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根据url获取HttpURLConnection连接类,获取连接中的文件流,再通过输出流把文件内容输出到一个数组中,然后通过输出流输出到指定目录的文件。
以下是测试代码:
package com.test;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
public class Test {
@SuppressWarnings("finally")
public static File downloadFile(String urlPath, String downloadDir) {
File file = null;
try {
URL url = new URL(urlPath);
URLConnection urlConnection = url.openConnection();
HttpURLConnection httpURLConnection = (HttpURLConnection) urlConnection;// http的连接类
//String contentType = httpURLConnection.getContentType();//请求类型,可用来过滤请求,
httpURLConnection.setConnectTimeout(1000*5);//设置超时
httpURLConnection.setRequestMethod("POST");//设置请求方式,默认是GET
httpURLConnection.setRequestProperty("Charset", "UTF-8");// 设置字符编码
httpURLConnection.connect();// 打开连接
BufferedInputStream bin = new BufferedInputStream(httpURLConnection.getInputStream());
String fileName = "1.xlsx";// 指定文件名称
String path = downloadDir + File.separatorChar + fileName;// 指定存放位置
file = new File(path);
// 校验文件夹目录是否存在,不存在就创建一个目录
if (!file.getParentFile().exists()) {
file.getParentFile().mkdirs();
}
OutputStream out = new FileOutputStream(file);
int size = 0;
byte[] b = new byte[2048];
//把输入流的文件读取到字节数据b中,然后输出到指定目录的文件
while ((size = bin.read(b)) != -1) {
out.write(b, 0, size);
}
// 关闭资源
bin.close();
out.close();
System.out.println("文件下载成功!");
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println("文件下载失败!");
} finally {
return file;
}
}
public static void main(String[] args) {
downloadFile("url", "/Users/xxxxx/Desktop/");// 指定资源地址,下载文件测试
}
}