java文件接收代码,上传文件java代码

ajax上传文件后，后台java如何接收（求后台接收的完整代码）

写一个servlet或jsp来接收，在servlet或jsp处理业务逻辑，后返回处理结果或新的数据

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如jsp：

%@ page errorPage="/common/error/error.jsp" %

%@ page contentType="text/html;charset=GBK"%

%

String planeNumber = request.getParameter("planeNumber");

String planeType = com.aerolink.aocs.system.parameter.list.PlaneTypeFactory.getPlaneType(planeNumber);

response.getWriter().write(planeType);%

Java服务器怎么接收手机上传过来的文件。求具体代码，谢谢，如果觉得悬赏太少的话可以说，我再加。急。。

android客户端代码:

public class MainActivity extends Activity

{

private TextView uploadInfo;

@Override

protected void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

uploadInfo = (TextView) findViewById(R.id.upload_info);

uploadFile();

}

public void uploadFile()

{

//服务器端地址

String url = "";

//手机端要上传的文件，首先要保存你手机上存在该文件

String filePath = Environment.getExternalStorageDirectory()

+ "/1/power.apk";

AsyncHttpClient httpClient = new AsyncHttpClient();

RequestParams param = new RequestParams();

try

{

param.put("file", new File(filePath));

param.put("content", "liucanwen");

httpClient.post(url, param, new AsyncHttpResponseHandler()

{

@Override

public void onStart()

{

super.onStart();

uploadInfo.setText("正在上传...");

}

@Override

public void onSuccess(String arg0)

{

super.onSuccess(arg0);

Log.i("ck", "success" + arg0);

if(arg0.equals("success"))

{

Toast.makeText(MainActivity.this, "上传成功！", 1000).show();

}

uploadInfo.setText(arg0);

}

@Override

public void onFailure(Throwable arg0, String arg1)

{

super.onFailure(arg0, arg1);

uploadInfo.setText("上传失败！");

}

});

} catch (FileNotFoundException e)

{

e.printStackTrace();

Toast.makeText(MainActivity.this, "上传文件不存在！", 1000).show();

}

}

}

服务器端代码：

public class UploadFileServlet extends HttpServlet

{

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException

{

response.setContentType("text/html");

PrintWriter out = response.getWriter();

// 创建文件项目工厂对象

DiskFileItemFactory factory = new DiskFileItemFactory();

// 设置文件上传路径

String upload = this.getServletContext().getRealPath("/upload/");

// 获取系统默认的临时文件保存路径，该路径为Tomcat根目录下的temp文件夹

String temp = System.getProperty("java.io.tmpdir");

// 设置缓冲区大小为 5M

factory.setSizeThreshold(1024 * 1024 * 5);

// 设置临时文件夹为temp

factory.setRepository(new File(temp));

// 用工厂实例化上传组件,ServletFileUpload 用来解析文件上传请求

ServletFileUpload servletFileUpload = new ServletFileUpload(factory);

// 解析结果放在List中

try

{

ListFileItem list = servletFileUpload.parseRequest(request);

for (FileItem item : list)

{

String name = item.getFieldName();

InputStream is = item.getInputStream();

if (name.contains("content"))

{

System.out.println(inputStream2String(is));

} else if(name.contains("file"))

{

try

{

inputStream2File(is, upload + "\\" + item.getName());

} catch (Exception e)

{

e.printStackTrace();

}

}

}

out.write("success");

} catch (FileUploadException e)

{

e.printStackTrace();

out.write("failure");

}

out.flush();

out.close();

}

// 流转化成字符串

public static String inputStream2String(InputStream is) throws IOException

{

ByteArrayOutputStream baos = new ByteArrayOutputStream();

int i = -1;

while ((i = is.read()) != -1)

{

baos.write(i);

}

return baos.toString();

}

// 流转化成文件

public static void inputStream2File(InputStream is, String savePath)

throws Exception

{

System.out.println("文件保存路径为:" + savePath);

File file = new File(savePath);

InputStream inputSteam = is;

BufferedInputStream fis = new BufferedInputStream(inputSteam);

FileOutputStream fos = new FileOutputStream(file);

int f;

while ((f = fis.read()) != -1)

{

fos.write(f);

}

fos.flush();

fos.close();

fis.close();

inputSteam.close();

}

}

急求Java文件传输源代码？？？急用！！！多谢各位了！！！

.服务器端

package sterning;

import java.io.BufferedInputStream;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.net.ServerSocket;

import java.net.Socket;

public class ServerTest {

int port = 8821;

void start() {

Socket s = null;

try {

ServerSocket ss = new ServerSocket(port);

while (true) {

// 选择进行传输的文件

String filePath = "D:\\lib.rar";

File fi = new File(filePath);

System.out.println("文件长度:" + (int) fi.length());

// public Socket accept() throws

// IOException侦听并接受到此套接字的连接。此方法在进行连接之前一直阻塞。

s = ss.accept();

System.out.println("建立socket链接");

DataInputStream dis = new DataInputStream(new BufferedInputStream(s.getInputStream()));

dis.readByte();

DataInputStream fis = new DataInputStream(new BufferedInputStream(new FileInputStream(filePath)));

DataOutputStream ps = new DataOutputStream(s.getOutputStream());

//将文件名及长度传给客户端。这里要真正适用所有平台，例如中文名的处理，还需要加工，具体可以参见Think In Java 4th里有现成的代码。

ps.writeUTF(fi.getName());

ps.flush();

ps.writeLong((long) fi.length());

ps.flush();

int bufferSize = 8192;

byte[] buf = new byte[bufferSize];

while (true) {

int read = 0;

if (fis != null) {

read = fis.read(buf);

}

if (read == -1) {

break;

}

ps.write(buf, 0, read);

}

ps.flush();

// 注意关闭socket链接哦，不然客户端会等待server的数据过来，

// 直到socket超时，导致数据不完整。

fis.close();

s.close();

System.out.println("文件传输完成");

}

} catch (Exception e) {

e.printStackTrace();

}

}

public static void main(String arg[]) {

new ServerTest().start();

}

}

2.socket的Util辅助类

package sterning;

import java.net.*;

import java.io.*;

public class ClientSocket {

private String ip;

private int port;

private Socket socket = null;

DataOutputStream out = null;

DataInputStream getMessageStream = null;

public ClientSocket(String ip, int port) {

this.ip = ip;

this.port = port;

}

/** *//**

* 创建socket连接

*

* @throws Exception

* exception

*/

public void CreateConnection() throws Exception {

try {

socket = new Socket(ip, port);

} catch (Exception e) {

e.printStackTrace();

if (socket != null)

socket.close();

throw e;

} finally {

}

}

public void sendMessage(String sendMessage) throws Exception {

try {

out = new DataOutputStream(socket.getOutputStream());

if (sendMessage.equals("Windows")) {

out.writeByte(0x1);

out.flush();

return;

}

if (sendMessage.equals("Unix")) {

out.writeByte(0x2);

out.flush();

return;

}

if (sendMessage.equals("Linux")) {

out.writeByte(0x3);

out.flush();

} else {

out.writeUTF(sendMessage);

out.flush();

}

} catch (Exception e) {

e.printStackTrace();

if (out != null)

out.close();

throw e;

} finally {

}

}

public DataInputStream getMessageStream() throws Exception {

try {

getMessageStream = new DataInputStream(new BufferedInputStream(socket.getInputStream()));

return getMessageStream;

} catch (Exception e) {

e.printStackTrace();

if (getMessageStream != null)

getMessageStream.close();

throw e;

} finally {

}

}

public void shutDownConnection() {

try {

if (out != null)

out.close();

if (getMessageStream != null)

getMessageStream.close();

if (socket != null)

socket.close();

} catch (Exception e) {

}

}

}

3.客户端

package sterning;

import java.io.BufferedOutputStream;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.FileOutputStream;

public class ClientTest {

private ClientSocket cs = null;

private String ip = "localhost";// 设置成服务器IP

private int port = 8821;

private String sendMessage = "Windwos";

public ClientTest() {

try {

if (createConnection()) {

sendMessage();

getMessage();

}

} catch (Exception ex) {

ex.printStackTrace();

}

}

private boolean createConnection() {

cs = new ClientSocket(ip, port);

try {

cs.CreateConnection();

System.out.print("连接服务器成功!" + "\n");

return true;

} catch (Exception e) {

System.out.print("连接服务器失败!" + "\n");

return false;

}

}

private void sendMessage() {

if (cs == null)

return;

try {

cs.sendMessage(sendMessage);

} catch (Exception e) {

System.out.print("发送消息失败!" + "\n");

}

}

private void getMessage() {

if (cs == null)

return;

DataInputStream inputStream = null;

try {

inputStream = cs.getMessageStream();

} catch (Exception e) {

System.out.print("接收消息缓存错误\n");

return;

}

try {

//本地保存路径，文件名会自动从服务器端继承而来。

String savePath = "E:\\";

int bufferSize = 8192;

byte[] buf = new byte[bufferSize];

int passedlen = 0;

long len=0;

savePath += inputStream.readUTF();

DataOutputStream fileOut = new DataOutputStream(new BufferedOutputStream(new BufferedOutputStream(new FileOutputStream(savePath))));

len = inputStream.readLong();

System.out.println("文件的长度为:" + len + "\n");

System.out.println("开始接收文件!" + "\n");

while (true) {

int read = 0;

if (inputStream != null) {

read = inputStream.read(buf);

}

passedlen += read;

if (read == -1) {

break;

}

//下面进度条本为图形界面的prograssBar做的，这里如果是打文件，可能会重复打印出一些相同的百分比

System.out.println("文件接收了" + (passedlen * 100/ len) + "%\n");

fileOut.write(buf, 0, read);

}

System.out.println("接收完成，文件存为" + savePath + "\n");

fileOut.close();

} catch (Exception e) {

System.out.println("接收消息错误" + "\n");

return;

}

}

public static void main(String arg[]) {

new ClientTest();

}

}

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