HttpClient

了解get和post区别，参考这里

无非是代码模拟人工点击浏览器

3个步骤

打开浏览器

  CloseableHttpClient httpClient = HttpClients.createDefault();

输入网址

 HttpGet httpGet = new HttpGet("网址....");

回车，返回界面

 CloseableHttpResponse  response = httpClient.execute(httpGet);

Get无参

查看百度首页内容

public class HttpTest{public static void main(String[] args) {//模拟打开浏览器CloseableHttpClient httpClient = HttpClients.createDefault();//创建GET请求，设置URL访问地址HttpGet httpGet = new HttpGet("http://www.baidu.com");CloseableHttpResponse response=null;try {//使用HttpClient发起请求，获取responseresponse = httpClient.execute(httpGet);//解析响应if(response!=null){//输出getStatusLine()// 成功 HTTP/1.1 200 OK// 失败 HTTP/1.1 403 Forbidden//获取状态码，如 200 或者403System.out.println(response.getStatusLine().getStatusCode());HttpEntity entity = response.getEntity();//实体String content = EntityUtils.toString(entity, "utf8");//把实体转为stringSystem.out.println(content);}} catch (IOException e) {e.printStackTrace();}finally {//关闭,节省资源try {response.close();} catch (IOException e) {e.printStackTrace();}finally {try {httpClient.close();} catch (IOException e) {e.printStackTrace();}}}}
}

Get有参

输入网址也有参数啊，不能光

http://www.baidu.com 啊

比如访问百度百科，这是有参数的

  https://baike.baidu.com/item/0/11071655?fr=aladdin

由于httpGet的参数也能是URI，而URI的创建需要URIbuilder，所以

public class HttpTest{public static void main(String[] args) throws URISyntaxException {//模拟打开浏览器CloseableHttpClient httpClient = HttpClients.createDefault();//构造带参数的地址//https://baike.baidu.com/item/0/11071655?fr=aladdinURIBuilder uriBuilder = new URIBuilder("https://baike.baidu.com/item/0/11071655");uriBuilder.setParameter("fr","aladdin");//参数//创建GET请求，设置URI访问地址HttpGet httpGet = new HttpGet(uriBuilder.build());CloseableHttpResponse response=null;try {//使用HttpClient发起请求，获取responseresponse = httpClient.execute(httpGet);//解析响应if(response!=null){System.out.println(response.getStatusLine());HttpEntity entity = response.getEntity();String content = EntityUtils.toString(entity, "utf8");System.out.println(content);}} catch (IOException e) {e.printStackTrace();}finally {//关闭responsetry {response.close();} catch (IOException e) {e.printStackTrace();}finally {try {httpClient.close();} catch (IOException e) {e.printStackTrace();}}}}
}

无参post

和无参get差不多，只需改变一行

HttpGet httpGet = new HttpGet("网址....");
改为
HttpPost httpPost = new HttpPost("网址....");

带参post

public class HttpTest{public static void main(String[] args) throws URISyntaxException, UnsupportedEncodingException {//模拟打开浏览器CloseableHttpClient httpClient = HttpClients.createDefault();//https://baike.baidu.com/item/0/11071655?fr=aladdinHttpPost httpPost = new HttpPost("https://baike.baidu.com/item/0/11071655");//声明list集合，封装表单的中的参数ArrayList<NameValuePair> params = new ArrayList<>();params.add(new BasicNameValuePair("fr","aladdin"));//创建表单的Entity对象，参数为表单数据和编码UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(params, "utf8");//将表单Entity对象加入到post请求中httpPost.setEntity(formEntity);CloseableHttpResponse response=null;try {//使用HttpClient发起请求，获取responseresponse = httpClient.execute(httpPost);//解析响应if(response!=null){System.out.println(response.getStatusLine());HttpEntity entity = response.getEntity();String content = EntityUtils.toString(entity, "utf8");System.out.println(content);}} catch (IOException e) {e.printStackTrace();}finally {//关闭responsetry {response.close();} catch (IOException e) {e.printStackTrace();}finally {try {httpClient.close();} catch (IOException e) {e.printStackTrace();}}}}
}));

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HttpClient post 与get

HttpClient

Get无参

Get有参

无参post

带参post

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