jsp 增加，删除，读取xml文件中指定标记的内容代码

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package xml;

import java.io.file;
import java.util.list;

import org.dom4j.document;
import org.dom4j.documentexception;
import org.dom4j.element;
import org.dom4j.qname;
import org.dom4j.io.saxreader;

public class dom4jtest {

    private saxreader reader;
    private document document;
    private static string path = "c:/dom4jsample1.xml";

    public dom4jtest(string str) throws documentexception {
        reader = new saxreader();
        document = reader.read(new file(str));
    }

    public static void main(string[] args) throws documentexception {
        // todo auto-generated method stub
        dom4jtest test = new dom4jtest(path);   
        test.getinfo();

    }

    public void getinfo() {
        element root = document.getrootelement();

        qname qname = new qname("ip");
        list<element> list = root.elements(qname);

        for (int i = 0; i < list.size(); i++) {
            system.out.println(list.get(i).gettext());
        }

    }

}

public void add(string add) throws ioexception {
 element root = document.getrootelement();
 element e = root.addelement("ip");
 e.settext(add);
 writefile(document);
}

    // 写入文件
private void writefile(document doc) throws ioexception {
 filewriter out = new filewriter(path);
 doc.write(out);
 out.flush();
 out.close();
}