02_Httpclient

/**
 * Http GET请求百度，但是返回乱码
 */
public static void main(String[] args) throws Exception {
    //创建一个默认的HttpClient类
    CloseableHttpClient  httpclient=HttpClients.createDefault();
    //设置Http连接方式为get，访问的URL为"http://www.baidu.com"
    HttpGet httpGet=new HttpGet("http://www.baidu.com");
    //得到返回的response对象
    HttpResponse response=httpclient.execute(httpGet);
    //得到response里面的实体信息
    HttpEntity entity=response.getEntity();
    //利用EntityUtils工具类将实体信息转换为字符串
    String html=EntityUtils.toString(entity);
    //打印
    System.out.println(html);
    //关闭链接
    httpclient.close();
}

public static void main(String[] args) throws Exception {
    //创建一个默认的HttpClient类
    CloseableHttpClient  httpclient=HttpClients.createDefault();
    //设置Http连接方式为get，访问的URL为"http://www.baidu.com"
    HttpGet httpGet=new HttpGet("http://www.baidu.com");
    //得到返回的response对象
    HttpResponse response=httpclient.execute(httpGet);
    //得到response里面的实体信息
    HttpEntity entity=response.getEntity();
    //利用EntityUtils工具类将实体信息转换为字符串
    String html=EntityUtils.toString(entity,"UTF-8");   
    //打印
    System.out.println(html);
    //关闭链接
    httpclient.close();
}

@Test
public void testRequestHeader() throws ClientProtocolException, IOException{
    CloseableHttpClient  httpclient=HttpClients.createDefault();
    HttpGet httpGet=new HttpGet("http://download.csdn.net/my/uploads");  //访问CSDN的"下载资源"页面
    //带上cookie请求消息头
    httpGet.setHeader("cookie", "uuid_tt_dd=439312343077018427_20160728; bdshare_firstime=2345017309443; _JQCMT_ifcookie=1; ********************");  //登录之后用浏览器获取对应给的Cookie
    httpGet.setHeader("Host","download.csdn.net");
    httpGet.setHeader("Referer","http://download.csdn.net/my/uploads");
    HttpResponse response=httpclient.execute(httpGet);
    HttpEntity entity=response.getEntity();
    String html=EntityUtils.toString(entity,"UTF-8");
    System.out.println(html);
    httpclient.close();
}

@Test
public void test01() throws Exception{
    CloseableHttpClient  httpclient=HttpClients.createDefault();
    HttpGet httpGet=new HttpGet("http://www.baidu.com");
    HttpResponse response=httpclient.execute(httpGet);
    
    //响应的response对象
    System.out.println("【 响应对象  】 \n"+response);
    //响应的状态行
    System.out.println("【 响应的状态行 】 \n"+response.getStatusLine());
    //获得响应状态行的状态码
    System.out.println("【 响应的状态行的状态码 】 \n"+response.getStatusLine().getStatusCode());

    //响应实体
    System.out.println("【 响应实体 】 \n"+response.getEntity());
        
    //遍历响应所有的消息头
    System.out.println("=====================【 遍历打印所有的消息头】======================");
    Header[] headers=response.getAllHeaders();
    for(Header header:headers){
        System.out.println(header.getName()+"======="+header.getValue());
    }
    
    //获取特定的响应头
    System.out.println("=====================【 获取特定响应头(Server) 】======================\n"+response.getHeaders("Server")[0].getName()+"-----------------"+response.getHeaders("Server")[0].getValue());
    
    //将响应的页面转化成字符串
    System.out.println("=====================【 将响应的页面转化成字符串 】=========================");
    HttpEntity entity=response.getEntity();
    String html=EntityUtils.toString(entity,"UTF-8");
    System.out.println(html);
    
    //关闭连接
    httpclient.close();
}