XML file creation Apache server has been established in the last introduced, where no more than elaborate
text:
Add the jar package
implementation 'com.squareup.okhttp3:okhttp:3.4.1'
Apply for network permissions in the closure
<uses-permission android:name="android.permission.INTERNET"/>
There is only a Button in the layout file, which will not be explained here. The parsed XML data will be reflected in the log mode.
Create a ContentHandler class and inherit the DefaultHandler class, and rewrite the 5 methods of the parent class
ContentHandler.java. The code is as follows:
public class ContentHandler extends DefaultHandler {
private String nodeName;
private StringBuilder id;
private StringBuilder name;
private StringBuilder version;
//开始解析XML文件
@Override
public void startDocument() throws SAXException {
super.startDocument();
id = new StringBuilder();
name = new StringBuilder();
version = new StringBuilder();
}
//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);
nodeName = localName;
}
//获取某个节点的内容
@Override
public void characters(char[] ch, int start, int length) throws SAXException {
super.characters(ch, start, length);
if ("id".equals(nodeName)){
id.append(ch, start, length);
}else if ("name".equals(nodeName)){
name.append(ch, start, length);
}else if ("version".equals(nodeName)){
version.append(ch, start, length);
}
}
//完成某个节点解析
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
super.endElement(uri, localName, qName);
if ("app".equals(nodeName)) {
Log.d("ID = ", id.toString().trim());
Log.d("Name = ", name.toString().trim());
Log.d("Version = ", version.toString().trim());
//清空StringBuilder
id.setLength(0);
name.setLength(0);
version.setLength(0);
}
}
//完成整个XML文件解析
@Override
public void endDocument() throws SAXException {
super.endDocument();
}
}
The MainActivity.java code is as follows:
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private Button SendRequest;
private TextView ResponseText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SendRequest = (Button) findViewById(R.id.SendRequest);
ResponseText = (TextView)findViewById(R.id.Response);
SendRequest.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (v.getId() == R.id.SendRequest){
SendRequestToOkhttp();
}
}
private void SendRequestToOkhttp() {
new Thread(new Runnable() {
@Override
public void run() {
try {
OkHttpClient Client = new OkHttpClient();
//本机ip地址
Request request = new Request.Builder().url("http://192.168.0.60:8888/data.xml").build();//发送请求
Response response = Client.newCall(request).execute();//发送请求并获取服务器返回的数据
String ResponseData = response.body().string();//获取具体数据
ParseXMLWithSAX(ResponseData);//显示数据
} catch (Exception e) {
e.printStackTrace();
}
}
}).start();
}
private void ParseXMLWithSAX(String XMLData){
try{
SAXParserFactory factory = SAXParserFactory.newInstance();//获取SAXParserFactory实例
XMLReader xmlReader = factory.newSAXParser().getXMLReader();
ContentHandler handler = new ContentHandler();
xmlReader.setContentHandler(handler);
//开始解析
xmlReader.parse(new InputSource(new StringReader(XMLData)));
}catch (Exception e){
e.printStackTrace();
}
}
}