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Aplikasi pertama (Longsor - kerangka kerja aplikasi untuk Java)

Aplikasi pertama (Longsor - kerangka kerja aplikasi untuk Java)


"Longsoran - kerangka kerja aplikasi untuk Java" - implementasi teknologi menghapus perbedaan di antara keduanya
panggilan kode lokal dan jarak jauh. Toleransi kesalahan, skalabilitas,
dapat dimodifikasi, ketersediaan terus menerus dibundel dengan bonus bagus.


Semua bahasa pemrograman menyarankan dimulai dengan menulis program keluaran sederhana.
Halo pesan dunia. Contoh ini tidak cocok untuk menunjukkan fungsional
fitur "Longsoran - kerangka kerja aplikasi untuk Java", karena memanggil contoh ini selalu
mengembalikan string yang sama dan tidak memungkinkan untuk mengidentifikasi sumber yang mengembalikan ini
hasil.


Untuk aplikasi pertama, Anda perlu mengimplementasikan dua kelas (fungsi dan aplikasi), satu
antarmuka (adaptor fungsi) dan satu halaman JSP untuk menampilkan hasilnya. Dirancang oleh
aplikasi akan berjalan di bawah Tomcat.


Implementasi Kelas Fungsi - DemoFungsi


Tidak ada yang istimewa dalam kelas implementasi fungsi, ini adalah kelas Java biasa. Sebagai a
kelas fungsi kelas apa pun dapat digunakan. Biarkan kelas demo fungsi
mengembalikan informasi berikut dari sistem operasi: PID dari proses dan nama server;
versi sistem operasi; nama sistem operasi.


Kode Kelas DemoFunction.java


package ru.funsys.demo.avalanche;

import java.lang.management.ManagementFactory;
import java.util.Hashtable;

public class DemoFunction {

    /**
     *     .<br>
     * <br>
     *      <br>
     * <b>os.name</b> -  ,<br>
     * <b>os.version</b> -  <br>
     *  <b>PID@name</b> -      
     * 
     * @return     
     */
    public Hashtable<String, String> getInfo() {
        Hashtable<String, String> result = new Hashtable<String, String>();
        result.put("os.name", System.getProperty("os.name"));
        result.put("os.version", System.getProperty("os.version"));
        result.put("PID@name", ManagementFactory.getRuntimeMXBean().getName());
        return result;
    }

}

— DemoAdapter


Java, — ,
,
. DemoFunction


DemoAdapter.java


package ru.funsys.demo.avalanche;

import java.util.Hashtable;

import ru.funsys.avalanche.AvalancheRemote;

public interface DemoAdapter {

    public Hashtable<String, String> getInfo() throws AvalancheRemote;

}

, DemoAdapter
AvalancheRemote.
RMI Java,
:


  • ( — DemoFunction)
    ( — DemoAdapter)
  • ( — DemoAdapter)
    (, DemoFunction), ,
    .

, .


— DemoApplication


DemoApplication — getInfo() DemoFunction
DemoAdapter. DemoApplication
getInfo() TXT HTML.


DemoApplication.java


package ru.funsys.demo.avalanche;

import java.util.Enumeration;
import java.util.Hashtable;

import ru.funsys.avalanche.Application;
import ru.funsys.avalanche.AvalancheRemote;

public class DemoApplication extends Application {

    /**
     *      
     */
    private DemoAdapter info;

    /**
     *        
     *      HTML     .
     * 
     * @param html true,    HTML,  false
     * 
     * @return    HTML   
     */
    public String getInfo(boolean html) {
        StringBuilder builder = new StringBuilder();
        if (html) {
            builder.append("<table border=\"1\">");
            builder.append("<tr><th>key</th><th>value</th></tr>");
        }
        try {
            //   
            Hashtable<String, String> result = info.getInfo();

            for (Enumeration<String> enumeration = result.keys(); enumeration.hasMoreElements(); ) {
                String key = enumeration.nextElement();
                String value = result.get(key);
                if (html) {
                    builder.append("<tr><td>").append(key).append("</td><td>").append(value).append("</td></tr>");
                } else {
                    builder.append(key).append(": ").append(value).append("\r\n");
                }
            }
        } catch (AvalancheRemote e) {
            if (html) {
                builder.append("<tr><td>").append("error").append("</td><td>").append(e.getLocalizedMessage()).append("</td></tr>");
            } else {
                builder.append("error").append(": ").append(e.getLocalizedMessage()).append("\r\n");
            }
        }
        if (html) builder.append("</table>");
        return builder.toString();
    }

}

: ru.funsys.avalanche.Application.


info , , getAdapter(String name) ru.funsys.avalanche.Application. . .


JSP — first.jsp


JSP . DemoApplication getInfo c true.


<%@ page import="ru.funsys.demo.avalanche.DemoApplication"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title> </title>
</head>
<body>
<h1> </h1>
<jsp:useBean id='DemoApp' scope='application' class='ru.funsys.demo.avalanche.DemoApplication'/>

<%= DemoApp.getInfo(true) %>
<br>

</body>
</html>

. .


web.xml


web.xml AvalancheServlet, log4j. AvalancheServlet avalanche-config.xml.


<?xml version="1.0" encoding="UTF-8"?>
<!--
web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0" 
-->
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">

    <display-name>Demo Avalanche</display-name>
    <description>
            framework Avalanche
    </description>

    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.htm</welcome-file>
        <welcome-file>index.jsp</welcome-file>
        <welcome-file>default.html</welcome-file>
        <welcome-file>default.htm</welcome-file>
        <welcome-file>default.jsp</welcome-file>
    </welcome-file-list>

    <servlet>
        <display-name>AvalancheServlet</display-name>
        <servlet-name>AvalancheServlet</servlet-name>
        <servlet-class>ru.funsys.servlet.http.AvalancheServlet</servlet-class>
        <init-param>
            <param-name>avalanche.config</param-name>
            <param-value>${catalina.base}/conf/avalanche-config.xml</param-value>
        </init-param>
        <init-param>
            <param-name>avalanche.log4j</param-name>
            <param-value>${catalina.base}/conf/avalanche-log4j.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

</web-app>

avalanche-config.xml



<?xml version="1.0" encoding="UTF-8"?>
<avalanche name="Demo Application">

    <function class="ru.funsys.demo.avalanche.DemoFunction" name="info-function" description="   " />

    <application class="ru.funsys.demo.avalanche.DemoApplication" name="DemoApp" >
        <adapter class="ru.funsys.demo.avalanche.DemoAdapter" name="info" uri="info-function" />
    </application>

</avalanche>

<function> <application>. <application> <adapter>, uri (. name <function>).


name <application>, DemoApp id DemoApplication JSP .


DemoFunction


, , REST, SOAP .


"Avalanche — application framework for Java" DemoFunction. .


avalanche-config.xml :


  • <interface>,
  • <connector>, .

RMI


RMI


<interface name="rmi-interface" uri="rmi://localhost:23000/rmi-connector" />

:


  • localhost
  • 23000 RMI Remote Server
  • rmi-connector

<connector>


<connector class="RMIConnector" name="rmi-connector" port="23000" >
    <publish name="info" function="info-function" />
</connector>

:


  • rmi-connector
  • 23000 RMI Remote Server
  • <publish> info-function , info-function info

HTTP


HTTP


<interface name="http-interface" uri="http://localhost:8080/demo/connector/http-connector" />

:


  • localhost
  • 8080 HTTP Server
  • demo
  • connector AvalancheServlet
  • http-connector

<connector>


<connector class="HTTPConnector" name="http-connector" >
    <publish name="info" function="info-function" />
</connector>

:


  • http-connector
  • <publish> info-function , info-function info

! HTTP , HTTP (Tomcat).


<multipart-config> AvalancheServlet <servlet-mapping> URI web.xml.


web.xml


<?xml version="1.0" encoding="UTF-8"?>
<!--
web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0" 
-->
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">

    <display-name>Demo Avalanche</display-name>
    <description>
            framework Avalanche
    </description>

    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.htm</welcome-file>
        <welcome-file>index.jsp</welcome-file>
        <welcome-file>default.html</welcome-file>
        <welcome-file>default.htm</welcome-file>
        <welcome-file>default.jsp</welcome-file>
    </welcome-file-list>

    <servlet>
        <display-name>AvalancheServlet</display-name>
        <servlet-name>AvalancheServlet</servlet-name>
        <servlet-class>ru.funsys.servlet.http.AvalancheServlet</servlet-class>
        <init-param>
            <param-name>avalanche.config</param-name>
            <param-value>${catalina.base}/conf/avalanche-config.xml</param-value>
        </init-param>
        <init-param>
            <param-name>avalanche.log4j</param-name>
            <param-value>${catalina.base}/conf/avalanche-log4j.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
        <multipart-config>
            <!-- 50MB max -->
            <max-file-size>52428800</max-file-size>
            <max-request-size>52428800</max-request-size>
            <file-size-threshold>0</file-size-threshold>
        </multipart-config>
    </servlet>

    <servlet-mapping>
        <servlet-name>AvalancheServlet</servlet-name>
        <url-pattern>/connector/*</url-pattern>
    </servlet-mapping>

</web-app>

, <application> RMIApp HTTPApp. uri <adapter> -/- , .. rmi-interface/info http-interface/info.


avalanche-config.xml RMI HTTP


<?xml version="1.0" encoding="UTF-8"?>
<avalanche name="Demo Application">

    <interface name="rmi-interface" uri="rmi://localhost:23000/rmi-connector" />

    <interface name="http-interface" uri="http://localhost:8080/demo/connector/http-connector" />

    <function class="ru.funsys.demo.avalanche.DemoFunction" name="info-function" description="   " />

    <application class="ru.funsys.demo.avalanche.DemoApplication" name="DemoApp" >
        <adapter class="ru.funsys.demo.avalanche.DemoAdapter" name="info" uri="info-function" />
    </application>

    <application class="ru.funsys.demo.avalanche.DemoApplication" name="RMIApp" >
        <adapter class="ru.funsys.demo.avalanche.DemoAdapter" name="info" uri="rmi-interface/info" />
    </application>

    <application class="ru.funsys.demo.avalanche.DemoApplication" name="HTTPApp" >
        <adapter class="ru.funsys.demo.avalanche.DemoAdapter" name="info" uri="http-interface/info" />
    </application>

    <connector class="RMIConnector" name="rmi-connector" port="23000" >
        <publish name="info" function="info-function" />
    </connector>

    <connector class="HTTPConnector" name="http-connector" >
        <publish name="info" function="info-function" />
    </connector>

</avalanche>

JSP first.jsp RMI HTTP, id RMIApp HTTPApp .


rmi.jsp


<%@ page import="ru.funsys.demo.avalanche.DemoApplication"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>  - RMI</title>
</head>
<body>
<h1>  - RMI</h1>
<p>
  -  RMI
</p>
<jsp:useBean id='RMIApp' scope='application' class='ru.funsys.demo.avalanche.DemoApplication'/>

<%= RMIApp.getInfo(true) %>

</body>
</html>

http.jsp


<%@ page import="ru.funsys.demo.avalanche.DemoApplication"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>  - HTTP</title>
</head>
<body>
<h1>  - HTTP</h1>
<p>
  -  HTTP
</p>
<jsp:useBean id='HTTPApp' scope='application' class='ru.funsys.demo.avalanche.DemoApplication'/>

<%= HTTPApp.getInfo(true) %>

</body>
</html>

, localhost <interface> avalanche-config.xml, .


, .


, , GitHub

Source: https://habr.com/ru/post/id477350/

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