【JAVA】通过HttpURLConnection 上传和下载文件（二）

HttpURLConnection文件上传

package com.util;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Iterator;
import java.util.Map;

/**
* Java原生的API可用于发送HTTP请求，即java.net.URL、java.net.URLConnection，这些API很好用、很常用，
* 但不够简便；
*
* 1.通过统一资源定位器（java.net.URL）获取连接器（java.net.URLConnection） 2.设置请求的参数 3.发送请求
* 4.以输入流的形式获取返回内容 5.关闭输入流
*
* @author H__D
*
*/
public class HttpConnectionUtil {

/**
*
* @param urlPath
*            下载路径
* @param downloadDir
*            下载存放目录
* @return 返回下载文件
*/
public static File downloadFile(String urlPath, String downloadDir) {
File file = null;
try {
// 统一资源
URL url = new URL(urlPath);
// 连接类的父类，抽象类
URLConnection urlConnection = url.openConnection();
// http的连接类
HttpURLConnection httpURLConnection = (HttpURLConnection) urlConnection;
// 设定请求的方法，默认是GET
httpURLConnection.setRequestMethod("POST");
// 设置字符编码
httpURLConnection.setRequestProperty("Charset", "UTF-8");
// 打开到此 URL 引用的资源的通信链接（如果尚未建立这样的连接）。
httpURLConnection.connect();

// 文件大小
int fileLength = httpURLConnection.getContentLength();

// 文件名
String filePathUrl = httpURLConnection.getURL().getFile();
String fileFullName = filePathUrl.substring(filePathUrl.lastIndexOf(File.separatorChar) + 1);

System.out.println("file length---->" + fileLength);

URLConnection con = url.openConnection();

BufferedInputStream bin = new BufferedInputStream(httpURLConnection.getInputStream());

String path = downloadDir + File.separatorChar + fileFullName;
file = new File(path);
if (!file.getParentFile().exists()) {
file.getParentFile().mkdirs();
}
OutputStream out = new FileOutputStream(file);
int size = 0;
int len = 0;
byte[] buf = new byte[1024];
while ((size = bin.read(buf)) != -1) {
len += size;
out.write(buf, 0, size);
// 打印下载百分比
// System.out.println("下载了-------> " + len * 100 / fileLength +
// "%\n");
}
bin.close();
out.close();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
return file;
}

}

public static void main(String[] args) {

// 下载文件测试
downloadFile("http://localhost:8080/images/1467523487190.png", "/Users/H__D/Desktop");

}

}