Android 中的 SAXParser 并将输出存储到数组中

Question

我是新的 Android 开发人员，我想在 php 中创建一个 Web 服务，我想调用该 Web 服务和该响应以获取数组并填充到列表中。

提供最好的用户交互请帮助解决这个问题

提前感谢

@androidTechs

Answer 1

这是一个可用于调用名为 WebService.java 的 Web 服务的类

package com.blessan;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.SocketTimeoutException;
import java.net.URLEncoder;
import java.util.ArrayList;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.conn.ConnectTimeoutException;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.HTTP;

public class WebService {

    private ArrayList <NameValuePair> params;
    private ArrayList <NameValuePair> headers;

    private String url;

    private int responseCode;
    private String message;

    private String response;

    public enum RequestMethod
    {
        GET,POST
    }

    public String getResponse() {
        return response;
    }

    public String getErrorMessage() {
        return message;
    }

    public int getResponseCode() {
        return responseCode;
    }

    public WebService(String url)
    {
        this.url = url;
        params = new ArrayList<NameValuePair>();
        headers = new ArrayList<NameValuePair>();
    }

    public void AddParam(String name, String value)
    {
        params.add(new BasicNameValuePair(name, value));
    }

    public void AddHeader(String name, String value)
    {
        headers.add(new BasicNameValuePair(name, value));
    }

    public void Execute(RequestMethod method) throws Exception
    {
        switch(method) {
            case GET:
            {
                //add parameters
                String combinedParams = "";
                if(!params.isEmpty()){
                    combinedParams += "?";
                    for(NameValuePair p : params)
                    {
                        String paramString = p.getName() + "=" + URLEncoder.encode(p.getValue(),"UTF-8");
                        if(combinedParams.length() > 1)
                        {
                            combinedParams  +=  "&" + paramString;
                        }
                        else
                        {
                            combinedParams += paramString;
                        }
                    }
                }

                HttpGet request = new HttpGet(url + combinedParams);

                //add headers
                for(NameValuePair h : headers)
                {
                    request.addHeader(h.getName(), h.getValue());
                }

                executeRequest(request, url);
                break;
            }
            case POST:
            {
                HttpPost request = new HttpPost(url);

                //add headers
                for(NameValuePair h : headers)
                {   
                    request.addHeader(h.getName(), h.getValue());
                }

                if(!params.isEmpty()){
                    request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
                }

                executeRequest(request, url);
                break;
            }
        }
    }

    private void executeRequest(HttpUriRequest request, String url) throws SocketTimeoutException, ConnectTimeoutException
    {
        HttpClient client = new DefaultHttpClient();
        HttpParams params = client.getParams();
        HttpConnectionParams.setConnectionTimeout(params, 10000);
        HttpConnectionParams.setSoTimeout(params, 10000);
        HttpResponse httpResponse;

        try {
            httpResponse = client.execute(request);
            responseCode = httpResponse.getStatusLine().getStatusCode();
            message = httpResponse.getStatusLine().getReasonPhrase();

            HttpEntity entity = httpResponse.getEntity();

            if (entity != null) {

                InputStream instream = entity.getContent();
                response = convertStreamToString(instream);

                // Closing the input stream will trigger connection release
                instream.close();
            }

        } catch (ClientProtocolException e)  {
            client.getConnectionManager().shutdown();
            e.printStackTrace();
        } catch(SocketTimeoutException e){
            client.getConnectionManager().shutdown();
            e.printStackTrace();
            throw new SocketTimeoutException();
        } catch(ConnectTimeoutException e){
            client.getConnectionManager().shutdown();
            e.printStackTrace();
            throw new ConnectTimeoutException();
        } catch (IOException e) {
            client.getConnectionManager().shutdown();
            e.printStackTrace();
        } catch (Exception e){
            client.getConnectionManager().shutdown();
            e.printStackTrace();
        }
    }

    private static String convertStreamToString(InputStream is) {

        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();

        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }
}

这是您在活动中使用它的方法

WebService webClient = new WebService(Constants.REQUEST_URL);
        webClient.AddParam("method", "getUserLogin");
        webClient.AddParam("key", Constants.REQUEST_KEY);
        webClient.AddParam("xml_content","<Request>"+
                                             "<Authentication>"+
                                                 "<Username>"+StringEscapeUtils.escapeXml(userName.getText().toString().trim())+"</Username>"+
                                                 "<Password>"+StringEscapeUtils.escapeXml(passWord.getText().toString().trim())+"</Password>"+
                                                 "<AccountID>"+appContext.getCurrentAccount().accId+"</AccountID>"+
                                             "</Authentication>"+
                                             appContext.getDeviceInfo()+
                                         "</Request>");

        try {           
            webClient.Execute(WebService.RequestMethod.POST);
            String response = webClient.getResponse();
            SAXParserFactory spf = SAXParserFactory.newInstance();
            SAXParser sp = spf.newSAXParser();
            XMLReader xr = sp.getXMLReader();
            GetUserLoginHandler getUserLoginHandler = new GetUserLoginHandler();
            xr.setContentHandler(getUserLoginHandler);            
            InputSource input = new InputSource(new StringReader(response));
            xr.parse(input);           

            serverResponse = getUserLoginHandler.getResults();
            handler.sendEmptyMessage(0);
        } catch(SocketTimeoutException e){
            errorHandler.sendEmptyMessage(0);
        } catch(ConnectTimeoutException e){
            errorHandler.sendEmptyMessage(0);
        } catch (Exception e) {
            if(e.toString().indexOf("ExpatParser$ParseException") != -1){
                errorHandler.sendEmptyMessage(1);   
            } else {    
                errorHandler.sendEmptyMessage(0);
            }
        }

GetUserLoginHandler 是一个处理程序，用于解析此请求的响应。

package com.blessan;

import java.util.HashMap;
import java.util.Map;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

public class GetUserLoginHandler extends DefaultHandler {
    private boolean in_statuscode    = false;
    private boolean in_statusmessage = false;
    private boolean in_userid        = false;
    private boolean in_username      = false;
    private boolean in_accountaccess = false;
    private boolean in_clockstatus   = false;
    private boolean in_timestamp     = false;
    private boolean in_depttransfer  = false;
    private boolean in_currdeptid    = false;
    private boolean in_currdeptname  = false;
    private Map<String, String> results         =   new HashMap<String, String>();

    @Override
    public void endDocument() throws SAXException {
    }

    @Override
    public void startElement(String namespaceURI, String localName,String qName, Attributes atts) throws SAXException {
        if (localName.equals("StatusCode")) {
            this.in_statuscode    = true;
        } else if (localName.equals("StatusMessage")) {
            this.in_statusmessage = true;
        } else if (localName.equals("UserId")) {
            this.in_userid        = true;
        } else if (localName.equals("UserName")) {
            this.in_username      = true;
        } else if (localName.equals("AccountAccess")) {
            this.in_accountaccess = true;
        } else if (localName.equals("ClockStatus")) {
            this.in_clockstatus   = true;
        } else if (localName.equals("Timestamp")) {
            this.in_timestamp     = true;
        } else if (localName.equals("DepartmentTransfer")) {
            this.in_depttransfer  = true;
        } else if (localName.equals("CurrentDepartmentID")) {
            this.in_currdeptid    = true;
        } else if (localName.equals("CurrentDepartmentName")) {
            this.in_currdeptname  = true;
        }
    }

    @Override
    public void endElement(String namespaceURI, String localName, String qName) throws SAXException {
        if (localName.equals("StatusCode")) {
            this.in_statuscode    = false;
        } else if (localName.equals("StatusMessage")) {
            this.in_statusmessage = false;
        } else if (localName.equals("UserId")) {
            this.in_userid        = false;
        } else if (localName.equals("UserName")) {
            this.in_username      = false;
        } else if (localName.equals("AccountAccess")) {
            this.in_accountaccess = false;
        } else if (localName.equals("ClockStatus")) {
            this.in_clockstatus   = false;
        } else if (localName.equals("Timestamp")) {
            this.in_timestamp     = false;
        } else if (localName.equals("DepartmentTransfer")) {
            this.in_depttransfer  = false;
        } else if (localName.equals("CurrentDepartmentID")) {
            this.in_currdeptid    = false;
        } else if (localName.equals("CurrentDepartmentName")) {
            this.in_currdeptname  = false;
        }
    }

    @Override
    public void characters(char ch[], int start, int length) {
        if (this.in_statuscode) {
            results.put("StatusCode", new String(ch, start, length));
        } if (this.in_statusmessage) {
            results.put("StatusMessage", new String(ch, start, length));
        } if (this.in_userid) {
            results.put("UserId", new String(ch, start, length));
        } if (this.in_username) {
            results.put("UserName", new String(ch, start, length));
        } if (this.in_accountaccess) {
            results.put("AccountAccess", new String(ch, start, length));
        } if (this.in_clockstatus) {
            results.put("ClockStatus", new String(ch, start, length));
        } if (this.in_timestamp) {
            results.put("Timestamp", new String(ch, start, length));
        } if (this.in_depttransfer) {
            results.put("DepartmentTransfer", new String(ch, start, length));
        } if (this.in_currdeptid) {
            results.put("CurrentDepartmentID", new String(ch, start, length));
        } if (this.in_currdeptname) {
            results.put("CurrentDepartmentName", new String(ch, start, length));
        }
    }

    public Map<String, String> getResults(){
        return results;
    }
}

这只是一个例子。有很多教程详细解释了 SAX 解析。