Android中对XML和JSON数据解析的方法汇总

就目前来讲，在 Android 开发中，还是以 JSON 格式数据较为常见，但偶尔还是会碰到需要在项目中使用 XML 格式数据的情况，这篇文章总结了几种常见的解析 XML 和 JSON 数据的用法

XML解析

<apps>        <app>            <id>111</id>            <city>江西</city>            <weather>阴转晴</weather>        </app>        <app>            <id>222</id>            <city>湖南</city>            <weather>雨夹雪</weather>        </app>    </apps>

Pull解析XML

private void parseXMLWithPull(String xmlData) {        try {            XmlPullParserFactory factory = XmlPullParserFactory.newInstance();            XmlPullParser pullParser = factory.newPullParser();            pullParser.setInput(new StringReader(result));            int eventType = pullParser.getEventType();            final StringBuilder sb = new StringBuilder();            while (eventType != XmlPullParser.END_DOCUMENT) {                String nodeName = pullParser.getName();                switch (eventType) {                    case XmlPullParser.START_TAG: {                        if ("id".equals(nodeName)) {                            sb.append(pullParser.nextText());                        } else if ("city".equals(nodeName)) {                           sb.append(pullParser.nextText());                        } else if ("weather".equals(nodeName)) {                            sb.append(pullParser.nextText());                            sb.append("\n");                        }                        break;                    }                    case XmlPullParser.END_TAG:{                        if ("app".equals(nodeName)) {                            runOnUiThread(new Runnable() {                                    mTextView.setText(sb.toString());//在主线程中更新UI                                }                            });                        }                        break;                    }                    default:                        break;                }                eventType = pullParser.next();            }        } catch (XmlPullParserException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }

SAX解析XML

private void parseXMLWithSAX(String xmlData) {        try {            SAXParserFactory factory = SAXParserFactory.newInstance();            XMLReader xmlReader = factory.newSAXParser().getXMLReader();            //通过获取到的InputStream来得到InputSource实例            InputSource inputSource = new InputSource(new StringReader(xmlData));            //初始化自定义的类MyXMLParserHandler，将mList传递给它，以便装载数据            xmlReader.setContentHandler(new MyXMLParserHandler(mList));//之前要定义并初始化            xmlReader.parse(inputSource);        } catch (SAXException e) {            e.printStackTrace();        } catch (ParserConfigurationException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }

自定义MyXMLParserHandler类（BeanItem对象用来装载值）

public class MyXMLParserHandler extends DefaultHandler {        //声明一个字符串变量        private String content;        //声明一个装载Beauty类型的List        private List<BeanItem> mList;        private BeanItem beanItem;        public MyXMLParserHandler(List<BeanItem> mList) {            this.mList = mList;        }        @Override        public void startDocument() throws SAXException {            super.startDocument();        }        //开始解析某个节点        @Override        public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {            super.startElement(uri, localName, qName, attributes);            if ("app".equals(localName)) {                beanItem = new BeanItem();            }        }        //当SAX解析器解析到某个属性值时，会调用的方法，其中参数ch记录了这个属性值的内容        @Override        public void characters(char[] ch, int start, int length) throws SAXException {            super.characters(ch, start, length);            content = new String(ch,start,length);        }        //当SAX解析器解析到某个元素结束时，会调用的方法，其中localName记录的是元素属性名        @Override        public void endElement(String uri, String localName, String qName) throws SAXException {            super.endElement(uri, localName, qName);            if ("id".equals(localName)) {                beanItem.setId(content);            } else if ("city".equals(localName)) {                beanItem.setCity(content);            } else if ("weather".equals(localName)) {                beanItem.setWeather(content);            } else if ("app".equals(localName)) {                mList.add(beanItem);            }        }        //完成整个XML解析时调用        @Override        public void endDocument() throws SAXException {            super.endDocument();        }    }

DOM解析XML(Android不推荐)

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解析JSON数据

[      {"id":"5","version":"5.5","name":"Angry Birds"},    {"id":"6","version":"7.0","name":"Clash of Clans"},    {"id":"7","version":"3.5","name":"Hey Day"}]

• JSONObject解析

 private void parseJSONWithJSONObject(String jsonData) {    try {            JSONArray jsonArray = new JSONArray(jsonData);            for (int i = 0; i < jsonArray.length(); i++) {                JSONObject jsonObject = jsonArray.getJSONObject(i);                String id = jsonObject.getString("id");                String name = jsonObject.getString("name");                String version = jsonObject.getString("version");            }    } catch (Exception e) {        e.printStackTrace();    }}

• GSON解析

private void parseJSONWithGSON(String jsonData) {    Gson gson = new Gson();    List<ItemBean> itemList = gson.fromJson(jsonData, newTypeToken<List<ItemBean>>() {}.getType());//ItemBean是吧JSON数据的id,version,name封装成了一个对象    for (ItemBean item : itemList) {        Log.d("MainActivity", "id is " + item.getId());        Log.d("MainActivity", "name is " + item.getName());        Log.d("MainActivity", "version is " + item.getVersion());    }}

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