HttpClient基本使用
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1.在pom.xml加入对httpclient的必需的jar包的依赖
<!--//httpclient的接口基本都在这儿--> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.2</version> </dependency> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient-cache</artifactId> <version>4.5</version> </dependency> <dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpmime</artifactId> <version>4.3.2</version> </dependency>
注意:常见的MIME类型(通用型):
xml文档 .xml text/xml
XHTML文档 .xhtml application/xhtml+xml
普通文本 .txt text/plain
RTF文本 .rtf application/rtf
PDF文档 .pdf application/pdf
Microsoft Word文件 .word application/msword
PNG图像 .png image/png
GIF图形 .gif image/gif
JPEG图形 .jpeg,.jpg image/jpeg
au声音文件 .au audio/basic
MIDI音乐文件 mid,.midi audio/midi,audio/x-midi
RealAudio音乐文件 .ra, .ram audio/x-pn-realaudio
MPEG文件 .mpg,.mpeg video/mpeg
AVI文件 .avi video/x-msvideo
TAR文件 .tar application/x-tar
任意的二进制数据 application/octet-stream
2.抓取网页的内容并打印到控制台的demo
package com.zhouhe.modules.api.test; import java.io.IOException; import java.io.InputStream; import org.apache.http.HttpEntity; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.util.EntityUtils; /** * Created by zhouhe on 2019/3/14 8:52 */ public class Test { public static void main(String[] args) { // TODO Auto-generated method stub String url="http://www.baidu.com"; //1.使用默认的配置的httpclient CloseableHttpClient client = HttpClients.createDefault(); //2.使用get方法 HttpGet httpGet = new HttpGet(url); InputStream inputStream = null; CloseableHttpResponse response = null; try { //3.执行请求,获取响应 response = client.execute(httpGet); //看请求是否成功,这儿打印的是http状态码 System.out.println(response.getStatusLine().getStatusCode()); //4.获取响应的实体内容,就是我们所要抓取得网页内容 HttpEntity entity = response.getEntity(); //5.将其打印到控制台上面 //方法一:使用EntityUtils if (entity != null) { System.out.println(EntityUtils.toString(entity, "utf-8")); } EntityUtils.consume(entity); //方法二 :使用inputStream /* if (entity != null) { inputStream = entity.getContent(); BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream)); String line = ""; while ((line = bufferedReader.readLine()) != null) { System.out.println(line); } }*/ } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { if (inputStream != null) { try { inputStream.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if (response != null) { try { response.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } }
原文网址:
https://www.cnblogs.com/LuckyBao/p/6096145.html
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