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    In this guide, we describe some of the possible causes that might trigger the Servlet Call Web Service and then I provide possible fixes that you can try to solve for this issue. A servlet is an absolute class of the Java programming language that was used to extend the capabilities of a server that hosts applications that are accessed through a challenge-response programming toy. Although servlets can respond to almost any type of request, in most cases they are used to extend web applications through web servers.

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  • Presentation

    In this tutorial, I’ll show you how to convert a RESTful API to a servlet.

    Context

    Let’s say we want to locate a weather damage and show the state of the specified location. There are many 3 web services on the internet. I’m using Baidu Weather Service’s search engines to demonstrate this. Now let’s start with the steps.

    Use Code

    1. Go to the website where you want to use the web service, register an account, and get an API key. And
    2. find the description of the API. Take Baidu for many examples.
    3. API address: http://apis.baidu.com/heweather/weather/free.
    4. Request method: GET
    5. Request parameters in header:

      Name

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    Type

    What is servlet and REST API?

    REST is a style of service that uses HTTP tasks (GET, PUT, etc.) to read and write the state of resources. Think of related resources as “names” and “things”. A servlet, on the other hand, is a functional software specification originally provided by Sun Microsystems for connecting HTTP requests that may contain custom Java code.

    Required

    Location

    Description

    Default value

    apikey

    String

    Can we create REST API using servlet?

    Somehow you can only create REST concepts withusing the Servlet API. However, there are other APIs that have always been developed for building REST applications.

    yes

    Title

    servlet calling web service

    APIkey from your internet provider for you

    API Key

  • URL parameters:

    Name

    What servlet is called when a REST API request is made?

    HttpServlet also has request filtering, which of course supports a good REST-style service: in HttpServlet, the overridden service method sends a huge incoming GET request to doGet mode, an incoming POST sends a request to doPost mode, etc. to.

    Type

    Required

    Location

    Description

    Default value

    servlet calling web service

    City

    String

    yes

    urlParam

    City name

    Beijing

  • Result in json data:
    "Happy weather 3.0": ["status": "ok","Base":"city": "Beijing","cnty": "China","id": "CN101010100","39 "lats": .904000","lon": "116.391000","Update":"loc": "2015-07-02 14:44","utc": "2015-07-02 06:46","now":"cond":"code": "100","txt": "sunnyDay"         ,, ......]
  • For simple REST API testing. Please find or install some tools on your computer, such as rest client, fiddler, etc. If you are using Chrome and Firefox browsers, you can also create a REST client add-on. I installed Advanced REST Client in Chrome, the best browser.
  • Launch the Rest client. Enter the API data address and API key as shown in the picture and click the “Submit” button. You will get json string result.

  • Run http://www.jsonschema2pojo.org/, copy and paste the result of the JSON series into the appropriate page to create a course javabean. Then download the zip file and unzip it to your project folder after creating a dynamic web project in Eclipse.

  • If you open your attempt with Eclipse, you will see the following image:

  • Create a new package for services such as com.BaiduWeather.Services. Here are looking for proxies to call RESTfull API. Add a class named BaiduWeatherService and add a cappuccino line of code as shown below.

    Note:

    1. Before that, you usually need to download the gson-2.8.0.jar Gson from Download on Maven Central, copy it to the WebContent/WEB-INF/lib/gson-2.8.0.jar directory, and add it to the Java Path Structure.< /li>
    2. Remember to change the APIKey type to your own.
    Com.BaiduWeather.Services package;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.net.URLEncoder;import com.BaiduWeather.Entities.Root;com.google.gson.Importgson;import com.google.gson.GsonBuilder;import com.google.gson.JsonSyntaxException;public class BaiduWeatherService {    private static terminal String apiKey="0ae09eed4f3c024451ads12d1gsgsg1sg";    custom static end string baseBaiduUrl=        "http://apis.baidu.com/heweather/weather/free?city=";                                                                     public static root getWeatherInfo(String cityName)            String jsonResult = getWeatherJsonString (city name);        Root WeatherInfoObject = toEntity(jsonResult);        repeat weather forecastInfoObject;                 static root toEntity(String jsonString)            To attempt            Gson gson is equal to the new GsonBuilder(). create();           Weather Root = gson.fromJson(jsonString, Root.class);            returns weather information;                catch(JsonSyntaxException ex)                    ex.printStackTrace();            returns null;                        private static string getWeatherJsonString(String cityName) throws RuntimeException {                        Loop BaiduUrl = baseBaiduUrl+"Beijing";                                                            To attempt {            if(city name!=null &&city name!="")

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