1.需要引入的包，
httpclient-4.5.13.jar
httpcore-4.4.14.jar

2.代码如下

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.TrustSelfSignedStrategy;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.ssl.SSLContexts;



public class FileMethod2 {


	public static void main(String[] args) {
		String url = "https://ip地址/1.zip";
		String dir = "d://202111";
		String fileName = "test.zip";
		downloadHttpUrl(url, dir, fileName);
		System.out.println("完成");
	}
	
	
	
    /**
	 * 下载文件---返回下载后的文件存储路径
	 * 
	 * @param url 文件地址
	 * @param dir 存储目录 
	 * @param fileName 存储文件名
	 * @return
	 */
	public static void downloadHttpUrl(String url, String dir, String fileName) {
		try {
			File dirfile = new File(dir);  
	        if (!dirfile.exists()) {  
	        	dirfile.mkdirs();
	        }
	        
	        SSLConnectionSocketFactory scsf = new SSLConnectionSocketFactory(
	        	     SSLContexts.custom().loadTrustMaterial(null, new TrustSelfSignedStrategy()).build(), 
	        	        NoopHostnameVerifier.INSTANCE);
	        CloseableHttpClient	client = HttpClients.custom().setSSLSocketFactory(scsf).build();
            HttpGet httpget = new HttpGet(url);
            HttpResponse response = client.execute(httpget);
            HttpEntity entity = response.getEntity();
            InputStream is = entity.getContent();
            
            int cache = 10 * 1024;
            FileOutputStream fileout = new FileOutputStream(dir+"/"+fileName);
            byte[] buffer = new byte[cache];
            int ch = 0;
            while ((ch = is.read(buffer)) != -1) {
                fileout.write(buffer, 0, ch);
            }
            is.close();
            fileout.flush();
            fileout.close();
			
		} catch (Exception e) {
			e.printStackTrace();
		}
		
	}
	
	
}