How to Learn HttpClient GET and POST requests in Java

How to Learn HttpClient GET and POST requests in Java
Author: fengxueting Source: http://www.cnblogs.com/fengxueting-px/

Java-based HttpClient GET and POST requests

1. Preface
2. GET request
3. POST request

 

I. Preface

This blog POST records HttpClient's GET and POST requests.

This article is based on the following:

Http://huangqiqing123.iteye.com/blog/2054436 (addHeader and setHeader of HttpClient)
Http://zywang.iteye.com/blog/916834 (use Apache HttpClient to access JSP to send GET and POST requests)
Http://www.linuxidc.com/Linux/2012-02/55502p3.htm (use of HttpClient 4.0)

 

2. GET request

An example of a GET request is as follows:

    //httpClient    HttpClient httpClient = new DefaultHttpClient();    // get method    HttpGet httpGet = new HttpGet("https://api.microsofthealth.net/v1/me/Summaries/Daily");        // set header    String Au="Bearer "+access_token;    httpGet.setHeader("Authorization",Au);        //response    HttpResponse response = null;      try{        response = httpClient.execute(httpGet);    }catch (Exception e) {}     //get response into String    String temp="";    try{        HttpEntity entity = response.getEntity();        temp=EntityUtils.toString(entity,"UTF-8");    }catch (Exception e) {}         return temp;

 

Iii. POST requests:

An example of a GET request is as follows:

    //httpClient    HttpClient httpClient = new DefaultHttpClient();    // get method    HttpPost httpPost = new HttpPost("https://login.live.com/oauth20_token.srf");          // set header    httpPost.setHeader("Content-Type","application/x-www-form-urlencoded");     //set params    List<NameValuePair> params = new ArrayList<NameValuePair>();    params.add(new BasicNameValuePair("client_id",client_id));    params.add(new BasicNameValuePair("redirect_uri",redirect_uri));    params.add(new BasicNameValuePair("client_secret",client_secret));    params.add(new BasicNameValuePair("code",code));    params.add(new BasicNameValuePair("grant_type","authorization_code"));    try{        httpPost.setEntity(new UrlEncodedFormEntity(params));    }catch (Exception e) {}     //response    HttpResponse response = null;      try{        response = httpClient.execute(httpPost);    }catch (Exception e) {}        //get response into String    String temp="";    try{        HttpEntity entity = response.getEntity();        temp=EntityUtils.toString(entity,"UTF-8");    }catch (Exception e) {}        return temp;