為 GET 請求使用 Liferay JSON 服務

Liferay 通過 JSON 公開了許多其他系統可用的預設和自定義服務。要探索特定 liferay 例項上的服務，請使用給定的 URL - 在這種情況下為本地例項：

http://localhost:8080/api/jsonws/

選擇所需的服務，使用給定語法和引數的服務：

/user/get-user-by-email-address

使用 companyId and emailAddress 檢索具有預期資料型別的使用者，以及消費者可能處理的異常。

以下示例從 portlet 使用此服務。給定的實用程式類方法呼叫 webservice，傳遞必要的引數：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

import sun.misc.BASE64Encoder;

import com.liferay.portal.kernel.util.StringUtil;
import com.liferay.portal.theme.ThemeDisplay;

public class WebServiceUtil {

public static String requestWebService(ThemeDisplay themeDisplay) {
    
    String url="http://localhost:8080/api/jsonws/user/get-user-by-email-address/company-id/{company-id}/email-address/{email-address}";
    
    String groupId= Long.toString(themeDisplay.getCompanyId());
    String userEmail="test@liferay.com";
    
    String[] searchList={"{company-id}","{email-address}"};
    String[] replList={groupId,userEmail};

    //Path params are replaced with args to make web service call
    url=StringUtil.replace(url, searchList, replList);
    
    System.out.println(url);
    StringBuilder sb = new StringBuilder();
    JSONObject jsonObject=new JSONObject();
    try
    {
        URL urlVal = new URL(url);
        HttpURLConnection conn = (HttpURLConnection) urlVal.openConnection();
        
        //The user credentials are directly used here only for the purpose of example,always fetech these details from an external props file.
        
        String uname ="test@liferay.com";
        String pswd="test";
        String authStr=uname+":"+pswd;
        
        //Encoding username+pswd to be added to request header for making web service             call
        String authStrEnc=new BASE64Encoder().encode(authStr.getBytes());

        /*Authorization type is set to consume web service
        and encoded combination is set in header to autheticate caller*/

        conn.setRequestMethod("GET");
        conn.setRequestProperty("Accept", "application/json");
        conn.setRequestProperty("Authorization", "Basic "+authStrEnc);
        
        BufferedReader brf = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        
        JSONParser json=new JSONParser();
        jsonObject=(JSONObject)json.parse(brf);
        
        
        int cp;
        while ((cp = brf.read()) != -1) {
          sb.append((char) cp);
        }
    }
    catch(IOException e)
    {
        System.out.println("Something went wrong while reading/writing in stream!!");
    }
    catch (ParseException e) {
        System.out.println("Parse error");
    }
    
    //For purpose of simplicity we have fetched one of the fields from JSON response
    return (String)jsonObject.get("firstName");
    
}

}