlet.ServletContainer;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHolder;

public class HttpServer {
    public static void main(String[] args) throws Exception {
        Server server = new Server(8090);
        ServletHolder servlet = new ServletHolder(ServletContainer.class);
        servlet.setInitParameter("com.sun.jersey.config.property.resourceConfigClass", "com.sun.jersey.api.core.PackagesResourceConfig");
        servlet.setInitParameter("com.sun.jersey.config.property.packages", "com.linux.huhx.business");
        servlet.setInitParameter("com.sun.jersey.api.json.POJOMappingFeature", "true");
        ServletContextHandler handler = new ServletContextHandler(ServletContextHandler.SESSIONS);
        handler.setContextPath("/");
        handler.addServlet(servlet, "/*");
        server.setHandler(handler);
        server.start();
        System.out.println("start...in 82");
    }
}

三、定义restful网格的api接口

package com.linux.huhx.business.action;

import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import java.util.HashMap;
import java.util.Map;

@Path("hello")
public class HelloHuhxResource {

    /**
     * 简单的get请求，返回json数据
     * @return
     */
    @GET
    @Path("huhx")
    @Produces(MediaType.APPLICATION_JSON)
    public Map<String, String> sayHelloHuhx() {
        Map<String, String> map = new HashMap<>();
        map.put("returnCode", "000000");
        map.put("returnMsg", "I love you");
        return map;
    }

    /**
     * json的请求和json数据的返回
     * @param paramMap
     * @return
     */
    @POST
    @Path("linux")
    @Produces(MediaType.APPLICATION_JSON)
    public Map<String, String> sayHelloLinux(Map<String, String> paramMap) {
        Map<String, String> map = new HashMap<>();
        map.put("username", paramMap.get("username"));
        map.put("password", paramMap.get("password"));
        return map;
    }
}

四、用浏览器和postman测试的结果如下

•  访问：http://localhost:8090/hello/huhx

返回结果：{"returnCode":"000000","returnMsg":"I love you"}

•  访问：http://localhost:8090/hello/linux 参数：{ "username": "linux", "password": "12345"}

返回结果：{ "password": "12345",  "username": "linux"}

友情链接

• 关于jersey的文档：https://jersey.github.io/documentation/latest/index.html
• 关于java EE规范的restful： https://www.safaribooksonline.com/library/view/java-ee-7/9781449370589/ch04.html