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;
}
}
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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>
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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服务器之家。
原文链接：https://blog.csdn.net/u010823625/article/details/61920159