Loads saved java object from XML file via JAXB - Java XML

Java examples for XML:JAXB

  1. HOME
  2. Java
  3. XML
  4. JAXB

Description

Loads saved java object from XML file via JAXB

Demo Code

/**/* w  w w  .j  a va2s .com*/
 *  Copyright 2009 Welocalize, Inc. 
 *  
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  
 *  You may obtain a copy of the License at 
 *  http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *  
 */
//package com.java2s;
import java.io.FileReader;

import java.io.IOException;

import javax.xml.bind.JAXBContext;

import javax.xml.bind.Unmarshaller;

public class Main {
    public static void main(String[] argv) throws Exception {
        Class clazz = String.class;
        String file = "java2s.com";
        System.out.println(load(clazz, file));
    }

    /**
     * Loads saved java object from <code>file</code>.
     * 
     * @param <T>
     *            The class of object. Can't be null.
     * @param clazz
     *            The class of object. Can't be null.
     * @param file
     *            The xml file to load. Can't be null and must exist.
     * @return The loaded object.
     */
    @SuppressWarnings("unchecked")
    public static <T> T load(Class<T> clazz, String file) {
        FileReader fr = null;
        T ob = null;
        try {
            JAXBContext context = JAXBContext.newInstance(clazz);
            Unmarshaller um = context.createUnmarshaller();
            fr = new FileReader(file);
            ob = (T) um.unmarshal(fr);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (fr != null) {
                try {
                    fr.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        return ob;
    }
}

Related Tutorials