使用@MultipartConfig时，我在使用server-api 3.0时表现得很糟糕。 当我从jsp页面调用servlet时它100％工作，但是当我从我自己的java客户端调用servlet时（使用java.net api） 我得到一个例外。下面是我的源代码和两种情况下的输出。
我正在使用Java 1.6.0，并在apache-tomcat-7.0.11上运行servlet。
Servet：
import java.io.IOException;
import java.io.InputStream;
import java.util.Collection;
import java.util.Enumeration;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
@WebServlet(urlPatterns="/MultipartUploadServlet" , name="MultipartUploadServlet")
@MultipartConfig(location="/tmp", maxFileSize = 10485760L)
public class MultipartUploadServlet extends HttpServlet{
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("MultipartUploadServlet.doPost");
try {
System.out.println("Print out the request header");
Enumeration<String> hn = req.getHeaderNames();
while(hn.hasMoreElements()) {
String n = hn.nextElement();
System.out.println(n + " [" + req.getHeader(n) + "]");
}
Collection<Part> requestParts = req.getParts();
System.out.println("there are [" + requestParts.size() +"] multiparts");
System.out.println("printing out request inputstream");
InputStream is = req.getInputStream();
int charRead = 0;
System.out.println("[");
while((charRead = is.read()) != -1){
System.out.print((char)charRead);
}
is.close();
System.out.println("]");
} catch (Exception excp) {
excp.printStackTrace();
}
}
}
Jsp客户端
<html>
<head></head>
<body>
<p>Commons File Upload Example</p>
<form action="MultipartUploadServlet" enctype="multipart/form-data" method="post">
<input type="file" name="file1"><br>
<input type="Submit" value="Upload File"><br>s
</form>
</body>
</html>
使用jsp客户端在tomcat上输出
host [localhost:8080]
user-agent [Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13]
accept [text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
accept-language [en-us,en;q=0.5]
accept-encoding [gzip,deflate]
accept-charset [ISO-8859-1,utf-8;q=0.7,*;q=0.7]
keep-alive [115]
connection [keep-alive]
referer [http://localhost:8080/scrappyWeb/test.jsp]
cookie [JSESSIONID=06A3E14F91D4B8E558B7438B1D9C7E99]
content-type [multipart/form-data; boundary=---------------------------1137522503144128232716531729]
content-length [223]
there are [1] multiparts
java客户端
package com.scrappy.web.client.compass.verification;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
public class TestClient {
public static void main(String ... aaa) {
System.setProperty("http.keepAlive", "false");
String boundary = "---------------------------" + Long.toHexString(System.currentTimeMillis());
try {
URLConnection connection = new URL("http://localhost:8080/scrappyWeb/MultipartUploadServlet").openConnection();
((HttpURLConnection)connection).setRequestMethod("POST");
((HttpURLConnection)connection).setConnectTimeout(60000);
connection.setRequestProperty("User-Agent", "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13"); // Do as if you're using Firefox 3.6.3.
connection.setDoOutput(true);
connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
connection.setRequestProperty("keep-alive", "115");
connection.setRequestProperty("accept-encoding", "gzip,deflate");
connection.setRequestProperty("connection", "keep-alive");
connection.setRequestProperty("accept-charset","ISO-8859-1,utf-8;q=0.7,*;q=0.7");
connection.setRequestProperty("accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
PrintWriter writer = null;
OutputStream output = connection.getOutputStream();
String charset = "UTF-8";
File textFile = new File("/Users/christiaan/test.txt");
writer = new PrintWriter(new OutputStreamWriter(output, charset), true);
writer.println("--" + boundary);
writer.println("Content-Disposition: form-data; name=\"file1\"; filename=\"" + textFile.getName() + "\"");
writer.println("Content-Type: text/plain");
writer.println();
BufferedReader reader = null;
try {
reader = new BufferedReader(new InputStreamReader(new FileInputStream(textFile), charset));
for (String line; (line = reader.readLine()) != null;) {
writer.println(line);
}
} finally {
if (reader != null) try { reader.close(); } catch (IOException logOrIgnore) {}
}
writer.println(); // Important! Indicates end of binary boundary.
// End of multipart/form-data.
writer.println("--" + boundary + "--");
writer.close();
((HttpURLConnection)connection).getResponseCode();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
使用java客户端在tomcat上输出
user-agent [Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13]
content-type [multipart/form-data; boundary=---------------------------12f24455f6f]
accept-encoding [gzip,deflate]
accept-charset [ISO-8859-1,utf-8;q=0.7,*;q=0.7]
accept [text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
host [localhost:8080]
connection [close]
content-length [183]
java.io.IOException: org.apache.tomcat.util.http.fileupload.FileUploadException: Stream ended unexpectedly
at org.apache.catalina.connector.Request.parseParts(Request.java:2639)
at org.apache.catalina.connector.Request.getParts(Request.java:2539)
at org.apache.catalina.connector.RequestFacade.getParts(RequestFacade.java:1077)
at com.scrappy.web.servlet.compass.verification.MultipartUploadServlet.doPost(MultipartUploadServlet.java:31)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:498)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:394)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)
Caused by: org.apache.tomcat.util.http.fileupload.FileUploadException: Stream ended unexpectedly
at org.apache.tomcat.util.http.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:336)
at org.apache.tomcat.util.http.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:129)
at org.apache.catalina.connector.Request.parseParts(Request.java:2609)
... 22 more
Caused by: org.apache.tomcat.util.http.fileupload.MultipartStream$MalformedStreamException: Stream ended unexpectedly
at org.apache.tomcat.util.http.fileupload.MultipartStream.readHeaders(MultipartStream.java:488)
at org.apache.tomcat.util.http.fileupload.FileUploadBase$FileItemIteratorImpl.findNextItem(FileUploadBase.java:861)
at org.apache.tomcat.util.http.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:827)
at org.apache.tomcat.util.http.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:282)
at org.apache.tomcat.util.http.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:302)
... 24 more
我在标题中看到的唯一真正区别是内容长度。但是我得到的是，如果我从HttpServletRequest获取inputStream并打印出来，它会打印test.txt文件中的所有内容。
我必须遗漏某些东西或者没有强调某些东西，希望有人可以提供帮助！
答案 0 :(得分：6)
Mac / Linux使用\n作为println()上的默认行分隔符，而HTTP强制\r\n（并且是Windows上的默认值）。对不起，这是URLConnection教程中的一个非常愚蠢的错误。我会尽快解决。
答案 1 :(得分：3)
使用wireshark来交换发送的数据包我发现MIME Multipart数据包格式错误。 我基本上改变了客户端来编写内容处理内容以直接使用输出流而不是PrintWriter。它似乎有效，但我不确定为什么，因为两者都是同样重要的。
感谢Vineet Reynolds将我指向WireShark
这是新客户：
package com.scrappy.web.client.compass.verification;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
public class TestClient {
public static void main(String ... aaa) {
System.setProperty("http.keepAlive", "false");
String boundary = "---------------------------" + Long.toHexString(System.currentTimeMillis());
try {
URLConnection connection = new URL("http://localhost:8080/scrappyWeb/MultipartUploadServlet").openConnection();
((HttpURLConnection)connection).setRequestMethod("POST");
((HttpURLConnection)connection).setConnectTimeout(6000000);
connection.setRequestProperty("User-Agent", "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13"); // Do as if you're using Firefox 3.6.3.
connection.setDoOutput(true);
connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
connection.setRequestProperty("accept-encoding", "gzip,deflate");
connection.setRequestProperty("connection", "keep-alive");
connection.setRequestProperty("accept-charset","ISO-8859-1,utf-8;q=0.7,*;q=0.7");
connection.setRequestProperty("accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
connection.setRequestProperty("accept-language", "en-us,en;q=0.5");
OutputStream output = connection.getOutputStream();
String charset = "UTF-8";
File textFile = new File("/Users/christiaan/test.txt");
output.write(("\r\n\r\n--" + boundary +"\r\n").getBytes());
output.write(("Content-Disposition: form-data; name=\"file1\"; filename=\"" + textFile.getName() + "\"\r\n").getBytes());
output.write(("Content-Type: text/plain\r\n").getBytes());
output.write(("\r\n").getBytes());
PrintWriter writer = null;
writer = new PrintWriter(new OutputStreamWriter(output, charset), true);
BufferedReader reader = null;
try {
reader = new BufferedReader(new InputStreamReader(new FileInputStream(textFile), charset));
for (String line; (line = reader.readLine()) != null;) {
writer.println(line);
}
} finally {
if (reader != null) try { reader.close(); } catch (IOException logOrIgnore) {}
}
// End of multipart/form-data.
output.write(("\r\n").getBytes());
output.write(("--" + boundary +"--\r\n").getBytes());
output.flush();
writer.close();
((HttpURLConnection)connection).getResponseCode();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
答案 2 :(得分：1)
有两件事情浮现在脑海中。
编写者处理字符和流处理字节。您需要知道作者正在使用的默认字符集，并且它符合您通过的内容。
对于多部分mime类型，我不确定您要上传的文件内容是否已编码。也许该文件中有些内容不正确。
干杯