dom4可以读取和添加xml文件的属性或者元素
读取属性:
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public static void readattributes() throws documentexception {
file file = new file("d:\\cmz\\java\\xmltest\\customertest.xml");
saxreader reader = new saxreader();
document doc = reader.read(file);
element root = doc.getrootelement();
try {
for (iterator iterator = root.elementiterator(); iterator.hasnext();) {
element element = (element) iterator.next();
string customerid = element.attributevalue("customerid");
system.out.println("customerid = " + customerid);
string companyname = element.attributevalue("companyname");
system.out.println("companyname = " + companyname);
system.out.println("contactname = "
+ element.attributevalue("contactname"));
system.out.println("contacttitle = "
+ element.attributevalue("contacttitle"));
system.out.println("address = "
+ element.attributevalue("address"));
system.out.println("city = " + element.attributevalue("cit阿y"));
system.out.println("postalcode = "
+ element.attributevalue("postalcode"));
system.out.println("country = "
+ element.attributevalue("country"));
system.out
.println("phone = " + element.attributevalue("phone"));
system.out.println("fax = " + element.attributevalue("fax"));
system.out
.println("--------------------------------------------------------\t");
}
} catch (exception e) {
// todo: handle exception
}
}
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读取元素:
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public static void readinnertest() throws documentexception {
file file = new file("d:\\cmz\\java\\xmltest\\customer1.xml");
saxreader reader = new saxreader();
document doc = reader.read(file);
element root = doc.getrootelement();
try {
for (iterator iterator = root.elementiterator(); iterator.hasnext();) {
element type = (element) iterator.next();
system.out.println(type.elementtext("customerid"));
system.out.println(type.elementtext("companyname"));
system.out.println(type.elementtext("contactname"));
system.out.println(type.elementtext("contacttitle"));
system.out.println(type.elementtext("address"));
system.out.println(type.elementtext("city"));
system.out.println(type.elementtext("postalcode"));
system.out.println(type.elementtext("country"));
system.out.println(type.elementtext("phone"));
system.out.println(type.elementtext("fax"));
system.out.println("---------------------------------\t");
}
} catch (exception e) {
// todo: handle exception
}
}
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写入属性:
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public static void writeattributes() {
document doc = documenthelper.createdocument();
element ele = doc.addelement("table");
for (int i = 1; i < 5; i++) {
element customers = ele.addelement("customers");
customers.addattribute("customerid", "alfki" + i);
customers.addattribute("companyname", "alfreds futterkiste" + i);
customers.addattribute("contactname", "maria anders" + i);
customers.addattribute("contacttitle", "sales representative" + i);
customers.addattribute("address", "obere str. 57");
customers.addattribute("city", "beijin");
customers.addattribute("postalcode", "12209");
customers.addattribute("country", "germany");
customers.addattribute("phone", "030-0074321");
customers.addattribute("fax", "030-0076545");
try {
xmlwriter writer = new xmlwriter(new filewriter(new file(
"customertest.xml")));
writer.write(doc);
writer.close();
} catch (exception e) {
// todo: handle exception
}
}
}
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写出元素:
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public static void writeinnertest(){
document doc = documenthelper.createdocument();
element ele = doc.addelement("table");
for (int i = 1; i < 5; i++) {
element customers = ele.addelement("row");
element customerid = ele.addelement("customerid");
customerid.settext("alfki" + i);
element companyname = ele.addelement("companyname");
companyname.settext("alfreds futterkiste" + i);
element contactname = ele.addelement("contactname");
contactname.settext("maria anders" + i);
element contacttitle = ele.addelement("contacttitle");
contacttitle.settext("sales representative" + i);
element address = ele.addelement("address");
address.settext("obere str. 57");
element city = ele.addelement("city");
city.settext("beijin");
element postalcode = ele.addelement("postalcode");
postalcode.settext("12209");
element country = ele.addelement("country");
country.settext("germany");
element phone = ele.addelement("phone");
phone.settext("030-0074321");
element fax = ele.addelement("fax");
fax.settext("030-0076545");
}
try {
xmlwriter writer = new xmlwriter(new filewriter(new file(
"customertest2.xml")));
writer.write(doc);
writer.close();
} catch (exception e) {
// todo: handle exception
}
}
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可以修改属性的文本内容:
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public static void readupdateattribute() throws documentexception{
file file = new file("d:\\cmz\\java\\xmltest\\customertest.xml");
saxreader reader = new saxreader();
document doc = reader.read(file);
element root = doc.getrootelement();
try {
for (iterator iterator = root.elementiterator("customers"); iterator.hasnext();) {
element element = (element) iterator.next();
string name = "alfki1";
if (name.equals(element.attributevalue("customerid")) ) {
attribute attr = element.attribute("customerid");
attr.setvalue("234");
element contactname = element.addelement("23424");
contactname.settext("676767" );
}
}
xmlwriter writer = new xmlwriter(new fileoutputstream(file));
writer.write(doc);
readattributes();
} catch (exception e) {
// todo: handle exception
}
}
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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://www.cnblogs.com/chengmuzhe/p/10127895.html