**本项目采用spring-boot构建， maven工程
添加依赖
pom文件
4.0.0 org.test testDome 0.0.1-SNAPSHOT org.apache.httpcomponents httpclient 4.5.5 com.alibaba fastjson 1.2.47 GET 无参形式
package testDemo;import org.apache.http.Header;import org.apache.http.HttpHost;import org.apache.http.client.config.RequestConfig;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;public class DoGET { public static void main(String[] args) throws Exception {// RequestConfig config = RequestConfig.custom().setRedirectsEnabled(false).build();//不允许重定向// CloseableHttpClient httpClient = HttpClients.custom().setDefaultRequestConfig(config).build();// proxyHost -- 代理ip; proxyPort -- 端口号// int proxyPort = 8000;// String proxyHost = "192.10.2.125";// HttpHost proxy = new HttpHost(proxyHost, proxyPort, "HTTP"); //创建Httpclient对象 CloseableHttpClient httpclient = HttpClients.createDefault(); //get请求(忽略SSL证书)，获取结果 // TODO: 2020/4/27 忽略SSL证书 //创建http GET请求 HttpGet get = new HttpGet("http://www.baidu.com");// CloseableHttpResponse response = httpclient.execute(proxy, get); CloseableHttpResponse response = httpclient.execute(get); try { // 执行请求 response = httpclient.execute(get); // 判断返回状态是否为200 if (response.getStatusLine().getStatusCode() == 200) { //请求体内容 String content = EntityUtils.toString(response.getEntity(), "UTF-8"); //内容 System.out.println("<<" + content + ">>"); System.out.println("内容长度：" + content.length());// Header[] cookie = response.getHeaders("Set-Cookie"); } } finally { if (response != null) { response.close(); } //相当于关闭浏览器 httpclient.close(); } }}GET带参请求
package testDemo;import java.io.File;import java.net.URI;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.utils.URIBuilder;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.util.EntityUtils;public class DoGETParam { public static void main(String[] args) throws Exception { // 创建Httpclient对象 CloseableHttpClient httpclient = HttpClients.createDefault(); // 定义请求的参数 URI uri = new URIBuilder("http://www.baidu.com/s").setParameter("wd", "java").build(); // 创建http GET请求 HttpGet httpGet = new HttpGet(uri); //response 对象 CloseableHttpResponse response = null; try { // 执行http get请求 response = httpclient.execute(httpGet); // 判断返回状态是否为200 if (response.getStatusLine().getStatusCode() == 200) { String content = EntityUtils.toString(response.getEntity(), "UTF-8"); //内容 System.out.println("内容长度：" + content.length()); System.out.println("内容<<：" + content); } } finally { if (response != null) { response.close(); } httpclient.close(); } }}POST无参请求
package testDemo;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.util.EntityUtils;public class DoPOST { public static void main(String[] args) throws Exception { // 创建Httpclient对象 CloseableHttpClient httpclient = HttpClients.createDefault(); // 创建http POST请求 HttpPost httpPost = new HttpPost("http://www.oschina.net/"); //伪装浏览器请求 httpPost.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36"); CloseableHttpResponse response = null; try { // 执行请求 response = httpclient.execute(httpPost); // 判断返回状态是否为200 if (response.getStatusLine().getStatusCode() == 200) { String content = EntityUtils.toString(response.getEntity(), "UTF-8"); //内容写入文件 System.out.println(">>" + content); System.out.println("内容长度：" + content.length()); } else { System.out.println(response.getStatusLine().getStatusCode()); String content = EntityUtils.toString(response.getEntity(), "UTF-8"); System.out.println(">>" + content); } } finally { if (response != null) { response.close(); } httpclient.close(); } }}POST带参请求
package testDemo;import java.io.File;import java.util.ArrayList;import java.util.List;import org.apache.http.NameValuePair;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.CloseableHttpResponse;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.CloseableHttpClient;import org.apache.http.impl.client.HttpClients;import org.apache.http.message.BasicNameValuePair;import org.apache.http.util.EntityUtils;public class DoPOSTParam { public static void main(String[] args) throws Exception { // 创建Httpclient对象 CloseableHttpClient httpclient = HttpClients.createDefault(); // 创建http POST请求 HttpPost httpPost = new HttpPost("http://www.bcia.com.cn/bcia/FAQ/search"); // 设置2个post参数 List parameters = new ArrayList(0); parameters.add(new BasicNameValuePair("lang", "cn")); parameters.add(new BasicNameValuePair("pageNum", "1")); // 构造一个form表单式的实体 UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters); // 将请求实体设置到httpPost对象中 httpPost.setEntity(formEntity); //伪装浏览器 httpPost.setHeader("Referer", "http://www.bcia.com.cn/cjwt.html"); httpPost.setHeader("Host", "www.bcia.com.cn"); httpPost.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36"); CloseableHttpResponse response = null; try { // 执行请求 response = httpclient.execute(httpPost); // 判断返回状态是否为200 if (response.getStatusLine().getStatusCode() == 200) { String content = EntityUtils.toString(response.getEntity(), "UTF-8"); System.out.println("内容" + content); System.out.println("内容长度：" + content.length()); } else System.out.println("内容111" + response.getStatusLine().getStatusCode()); } finally { if (response != null) response.close(); } httpclient.close(); }} 来源地址：https://blog.csdn.net/qq_41369057/article/details/131222505
