伺服器端實現檔案的上傳和下載

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import java.io.BufferedReader;

import java.io.File;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.net.URL;

 

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.entity.mime.MultipartEntity;

import org.apache.http.entity.mime.content.FileBody;

import org.apache.http.impl.client.DefaultHttpClient;

 

 

/**

 * 檔案上傳和下載

 * @author 20170323

 *

 */

public class FileNetUploadAndDownload {

    /**

     * 檔案上傳

     * @param String 檔案上傳路徑

     * @param String 檔案本地路徑

     * @return

     * @throws Exception

     */

    public String fileUpload(String urlPath,String fileLocation) throws Exception{

       String res = "";

       //建立串連用戶端

       HttpClient httpclient = new DefaultHttpClient();

       //串連伺服器

       HttpPost httppost = new HttpPost(urlPath);

       //負載檔案

       FileBody file = new FileBody(new File(fileLocation));

       //初始化載入器？

       MultipartEntity reqEntity = new MultipartEntity();

       //負載檔案

       reqEntity.addPart("file", file);

       //載入載入器

       httppost.setEntity(reqEntity);

       //準備發送資料（？？）

       HttpResponse response = httpclient.execute(httppost);

       //準備發送資料（？？）

       HttpEntity httpEntity = response.getEntity();

       //產生流

       BufferedReader br = new BufferedReader(new InputStreamReader(httpEntity.getContent(), "UTF-8"));

       StringBuffer backData = new StringBuffer();

       String line = null;

       //發送

       while ((line = br.readLine()) != null) {

           backData.append(line);

       }

       res = backData.toString();

       System.out.println(res);

       return res;

    }

   

    /**

     * 檔案下載

     * @param String 下載路徑

     * @param String 檔案名稱

     * @param String 本機存放區路徑

     * @return

     * @throws Exception

     */

    public String fileDownload(String fileNetPath,String FileName,String UpFilePath) throws Exception{

       //串連伺服器

       URL url = new URL(fileNetPath);

       //產生流

       InputStream is = url.openStream();

      

       //產生本地檔案

       UpFilePath +="/"+FileName;

       File outFlie = new File(UpFilePath);

       if(!outFlie.getParentFile().exists()){

           outFlie.getParentFile().mkdir();

       }

       if(!outFlie.exists()){

           outFlie.createNewFile();

       }

       OutputStream output = new FileOutputStream(outFlie);

       int temp = 0;

       //寫入檔案

       while((temp = is.read()) != -1){

           output.write(temp);

       }

       is.close();

       output.close();

       System.out.println(is);

       return UpFilePath;

    }

}

 

伺服器端實現檔案的上傳和下載