服务器端实现文件的上传和下载

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;

/**

* 文件上传和下载

* @author 20170323

*

*/

public class FileNetUploadAndDownload {

/**

* 文件上传

* @param String 文件上传路径

* @param String 文件本地路径

* @return

* @throws Exception

*/

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

String res = "";

//建立连接客户端

HttpClient httpclient = new DefaultHttpClient();

//连接服务器

HttpPost httppost = new HttpPost(urlPath);

//加载文件

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

//初始化加载器？

MultipartEntity reqEntity = new MultipartEntity();

//加载文件

reqEntity.addPart("file", file);

//加载加载器

httppost.setEntity(reqEntity);

//准备发送数据（？？）

HttpResponse response = httpclient.execute(httppost);

//准备发送数据（？？）

HttpEntity httpEntity = response.getEntity();

//生成流

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

StringBuffer backData = new StringBuffer();

String line = null;

//发送

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

backData.append(line);

}

res = backData.toString();

System.out.println(res);

return res;

}

/**

* 文件下载

* @param String 下载路径

* @param String 文件名

* @param String 本地存储路径

* @return

* @throws Exception

*/

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

//连接服务器

URL url = new URL(fileNetPath);

//生成流

InputStream is = url.openStream();

//生成本地文件

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;

//写入文件

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

output.write(temp);

}

is.close();

output.close();

System.out.println(is);

return UpFilePath;

}

}