使用node.js服务器使用java上传。req.files为空
我正在尝试使用javaFX将文件上载到node.js服务器 此代码用于node.js服务器上载我的文件 简化了我的代码使用node.js服务器使用java上传。req.files为空,java,node.js,express,upload,server,Java,Node.js,Express,Upload,Server,我正在尝试使用javaFX将文件上载到node.js服务器 此代码用于node.js服务器上载我的文件 简化了我的代码 var express = require('express'); var path = require('path'); var logger = require('morgan'); var methodOverride = require('method-override'); var app = express(); var bodyParser = requ
var express = require('express');
var path = require('path');
var logger = require('morgan');
var methodOverride = require('method-override');
var app = express();
var bodyParser = require('body-parser');
var methodOverride = require('method-override');
var argv = require('optimist').argv;
var fs = require('fs');
app.use('/js', express.static(__dirname + '/js'));
app.use(morgan('dev'));
app.use(methodOverride());
app.use(bodyParser({keepExtensions:true,uploadDir:path.join(__dirname,'/files')}));
var busboy = require('connect-busboy');
app.use(busboy());
var fileupload = require('fileupload').createFileUpload('/home/kimmj8409/Myweb_front_end').middleware
app.post('/upload', fileupload, function(req, res) {
res.send(req.body);
})
app.listen(8080, argv.fe_ip);
console.log("App listening on port 8080");
与node.js服务器连接的是Java代码
multipartity.java
public class MultipartUtility {
private final String boundary;
private static final String LINE_FEED = "\r\n";
private HttpURLConnection httpConn;
private String charset;
private OutputStream outputStream;
private PrintWriter writer;
public MultipartUtility(String requestURL, String charset)
throws IOException {
this.charset = charset;
boundary = "===" + System.currentTimeMillis() + "===";
URL url = new URL(requestURL);
httpConn = (HttpURLConnection) url.openConnection();
httpConn.setUseCaches(false);
httpConn.setDoOutput(true);
httpConn.setDoInput(true);
httpConn.setRequestProperty("Content-Type",
"multipart/form-data; boundary=" + boundary);
httpConn.setRequestProperty("User-Agent", "CodeJava Agent");
httpConn.setRequestProperty("Test", "Bonjour");
outputStream = httpConn.getOutputStream();
writer = new PrintWriter(new OutputStreamWriter(outputStream, charset),
true);
}
public void addFormField(String name, String value) {
writer.append("--" + boundary).append(LINE_FEED);
writer.append("Content-Disposition: form-data; name=\"" + name + "\"")
.append(LINE_FEED);
writer.append("Content-Type: text/plain; charset=" + charset).append(
LINE_FEED);
writer.append(LINE_FEED);
writer.append(value).append(LINE_FEED);
writer.flush();
}
public void addFilePart(String fieldName, File uploadFile)
throws IOException {
String fileName = uploadFile.getName();
writer.append("--" + boundary).append(LINE_FEED);
writer.append(
"Content-Disposition: form-data; name=\"" + fieldName
+ "\"; filename=\"" + fileName + "\"")
.append(LINE_FEED);
writer.append(
"Content-Type: "
+ URLConnection.guessContentTypeFromName(fileName))
.append(LINE_FEED);
writer.append("Content-Transfer-Encoding: binary").append(LINE_FEED);
writer.append(LINE_FEED);
writer.flush();
FileInputStream inputStream = new FileInputStream(uploadFile);
byte[] buffer = new byte[4096];
int bytesRead = -1;
while ((bytesRead = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
}
outputStream.flush();
inputStream.close();
writer.append(LINE_FEED);
writer.flush();
}
public void addHeaderField(String name, String value) {
writer.append(name + ": " + value).append(LINE_FEED);
writer.flush();
}
public List<String> finish() throws IOException {
List<String> response = new ArrayList<String>();
writer.append(LINE_FEED).flush();
writer.append("--" + boundary + "--").append(LINE_FEED);
writer.close();
// checks server's status code first
int status = httpConn.getResponseCode();
if (status == HttpURLConnection.HTTP_OK) {
BufferedReader reader = new BufferedReader(new InputStreamReader(
httpConn.getInputStream()));
String line = null;
while ((line = reader.readLine()) != null) {
response.add(line);
}
reader.close();
httpConn.disconnect();
} else {
throw new IOException("Server returned non-OK status: " + status);
}
return response;
}
}
公共类多功能{
私有最终字符串边界;
私有静态最终字符串行\u FEED=“\r\n”;
专用HttpURLConnection httpConn;
私有字符串字符集;
私有输出流输出流;
私人版画作家;
公共多功能(字符串请求URL、字符串字符集)
抛出IOException{
this.charset=charset;
boundary=“==”+System.currentTimeMillis()+”==”;
URL=新URL(请求URL);
httpConn=(HttpURLConnection)url.openConnection();
httpConn.setUseCaches(假);
httpConn.setDoOutput(真);
httpConn.setDoInput(真);
httpConn.setRequestProperty(“内容类型”,
“多部分/表单数据;边界=”+边界);
setRequestProperty(“用户代理”、“代码Java代理”);
httpConn.setRequestProperty(“测试”,“你好”);
outputStream=httpConn.getOutputStream();
writer=新的PrintWriter(新的OutputStreamWriter(outputStream,字符集),
正确的);
}
public void addFormField(字符串名称、字符串值){
writer.append(“-”+边界).append(换行符);
writer.append(“内容处置:表单数据;名称=\”“+name+\”“”)
.append(换行符);
writer.append(“内容类型:text/plain;charset=“+charset”).append(
线路(U馈电);
writer.append(换行符);
writer.append(值).append(换行符);
writer.flush();
}
public void addFilePart(字符串字段名,文件上传文件)
抛出IOException{
字符串文件名=uploadFile.getName();
writer.append(“-”+边界).append(换行符);
writer.append(
“内容处置:表单数据;名称=\”“+fieldName”
+“\”文件名=\”+文件名+“\”)
.append(换行符);
writer.append(
“内容类型:”
+URLConnection.guessContentTypeFromName(文件名))
.append(换行符);
writer.append(“内容传输编码:二进制”).append(换行符);
writer.append(换行符);
writer.flush();
FileInputStream inputStream=新的FileInputStream(上传文件);
字节[]缓冲区=新字节[4096];
int字节读取=-1;
而((bytesRead=inputStream.read(缓冲区))!=-1){
写入(缓冲区,0,字节读取);
}
outputStream.flush();
inputStream.close();
writer.append(换行符);
writer.flush();
}
public void addHeaderField(字符串名称、字符串值){
writer.append(name+”:“+value).append(LINE\u FEED);
writer.flush();
}
public List finish()引发IOException{
列表响应=新建ArrayList();
writer.append(LINE_FEED.flush();
writer.append(“-”+边界+“-”).append(换行符);
writer.close();
//首先检查服务器的状态代码
int status=httpConn.getResponseCode();
if(status==HttpURLConnection.HTTP\u OK){
BufferedReader reader=新的BufferedReader(新的InputStreamReader(
httpConn.getInputStream());
字符串行=null;
而((line=reader.readLine())!=null){
响应。添加(行);
}
reader.close();
httpConn.disconnect();
}否则{
抛出新IOException(“服务器返回非OK状态:+状态”);
}
返回响应;
}
}
主要代码:
private void TCP_File_Client() throws IOException{
String url = PATH +"/upload";
String charset = "UTF-8";
String param = "value";
File textFile = new File(data_n3_PATH);
File binaryFile = new File(data_n3_PATH);
String boundary = Long.toHexString(System.currentTimeMillis());
String CRLF = "\r\n";
URLConnection connection = new URL(url).openConnection();
HttpURLConnection http = (HttpURLConnection) connection;
http.setRequestMethod("POST");
connection.setDoOutput(true);
connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
File uploadFile1 = new File(data_n3_PATH);
File uploadFile2 = new File(data_n3_PATH);
String requestURL = PATH +"/upload";
try {
MultipartUtility multipart = new MultipartUtility(requestURL, charset);
multipart.addHeaderField("User-Agent", "CodeJava");
multipart.addHeaderField("Test-Header", "Header-Value");
multipart.addFormField("description", "Cool Pictures");
multipart.addFormField("keywords", "Java,upload,Spring");
multipart.addFilePart("fileUpload", uploadFile1);
multipart.addFilePart("fileUpload", uploadFile2);
List<String> response = multipart.finish();
System.out.println("SERVER REPLIED:");
for (String line : response) {
System.out.println(line);
}
} catch (IOException ex) {
System.err.println(ex);
}
}
private void TCP\u File\u Client()引发IOException{
字符串url=PATH+“/upload”;
字符串charset=“UTF-8”;
字符串param=“value”;
文件textFile=新文件(数据路径);
文件二进制文件=新文件(数据路径);
字符串边界=Long.tohextString(System.currentTimeMillis());
字符串CRLF=“\r\n”;
URLConnection connection=新URL(URL).openConnection();
HttpURLConnection http=(HttpURLConnection)连接;
http.setRequestMethod(“POST”);
connection.setDoOutput(真);
connection.setRequestProperty(“内容类型”、“多部分/表单数据;边界=“+boundary”);
文件上传文件1=新文件(数据路径);
文件上传文件2=新文件(数据路径);
字符串requestURL=PATH+“/upload”;
试一试{
multipartity multipart=新的multipartity(请求URL,字符集);
addHeaderField(“用户代理”、“代码Java”);
多部分addHeaderField(“测试标头”、“标头值”);
多部分addFormField(“描述”,“酷图片”);
addFormField(“关键字”、“Java、upload、Spring”);
multipart.addFilePart(“fileUpload”,uploadFile1);
multipart.addFilePart(“fileUpload”,uploadFile2);
列表响应=multipart.finish();
System.out.println(“服务器回复:”);
for(字符串行:响应){
系统输出打印项次(行);
}
}捕获(IOEX异常){
系统错误打印项次(ex);
}
}
通过调试我的代码,我发现POST请求可以转到node.js服务器,但我找不到文件。
req.files为空,我在req中找不到任何类似文件的内容
我收到IOException(“服务器返回非OK状态:“+状态”);拥有500个身份
如何连接这些设备?请阅读。
您可以使用node.js模块multer。阅读。
您可以使用node.js module multer。要测试此功能,您需要测试各个部分。要确认您首先确实发送了一个文件,您可以使用类似于
Fiddler
的东西来查看您发送到NodeJS服务器的HTTP请求。然后,在确认Java代码正确发送文件后,查看NodeJS不工作的原因。谢谢,我正在尝试使用wireshark进行调试。要测试这一点,您需要测试各个部分。要确认一开始确实发送了一个文件,可以使用类似Fiddler的东西