使用httpClient进行接口测试

概述

现今很多Web应用开发都是分前后台的,后台开发提供接口调用返回Json对象,前台使用JS框架去加载后台返回的Json.本文以实例简述如何通过HttpClient测试这样的后台接口

 

处理Json对象的基本API

JSON包中最常用的两个类就是JSONObject和JSONArray,具体可以参考JSON for java入门总结

如下是自己模仿的简单例子:

package com.james.json;

import org.json.JSONArray;
import org.json.JSONObject;

public class JsonTest {

	public static void main(String[] args) {
		
		// Test JSONObject.
		JSONObject jsonobj = new JSONObject("{'name':'jingshou','age':30}");  
        String name = jsonobj.getString("name");  
        int age = jsonobj.getInt("age");
        System.out.println(jsonobj.toString());
        System.out.println(name+":"+age); 
        System.out.println("**********");
        
        // Test JSONArray.
        JSONArray jsonarray = new JSONArray("[{'name':'jingshou','age':30},{'name':'xiaohong','age':29}]");  
        for(int i=0;i<jsonarray.length();i++){
        	JSONObject jo = jsonarray.getJSONObject(i);
        	System.out.println(jo);
            String name1 = jo.getString("name");
            int age1 = jo.getInt("age");
            System.out.println("name1= "+name1);
            System.out.println("age1= "+age1);
        }
	}
	

}

 运行结果如下:

{"age":30,"name":"jingshou"}
jingshou:30
**********
{"age":30,"name":"jingshou"}
name1= jingshou
age1= 30
{"age":29,"name":"xiaohong"}
name1= xiaohong
age1= 29

 从以上例子我们看到的基本事实是:

• 可以通过字符串直接构造一个JSONObject
• JSONObject里的key在显式传入的时候是用单引号包裹起来的,但是打印出来的时候依然是我们期望的双引号

使用httpclient处理API返回

如下例子演示如何使用httpClient获取API返回的JSON字符串以及处理:

package com.james.json;

import java.io.IOException;

import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONObject;


public class SimpleServiceTest {

	public static void main(String[] args) throws ClientProtocolException, IOException {
		CloseableHttpClient httpclient = HttpClients.createDefault();
		HttpPost httppost = new HttpPost("http://jingshou.com/admin/searchUser.action?search_loginid=jingshou");
		CloseableHttpResponse response = httpclient.execute(httppost);
		try {
			HttpEntity myEntity = response.getEntity();
			System.out.println(myEntity.getContentType());
			System.out.println(myEntity.getContentLength());
			
			String resString = EntityUtils.toString(myEntity);
            // 使用返回的字符串直接构造一个JSONObject		
			JSONObject jsonobj = new JSONObject(resString);
			System.out.println(jsonobj.toString());
			// 获取返回对象中"resultSize的值"
			int resutltSize = jsonobj.getInt("resultSize");
			System.out.println("Search Results Size is: "+ resutltSize); 
			// 获取"clients"的值,它是一个JSONArray
			JSONArray jsonarray = jsonobj.getJSONArray("clients");
			System.out.println(jsonarray.toString());
			
	        
		} finally {
		    response.close();
		}
		
		
	}

}

运行结果如下:

Content-Type: text/plain; charset=UTF-8
-1
{"resultSize":1,"clients":[{"expirationDate":0,"reqStatus":0,"mostRecentActivity":1388376890000,"clientName":"Jingshou Li","company":"Pending","internal":true,"clientId":"jingshou","salesNames":"","disabled":false}]}
Search Results Size is: 1
[{"expirationDate":0,"reqStatus":0,"mostRecentActivity":1388376890000,"clientName":"Jingshou Li","company":"Pending","internal":true,"clientId":"jingshou","salesNames":"","disabled":false}]

 小结:

• 通过API返回的JSON字符串直接构造JSON对象
• 如果要读取JSONObject内部数据,需要事先知道对象的结构,所以以上处理方法不具有通用性,只能处理特定的返回

补充学习:

• http://cgs1999.iteye.com/blog/1608003
• http://cgs1999.iteye.com/blog/1609756

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