java爬虫之使用HttpClient模拟浏览器发送请求方法详

0. 摘要

0.1 添加依赖

<dependency>
  <groupId>org.apache.httpcomponents</groupId>
  <artifactId>httpclient</artifactId>
  <version>4.5.2</version>
</dependency>

0.2 代码

//1. 打开浏览器 创建httpclient对象
CloseableHttpClient httpClient = HttpClients.createDefault();
//2. 输入网址
HttpGet httpGet = new HttpGet("http://www.baidu.com");
//3. 发送请求
CloseableHttpResponse httpResponse = httpClient.execute(httpGet);
//4. 响应结果
HttpEntity httpEntity = httpResponse.getEntity();
//5. 解析结果
String result = EntityUtils.toString(httpEntity, "utf-8");
System.out.println(result);

1. 实操

1.1 添加依赖

1.1.1 找到 pom.xml 添加依赖

1.1.2 依赖代码

<dependency>
  <groupId>org.apache.httpcomponents</groupId>
  <artifactId>httpclient</artifactId>
  <version>4.5.2</version>
</dependency>

1.2 添加 TestHttpClient 类

1.2.1 创建类文件 com.aifu.TestHttpClient

1.2.2 添加代码

public static void main(String[] args) throws IOException {
  //1. 打开浏览器 创建httpclient对象
  CloseableHttpClient httpClient = HttpClients.createDefault();
  //2. 输入网址
  HttpGet httpGet = new HttpGet("http://www.baidu.com");
  //3. 发送请求
  CloseableHttpResponse httpResponse = httpClient.execute(httpGet);
  //4. 响应结果
  HttpEntity httpEntity = httpResponse.getEntity();
  //5. 解析结果
  String result = EntityUtils.toString(httpEntity, "utf-8");
  System.out.println(result);
}

1.3 运行

1.3.1 点击绿标运行 或者快捷键 ctrl + alt +F10

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