一、
二、
我试了试，Post方式也行啊，干嘛要叫强调Get方式，费解~~
答曰：get是向服务器请求数据，post是提交数据。
三、
package com.hpu.test; import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL; public class HttpUtils {
// 自定义的web服务器的资源
private static String URL_PATH = "http://localhost:8080/TestGet/1.jpg"; public HttpUtils() {
// TODO Auto-generated constructor stub
} public static void saveImageToDisk() throws IOException {
InputStream inputStream = getInputStream();
byte[] data = new byte[1024];
int len = 0;
FileOutputStream fileOutputStream = null;
try {
fileOutputStream = new FileOutputStream("D:\\p.jpg");
while ((len = inputStream.read(data)) != -1) {
fileOutputStream.write(data, 0, len);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (fileOutputStream != null) {
try {
fileOutputStream.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} } /**
* 获得服务器端数据，以InputStream形式返回
*
* @return
* @throws IOException
*/
public static InputStream getInputStream() throws IOException {
InputStream inputStream = null;
HttpURLConnection httpURLConnection = null;
try {
URL url = new URL(URL_PATH);
if (url != null) {
httpURLConnection = (HttpURLConnection) url.openConnection();
// 设置连接网络的超时时间
httpURLConnection.setConnectTimeout(3000);
httpURLConnection.setDoInput(true);
// 设置本次http请求使用get方式请求
httpURLConnection.setRequestMethod("GET");
int responseCode = httpURLConnection.getResponseCode();
if (responseCode == 200) {
// 从服务器获得一个输入流
inputStream = httpURLConnection.getInputStream();
}
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} return inputStream;
} public static void main(String[] args) throws IOException {
// 从服务器获得图片保存到本地
saveImageToDisk();
System.out.println("传输步骤完毕");
}
}
四、IO学习链接