构建第一个RESTful服务

最新推荐文章于 2021-08-18 16:38:50 发布

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#java #web.xml

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本文介绍了一个简单的RESTful服务实现过程，包括必要的jar包导入、资源类定义、路由配置及web.xml设置。通过GET请求返回固定字符串，POST请求则接收两个参数并返回它们相加的结果。

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1、导入所需要的jar包

org.restlet.jar

org.restlet.ext.servlet.jar

2、package cn.jess;

import org.restlet.data.Form;
import org.restlet.representation.Representation;
import org.restlet.resource.Get;
import org.restlet.resource.Post;
import org.restlet.resource.ServerResource;

public class TestResource extends ServerResource{

    @Get
    public String getResultGet()
    {
        return "This is my first REST";
    }
    @Post
    public String getResultPost(Representation entity)
    {
        Form form = new Form(entity);
        String first = form.getFirstValue("first");
        String second = form.getFirstValue("second");
        int a = Integer.parseInt(first);
        int b = Integer.parseInt(second);

        return "The result of "+a+"+"+b +" is "+(a+b);
    }
}

package cn.jess;

import org.restlet.Application;
import org.restlet.Context;
import org.restlet.Restlet;
import org.restlet.routing.Router;

public class RouterPath extends Application {

    public RouterPath(Context parentContext) {
        super(parentContext);
        }

    @Override
    public Restlet createInboundRoot()
    {
        Router router = new Router(getContext());
        router.attach("/greeting", TestResource.class);
        return router;
    }


    public synchronized Restlet createRoot() {
        // Create a router Restlet that routes each call to a
        // new instance of HelloWorldResource.
        Router router =new Router(getContext());

        // Defines only one route
        router.attachDefault(TestResource.class);

        return router;
        }
}

3、web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name></display-name>
<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
</welcome-file-list>

<context-param>
    <param-name>org.restlet.application</param-name>
    <param-value>cn.jess.RouterPath</param-value>
</context-param>

<servlet>
    <servlet-name>RestletServlet</servlet-name>
    <servlet-class>org.restlet.ext.servlet.ServerServlet</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>RestletServlet</servlet-name>
    <url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>