Java 使用jetty和servlet上传文件
我正在编写一个java应用程序来从浏览器上传文件。我正在使用jetty 9.4.15和Javaservlet。当我上传文件时,我收到下面的错误消息Java 使用jetty和servlet上传文件,java,file-upload,jetty,embedded-jetty,servlet-3.0,Java,File Upload,Jetty,Embedded Jetty,Servlet 3.0,我正在编写一个java应用程序来从浏览器上传文件。我正在使用jetty 9.4.15和Javaservlet。当我上传文件时,我收到下面的错误消息 java.lang.IllegalStateException: No multipart config for servlet at org.eclipse.jetty.server.Request.getParts(Request.java:2342) at org.eclipse.jetty.server.Request.getParts(Re
java.lang.IllegalStateException: No multipart config for servlet
at org.eclipse.jetty.server.Request.getParts(Request.java:2342)
at org.eclipse.jetty.server.Request.getParts(Request.java:2330)
at org.eclipse.jetty.server.Request.getPart(Request.java:2318)
at com.RekognizeServlet.doPost(RekognizeServlet.java:47)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:754)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:873)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:542)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:205)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:480)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.eclipse.jetty.server.Server.handle(Server.java:502)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:370)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:267)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:132)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)
at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)
at java.lang.Thread.run(Thread.java:745)
下面是我写的代码
SimplestServer.java
RekognizeServlet.java
package-com;
导入java.io.File;
导入java.io.FileNotFoundException;
导入java.io.FileOutputStream;
导入java.io.IOException;
导入java.io.InputStream;
导入java.io.OutputStream;
导入java.io.PrintWriter;
导入java.util.Collection;
导入javax.servlet.ServletException;
导入javax.servlet.annotation.MultipartConfig;
导入javax.servlet.http.HttpServlet;
导入javax.servlet.http.HttpServletRequest;
导入javax.servlet.http.HttpServletResponse;
导入javax.servlet.http.Part;
@多重配置
公共类RekognizeServlet扩展了HttpServlet{
私有静态最终长serialVersionUID=1L;
公共RekognizeServlet(){
超级();
}
受保护的void doGet(HttpServletRequest请求、HttpServletResponse响应)
抛出ServletException、IOException{
response.setContentType(“text/html”);
response.setStatus(HttpServletResponse.SC_OK);
response.getWriter().println(“文件上传文件:
”;
}
受保护的void doPost(HttpServletRequest请求、HttpServletResponse响应)
抛出ServletException、IOException{
setContentType(“text/html;charset=UTF-8”);
//创建路径组件以保存文件
最终字符串路径=“/path/”;
最终部分filePart=request.getPart(“文件”);
最终集合fileParts=request.getParts();
最终字符串文件名=getFileName(filePart);
OutputStream out=null;
InputStream filecontent=null;
最终PrintWriter=response.getWriter();
试一试{
out=newfileoutputstream(新文件(path+File.separator+fileName));
filecontent=filePart.getInputStream();
int read=0;
最终字节[]字节=新字节[1024];
而((read=filecontent.read(bytes))!=-1){
输出。写入(字节,0,读取);
}
println(“上传到{1}的文件”);
}捕获(FileNotFoundException fne){
println(“您没有指定要上载的文件,或者”
+“正在尝试将文件上载到受保护或不存在的“+”位置。”);
writer.println(“
错误:+fne.getMessage());
System.out.println(“文件上传期间的问题”);
fne.printStackTrace();
}最后{
if(out!=null){
out.close();
}
if(filecontent!=null){
filecontent.close();
}
if(writer!=null){
writer.close();
}
}
}
私有字符串getFileName(最后一部分){
最终字符串partHeader=part.getHeader(“内容处置”);
System.out.println(“零件头=“+partHeader”);
对于(字符串内容:part.getHeader(“内容处置”).split(;”){
if(content.trim().startsWith(“文件名”)){
返回content.substring(content.indexOf('=')+1.trim().replace(“\”,”);
}
}
返回null;
}
}
我没有像网上很多例子那样使用Handler。有人能帮忙吗
下面是我看到的链接(不是全部)
由于您使用的是嵌入式Jetty,因此默认情况下不会启用注释的字节码扫描(例如
@MultipartConfig
)
启用字节码扫描需要很多努力,实际上只需在代码中指定注释的实际用途就更容易了
因此,在您的情况下,您只需要更改servlet的初始化
例如:
Server服务器=新服务器(8080);
ServletContextHandler上下文=新的ServletContextHandler();
context.setContextPath(“/”);
ServletHolder uploadHolder=context.addServlet(RekognizeServlet.class,
“/tryAndRecognize”);
File tmpDir=新文件(System.getProperty(“java.io.tmpDir”);
File locationDir=新文件(tmpDir,“jetty文件上传”);
如果(!locationDir.exists())locationDir.mkdirs();
字符串位置=locationDir.getAbsolutePath();
长maxFileSize=1024*1024*50;
长maxRequestSize=-1L;
int fileSizeThreshold=1024*1024;
MultipartConfigElement multipartConfig=新的MultipartConfigElement(位置,
maxFileSize、maxRequestSize、fileSizeThreshold);
uploadHolder.getRegistration().setMultipartConfig(multipartConfig);
setHandler(上下文);
server.start();
需要注意的是,MultipartConfig需要位于指定的位置(最低限度)。
此外,如果没有ServletContextHandler
提供的ServletContextHandler,MultipartConfig将无法工作
package com;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.servlet.ServletHandler;
public class SimplestServer
{
public static void main(String[] args) throws Exception
{
Server server = new Server(8080);
ServletHandler handler = new ServletHandler();
server.setHandler(handler);
handler.addServletWithMapping(RekognizeServlet.class, "/tryAndRecognize");
server.start();
server.join();
}
}
package com;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Collection;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
@MultipartConfig
public class RekognizeServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public RekognizeServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
response.setStatus(HttpServletResponse.SC_OK);
response.getWriter().println("<!DOCTYPE html><html lang=\"en\"><head><title>File Upload</title><meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\"></head><body><form method=\"POST\" action=\"tryAndRecognize\" enctype=\"multipart/form-data\" >File:<input type=\"file\" name=\"file\" id=\"file\" /> <br/></br><input type=\"submit\" value=\"Upload\" name=\"upload\" id=\"upload\" /></form></body></html>");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
// Create path components to save the file
final String path = "/path/";
final Part filePart = request.getPart("file");
final Collection<Part> fileParts = request.getParts();
final String fileName = getFileName(filePart);
OutputStream out = null;
InputStream filecontent = null;
final PrintWriter writer = response.getWriter();
try {
out = new FileOutputStream(new File(path + File.separator + fileName));
filecontent = filePart.getInputStream();
int read = 0;
final byte[] bytes = new byte[1024];
while ((read = filecontent.read(bytes)) != -1) {
out.write(bytes, 0, read);
}
System.out.println("File being uploaded to {1}");
} catch (FileNotFoundException fne) {
writer.println("You either did not specify a file to upload or are "
+ "trying to upload a file to a protected or nonexistent " + "location.");
writer.println("<br/> ERROR: " + fne.getMessage());
System.out.println("Problems during file upload");
fne.printStackTrace();
} finally {
if (out != null) {
out.close();
}
if (filecontent != null) {
filecontent.close();
}
if (writer != null) {
writer.close();
}
}
}
private String getFileName(final Part part) {
final String partHeader = part.getHeader("content-disposition");
System.out.println("Part Header = " + partHeader);
for (String content : part.getHeader("content-disposition").split(";")) {
if (content.trim().startsWith("filename")) {
return content.substring(content.indexOf('=') + 1).trim().replace("\"", "");
}
}
return null;
}
}