11.10 Map

xml/Person.java

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+//: xml/Person.java
+// Use the XOM library to write and read XML
+// {Requires: nu.xom.Node; You must install
+// the XOM library from http://www.xom.nu }
+import nu.xom.*;
+import java.io.*;
+import java.util.*;
+
+public class Person {
+  private String first, last;
+  public Person(String first, String last) {
+    this.first = first;
+    this.last = last;
+  }
+  // Produce an XML Element from this Person object:
+  public Element getXML() {
+    Element person = new Element("person");
+    Element firstName = new Element("first");
+    firstName.appendChild(first);
+    Element lastName = new Element("last");
+    lastName.appendChild(last);
+    person.appendChild(firstName);
+    person.appendChild(lastName);
+    return person;
+  }
+  // Constructor to restore a Person from an XML Element:
+  public Person(Element person) {
+    first= person.getFirstChildElement("first").getValue();
+    last = person.getFirstChildElement("last").getValue();
+  }
+  public String toString() { return first + " " + last; }
+  // Make it human-readable:
+  public static void
+  format(OutputStream os, Document doc) throws Exception {
+    Serializer serializer= new Serializer(os,"ISO-8859-1");
+    serializer.setIndent(4);
+    serializer.setMaxLength(60);
+    serializer.write(doc);
+    serializer.flush();
+  }
+  public static void main(String[] args) throws Exception {
+    List<Person> people = Arrays.asList(
+      new Person("Dr. Bunsen", "Honeydew"),
+      new Person("Gonzo", "The Great"),
+      new Person("Phillip J.", "Fry"));
+    System.out.println(people);
+    Element root = new Element("people");
+    for(Person p : people)
+      root.appendChild(p.getXML());
+    Document doc = new Document(root);
+    format(System.out, doc);
+    format(new BufferedOutputStream(new FileOutputStream(
+      "People.xml")), doc);
+  }
+} /* Output:
+[Dr. Bunsen Honeydew, Gonzo The Great, Phillip J. Fry]
+<?xml version="1.0" encoding="ISO-8859-1"?>
+<people>
+    <person>
+        <first>Dr. Bunsen</first>
+        <last>Honeydew</last>
+    </person>
+    <person>
+        <first>Gonzo</first>
+        <last>The Great</last>
+    </person>
+    <person>
+        <first>Phillip J.</first>
+        <last>Fry</last>
+    </person>
+</people>
+*///:~