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Step 1: create a Java project as shown below.  In the Build Path, add Selenium and JUnit libraries; download apache jar file from the link "org.jbundle.util.osgi.wrapped.org.apache.http.client-4.1.2.jar" and add the file as External JARS. 

Step 2: write the code in WeatherApiTest.java class. 

package com.seleniummaster.apitest;

import java.io.IOException;
import java.util.concurrent.TimeUnit;
import junit.framework.Assert;
import org.apache.http.client.ClientProtocolException;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;

@SuppressWarnings("deprecation")
public class WeatherApiTest {
	private WebDriver driver;
	private String baseUrl;
	@Before
	public void setUp() throws Exception {
		  driver = new FirefoxDriver();
		    baseUrl = "http://openweathermap.org/current";
		    driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
		  }
	

	@After
	public void tearDown() throws Exception {
		 driver.close();
		 driver.quit();
	}

	@Test
	public void test() throws ClientProtocolException, IOException {
		driver.get(baseUrl);
		driver.navigate().to("http://api.openweathermap.org/data/2.5/weather?q=London");	
	 WebElement webElement=driver.findElement(By.tagName("pre"));
	 WeatherApiResponse weatherApiResponse=new WeatherApiResponse();
	 String ExpectedString=weatherApiResponse.GetResponse();
	 Assert.assertTrue(webElement.getText().equals(ExpectedString));
	}

}

Step 3: write the code in the WeatherApiResponse.java class

package com.seleniummaster.apitest;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

public class WeatherApiResponse {
	
	private final String USER_AGENT="Mozilla/5.0";
	public String GetResponse() throws ClientProtocolException, IOException
	{
		StringBuffer result=new StringBuffer();
		HttpClient client=new DefaultHttpClient();
		String url="http://api.openweathermap.org/data/2.5/weather?q=London";
		HttpGet request=new HttpGet(url);
		request.addHeader("User-Agent",USER_AGENT);
		HttpResponse response=client.execute(request);
		int responseCode=response.getStatusLine().getStatusCode();
		System.out.println("Response Code: " + responseCode);
		try{
		if(responseCode==200)
			
		{
			System.out.println("Get Response is Successfull");
			BufferedReader reader=new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
			String line="";
			while((line=reader.readLine())!=null)
			{
				result.append(line);
				System.out.println(result.toString());
			}
		}
		return result.toString();
		
	}
		catch(Exception ex)
	{
		result.append("Get Response Failed");
		return result.toString();
	}

}
}

Step 4: run the file WeatherApiTest.java as JUnit Test. The test passed. Below is the console output

Response Code: 200
Get Response is Successfull
{"coord":{"lon":-0.13,"lat":51.51},"sys":{"type":1,"id":5093,"message":0.0202,"country":"GB","sunrise":1411451341,"sunset":1411494984},"weather":[{"id":721,"main":"Haze","description":"haze","icon":"50n"}],"base":"cmc stations","main":{"temp":282.35,"pressure":1024,"humidity":87,"temp_min":280.93,"temp_max":284.15},"wind":{"speed":1.33,"deg":208.502},"clouds":{"all":8},"dt":1411431497,"id":2643743,"name":"London","cod":200}

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原文：https://www.cnblogs.com/zgq123456/p/11499121.html