HttpClient—Apache的HTTP 协议工具包

最新推荐文章于 2021-01-15 19:28:34 发布

原创最新推荐文章于 2021-01-15 19:28:34 发布 · 866 阅读

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文章标签：

#HttpClient #apache #get请求 #post请求

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本文对比了Apache HttpClient与Java标准类HttpURLConnection的区别，详细介绍了两者在实现HTTP请求时的不同之处，包括请求头、参数、内容体及响应等方面的封装差异。

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介绍

androidSDK中集成了Apache的HttpClient模块，用来提供高效的、最新的、功能丰富的支持 HTTP 协议工具包，并且它支持 HTTP 协议最新的版本和建议。使用HttpClient可以快速开发出功能强大的Http程序。

区别

HttpClient是个很不错的开源框架，封装了访问http的请求头，参数，内容体，响应等等，

HttpURLConnection是java的标准类，什么都没封装，用起来太原始，不方便，比如重访问的自定义，以及一些高级功能等。

使用方法：

Get请求方式

String urlAddress = "http://192.168.1.102:8080/qualityserver/login.do";  
public HttpClientServer(){  

 }     
public String doGet(String username,String password){  
    String url= urlAddress + "?username="+username+"&password="+password;  
     // 使用get方法连接服务器 
    HttpGet httpGet = new HttpGet(url)..getParams().getParameter("true");  

    HttpClient hc = new DefaultHttpClient();  //创建HttpClient的对象
    try {  
     // 客户端开始向指定的网址发送请求  
        HttpResponse ht = hc.execute(httpGet);  //获得HttpResponse

        if(ht.getStatusLine().getStatusCode() == HttpStatus.SC_OK){  
            HttpEntity he = ht.getEntity();    //获取实体
            InputStream is = he.getContent();  //获取一个输入流
            BufferedReader br = new BufferedReader(new InputStreamReader(is));  
            String response = "";  
            String readLine = null;  
            while((readLine =br.readLine()) != null){  
                response = response + readLine;  
            }  
            is.close();  
            br.close();  
            return response;  
        }else{  
            return "error";  
        }  
    } catch (ClientProtocolException e) {  
        // TODO Auto-generated catch block  
        e.printStackTrace();  
        return "exception";  
    } catch (IOException e) {  
        // TODO Auto-generated catch block  
        e.printStackTrace();  
        return "exception";  
    }      
}

Post的请求方式

public String doPost(String username,String password){  
    HttpPost httpPost = new HttpPost(urlAddress);  
    List params = new ArrayList();  //创建集合，放入数据
    NameValuePair pair1 = new BasicNameValuePair("username", username);  
    NameValuePair pair2 = new BasicNameValuePair("password", password);  
    params.add(pair1);  
    params.add(pair2);  

    HttpEntity he;  
    try {  
        he = new UrlEncodedFormEntity(params, "gbk");  
        httpPost.setEntity(he);  

    } catch (UnsupportedEncodingException e1) {  
        // TODO Auto-generated catch block  
        e1.printStackTrace();  
    }   

    HttpClient hc = new DefaultHttpClient();  
    try {  
        HttpResponse ht = hc.execute(httpPost);  
        //连接成功  
        if(ht.getStatusLine().getStatusCode() == HttpStatus.SC_OK){  
            HttpEntity het = ht.getEntity();  
            InputStream is = het.getContent();  
            BufferedReader br = new BufferedReader(new InputStreamReader(is));  
            String response = "";  
            String readLine = null;  
            while((readLine =br.readLine()) != null){  
                response = response + readLine;  
            }  
            is.close();  
            br.close();  
            return response;  
        }else{  
            return "error";  
        }  
    } catch (ClientProtocolException e) {  
        // TODO Auto-generated catch block  
        e.printStackTrace();  
        return "exception";  
    } catch (IOException e) {  
        // TODO Auto-generated catch block  
        e.printStackTrace();  
        return "exception";  
    }     
}