How to integrate Google APIs with Google's application system (3) -- call the restful service of Google discovery API

Hello everyone , I meet you again , I'm the king of the whole stack , I wish every programmer can learn more languages .

Said so much , Then first of all, agree with me with Google Discovery RESTful Service as an example , Show you how to use the most common Java Code calls Google Discovery RESTful service .

introduction ：

stay “ How to use Google APIs and Google Application system integration (2)” Of , I listed the current Google APIs All supported Google APIs. In fact, I call this table with code Google Discovery RESTFul The service is self generated . The detailed steps and codes are as follows ：

(1) Visit Google Discovery RESTFul Service for ：https://www.proxy.ustclug.org/discovery/v1/apis To be able to obtain RESTFul The result returned by the service ： By visiting JSONtoStringConverter–>readJSONSAsString()

package com.henry.json.gson.googlediscovery;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

public class JSONtoStringConverter {
   private String url_path="https://www.proxy.ustclug.org/discovery/v1/apis";
	public String readJSONSAsString(){
		InputStream in=this.getJSONSchemaInputStream();
		return readJSONSAsString(in);
	}
	private InputStream getJSONSchemaInputStream() {
		InputStream ipStream = null;
		if (url_path == null) {
			throw new IllegalArgumentException("The URL Path can't be empty!!!");
		}
		try {
			URL url = new URL(url_path);
			HttpURLConnection httpConnection = (HttpURLConnection) url
					.openConnection();
			httpConnection.setRequestMethod("GET");
			httpConnection.setReadTimeout(30000);
			httpConnection.setDoInput(true);
			ipStream = httpConnection.getInputStream();
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return ipStream;
	}
	private String readJSONSAsString(InputStream in){
		String jsonString="";
		ByteArrayOutputStream baosArrayOutputStream=new ByteArrayOutputStream();
		byte[] bytes=new byte[1024];
		int len=0;
		try {
			while((len=in.read(bytes))!=-1){
				baosArrayOutputStream.write(bytes, 0, len);
			}
			jsonString=new String(baosArrayOutputStream.toByteArray(),"utf-8");
		} catch (IOException e) {
			e.printStackTrace();
		}
		System.out.println(jsonString);
		return jsonString;
	}
	public static void main(String[] args) {
		JSONtoStringConverter jSONtoStringConverter=new JSONtoStringConverter();
		jSONtoStringConverter.readJSONSAsString();

	}

}

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（2） Parse the returned JSON data , But analysis once , We need to establish corresponding JavaBean, So we can take JSON The object and Java Object mapping .

2.1 GoogleDiscoveryBean

package com.henry.json.gson.googlediscovery;

import java.util.List;

public class GoogleDiscoveryBean {
	private String kind;
	private String discoveryVersion;
	private List<Items> items;

	public String getKind() {
		return kind;
	}

	public void setKind(String kind) {
		this.kind = kind;
	}

	public String getDiscoveryVersion() {
		return discoveryVersion;
	}

	public void setDiscoveryVersion(String discoveryVersion) {
		this.discoveryVersion = discoveryVersion;
	}

	public List<Items> getItems() {
		return items;
	}

	public void setItems(List<Items> items) {
		this.items = items;
	}
	@Override
	public String toString(){
		return kind+"--"+discoveryVersion+"--size:"+items.size();
	}
}

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2.2 Items

package com.henry.json.gson.googlediscovery;
/*
"kind": "discovery#directoryItem",
"id": "adexchangebuyer:v1",
"name": "adexchangebuyer",
"version": "v1",
"title": "Ad Exchange Buyer API",
"description": "Lets you manage your Ad Exchange Buyer account.",
"discoveryRestUrl": "https://www.proxy.ustclug.org/discovery/v1/apis/adexchangebuyer/v1/rest",
"discoveryLink": "./apis/adexchangebuyer/v1/rest",
"icons": {
 "x16": "http://www.google.com/images/icons/product/doubleclick-16.gif",
 "x32": "http://www.google.com/images/icons/product/doubleclick-32.gif"
},
"documentationLink": "https://developers.google.com/ad-exchange/buyer-rest",
"preferred": false
*/
public class Items {
 private String kind;
 private String id;
 private String name;
 private String version;
 private String title;
 private String description;
 private String discoveryRestUrl;
 private String discoveryLink;
 private String documentationLink;
 private String preferred;
public String getKind() {
	return kind;
}
public void setKind(String kind) {
	this.kind = kind;
}
public String getId() {
	return id;
}
public void setId(String id) {
	this.id = id;
}
public String getName() {
	return name;
}
public void setName(String name) {
	this.name = name;
}
public String getVersion() {
	return version;
}
public void setVersion(String version) {
	this.version = version;
}
public String getTitle() {
	return title;
}
public void setTitle(String title) {
	this.title = title;
}
public String getDescription() {
	return description;
}
public void setDescription(String description) {
	this.description = description;
}
public String getDiscoveryRestUrl() {
	return discoveryRestUrl;
}
public void setDiscoveryRestUrl(String discoveryRestUrl) {
	this.discoveryRestUrl = discoveryRestUrl;
}
public String getDiscoveryLink() {
	return discoveryLink;
}
public void setDiscoveryLink(String discoveryLink) {
	this.discoveryLink = discoveryLink;
}
public String getDocumentationLink() {
	return documentationLink;
}
public void setDocumentationLink(String documentationLink) {
	this.documentationLink = documentationLink;
}
public String getPreferred() {
	return preferred;
}
public void setPreferred(String preferred) {
	this.preferred = preferred;
}

}

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(3) download JSON java The library of ： http://code.google.com/p/google-gson/ GSon It's an analysis provided by Google JSON data : 1. Google GSON This Java The class library can Java Object conversion to JSON, Can also put JSON The string is converted to an equal Java object . 2.Gson Support random and complex Java Objects contain objects without source code .

(4) Create a GoogleGSonTools： This class will Google Discovery RESTful Service returned JSON String , Take the initiative to transform into GoogleDiscoveryBean object , This method cannot 10 That's ok , It's that simple .

package com.henry.json.gson.googlediscovery;

import com.google.gson.Gson;

public class GoogleGSonTools {
	public static <T> T getGoogleDiscoveryBean(String josnString, Class<T> clazz) {
		T t = null;
		try {
			Gson gson = new Gson();
			t = gson.fromJson(josnString, clazz);
		} catch (Exception e) {
		}
		return t;
	}
}

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（5） Combine the above （1）~（4）, We return the value , Format into a HTML Table for .

package com.henry.json.gson.googlediscovery;

import java.util.List;

public class GoogleAPIsListViewService {
  
	public String listAllGoogleAPIs(){
	    StringBuilder sbBuilder=new StringBuilder("<table border=\"1\" style=\"word-break:break-all; word-wrap:break-word;\"> <tr><td> Serial number </td><td>API  title </td><td> name </td><td> Version number </td><td>RestFul Requested URL</td><td>RestFul Requested URL</td></tr>");
		JSONtoStringConverter jSONtoStringConverter=new JSONtoStringConverter();
		String json=jSONtoStringConverter.readJSONSAsString();
		GoogleDiscoveryBean googleDiscoveryBean=GoogleGSonTools.getGoogleDiscoveryBean(json, GoogleDiscoveryBean.class);
		List<Items> listItems=googleDiscoveryBean.getItems();
		if(listItems!=null&&listItems.size()>0){
			for(int i=0;i<listItems.size();i++){
			  Items items=listItems.get(i);
			  sbBuilder.append("<tr>");
			  sbBuilder.append("<td>").append(" "+(i+1)+" ").append("</td>");
			  sbBuilder.append("<td>").append(items.getTitle()).append("</td>");
			  sbBuilder.append("<td>").append(items.getName()).append("</td>");
			  sbBuilder.append("<td>").append(items.getVersion()).append("</td>");
			  sbBuilder.append("<td>").append(items.getDiscoveryRestUrl()).append("</td>");
			  sbBuilder.append("<td>").append(items.getDocumentationLink()).append("</td>");
			  sbBuilder.append("</tr>");
			}
		}
		sbBuilder.append("</table>");
		System.out.println(sbBuilder.toString());		
		return sbBuilder.toString();
	}
	public static void main(String[] args) {
		GoogleAPIsListViewService gavs=new GoogleAPIsListViewService();
		gavs.listAllGoogleAPIs();
	}

}

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The output is zero ： “ How to use Google APIs and Google Application system integration (2)” Of the table seen in the article html Source code .

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