在网上找到一篇GAE上建JSON WEB服务的文章
Json REST Java Service for Google App Engine Example
1. Download Eclipse and the Google Plugin for Eclipse ( I use Eclipse IDE for Java EE Developers Helios 3.6)
http://code.google.com/eclipse/docs/download.html
2. Down Restlet (I use 2.0.5 stable zip file)
http://www.restlet.org/downloads/stable
3. Create a Web Application Project
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Like this. |
4. Copy these files to /war/WEB-INF/lib
org.json.jar (in D:\DevTools\restlet-gae-2.0.5\lib\org.json_2.0)
org.restlet.ext.json.jar (in D:\DevTools\restlet-gae-2.0.5\lib)
org.restlet.ext.servlet.jar (in D:\DevTools\restlet-gae-2.0.5\lib)
org.restlet.jar (in D:\DevTools\restlet-gae-2.0.5\lib)
Look like this,
5. Add JARS… to Libaries
Like this,
6. Change MyFirstRestServerServlet.java
package com.example.myfirstrestserver;
import org.restlet.Application;
import org.restlet.Restlet;
import org.restlet.routing.Router;
public class MyFirstRestServerServlet extends Application{
/**
* Creates a root Restlet that will receive all incoming calls.
*/
@Override
public synchronized Restlet createRoot() {
// Create a router Restlet that routes each call to a new Resource
Router router = new Router(getContext());
router.attachDefault(TestJsonResource.class);
return router;
}
}
Like this,
7. Make a new java class called TestJsonResource,
package com.example.myfirstrestserver;
import java.io.IOException;
import org.json.JSONException;
import org.json.JSONObject;
import org.restlet.ext.json.JsonRepresentation;
import org.restlet.resource.Get;
import org.restlet.resource.ServerResource;
public class TestJsonResource extends ServerResource {
@Get("json")
public String handleGet() {
try {
JSONObject json = new JSONObject();
json.put("name", "value");
JsonRepresentation jsonRep = new JsonRepresentation(json);
return jsonRep.getText();
} catch (JSONException e) {
e.printStackTrace();
} catch (IOException e)
{
e.printStackTrace();
}
return null;
}
}
Like this,
8. Change web.xml file,
xml version="1.0" encoding="utf-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
<context-param>
<param-name>org.restlet.applicationparam-name>
<param-value>com.example.myfirstrestserver.MyFirstRestServerServletparam-value>
context-param>
<servlet>
<servlet-name>MyFirstRestServerservlet-name>
<servlet-class>org.restlet.ext.servlet.ServerServletservlet-class>
servlet>
<servlet-mapping>
<servlet-name>MyFirstRestServerservlet-name>
<url-pattern>/*url-pattern>
servlet-mapping>
<welcome-file-list>
<welcome-file>index.htmlwelcome-file>
welcome-file-list>
web-app>
9. Run.