容易的httpClient访问

简单的httpClient访问

1、下载 httpcomponents-client-4.1.1
2、在eclipse中导入htttpClient的jar???

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首先模拟http请求头： HttpGet httpost = new HttpGet("http://www.baidu.com");        //确定模拟浏览器的类型        httpost.addHeader("User-Agent","Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2.18) Gecko/20110614 Firefox/3.6.18");       //请求格式        httpost.addHeader("Accept","text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8") ;      //请求刷新的地址        httpost.addHeader("Referer",  "http://www.baidu.com/");     //请求的语种        httpost.addHeader("Accept-Language", "zh-cn");    //字符集信息        httpost.addHeader("Accept-Charset", "GB2312,utf-8;q=0.7,*;q=0.7");   //请求的主机        httpost.addHeader("Host", "www.baidu.com");   //连接信息        httpost.addHeader("Connection", "keep-alive");添加请求参数：            List <namevaluepair> nvps = new ArrayList <namevaluepair>();            nvps.add(new BasicNameValuePair("username", "caisijia"));            nvps.add(new BasicNameValuePair("password", "12qwaszx"));            nvps.add(new BasicNameValuePair("getrand", "av1.v"));           //接受请求参数            httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));               发送请求 获取响应头    //建立http客户端  HttpClient httpclient = new DefaultHttpClient();        HttpResponse response=null;try {                       //执行并且获取 响应头response = httpclient.execute(httpget);Header[] hs = response.getAllHeaders();for(Header h:hs) {System.out.println(h.getName()+"   "+h.getValue());}} catch (Exception e) {//发送请求时 错误e.printStackTrace();}        //获取响应内容        HttpEntity ent = response.getEntity();        InputStream instream=null;        BufferedReader reader = null;        try {        if (ent != null) {        instream = ent.getContent();            reader = new BufferedReader(                        new InputStreamReader(instream));                StringBuilder sb  =new StringBuilder();        String line;        while ((line = reader.readLine()) != null) {        sb.append(line);        }        System.out.println(sb.toString());        }         } catch (Exception ex) {         if(httpget.isAborted())            httpget.abort();         } finally {            try {            if(reader!=null)            reader.close();            if(instream!=null)            instream.close();            }catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}    }            httpclient.getConnectionManager().shutdown();

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