"HttpClient4.5 training" one. Get request access to Sina (non-original tutorial)

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problem: Analog browser access to Sina network http://www.sina.com.cn/ and parse the return result

First, analysis

After the previous study, you have mastered the GET request and resolved the return result, such as:

A typical get access procedure that uses HttpClient4.5 is:

1. Build HttpClient--------------> First you have to have a browser

2. Build request (start line, header)

3. Executing requests using httpclient

4. Parse accordingly (starting line, header, entity)

It also includes releasing resources HttpClient, entities, response

Second, build

Follow the steps above to construct the

Import the HttpClient4.5 library (this article uses Eclipse4.4)

1. Build HttpClient

Closeablehttpclient Client=httpclients.createdefault ();

Program end needs to be closed

Client.close ();

2. Build the request

Request start line--httpclient will automatically build HttpGet get=new httpget ("http://www.sina.com.cn/") based on the information;//request Header-optional, user-agent for some servers required, It is not possible to return the correct result Get.setheader ("User-agent", "mozilla/5.0" (Windows NT 6.1; WOW64; rv:39.0) gecko/20100101 firefox/39.0 ");//Execute Request Closeablehttpresponse Response=client.execute (GET);

3. Execution of requests

Closeablehttpresponse Response=client.execute (GET);

Get the start line System.out.println (Response.getstatusline (). toString () + "\ n");//Get the first---of course you can use other methods to get header[] hs= Response.getallheaders (); for (Header h:hs) {System.out.println (H.getname () + ": \ T" +h.getvalue () + "\ n");} Get entity httpentity ety=response.getentity (); System.out.println (entityutils.tostring (ety, "GBK"));//The encoding format of the Sina Network Gbkentityutils.consume (ety);// Release entity Response.close ();//Close response

Iii. Complete Procedures

For the convenience of viewing, I throw an exception directly on the main function, and I need try-catch-finally when I write it.

return Result:

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"HttpClient4.5 training" one. Get request access to Sina (non-original tutorial)