救急 关于JDOM生成XML的问题

[tdy1234]

小弟使用JDOM 生成一个XML 文件中间有一个标签如<BNIF seqno="1">这样，后面是一个属性 标识该字段在本文件中的编号 如seqno="1"，seqno="2"，seqno="3"这样，请各位大大指点这个属性用JDOM 的什么方法写入 完成就结帖

[lindazch]

友情支援

[yifengtpf]

addAttribute("属性名"，"值") ;

[ssrwf]

Jdom的用法：
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;
public class StudentDAO {
String file;//xml文件的位置
FileOutputStream fo;
Document doc;
SAXBuilder builder = new SAXBuilder();
Format format; //用于设置xml文件的格式
private StudentDAO() {
}
//构造函数中设置file和format
public StudentDAO(String webroot) {
file = webroot + "/data/student.xml";
format = Format.getPrettyFormat();
format.setIndent(" ");
format.setEncoding("utf-8");
}
//向xml文件中添加一条记录
public boolean add(StudentInfo si) {
String id = si.getId();
boolean idAlreadyExisted = false;
boolean addResult = false;
Element root;
List allStudent;
try { doc = builder.build(file);
root = doc.getRootElement();
allStudent = root.getChildren();
//检查要添加的信息是否存在
for (int i = 0; i < allStudent.size(); i++) {
Element element = (Element) allStudent.get(i);
if (element.getChild("id").getText().equals(id)) {
idAlreadyExisted = true;
break;
}
}
//向xml文件中添加新的信息，并返回true
if (!idAlreadyExisted) {
Element student = new Element("student");
student.addContent(new Element("id").setText(si.getId()));
student.addContent(new Element("name").setText(si.getName()));
student.addContent(new Element("birthday").setText(si
.getBirthday()));
student.addContent(new Element("address").setText(si
.getAddress()));
allStudent.add(student);
XMLOutputter xout = new XMLOutputter(format);
fo = new FileOutputStream(file);
xout.output(doc, fo);
return true;
}

} catch (JDOMException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
close();
}
return addResult;
}
//从xml文件中删除一条信息
public boolean del(String id) {
boolean delResult = false;
Element root;
List allStudent;
try {
doc = builder.build(file);
root = doc.getRootElement();
allStudent = root.getChildren();
for (int i = 0; i < allStudent.size(); i++) {
Element student = (Element) allStudent.get(i);
//如果id存在，则删除些条信息，并返回true
if (student.getChild("id").getText().equals(id)) {
allStudent.remove(i);
XMLOutputter xout = new XMLOutputter(format);
fo = new FileOutputStream(file);
xout.output(doc, fo);
return true;
}
}

} catch (JDOMException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
close();
}
return delResult;
}
//按名字进行查询，返回所有名字以name开头的记录
public ArrayList query(String name) {
ArrayList list = new ArrayList();
Element root;
List allStudent;
try {
doc = builder.build(file);
root = doc.getRootElement();
allStudent = root.getChildren();

for (int i = 0; i < allStudent.size(); i++) {
Element student = (Element) allStudent.get(i);
if (student.getChild("name").getText().startsWith(name)) {
StudentInfo si = new StudentInfo();
si.setId(student.getChild("id").getText());
si.setName(student.getChild("name").getText());
si.setBirthday(student.getChild("birthday").getText());
si.setAddress(student.getChild("address").getText());
list.add(si);
}
}
} catch (JDOMException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return list;
}
void close() {
if (fo != null) {
try {
fo.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

[zjf405]

Element elem = new Element("BNIF");
elem.setAttribute(new Attribute("seqno", "1"));

[yifengtpf]

楼上的这个JDOM解析XML文档 不能有个普遍作用
只能用于解析 只有2级目录的
如果有3级甚至更多就行不通了
建议使用递归

[Gerry-Zhang]

jdom 解析xml