Dom4j 编码问题彻底解决 这几天开始学习dom4j,在网上找了篇文章就开干了,上手非常的快,但是发现了个问题就是无法以UTF-8保存xml文件,保存后再次读出的时候会报“Invalid byte 2 of 2-byte UTF-8 sequence.”这样一个错误,检查发现由dom4j生成的这个文件,在使用可正确处理XML编码的任何的编辑器中中文成乱码,从记事本查看并不会出现乱码会正确显示中文。让我很是头痛。试着使用GBK、gb2312编码来生成的xml文件却可以正常的被解析。因此怀疑的dom4j没有对utf-8编码进行处理。便开始查看dom4j的原代码。终于发现的问题所在,是自己程序的问题。 Document doc = org.dom4j.DocumentHelper.createDocument(); Element root = doc.addElement("book"); root.addAttribute("name", "我的图书"); Element childTmp; childTmp = root.addElement("price"); childTmp.setText("21.22"); Element writer = root.addElement("author"); writer.setText("李四"); writer.addAttribute("ID", "001"); try { org.dom4j.io.XMLWriter xmlWriter = new org.dom4j.io.XMLWriter( new FileWriter(fileName)); xmlWriter.write(doc); xmlWriter.close(); } catch (Exception e) { System.out.println(e); } } public XMLWriter(OutputStream out) throws UnsupportedEncodingException { //System.out.println("In OutputStream"); this.format = DEFAULT_FORMAT; this.writer = createWriter(out, format.getEncoding()); this.autoFlush = true; namespaceStack.push(Namespace.NO_NAMESPACE); } public XMLWriter(OutputStream out, OutputFormat format) throws UnsupportedEncodingException { //System.out.println("In OutputStream,OutputFormat"); this.format = format; this.writer = createWriter(out, format.getEncoding()); this.autoFlush = true; namespaceStack.push(Namespace.NO_NAMESPACE); } /** * Get an OutputStreamWriter, use preferred encoding. */ protected Writer createWriter(OutputStream outStream, String encoding) throws UnsupportedEncodingException { return new BufferedWriter( new OutputStreamWriter( outStream, encoding ) ); } 由上面的代码我们可以看出dom4j对编码并没有进行什么很复杂的处理,完全通过java本身的功能来完成。所以我们在使用dom4j的来生成我们的XML文件时不应该直接为在构建XMLWriter时,不应该直接为其赋一个Writer对象,而应该通过一个OutputStream的子类对象来构建。也就是说在我们上面的代码中,不应该用FileWriter对象来构建xml文档,而应该使用FileOutputStream对象来构建所以将代码修改入下: Document doc = org.dom4j.DocumentHelper.createDocument(); Element root = doc.addElement("book"); root.addAttribute("name", "我的图书"); Element childTmp; childTmp = root.addElement("price"); childTmp.setText("21.22"); Element writer = root.addElement("author"); writer.setText("李四"); writer.addAttribute("ID", "001"); try { org.dom4j.io.XMLWriter xmlWriter = new org.dom4j.io.XMLWriter( new FileOutputStream(fileName)); xmlWriter.write(doc); xmlWriter.close(); } catch (Exception e) { System.out.println(e); } } |
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来自: bluecrystal > 《dom4j》