前言：
最近产品经理要分析用户的行为数据，于是让我将生产上的数据包都下载下来，用HttpURLConnection和Java的IO流，挺方便，下面简单介绍一下。
下载代码
public static void testDownLoad(){
BufferedInputStream bis =
null;
BufferedOutputStream bos=
null;
String HTTP_URL=
"http://f0.topitme.com/0/7a/63/113144393585b637a0o.jpg";
try {
int contentLength = getConnection(HTTP_URL).getContentLength();
System.
out.println(
"文件的大小是:"+contentLength);
if (contentLength>
32) {
InputStream
is= getConnection(HTTP_URL).getInputStream();
bis =
new BufferedInputStream(
is);
FileOutputStream fos =
new FileOutputStream(
"C:/test/美女.jpg");
bos=
new BufferedOutputStream(fos);
int b =
0;
byte[] byArr =
new byte[
1024];
while((b= bis.read(byArr))!=-
1){
bos.write(byArr,
0, b);
}
System.
out.println(
"下载的文件的大小是----------------------------------------------:"+contentLength);
}
}
catch (Exception e) {
e.printStackTrace();
}
finally{
try {
if(bis !=
null){
bis.close();
}
if(bos !=
null){
bos.close();
}
}
catch (IOException e) {
e.printStackTrace();
}
}
}
连接HttpURLConnection代码
public static HttpURLConnection
getConnection(String httpUrl)
throws Exception {
URL url =
new URL(httpUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod(
"GET");
connection.setRequestProperty(
"Content-Type",
"application/octet-stream");
connection.setDoOutput(
true);
connection.setDoInput(
true);
connection.setRequestProperty(
"Connection",
"Keep-Alive");
connection.connect();
return connection;
}
Main方法调用代码
public static void main(String[] args) {
testDownLoad();
}
下载效果
图片有点性感啊，别介意，连接失效，大家自己在百度上搜一张图片，然后复制图片地址替换代码中的连接即可！
