1.pom.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>tcl.down.url</groupId>
<artifactId>downurl</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>net.sf.json-lib</groupId>
<artifactId>json-lib</artifactId>
<version>2.4</version>
<classifier>jdk15</classifier>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.5</version>
</dependency>
<dependency>
<groupId>commons-httpclient</groupId>
<artifactId>commons-httpclient</artifactId>
<version>3.1</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<mainClass>downurl.Iputil</mainClass>
</configuration>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
2.实现代码的方法
package downurl;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
public class DownUrl {
/**
* @从制定URL下载文件并保存到指定目录
* @param filePath 文件将要保存的目录
* @param method 请求方法,包括POST和GET
* @param url 请求的路径
* @return
*/
public static File saveUrlAs(String url,String filePath,String method){
//System.out.println("fileName---->"+filePath);
//创建不同的文件夹目录
File file=new File(filePath);
//判断文件夹是否存在
if (!file.exists())
{
//如果文件夹不存在,则创建新的的文件夹
file.mkdirs();
}
FileOutputStream fileOut = null;
HttpURLConnection conn = null;
InputStream inputStream = null;
try
{
// 建立链接
URL httpUrl=new URL(url);
conn=(HttpURLConnection) httpUrl.openConnection();
//以Post方式提交表单,默认get方式
conn.setRequestMethod(method);
conn.setDoInput(true);
conn.setDoOutput(true);
// post方式不能使用缓存
conn.setUseCaches(false);
//连接指定的资源
conn.connect();
//获取网络输入流
inputStream=conn.getInputStream();
BufferedInputStream bis = new BufferedInputStream(inputStream);
//判断文件的保存路径后面是否以/结尾
if (!filePath.endsWith("/")) {
filePath += "/";
}
//写入到文件(注意文件保存路径的后面一定要加上文件的名称)
fileOut = new FileOutputStream(filePath+url.substring(url.lastIndexOf("/")+1,url.lastIndexOf("?")));
BufferedOutputStream bos = new BufferedOutputStream(fileOut);
byte[] buf = new byte[4096];
int length = bis.read(buf);
//保存文件
while(length != -1)
{
bos.write(buf, 0, length);
length = bis.read(buf);
}
bos.close();
bis.close();
conn.disconnect();
} catch (Exception e)
{
e.printStackTrace();
System.out.println("抛出异常!!");
}
return file;
}
/**
* @param args
*/
public static void main(String[] args)
{
String photoUrl = "http://datacenter1.oss-cn-hangzhou.dasd.com/logclean/huannet/da/date%3D2020-06-01/part-dasda-07477e29-b6da-40b5-8c09-af5c4067606f-c000.snappy.parquet?Expires=1594915200&OSSAccessKeyId=dsa&Signature=4qATSNRtaW4u3TQsjPb%2B73KzqkM%3D"; //文件URL地址
// String fileName = photoUrl.substring(photoUrl.lastIndexOf("/")); //为下载的文件命名
String fileName = "/tupian";
String filePath = "e:"; //保存目录
File file = saveUrlAs(photoUrl, filePath + fileName,"GET");
}
}