Convert RSS Feed XML JSON en utilisant Java Affiche uniquement Dernière entrée

Disons que j'ai un flux RSS (qui est en format XML) qui ressemble un peu comme ceci:Convert RSS Feed XML JSON en utilisant Java Affiche uniquement Dernière entrée

<?xml version="1.0" encoding="UTF-8"?> 
<rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/" 
    xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:dc="http://purl.org/dc/elements/1.1/" 
    xmlns:atom="http://www.w3.org/2005/Atom" xmlns:sy="http://purl.org/rss/1.0/modules/syndication/" 
    xmlns:slash="http://purl.org/rss/1.0/modules/slash/"> 

    <channel> 
     <title>MyFeed</title> 
     <atom:link href="http://samplefeed.com/feed/" rel="self" 
      type="application/rss+xml" /> 
     <link>http://samplefeed.com</link> 
     <description></description> 
     <lastBuildDate>Fri, 22 Sep 2017 22:43:51 +0000</lastBuildDate> 
     <language>en-US</language> 
     <sy:updatePeriod>hourly</sy:updatePeriod> 
     <sy:updateFrequency>1</sy:updateFrequency> 
     <generator>http://wordpress.org/?v=4.3.12</generator> 
     <item> 
      <title>A Good Product</title> 
      <link>http://samplefeed.com/a-good-product/</link> 
      <comments>http://samplefeed.com/a-good-product/#comments</comments> 
      <pubDate>Wed, 20 Sep 2017 22:22:45 +0000</pubDate> 
      <dc:creator><![CDATA[John Smith]]></dc:creator> 
      <category><![CDATA[Entertainment]]></category> 

      <guid isPermaLink="false">http://samplefeed.com/?p=9116</guid> 
      <description> 
       <![CDATA[<p>![CDATA[<p>9/22</p> 
       <p>4K TV Samsung<br /> 
       Price: $500.00<br /> 
       Location: Walmart</p> 
       ]]> 
      </description> 
     </item> 
     <!-- More items --> 
    </channel> 
</rss>

occasion suggestion Varren mais il renvoie le dernière entrée au lieu de tous ...

public static void main(String[] args) throws MalformedURLException, IOException { 
    XmlMapper xmlMapper = new XmlMapper(); // <- This is line 21 
    ObjectMapper jsonMapper = new ObjectMapper(); 
    InputStream xml = getInputStreamFromUrlData("http://samplefeed.com/feed"); 
    String json = jsonMapper.writeValueAsString(xmlMapper.readTree(xml)); 
    System.out.println(json);  
} 

public static InputStream getInputStreamForURLData(String Url) { 
    URL url = null; 
    HttpURLConnection httpConnection = null; 
    InputStream content = null; 

    try { 
     url = new URL(Url); 
     System.out.println("URL: " + Url); 
     URLConnection conn = url.openConnection(); 
     conn.setRequestProperty("User-Agent", "Mozilla/5.0"); 
     httpConnection = (HttpURLConnection) conn; 

     int responseCode = httpConnection.getResponseCode(); 
     System.out.println("Response Code : " + responseCode); 

     content = (InputStream) httpConnection.getInputStream(); 
    } 
    catch (MalformedURLException e) { 
     e.printStackTrace(); 
    } 
    catch (IOException e) { 
     e.printStackTrace(); 
    } 
    return content; 
}

pom.xml:

<dependency> 
     <groupId>com.fasterxml.jackson.core</groupId> 
     <artifactId>jackson-annotations</artifactId> 
     <version>2.9.1</version> 
    </dependency> 

    <dependency> 
     <groupId>com.fasterxml.jackson.core</groupId> 
     <artifactId>jackson-core</artifactId> 
     <version>2.9.1</version> 
    </dependency> 

    <dependency> 
     <groupId>org.codehaus.jackson</groupId> 
     <artifactId>jackson-core-asl</artifactId> 
     <version>1.7.9</version> 
    </dependency> 

    <dependency> 
     <groupId>com.fasterxml.jackson.core</groupId> 
     <artifactId>jackson-databind</artifactId> 
     <version>2.8.10</version> 
    </dependency> 

    <dependency> 
     <groupId>org.codehaus.jackson</groupId> 
     <artifactId>jackson-mapper-asl</artifactId> 
     <version>1.7.9</version> 
    </dependency> 

    <dependency> 
     <groupId>org.codehaus.jackson</groupId> 
     <artifactId>jackson-xc</artifactId> 
     <version>1.7.9</version> 
    </dependency> 

    <dependency> 
     <groupId>com.fasterxml.jackson.dataformat</groupId> 
     <artifactId>jackson-dataformat-xml</artifactId> 
     <version>2.9.1</version> 
    </dependency>

Le problème est maintenant que son ONL y renvoyer le dernier élément dans le flux RSS au lieu de tous les?!? Il le produit en JSON mais seulement la dernière entrée est affichée.

Pourquoi n'affiche-t-il pas toutes les entrées?

Quelqu'un peut-il suggérer une approche différente (par exemple, comment faire cela en utilisant Rome ou directement DOM)?

Source

2017-09-23 PacificNW_Lover

S'il vous plaît vérifier ma solution, il imprime la sortie désirée 'dire item' comme un tableau d'objets et non comme un objet unique. – JRG

obtenu ce travail comme celui-ci:

@RequestMapping(value = "/v2/convertIntoJson", 
       method = RequestMethod.GET, 
       produces = "application/json") 
public String getRssFeedAsJson() throws IOException { 
    InputStream xml = getInputStreamForURLData("http://www.samplefeed.com/feed/"); 
    byte[] byteArray = IOUtils.toByteArray(xml); 
    String xmlString = new String(byteArray); 
    JSONObject xmlToJsonObject = XML.toJSONObject(xmlString); 
    String jsonString = xmlToJsonObject.toString(); 
    byte[] jsonStringAsByteArray = jsonString.getBytes("UTF-8"); 
    String retValue = new String(jsonStringAsByteArray, "UTF-8"); 
    return retValue; 
} 

public static InputStream getInputStreamForURLData(String Url) { 
    URL url = null; 
    HttpURLConnection httpConnection = null; 
    InputStream content = null; 

    try { 
     url = new URL(Url); 
     System.out.println("URL::" + Url); 
     URLConnection conn = url.openConnection(); 
     conn.setRequestProperty("User-Agent", "Mozilla/5.0"); 
     httpConnection = (HttpURLConnection) conn; 

     int responseCode = httpConnection.getResponseCode(); 
     System.out.println("Response Code : " + responseCode); 

     content = (InputStream) httpConnection.getInputStream(); 
    } 
    catch (MalformedURLException e) { 
     e.printStackTrace(); 
    } 
    catch (IOException e) { 
     e.printStackTrace(); 
    } 
    return content; 
}

Source

2017-09-27 08:58:58

peut utiliser Jackson avec dépendances xml:

compile 'com.fasterxml.jackson.core:jackson-databind:2.9.1' 
compile 'com.fasterxml.jackson.core:jackson-core:2.9.1' 
compile 'com.fasterxml.jackson.dataformat:jackson-dataformat-xml:2.9.1' // <= that

et simple cas d'utilisation ressemble (vous pouvez réellement personnaliser presque tout avec POJO personnalisés et beaucoup d'annotations ou des attributs manualy carte xml/préfixes à certaines valeurs de JSON) :

public class Main4 { 
    public static void main(String[] args) throws Exception { 
    XmlMapper xmlMapper = new XmlMapper(); 
    ObjectMapper jsonMapper = new ObjectMapper(); 
    InputStream XML = Main4.class.getClassLoader() 
      .getResourceAsStream("rss.xml"); 
    String json = jsonMapper.writeValueAsString(xmlMapper.readTree(XML)); 
    System.out.println(json); 
    } 
}

Résultats dans:

{ 
    "version": "2.0", 
    "channel": { 
    "title": "MyFeed", 
    "link": "http://samplefeed.com", 
    "description": "", 
    "lastBuildDate": "Fri, 22 Sep 2017 22:43:51 +0000", 
    "language": "en-US", 
    "updatePeriod": "hourly", 
    "updateFrequency": "1", 
    "generator": "http://wordpress.org/?v=4.3.12", 
    "item": { 
     "title": "A Good Product", 
     "link": "http://samplefeed.com/a-good-product/", 
     "comments": "http://samplefeed.com/a-good-product/#comments", 
     "pubDate": "Wed, 20 Sep 2017 22:22:45 +0000", 
     "creator": "John Smith", 
     "category": "Entertainment", 
     "guid": { 
     "isPermaLink": "false", 
     "": "http://samplefeed.com/?p=9116" 
     }, 
     "description": "\n    <p>![CDATA[<p>9/22</p>\n    <p>4K TV Samsung<br />\n    Price: $500.00<br />\n    Location: Walmart</p>\n    \n   " 
    } 
    } 
}

Source

2017-09-23 07:20:05 varren

Je ne peux pas utiliser getResourceAsStream() - le flux RSS est une URL externe. J'ai mis à jour mon post avec la solution de base que vous avez suggérée. C'est jeter une exception. Veuillez consulter le post récemment mis à jour. Merci beaucoup. –

@PacificNW_Lover l'erreur que vous affichez n'a rien à voir avec 'new URL (" samplefeed.com/feed "). OpenStream();' il s'agit de l'incompatibilité de la version 'jackson-core' /' jackson-dataformat-xml'. Il est difficile de dire ce qui se passe sans connaître votre pile. pouvez-vous montrer vos dépendances gradle/maven? – varren

J'ai mis à jour la plupart de mes fichiers pom.xml en 2.9.1 et j'ai maintenant un nouveau problème. S'il vous plaît voir post révisé ... Maintenant, il me donne un HTTP 403. Connaissez-vous un mécanisme différent pour obtenir le XML comme une chaîne de cette URL externe? –

Quelqu'un d'autre avait aussi des problèmes de conversion xml à JSON en utilisant Jackson et n'a obtenu que le dernier élément: Converting xml to json using jackson

Ainsi, au lieu de Jackson, vous pouvez essayer JSON in Java:

<dependency> 
    <groupId>org.json</groupId> 
    <artifactId>json</artifactId> 
    <version>20170516</version> 
</dependency>

Exemple Code

import java.io.*; 
import java.net.*; 
import org.json.JSONObject; 
import org.json.XML; 
... 
public static void main(String[] args) throws Exception { 
    String xmlString = readUrlToString("http://www.feedforall.com/sample.xml"); 
    JSONObject xmlJSONObj = XML.toJSONObject(xmlString); 
    String jsonPrettyPrintString = xmlJSONObj.toString(4); 
    System.out.println(jsonPrettyPrintString); 
} 

public static String readUrlToString(String url) { 
    BufferedReader reader = null; 
    String result = null; 
    try { 
     URL u = new URL(url); 
     HttpURLConnection conn = (HttpURLConnection) u.openConnection(); 
     conn.setRequestProperty("User-Agent", "Mozilla/5.0"); 
     conn.setRequestMethod("GET"); 
     conn.setDoOutput(true); 
     conn.setReadTimeout(2 * 1000); 
     conn.connect(); 
     reader = new BufferedReader(new InputStreamReader(conn.getInputStream())); 
     StringBuilder builder = new StringBuilder(); 
     String line; 
     while ((line = reader.readLine()) != null) { 
      builder.append(line).append("\n"); 
     } 
     result = builder.toString(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } finally { 
     if (reader != null) { 
      try { reader.close(); } catch (IOException ignoreOnClose) { } 
     } 
    } 
    return result; 
}

Voir aussi: Quickest way to convert XML to JSON in Java

Source

2017-09-26 10:23:30 janih

Merci mais désolé votre code m'a donné un HTTP 403. –

Ligne ajoutée 'conn.setRequestProperty (" User-Agent "," Mozilla/5.0 ");'. Devrait fonctionner maintenant sur les sites qui bloquent Java en tant qu'agent utilisateur. – janih

Depuis, votre code initial m'a aidé (par exemple en recommandant la bibliothèque JSON pour Java et en fournissant la dépendance maven), je vais vous attribuer les 100 points de prime. –

Why doesn't it display all of entries?

XML n'a pas de distinction entre les concepts de "Objets" et "Arrays", par conséquent seul le item est imprimé et pas tous les éléments.

Voici le correctif, outre les dépendances que vous utilisez, j'utilise 2 pots supplémentaires et ils sont les suivants: -

java-JSON.pot: http://www.java2s.com/Code/Jar/j/Downloadjavajsonjar.htm
commons-io: https://mvnrepository.com/artifact/commons-io/commons-io/2.4

Votre code:

import java.io.IOException; 
import java.io.InputStream; 
import java.net.HttpURLConnection; 
import java.net.MalformedURLException; 
import java.net.URL; 
import java.net.URLConnection; 

import org.apache.commons.io.IOUtils; 
import org.json.JSONObject; 
import org.json.XML; 

import com.fasterxml.jackson.databind.ObjectMapper; 
import com.fasterxml.jackson.databind.SerializationFeature; 

public class TestClass { 

    public static void main(String[] args) throws Exception { 
     InputStream xml = getInputStreamFromUrlData("http://www.feedforall.com/sample.xml"); 
     String xmlString = IOUtils.toString(xml); 
     JSONObject jsonObject = XML.toJSONObject(xmlString); 
     ObjectMapper objectMapper = new ObjectMapper(); 
     objectMapper.enable(SerializationFeature.INDENT_OUTPUT); 
     Object json = objectMapper.readValue(jsonObject.toString(), Object.class); 
     String output = objectMapper.writeValueAsString(json); 
     System.out.println(output); 
    } 

    public static InputStream getInputStreamFromUrlData(String Url) { 
     URL url = null; 
     HttpURLConnection httpConnection = null; 
     InputStream content = null; 

     try { 
      url = new URL(Url); 
      System.out.println("URL: " + Url); 
      URLConnection conn = url.openConnection(); 
      conn.setRequestProperty("User-Agent", "Mozilla/5.0"); 
      httpConnection = (HttpURLConnection) conn; 

      int responseCode = httpConnection.getResponseCode(); 
      System.out.println("Response Code : " + responseCode); 

      content = (InputStream) httpConnection.getInputStream(); 
     } catch (MalformedURLException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
     return content; 
    } 
}

Sample Run: (vérifier item est un tableau d'objets et non un seul objet)

URL: http://www.feedforall.com/sample.xml 
Response Code : 200 
{ 
    "rss" : { 
    "channel" : { 
     "image" : { 
     "link" : "http://www.feedforall.com/industry-solutions.htm", 
     "width" : 48, 
     "description" : "FeedForAll Sample Feed", 
     "title" : "FeedForAll Sample Feed", 
     "url" : "http://www.feedforall.com/ffalogo48x48.gif", 
     "height" : 48 
     }, 
     "copyright" : "Copyright 2004 NotePage, Inc.", 
     "item" : [ { 
     "comments" : "http://www.feedforall.com/forum", 
     "link" : "http://www.feedforall.com/restaurant.htm", 
     "description" : "<b>FeedForAll </b>helps Restaurant's communicate with customers. Let your customers know the latest specials or events.<br>\r\n<br>\r\nRSS feed uses include:<br>\r\n<i><font color=\"#FF0000\">Daily Specials <br>\r\nEntertainment <br>\r\nCalendar of Events </i></font>", 
     "title" : "RSS Solutions for Restaurants", 
     "category" : { 
      "domain" : "www.dmoz.com", 
      "content" : "Computers/Software/Internet/Site Management/Content Management" 
     }, 
     "pubDate" : "Tue, 19 Oct 2004 11:09:11 -0400" 
     }, { 
     "comments" : "http://www.feedforall.com/forum", 
     "link" : "http://www.feedforall.com/schools.htm", 
     "description" : "FeedForAll helps Educational Institutions communicate with students about school wide activities, events, and schedules.<br>\r\n<br>\r\nRSS feed uses include:<br>\r\n<i><font color=\"#0000FF\">Homework Assignments <br>\r\nSchool Cancellations <br>\r\nCalendar of Events <br>\r\nSports Scores <br>\r\nClubs/Organization Meetings <br>\r\nLunches Menus </i></font>", 
     "title" : "RSS Solutions for Schools and Colleges", 
     "category" : { 
      "domain" : "www.dmoz.com", 
      "content" : "Computers/Software/Internet/Site Management/Content Management" 
     }, 
     "pubDate" : "Tue, 19 Oct 2004 11:09:09 -0400" 
     }, { 
     "comments" : "http://www.feedforall.com/forum", 
     "link" : "http://www.feedforall.com/computer-service.htm", 
     "description" : "FeedForAll helps Computer Service Companies communicate with clients about cyber security and related issues. <br>\r\n<br>\r\nUses include:<br>\r\n<i><font color=\"#0000FF\">Cyber Security Alerts <br>\r\nSpecials<br>\r\nJob Postings </i></font>", 
     "title" : "RSS Solutions for Computer Service Companies", 
     "category" : { 
      "domain" : "www.dmoz.com", 
      "content" : "Computers/Software/Internet/Site Management/Content Management" 
     }, 
     "pubDate" : "Tue, 19 Oct 2004 11:09:07 -0400" 
     }, { 
     "comments" : "http://www.feedforall.com/forum", 
     "link" : "http://www.feedforall.com/government.htm", 
     "description" : "FeedForAll helps Governments communicate with the general public about positions on various issues, and keep the community aware of changes in important legislative issues. <b><i><br>\r\n</b></i><br>\r\nRSS uses Include:<br>\r\n<i><font color=\"#00FF00\">Legislative Calendar<br>\r\nVotes<br>\r\nBulletins</i></font>", 
     "title" : "RSS Solutions for Governments", 
     "category" : { 
      "domain" : "www.dmoz.com", 
      "content" : "Computers/Software/Internet/Site Management/Content Management" 
     }, 
     "pubDate" : "Tue, 19 Oct 2004 11:09:05 -0400" 
     }, { 
     "comments" : "http://www.feedforall.com/forum", 
     "link" : "http://www.feedforall.com/politics.htm", 
     "description" : "FeedForAll helps Politicians communicate with the general public about positions on various issues, and keep the community notified of their schedule. <br>\r\n<br>\r\nUses Include:<br>\r\n<i><font color=\"#FF0000\">Blogs<br>\r\nSpeaking Engagements <br>\r\nStatements<br>\r\n </i></font>", 
     "title" : "RSS Solutions for Politicians", 
     "category" : { 
      "domain" : "www.dmoz.com", 
      "content" : "Computers/Software/Internet/Site Management/Content Management" 
     }, 
     "pubDate" : "Tue, 19 Oct 2004 11:09:03 -0400" 
     }, { 
     "comments" : "http://www.feedforall.com/forum", 
     "link" : "http://www.feedforall.com/weather.htm", 
     "description" : "FeedForAll helps Meteorologists communicate with the general public about storm warnings and weather alerts, in specific regions. Using RSS meteorologists are able to quickly disseminate urgent and life threatening weather warnings. <br>\r\n<br>\r\nUses Include:<br>\r\n<i><font color=\"#0000FF\">Weather Alerts<br>\r\nPlotting Storms<br>\r\nSchool Cancellations </i></font>", 
     "title" : "RSS Solutions for Meteorologists", 
     "category" : { 
      "domain" : "www.dmoz.com", 
      "content" : "Computers/Software/Internet/Site Management/Content Management" 
     }, 
     "pubDate" : "Tue, 19 Oct 2004 11:09:01 -0400" 
     }, { 
     "comments" : "http://www.feedforall.com/forum", 
     "link" : "http://www.feedforall.com/real-estate.htm", 
     "description" : "FeedForAll helps Realtors and Real Estate companies communicate with clients informing them of newly available properties, and open house announcements. RSS helps to reach a targeted audience and spread the word in an inexpensive, professional manner. <font color=\"#0000FF\"><br>\r\n</font><br>\r\nFeeds can be used for:<br>\r\n<i><font color=\"#FF0000\">Open House Dates<br>\r\nNew Properties For Sale<br>\r\nMortgage Rates</i></font>", 
     "title" : "RSS Solutions for Realtors & Real Estate Firms", 
     "category" : { 
      "domain" : "www.dmoz.com", 
      "content" : "Computers/Software/Internet/Site Management/Content Management" 
     }, 
     "pubDate" : "Tue, 19 Oct 2004 11:08:59 -0400" 
     }, { 
     "comments" : "http://www.feedforall.com/forum", 
     "link" : "http://www.feedforall.com/banks.htm", 
     "description" : "FeedForAll helps <b>Banks, Credit Unions and Mortgage companies</b> communicate with the general public about rate changes in a prompt and professional manner. <br>\r\n<br>\r\nUses include:<br>\r\n<i><font color=\"#0000FF\">Mortgage Rates<br>\r\nForeign Exchange Rates <br>\r\nBank Rates<br>\r\nSpecials</i></font>", 
     "title" : "RSS Solutions for Banks/Mortgage Companies", 
     "category" : { 
      "domain" : "www.dmoz.com", 
      "content" : "Computers/Software/Internet/Site Management/Content Management" 
     }, 
     "pubDate" : "Tue, 19 Oct 2004 11:08:57 -0400" 
     }, { 
     "comments" : "http://www.feedforall.com/forum", 
     "link" : "http://www.feedforall.com/law-enforcement.htm", 
     "description" : "<b>FeedForAll</b> helps Law Enforcement Professionals communicate with the general public and other agencies in a prompt and efficient manner. Using RSS police are able to quickly disseminate urgent and life threatening information. <br>\r\n<br>\r\nUses include:<br>\r\n<i><font color=\"#0000FF\">Amber Alerts<br>\r\nSex Offender Community Notification <br>\r\nWeather Alerts <br>\r\nScheduling <br>\r\nSecurity Alerts <br>\r\nPolice Report <br>\r\nMeetings</i></font>", 
     "title" : "RSS Solutions for Law Enforcement", 
     "category" : { 
      "domain" : "www.dmoz.com", 
      "content" : "Computers/Software/Internet/Site Management/Content Management" 
     }, 
     "pubDate" : "Tue, 19 Oct 2004 11:08:56 -0400" 
     } ], 
     "lastBuildDate" : "Tue, 19 Oct 2004 13:39:14 -0400", 
     "link" : "http://www.feedforall.com/industry-solutions.htm", 
     "description" : "RSS is a fascinating technology. The uses for RSS are expanding daily. Take a closer look at how various industries are using the benefits of RSS in their businesses.", 
     "generator" : "FeedForAll Beta1 (0.0.1.8)", 
     "language" : "en-us", 
     "title" : "FeedForAll Sample Feed", 
     "managingEditor" : "[email protected]", 
     "pubDate" : "Tue, 19 Oct 2004 13:38:55 -0400", 
     "webMaster" : "[email protected]", 
     "docs" : "http://blogs.law.harvard.edu/tech/rss", 
     "category" : { 
     "domain" : "www.dmoz.com", 
     "content" : "Computers/Software/Internet/Site Management/Content Management" 
     } 
    }, 
    "version" : 2 
    } 
}

Source

2017-09-27 06:25:41 JRG

Convert RSS Feed XML JSON en utilisant Java Affiche uniquement Dernière entrée

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