- public class HttpUtils {
-
-
- private static String url_path ="http://192.168.10.101:8080/myhttp/bg.jpg";
-
- public static void saveImageToDisk() {
- InputStream inputStream = null;
- inputStream = getInputStream();
- byte[] data = new byte[1024];
- int len = 0;
-
- FileOutputStream fileOutputStream = null;
- try {
- fileOutputStream = new FileOutputStream("D:\\test.jpg");
- while ((len = inputStream.read(data))!=-1) {
- fileOutputStream.write(data,0,len);
- }
-
- } catch (FileNotFoundException e) {
-
- e.printStackTrace();
- } catch (IOException e) {
-
- e.printStackTrace();
- }finally{
- if(fileOutputStream!=null){
- try {
- fileOutputStream.close();
- } catch (IOException e) {
-
- e.printStackTrace();
- }
- }
- if(inputStream!=null){
- try {
- inputStream.close();
- } catch (IOException e) {
-
- e.printStackTrace();
- }
- }
- }
-
-
-
- }
-
-
- public static InputStream getInputStream(){
- InputStream inputStream = null;
- HttpURLConnection httpURLConnection = null;
- try {
- URL url = new URL(url_path);
- if (url!=null) {
- httpURLConnection = (HttpURLConnection) url.openConnection();
- httpURLConnection.setConnectTimeout(3000);
- httpURLConnection.setDoInput(true);
- httpURLConnection.setRequestMethod("GET");
- int responseCode = httpURLConnection.getResponseCode();
- if (responseCode == 200) {
-
- inputStream = httpURLConnection.getInputStream();
- }
- }
-
-
- } catch (MalformedURLException e) {
-
- e.printStackTrace();
- } catch (IOException e) {
-
- e.printStackTrace();
- }
- return inputStream;
-
- }
-
- public static void main(String[] args) {
-
- saveImageToDisk();
- }
-
- }
注:http的get方式提交请求的流程:
创建URL;
1)定义InputStream流对象,定义HttpUrlConnection对象;
2)用URL的openConnection函数打开链接返回HttpUrlConnection对象;
3)HttpUrlConnection对象的setConnectTimeOut函数设置链接超时时间;
4)HttpUrlConnection对象的setDoInput函数打开输入流;
5)HttpUrlConnection对象的setRequestMethod函数设置链接方式,即GET或者POST方式;
6)HttpUrlConnection对象的getResponseCode函数返回链接结果,结果为int类型;
结果有这么几种常见的可能:200,请求成功;404资源未找到;500,服务器内部错误;
详见: http状态码/http返回码详解
二.服务器端
http://blog.csdn.net/u012702039/article/details/42224721
以上链接的基础上,在WebContent文件夹下放置一个bg.jpg图片,运行起来,作为服务器端。
如图:
然后再运行客户端程序,即可把服务器端的bg.jpg图片保存为d盘的test.jpg文件。