JSON XML IO數據操作

一、XML解析

通過繼承org.xml.sax.helpers.DefaultHandler類，覆寫characters(),startDocument(),startElement(),endElement()方法實現讀取

characters() --------讀取結點中的字段值

startDocument()------------進行讀取的初始化

startElement()-------------為每次讀取初始化

endElement()------------實現讀取功能

以下是實現解析功能的源代碼：

package org.hjw.service;

import java.util.ArrayList;
import java.util.List;

import org.hjw.model.Product;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class XML2Product extends DefaultHandler {
private Product product;
private List<Product> products;
StringBuffer buffer = new StringBuffer();

public List<Product> getProducts() {
return products;
}

@Override
public void characters(char[] ch, int start, int length)
throws SAXException {
buffer.append(ch, start, length);
super.characters(ch, start, length);
}

@Override
public void startDocument() throws SAXException {
products = new ArrayList<Product>();
}

@Override
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
if (localName.equals("product")) {
product = new Product();
}
super.startElement(uri, localName, qName, attributes);
}

@Override
public void endElement(String uri, String localName, String qName)
throws SAXException {
if (localName.equals("product")) {
products.add(product);
} else if (localName.equals("id")) {
product.setId(Integer.parseInt(buffer.toString().trim()));
buffer.setLength(0);
} else if (localName.equals("name")) {
product.setName(buffer.toString().trim());
buffer.setLength(0);
} else if (localName.equals("price")) {
product.setPrice(Float.parseFloat(buffer.toString().trim()));
buffer.setLength(0);
}
super.endElement(uri, localName, qName);
}

}

然後只需在主函數中：

InputStream is = getResources().openRawResource(R.raw.products);
XML2Product xml2Product = new XML2Product();
Android.util.Xml.parse(is, Xml.Encoding.UTF_8, xml2Product);
List<Product> products = xml2Product.getProducts();

打開輸入流，通過工具類分析xml文件即可獲得一個ArrayList類型的集合，然後實現解析功能。

Android JSON解析 http://www.linuxidc.com/Linux/2012-09/70928.htm

Android解析JSON方式 http://www.linuxidc.com/Linux/2013-03/80300.htm

Android 解析JSON數據格式 http://www.linuxidc.com/Linux/2013-01/78016.htm