转换RSS订阅XML使用Java JSON来只显示最后输入

可以说我有一个RSS源（这是XML格式）一种看起来像这样：转换RSS订阅XML使用Java JSON来只显示最后输入

<?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>

二手varren的建议，但它返回最后一个条目，而不是所有的人......

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; 
}

的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>

现在的问题是，它的外核层y返回RSS Feed中的最后一项而不是全部？！？它将它生成为JSON，但只显示最后一个条目。

为什么不显示所有条目？

任何人都可以提出一种不同的方法（例如如何使用罗马或直接DOM做到这一点）？

来源

2017-09-23 PacificNW_Lover

请检查我的解决方案，它打印所需的输出即'item'作为对象的数组，而不是作为单个对象。 – JRG

得到它的工作是这样的：

@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; 
}

来源

2017-09-27 08:58:58

可以使用Jackson与XML相关性：

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

而简单的用例样子（其实你可以自定义几乎与定制POJO和大量的注释或manualy地图XML属性/前缀的一些JSON值的一切）：

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); 
    } 
}

结果：

{ 
    "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   " 
    } 
    } 
}

来源

2017-09-23 07:20:05 varren

我无法使用getResourceAsStream（） - RSS源是外部URL。我用你建议的基本解决方案更新了我的文章。它抛出一个例外。请查看最新更新的帖子。非常感谢你。 –

@PacificNW_Lover您显示的错误与'new URL（“samplefeed.com/feed”）无关。openStream（）;''关于'jackson-core' /'jackson-dataformat-xml'版本不兼容。如果不知道你的堆栈，很难分辨出发生了什么。你能显示你的gradle/maven依赖吗？ – varren

我更新了大多数我的pom.xml文件到2.9.1，现在有一个新问题。请参阅修订后的文章...现在它给了我一个HTTP 403.你是否知道一个不同的机制来从该外部URL获取XML作为字符串？ –

别人也有问题，将XML转换到使用杰克逊JSON和只拿到了最后一个元素：Converting xml to json using jackson

所以不是杰克逊，你可以尝试JSON in Java：

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

示例代码

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; 
}

另见：Quickest way to convert XML to JSON in Java

来源

2017-09-26 10:23:30 janih

谢谢，但对不起，你的代码给了我一个HTTP 403. –

增加了一行'conn.setRequestProperty（“User-Agent”，“Mozilla/5.0”）;'。现在应该在阻止Java作为用户代理的网站上工作。 – janih

因为你的初始代码对我有帮助（例如，推荐Java库的JSON并提供maven依赖），我会给你100个奖励点。 –

Why doesn't it display all of entries?

XML在“对象”和“数组”的概念之间没有区别，因此只打印了单个的item，而不是所有的项目。

这里是修复，除了依赖你正在使用中，我使用2个额外的罐子，并有如下几点： -

Java的JSON。罐子：http://www.java2s.com/Code/Jar/j/Downloadjavajsonjar.htm
公地-10：https://mvnrepository.com/artifact/commons-io/commons-io/2.4

代码：

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; 
    } 
}

样品执行命令（检查item是对象的数组，而不是一个单一的对象）

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 
    } 
}

来源

2017-09-27 06:25:41 JRG

转换RSS订阅XML使用Java JSON来只显示最后输入

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