我正在尝试创建一个Twitter用户列表,用用户的关注者数量和他们的个人资料图片填充它。由于Twitter的API,您需要在使用REST API之前获取应用程序的访问令牌。我认为最好的方法是通过Java和托管bean。我发布了下面的代码,目前有效。我从Twitter获取访问令牌,然后进行API调用以获取用户信息,该信息是JSON。
我的问题是,解析JSON并迭代用户名列表以在XPage上创建表/网格的最佳方法是什么?
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Serializable;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import javax.net.ssl.HttpsURLConnection;
import org.apache.commons.codec.binary.Base64;
import org.json.simple.JSONObject;
import org.json.simple.JSONValue;
public class TwitterUser implements Serializable {
private static final String consumerKey = "xxxx";
private static final String consumerSecret = "xxxx";
private static final String twitterApiUrl = "https://api.twitter.com";
private static final long serialVersionUID = -2084825539627902622L;
private static String accessToken;
private String twitUser;
public TwitterUser() {
this.twitUser = null;
}
public String getTwitterUser(String screenName) {
try {
this.requestTwitterUserInfo(screenName);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return twitUser;
}
public void setTwitterUser() {
twitUser = twitUser;
}
//Encodes the consumer key and secret to create the basic authorization key
private static String encodeKeys(String consumerKey, String consumerSecret) {
try {
String encodedConsumerKey = URLEncoder.encode(consumerKey, "UTF-8");
String encodedConsumerSecret = URLEncoder.encode(consumerSecret, "UTF-8");
String fullKey = encodedConsumerKey + ":" + encodedConsumerSecret;
byte[] encodedBytes = Base64.encodeBase64(fullKey.getBytes());
return new String(encodedBytes);
}
catch (UnsupportedEncodingException e) {
return new String();
}
}
//Constructs the request for requesting a bearer token and returns that token as a string
private static void requestAccessToken() throws IOException {
HttpsURLConnection connection = null;
String endPointUrl = twitterApiUrl + "/oauth2/token";
String encodedCredentials = encodeKeys(consumerKey,consumerSecret);
String key = "";
try {
URL url = new URL(endPointUrl);
connection = (HttpsURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestMethod("POST");
connection.setRequestProperty("Host", "api.twitter.com");
connection.setRequestProperty("User-Agent", "Your Program Name");
connection.setRequestProperty("Authorization", "Basic " + encodedCredentials);
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
connection.setRequestProperty("Content-Length", "29");
connection.setUseCaches(false);
writeRequest(connection, "grant_type=client_credentials");
// Parse the JSON response into a JSON mapped object to fetch fields from.
JSONObject obj = (JSONObject)JSONValue.parse(readResponse(connection));
if (obj != null) {
String tokenType = (String)obj.get("token_type");
String token = (String)obj.get("access_token");
accessToken = ((tokenType.equals("bearer")) && (token != null)) ? token : "";
}
else {
accessToken = null;
}
}
catch (MalformedURLException e) {
throw new IOException("Invalid endpoint URL specified.", e);
}
finally {
if (connection != null) {
connection.disconnect();
}
}
}
private void requestTwitterUserInfo(String sn) throws IOException {
HttpsURLConnection connection = null;
if (accessToken == null) {
requestAccessToken();
}
String count = "";
try {
URL url = new URL(twitterApiUrl + "/1.1/users/show.json?screen_name=" + sn);
connection = (HttpsURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestMethod("GET");
connection.setRequestProperty("Host", "api.twitter.com");
connection.setRequestProperty("User-Agent", "Your Program Name");
connection.setRequestProperty("Authorization", "Bearer " + accessToken);
connection.setRequestProperty("Content-Type", "text/plain");
connection.setUseCaches(false);
}
catch (MalformedURLException e) {
throw new IOException("Invalid endpoint URL specified.", e);
}
finally {
if (connection != null) {
connection.disconnect();
}
}
twitUser = readResponse(connection);
}
//Writes a request to a connection
private static boolean writeRequest(HttpsURLConnection connection, String textBody) {
try {
BufferedWriter wr = new BufferedWriter(new OutputStreamWriter(connection.getOutputStream()));
wr.write(textBody);
wr.flush();
wr.close();
return true;
}
catch (IOException e) { return false; }
}
// Reads a response for a given connection and returns it as a string.
private static String readResponse(HttpsURLConnection connection) {
try {
StringBuilder str = new StringBuilder();
BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line = "";
while((line = br.readLine()) != null) {
str.append(line + System.getProperty("line.separator"));
}
return str.toString();
}
catch (IOException e) { return new String(); }
}
}
答案 0 :(得分:2)
一些指示: