java web 從伺服器上下載圖片資料
阿新 • • 發佈:2019-02-06
package com.Action;
import java.io.File;
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 {
public static final String URL_PATH = "http://cs.pulaipuwang.com/yesilovepjustdoit2014/PartnerImg/1401125174761qiang.jpg"; //例項圖片,實際開發中可能是獲得伺服器上的所有圖片,或者部分圖片,不可能是具體某一張圖片
public HttpUtils() {
// TODO Auto-generated constructor stub
}
//把從伺服器獲得圖片的輸入流InputStream寫到本地磁碟
public static void saveImageToDisk() {
InputStream inputStream = getInputStream();
byte[] data = new byte[1024];
int len = 0;
FileOutputStream fileOutputStream = null;
try {
fileOutputStream = new FileOutputStream("F:\\test2.jpg");
while ((len = inputStream.read(data)) != -1) {
fileOutputStream.write(data, 0, len);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (fileOutputStream != null) {
try {
fileOutputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
// 從伺服器獲得一個輸入流(本例是指從伺服器獲得一個image輸入流)
public static InputStream getInputStream() {
InputStream inputStream = null;
HttpURLConnection httpURLConnection = null;
try {
URL url = new URL(URL_PATH);
httpURLConnection = (HttpURLConnection) url.openConnection();
// 設定網路連線超時時間
httpURLConnection.setConnectTimeout(3000);
// 設定應用程式要從網路連線讀取資料
httpURLConnection.setDoInput(true);
httpURLConnection.setRequestMethod("GET");
int responseCode = httpURLConnection.getResponseCode();
if (responseCode == 200) {
// 從伺服器返回一個輸入流
inputStream = httpURLConnection.getInputStream();
System.out.println(inputStream+"**********************");
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return inputStream;
}
public static void main(String args[]) {
// 從伺服器端獲得圖片,儲存到本地
// saveImageToDisk();
File file= new File("C://Program Files//Apache Software Foundation//Tomcat 6.0//webapps//plpwmanagers//DpImg//"); //得到伺服器上DpImg檔案下所有圖片
String test[];
test=file.list(); //將每張圖片依次存放到 test 陣列中
System.out.println(test.length);
for(int i=0;i<test.length;i++)
{
System.out.println(test[i]);
}
}
}
import java.io.File;
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 {
public static final String URL_PATH = "http://cs.pulaipuwang.com/yesilovepjustdoit2014/PartnerImg/1401125174761qiang.jpg"; //例項圖片,實際開發中可能是獲得伺服器上的所有圖片,或者部分圖片,不可能是具體某一張圖片
public HttpUtils() {
// TODO Auto-generated constructor stub
}
//把從伺服器獲得圖片的輸入流InputStream寫到本地磁碟
public static void saveImageToDisk() {
InputStream inputStream = getInputStream();
byte[] data = new byte[1024];
int len = 0;
FileOutputStream fileOutputStream = null;
try {
fileOutputStream = new FileOutputStream("F:\\test2.jpg");
while ((len = inputStream.read(data)) != -1) {
fileOutputStream.write(data, 0, len);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (fileOutputStream != null) {
try {
fileOutputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
// 從伺服器獲得一個輸入流(本例是指從伺服器獲得一個image輸入流)
public static InputStream getInputStream() {
InputStream inputStream = null;
HttpURLConnection httpURLConnection = null;
try {
URL url = new URL(URL_PATH);
httpURLConnection = (HttpURLConnection) url.openConnection();
// 設定網路連線超時時間
httpURLConnection.setConnectTimeout(3000);
// 設定應用程式要從網路連線讀取資料
httpURLConnection.setDoInput(true);
httpURLConnection.setRequestMethod("GET");
int responseCode = httpURLConnection.getResponseCode();
if (responseCode == 200) {
// 從伺服器返回一個輸入流
inputStream = httpURLConnection.getInputStream();
System.out.println(inputStream+"**********************");
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return inputStream;
}
public static void main(String args[]) {
// 從伺服器端獲得圖片,儲存到本地
// saveImageToDisk();
File file= new File("C://Program Files//Apache Software Foundation//Tomcat 6.0//webapps//plpwmanagers//DpImg//"); //得到伺服器上DpImg檔案下所有圖片
String test[];
test=file.list(); //將每張圖片依次存放到 test 陣列中
System.out.println(test.length);
for(int i=0;i<test.length;i++)
{
System.out.println(test[i]);
}
}
}