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java文件接收代码,上传文件java代码
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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
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);%
相关问答
Q1: 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();
}
}
Q2: 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();
}
}
