ADF_230：ADF Mobile 11.1.2.4 Samples 介绍（16）：RESTDemo

开发运行环境：JDeveloper 11.1.2.4 + Android SDK r21.1

RESTDemo演示了如何使用REST风格的Web Service。

这里展示了两种使用方法：REST-XML和REST-JSON，去调用一个公共的Web Service：http://freegeoip.net/，获取当前机器的地理位置。

REST-XML使用了一个XSD，并创建了一个URL Service Data Control去访问结构化的数据，UI层直接绑定到这个DC上。

REST-JSON使用了一个帮助类：RESTServiceAdapter去获取Web Service的URL connection，然后使用帮助类：JSONSerializationHelper解析返回结果（非结构化的数据）。UI层是间接绑定到一个Managed Bean生成的DC。

1. RESTJSONBean.java 代码

package mobile;

import oracle.adfmf.dc.ws.rest.RestServiceAdapter;

import oracle.adfmf.framework.api.JSONBeanSerializationHelper;

import oracle.adfmf.framework.api.Model;

import oracle.adfmf.java.beans.PropertyChangeListener;

import oracle.adfmf.java.beans.PropertyChangeSupport;

public class RESTJSONBean {

    private transient PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(this);

    public RESTJSONBean() {

    }

    private String searchIp = "oracle.com";

    private String jsonResponse = "";

    private RESTJSONResponse response = null;

    public void setSearchIp(String searchIp) {

        String oldSearchIp = this.searchIp;

        this.searchIp = searchIp;

        propertyChangeSupport.firePropertyChange("searchIp", oldSearchIp, searchIp);

    }

    public void addPropertyChangeListener(PropertyChangeListener l) {

        propertyChangeSupport.addPropertyChangeListener(l);

    }

    public void removePropertyChangeListener(PropertyChangeListener l) {

        propertyChangeSupport.removePropertyChangeListener(l);

    }

    public String getSearchIp() {

        return searchIp;

    }

    public void setJsonResponse(String response) {

        String oldResponse = this.jsonResponse;

        this.jsonResponse = response;

        propertyChangeSupport.firePropertyChange("jsonResponse", oldResponse, response);

    }

    public String getJsonResponse() {

        return jsonResponse;

    }

    public void setResponse(RESTJSONResponse response) {

        RESTJSONResponse oldResponse = this.response;

        this.response = response;

        propertyChangeSupport.firePropertyChange("response", oldResponse, response);

    }

    public RESTJSONResponse getResponse() {

        return response;

    }

    public void loadData() {

        RestServiceAdapter restServiceAdapter = Model.createRestServiceAdapter();

        // Clear any previously set request properties, if any

        restServiceAdapter.clearRequestProperties();

        // Set the connection name

        restServiceAdapter.setConnectionName("GeoIP");

        // Specify the type of request

        restServiceAdapter.setRequestType(RestServiceAdapter.REQUEST_TYPE_GET);

        // Specify the number of retries

        restServiceAdapter.setRetryLimit(0);

        // Set the URI which is defined after the endpoint in the connections.xml.

        // The request is the endpoint + the URI being set

        restServiceAdapter.setRequestURI("/json/" + getSearchIp());

        setJsonResponse("");

        // Execute SEND and RECEIVE operation

        try {

            // For GET request, there is no payload

            setJsonResponse(restServiceAdapter.send(""));

            

            // Now create a new RESTJSONResponse object and parse the JSON string returned into this class

            RESTJSONResponse res = new RESTJSONResponse();

            res = (RESTJSONResponse)JSONBeanSerializationHelper.fromJSON(RESTJSONResponse.class, getJsonResponse());

            setResponse(res);

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}

代码中的连接"GeoIP" 定义来自于URL Connection：

参考文献：
1. https://blogs.oracle.com/mobile/entry/adf_mobile_rest_json_xml
2. http://www.youtube.com/watch?v=HOesFpjBz2M
3. http://biemond.blogspot.com/2012/10/using-json-rest-in-adf-mobile.html