{"id":945,"date":"2018-09-17T18:42:40","date_gmt":"2018-09-17T09:42:40","guid":{"rendered":"https:\/\/chat-messenger.com\/?p=945"},"modified":"2018-12-23T01:52:55","modified_gmt":"2018-12-22T16:52:55","slug":"xmlencoder-writeobject","status":"publish","type":"post","link":"https:\/\/chat-messenger.com\/fr\/blog\/java\/objet-decriture-xmlencoder","title":{"rendered":"Enregistrer l&#039;objet avec Java XMLEncoder"},"content":{"rendered":"<h2 class=\"common_title\"><a name=\"0\">Java <strong>XMLEncodeur<\/strong>Enregistrez l&#039;objet avec,<strong>XMLD\u00e9codeur<\/strong>restaur\u00e9 avec<\/a><\/h2>\n<p>\n<strong>Java<\/strong>objet avec<strong>Format XML<\/strong>Pr\u00e9sentation d&#039;un exemple de programme \u00e0 enregistrer avec .<br \/>\nPour la sortie XML<strong>java.beans.XMLEncoder<\/strong>Utilisez le.<br \/>\nAussi<strong>java.beans.XMLDecoder<\/strong>Nous pr\u00e9senterons \u00e9galement un exemple de programme qui l&#039;utilise pour restaurer des objets enregistr\u00e9s.<\/p>\n<p><script type=\"text\/javascript\" src=\"https:\/\/chat-messenger.com\/js\/common.js?dd12sssas2223\" charset=\"UTF-8\"><\/script><br \/>\n<script type=\"text\/javascript\"> writePR(); <\/script><\/p>\n<h2 class=\"common_title\"><a name=\"1\">exemple de programme<\/a><\/h2>\n<ul>\n<li>Les champs d\u00e9clar\u00e9s priv\u00e9s sont enregistr\u00e9s lorsque vous d\u00e9finissez les m\u00e9thodes getter et setter.<\/li>\n<li>Seules les modifications apport\u00e9es aux variables sont enregistr\u00e9es dans le fichier XML.<\/li>\n<li>Vous pouvez \u00e9galement sp\u00e9cifier java.util.HashMap, java.util.ArrayList, etc. comme objet \u00e0 enregistrer. Ceci est utile pour simplement sauvegarder l\u2019\u00e9tat d\u2019un objet.<\/li>\n<\/ul>\n<p><textarea readonly=\"readonly\" style=\"font-size: 13px;height: 400px;\" class=\"src\" onclick=\"this.focus();this.select()\">\/**<br \/>\n * java.beans.XMLEncoder\u3092\u4f7f\u7528\u3057\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8[object]\u3092\u3001<br \/>\n * \u6307\u5b9a\u3057\u305f\u30d1\u30b9[path]\u306b\u3001XML\u30d5\u30a1\u30a4\u30eb\u3068\u3057\u3066\u4fdd\u5b58\u3057\u307e\u3059\u3002<br \/>\n * \u203b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8[object]\u304cJavaBeans\u306e\u6163\u4f8b\u306b\u9069\u5408\u3057\u3066\u3044\u308b\u5834\u5408\u3001<br \/>\n * \u3000\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306a\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u30c7\u30fc\u30bf\u3082\u4fdd\u5b58\u3067\u304d\u307e\u3059\u3002<br \/>\n * \u203b\u4fdd\u5b58\u3057\u305fXML\u30d5\u30a1\u30a4\u30eb\u306fjava.beans.XMLDecoder\u3067\u5fa9\u5143\u3059\u308b\u4e8b\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n * @param path \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4fdd\u5b58\u3059\u308b\u30d1\u30b9\u3002<br \/>\n *              \u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u53ef\u80fd\u3067\u3042\u308c\u3070\u4f5c\u6210\u3057\u307e\u3059\u3002<br \/>\n * @param object \u4fdd\u5b58\u3059\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3002<br \/>\n * @throws FileNotFoundException<br \/>\n *                 \u6307\u5b9a\u3055\u308c\u305f\u30d1\u30b9\u540d\u3067\u793a\u3055\u308c\u308b\u30d5\u30a1\u30a4\u30eb\u304c\u958b\u3051\u306a\u304b\u3063\u305f\u5834\u5408<br \/>\n *\/<br \/>\npublic static synchronized void writeXML(String path, Object object)<br \/>\n        throws IOException {<br \/>\n    XMLEncoder enc = null;<br \/>\n    ByteArrayOutputStream out = new ByteArrayOutputStream();<br \/>\n    FileOutputStream fileStream = null;<br \/>\n    try {<br \/>\n        \/\/ \u5148\u306b\u30e1\u30e2\u30ea\u4e2d\u306bXML\u30c7\u30fc\u30bf\u3092\u51fa\u529b\u3059\u308b<br \/>\n        enc = new XMLEncoder(out);<br \/>\n        enc.writeObject(object);<br \/>\n        enc.close(); \/\/ close()\u306e\u4e2d\u3067flush()\u304c\u547c\u3070\u308c\u308b\u3002<br \/>\n        byte[] xmlbuff = out.toByteArray();<\/p>\n<p>        \/\/ Sortie des donn\u00e9es d&#039;octet dans un fichier<br \/>\n        fileStream = nouveau FileOutputStream(chemin);<br \/>\n        fileStream.write(xmlbuff);<br \/>\n        fileStream.flush();<br \/>\n    } enfin {<br \/>\n        si (enc != null) {<br \/>\n            enc.close();<br \/>\n        }<br \/>\n        si (out != null) {<br \/>\n            out.close();<br \/>\n        }<br \/>\n        si (fileStream != null) {<br \/>\n            fileStream.close();<br \/>\n        }<br \/>\n    }<br \/>\n}<br \/>\n\/**<br \/>\n * Restaure l&#039;objet \u00e0 partir du fichier XML au chemin sp\u00e9cifi\u00e9 [chemin].<br \/>\n * *Les fichiers XML doivent \u00eatre enregistr\u00e9s \u00e0 l&#039;aide de java.beans.XMLEncoder.<br \/>\n * @param path Le chemin o\u00f9 l&#039;objet est stock\u00e9.<br \/>\n * @throws FileNotFoundException<br \/>\n * Si le fichier indiqu\u00e9 par le nom de chemin sp\u00e9cifi\u00e9 n&#039;existe pas<br \/>\n *\/<br \/>\nL&#039;objet statique public readXML (chemin de cha\u00eene) lance FileNotFoundException {<br \/>\n    XMLDecoder d = nul\u00a0;<br \/>\n    essayer {<br \/>\n        d = nouveau XMLDecoder (nouveau BufferedInputStream (<br \/>\n                nouveau FileInputStream(chemin)));<br \/>\n        return d.readObject();<br \/>\n    } enfin {<br \/>\n        si (d != nul) {<br \/>\n            d.close();<br \/>\n        }<br \/>\n    }<br \/>\n}<br \/>\n<\/textarea><\/p>\n<p>*La classe suivante sera utilis\u00e9e comme \u00e9chantillon de la classe \u00e0 sauvegarder.<br \/>\n<textarea readonly=\"readonly\" style=\"font-size: 13px;height: 250px\" class=\"src\" onclick=\"this.focus();this.select()\">public class FreeSoft {<br \/>\n    private String name;<br \/>\n    private String url;<br \/>\n    public String getName() {<br \/>\n        return name;<br \/>\n    }<br \/>\n    public void setName(String name) {<br \/>\n        this.name = name;<br \/>\n    }<br \/>\n    public String getUrl() {<br \/>\n        return url;<br \/>\n    }<br \/>\n    public void setUrl(String url) {<br \/>\n        this.url = url;<br \/>\n    }<br \/>\n}<br \/>\n<\/textarea><br \/>\n<\/p>\n<h2 class=\"common_title\"><a name=\"2\">R\u00e9sultat de l&#039;ex\u00e9cution<\/a><\/h2>\n<p>\u25c6Exemple d&#039;ex\u00e9cution<br \/>\n<textarea readonly=\"readonly\" style=\"font-size: 13px;height: 250px\" class=\"src\" onclick=\"this.focus();this.select()\">public static void main(String[] args) {<br \/>\n    try {<br \/>\n        \/\/ FreeSoft\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u751f\u6210\u3057XML\u306b\u51fa\u529b<br \/>\n        FreeSoft freeSoft = new FreeSoft();<br \/>\n        freeSoft.setName(&#8220;Chat\uff06Messenger \u30c1\u30e3\u30c3\u30c8\u3082\u30e1\u30c3\u30bb\u30f3\u30b8\u30e3\u30fc\u3082\uff01\uff01&#8221;);<br \/>\n        freeSoft.setUrl(&#8220;https:\/\/chat-messenger.com\/&#8221;);<br \/>\n        writeXML(&#8220;C:\\\\FreeSoft.xml&#8221;,freeSoft);  <\/p>\n<p>        \/\/ Restaure l&#039;instance de la classe FreeSoft \u00e0 partir de XML<br \/>\n        FreeSoft freeSoft2 = (FreeSoft)readXML(&quot;C:\\\\FreeSoft.xml&quot;);<br \/>\n        System.out.println(\u00ab Nom du logiciel : \u00bb+freeSoft2.getName());<br \/>\n        System.out.println(&quot;URL:&quot;+freeSoft2.getUrl());<br \/>\n    } attraper (Exception e) {<br \/>\n        e.printStackTrace();<br \/>\n    }<br \/>\n}<br \/>\n<\/textarea><br \/>\n\u25c6R\u00e9sultat de sortie<\/p>\n<pre class=\"console\">Nom du logiciel : Chat &amp; Messenger \u00c0 la fois chat et messager ! ! URL : https:\/\/chat-messenger.com\/\r\n<\/pre>\n<p>\u25c6Contenu de C:\\\\FreeSoft.xml<\/p>\n<pre class=\"sample_src\"><object> Chat et Messenger Chat et Messenger\u00a0! ! https:\/\/chat-messenger.com\/<\/object> \r\n<\/pre>\n<h2 class=\"common_title\"><a name=\"3\">Points \u00e0 noter lors de l&#039;utilisation<\/a><\/h2>\n<p>Les classes java.beans.XMLEncoder et java.beans.XMLDecoder sont utiles, mais lorsqu&#039;elles sont utilis\u00e9es pratiquement dans Chat&amp;Messenger, dans des cas extr\u00eamement rares, lors de la sortie en XML avec java.beans.XMLEncoder, le fichier devient 0 octet. Confirmation.<br \/>\nSi un fichier de 0 octet est lu, une ParseException sera enregistr\u00e9e dans la \u00ab sortie d&#039;erreur standard \u00bb.<br \/>\n<br \/>\nLa raison en est que le fichier devient vide lorsque l&#039;instance FileOutputStream est cr\u00e9\u00e9e.<br \/>\nJe pense que cela se produit lorsque le processus Java est arr\u00eat\u00e9 apr\u00e8s l&#039;instanciation de FileOutputStream mais avant la sortie des donn\u00e9es XML.<br \/>\n<br \/>\nEn raison de ce probl\u00e8me, Chat&amp;Messenger cr\u00e9e un fichier de sauvegarde pour \u00e9viter le probl\u00e8me.<\/p>","protected":false},"excerpt":{"rendered":"<p>Enregistrez les objets avec Java XMLEncoder et restaurez avec XMLDecoder Enregistrez les objets avec Java XML [\u2026]<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":""},"categories":[19],"tags":[],"_links":{"self":[{"href":"https:\/\/chat-messenger.com\/fr\/wp-json\/wp\/v2\/posts\/945"}],"collection":[{"href":"https:\/\/chat-messenger.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/chat-messenger.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/chat-messenger.com\/fr\/wp-json\/wp\/v2\/comments?post=945"}],"version-history":[{"count":4,"href":"https:\/\/chat-messenger.com\/fr\/wp-json\/wp\/v2\/posts\/945\/revisions"}],"predecessor-version":[{"id":1880,"href":"https:\/\/chat-messenger.com\/fr\/wp-json\/wp\/v2\/posts\/945\/revisions\/1880"}],"wp:attachment":[{"href":"https:\/\/chat-messenger.com\/fr\/wp-json\/wp\/v2\/media?parent=945"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/chat-messenger.com\/fr\/wp-json\/wp\/v2\/categories?post=945"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/chat-messenger.com\/fr\/wp-json\/wp\/v2\/tags?post=945"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}