本文实例为大家分享了java操作xml工具类的具体代码，供大家参考，具体内容如下
一、代码
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public class xmlutil { /** * 将xml文件输出到指定的路径 * * @param doc * @param filename * @throws exception */ public static void outputxml(document doc, string filename) throws exception { transformerfactory tf = transformerfactory.newinstance(); transformer transformer = tf.newtransformer(); domsource source = new domsource(doc); transformer.setoutputproperty(outputkeys.encoding, "utf-8" ); transformer.setoutputproperty(outputkeys.indent, "yes" ); printwriter pw = new printwriter( new fileoutputstream(filename)); streamresult result = new streamresult(pw); transformer.transform(source, result); system.out.println( "生成xml文件成功!" ); }
/** * 生成xml * * @param ip * @return */ public static document generatexml(string ip) { document doc = null ; element root = null ; try { documentbuilderfactory factory = documentbuilderfactory .newinstance(); documentbuilder builder = factory.newdocumentbuilder(); doc = builder.newdocument(); root = doc.createelement( "errordevices" ); doc.appendchild(root); } catch (exception e) { e.printstacktrace(); return null ; // 如果出现异常，则不再往下执行 }
element element; element = doc.createelement( "errordevice" ); element.setattribute( "ip" , ip); element.setattribute( "date" , stringutil.formatdate( new date(), "yyyy-mm-dd hh:mm:ss" )); element.setattribute( "status" , "1" ); root.appendchild(element); return doc; }
/** * 新增xml节点 * * @param ip * @param filename * @return * @throws filenotfoundexception * @throws transformerexception */ public static void towrite(string filename, string ip) throws filenotfoundexception, transformerexception { string date = stringutil.formatdate( new date(), "yyyy-mm-dd hh:mm:ss" ); documentbuilderfactory factory = documentbuilderfactory.newinstance(); documentbuilder builder = null ; document doc = null ; try { builder = factory.newdocumentbuilder(); doc = builder.parse( new file(filename)); } catch (parserconfigurationexception e) { e.printstacktrace(); } catch (saxexception e) { e.printstacktrace(); } catch (ioexception e) { e.printstacktrace(); } nodelist links = doc.getelementsbytagname( "errordevice" ); if (links.getlength() > 0 ) { for ( int i = 0 ; i < links.getlength(); i++) { node nd = links.item(i); node catparent = nd.getparentnode(); element ele = (element) nd; string url = ele.getattribute( "ip" ); if (url.equals(ip)) { // ele.setattribute("date", date); catparent.removechild(nd); } } } element element = doc.createelement( "errordevice" ); element.setattribute( "ip" , ip); element.setattribute( "date" , stringutil.formatdate( new date(), "yyyy-mm-dd hh:mm:ss" )); element.setattribute( "status" , "1" ); doc.getdocumentelement().appendchild(element); transformerfactory tf = transformerfactory.newinstance(); transformer transformer = tf.newtransformer(); domsource source = new domsource(doc); transformer.setoutputproperty(outputkeys.encoding, "utf-8" ); transformer.setoutputproperty(outputkeys.indent, "yes" ); printwriter pw = new printwriter( new fileoutputstream(filename)); streamresult result = new streamresult(pw); transformer.transform(source, result); system.out.println( "新增xml节点成功!" ); }
/** * 读取xml * * @param filename * @return */ public static list<map> readxml(string filename){ documentbuilderfactory factory = documentbuilderfactory.newinstance(); documentbuilder builder = null ; document doc = null ; try { builder = factory.newdocumentbuilder(); doc = builder.parse( new file(filename)); } catch (parserconfigurationexception e) { e.printstacktrace(); } catch (saxexception e) { e.printstacktrace(); } catch (ioexception e) { e.printstacktrace(); } nodelist links = doc.getelementsbytagname( "errordevice" ); list<map> list = new arraylist<map>(); for ( int i = 0 ; i< links.getlength() ; i ++){ element node = (element)links.item(i); map map = new hashmap(); map.put(node.getattribute( "ip" ), node.getattribute( "date" )); list.add(map); } return list; } } |
二、演示xml
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<?xml version= "1.0" encoding= "utf-8" standalone= "no" ?> <errordevices> <errordevice date= "2017-03-13 12:54:16" ip= "20.100.156.42" status= "1" /> <errordevice date= "2017-03-13 12:54:56" ip= "20.100.156.41" status= "1" /> </errordevices> |
三、最终效果图
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
原文链接：https://blog.csdn.net/u010823625/article/details/61920159
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