按照文件路徑和文件名創建文件夾及下載文件的一些總結

import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;


import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;


import com.utstar.sobeyadapter.domain.Constant;


@Service
public class DownloadPictureService {
Logger logger = LoggerFactory.getLogger(DownloadPictureService.class);


/**
* 將圖片寫入服務器
* 
* @param picture
* @param fileName
*/
public void writePictureToServer(byte[] picture, String jsondataPath, String fileName) {
try {
File file = new File(jsondataPath);
if (!file.exists()) {
file.mkdirs();
logger.info("創建路徑成功，路徑爲："+jsondataPath);
}
File file2 = new File(jsondataPath, fileName);
if (!file2.exists()) {
try {
file2.createNewFile();
logger.info("創建文件成功，文件名爲："+fileName);
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
String fileEntity = jsondataPath + "/" + fileName;
// String fileEntity = jsondataPath + "//" + fileName;
/*
* FileOutputStream writerStream = new FileOutputStream(fileEntity);
* BufferedWriter writer = new BufferedWriter(new
* OutputStreamWriter(writerStream, "UTF-8")); // BufferedWriter
* writer=new BufferedWriter(new FileWriter(fileEntity));
* writer.write(picture); writer.close();
*/
logger.info("圖片下載到的路徑爲："+fileEntity);
FileOutputStream fileOutputStream = new FileOutputStream(fileEntity);
fileOutputStream.write(picture);
fileOutputStream.flush();
fileOutputStream.close();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}


public byte[] getPictureByUrl(String strUrl) {
try {
logger.info("圖片URL是："+strUrl);
logger.info("-------------------------------開始獲取圖片數據流-------------------------------");
URL url = new URL(strUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(Constant.DownloadPictureTimeout * 1000);//設置鏈接超時時間，單位毫秒
InputStream inputStream = connection.getInputStream();
byte[] bsPicture = readInputStream(inputStream);
if(bsPicture!=null&&bsPicture.length>0){
logger.info("-------------------------------成功獲取圖片數據流-------------------------------");
}
return bsPicture;
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
return null;
}


public byte[] readInputStream(InputStream inStream) {
try {
logger.info("--------進入讀取狀態---------");
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while ((len = inStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, len);
}
inStream.close();
outputStream.close();
return outputStream.toByteArray();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
return null;
}
}