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我试图让我的页面允许用户将文件上传到他们的计算机上。连接index.html和HelloServlet.java是我正在努力。我Tomcat工作正常，因为我得到errors在Terminal这很好，因为它显示它连接到我的项目。为什么我的本地主机中的tomcat不能在Eclipse中正确运行？
我只是不明白这是如何工作。当我点击运行时，我希望index.html页面出现在Eclipse标签之一中，允许我将文件上传到我的电脑。我怎样才能解决这个问题？
每次我在Eclipse打run我得到这些errors在Terminal（pic of error in Eclipse)：
08-Oct-2017 16:00:01.872 INFO [main] org.apache.catalina.startup.Catalina.load Initialization processed in 999 ms
08-Oct-2017 16:00:01.979 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service [Catalina]
08-Oct-2017 16:00:01.980 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.5.23
08-Oct-2017 16:00:01.993 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/Applications/tomcat/webapps/docs]
08-Oct-2017 16:00:02.609 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/Applications/tomcat/webapps/docs] has finished in [615] ms
08-Oct-2017 16:00:02.610 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/Applications/tomcat/webapps/examples]
08-Oct-2017 16:00:03.130 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/Applications/tomcat/webapps/examples] has finished in [520] ms
08-Oct-2017 16:00:03.131 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/Applications/tomcat/webapps/hello]
08-Oct-2017 16:00:03.189 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/Applications/tomcat/webapps/hello] has finished in [58] ms
08-Oct-2017 16:00:03.189 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/Applications/tomcat/webapps/host-manager]
08-Oct-2017 16:00:03.232 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/Applications/tomcat/webapps/host-manager] has finished in [43] ms
08-Oct-2017 16:00:03.233 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/Applications/tomcat/webapps/manager]
08-Oct-2017 16:00:03.271 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/Applications/tomcat/webapps/manager] has finished in [38] ms
08-Oct-2017 16:00:03.272 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/Applications/tomcat/webapps/ROOT]
08-Oct-2017 16:00:03.318 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [/Applications/tomcat/webapps/ROOT] has finished in [45] ms
08-Oct-2017 16:00:03.322 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-nio-8080"]
08-Oct-2017 16:00:03.330 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 1457 ms
09-Oct-2017 07:40:36.569 WARNING [main] org.apache.catalina.core.StandardServer.await StandardServer.await: Invalid command 'GET /FileUploadServlet/index.html HTTP/1.1' received
09-Oct-2017 07:40:36.674 WARNING [main] org.apache.catalina.core.StandardServer.await StandardServer.await: Invalid command 'GET /FileUploadServlet/index.html HTTP/1.1' received
09-Oct-2017 07:40:36.779 WARNING [main] org.apache.catalina.core.StandardServer.await StandardServer.await: Invalid command 'GET /FileUploadServlet/index.html HTTP/1.1' received
09-Oct-2017 07:40:57.556 WARNING [main] org.apache.catalina.core.StandardServer.await StandardServer.await: Invalid command 'GET /FileUploadServlet/index.html HTTP/1.1' received
这里的index.html：
<html>
<head></head>
<body>
<form action="FileUploadServlet" method="post" enctype="multipart/form-data">
Select File to Upload:<input type="file" name="fileName">
<br>
<input type="submit" value="Upload">
</form>
</body>
</html>
这里是FileUploadServlet.java：
package net.techsuite.SIPPA_HealthTech;
//package com.journaldev.servlet;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
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("/FileUploadServlet")
@MultipartConfig(fileSizeThreshold=1024*1024*10, // 10 MB
maxFileSize=1024*1024*50, // 50 MB
maxRequestSize=1024*1024*100) // 100 MB
public class FileUploadServlet extends HttpServlet {
private static final long serialVersionUID = 205242440643911308L;
/**
* Directory where uploaded files will be saved, its relative to
* the web application directory.
*/
private static final String UPLOAD_DIR = "uploads";
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// gets absolute path of the web application
String applicationPath = request.getServletContext().getRealPath("");
// constructs path of the directory to save uploaded file
String uploadFilePath = applicationPath + File.separator + UPLOAD_DIR;
// creates the save directory if it does not exists
File fileSaveDir = new File(uploadFilePath);
if (!fileSaveDir.exists()) {
fileSaveDir.mkdirs();
}
System.out.println("Upload File Directory="+fileSaveDir.getAbsolutePath());
String fileName = "";
//Get all the parts from request and write it to the file on server
for (Part part : request.getParts()) {
fileName = getFileName(part);
File file = new File(fileName);
part.write(uploadFilePath + File.separator + file.getName());
}
writeToResponse(response, "File uploaded successfully to: " + uploadFilePath);
request.setAttribute("message", "File uploaded successfully!");
getServletContext().getRequestDispatcher("/response.jsp").forward(
request, response);
}
/**
* Utility method to get file name from HTTP header content-disposition
*/
private String getFileName(Part part) {
String contentDisp = part.getHeader("content-disposition");
System.out.println("content-disposition header= "+contentDisp);
String[] tokens = contentDisp.split(";");
for (String token : tokens) {
if (token.trim().startsWith("filename")) {
return token.substring(token.indexOf("=") + 2, token.length()-1);
}
}
return "";
}
private void writeToResponse(HttpServletResponse resp, String results) throws IOException {
PrintWriter writer = new PrintWriter(resp.getOutputStream());
resp.setContentType("text/plain");
if (results.isEmpty()) {
writer.write("No results found.");
} else {
writer.write(results);
}
writer.close();
}
}
这里的web.xml文件夹WebContent：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>FileUploadServlet</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>
这里的server.xml文件：
<?xml version="1.0" encoding="UTF-8"?>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
--><!-- Note: A "Server" is not itself a "Container", so you may not
define subcomponents such as "Valves" at this level.
Documentation at /docs/config/server.html
--><Server port="8005" shutdown="SHUTDOWN">
<Listener className="org.apache.catalina.startup.VersionLoggerListener"/>
<!-- Security listener. Documentation at /docs/config/listeners.html
<Listener className="org.apache.catalina.security.SecurityListener" />
-->
<!--APR library loader. Documentation at /docs/apr.html -->
<Listener SSLEngine="on" className="org.apache.catalina.core.AprLifecycleListener"/>
<!-- Prevent memory leaks due to use of particular java/javax APIs-->
<Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener"/>
<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"/>
<Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener"/>
<!-- Global JNDI resources
Documentation at /docs/jndi-resources-howto.html
-->
<GlobalNamingResources>
<!-- Editable user database that can also be used by
UserDatabaseRealm to authenticate users
-->
<Resource auth="Container" description="User database that can be updated and saved" factory="org.apache.catalina.users.MemoryUserDatabaseFactory" name="UserDatabase" pathname="conf/tomcat-users.xml" type="org.apache.catalina.UserDatabase"/>
</GlobalNamingResources>
<!-- A "Service" is a collection of one or more "Connectors" that share
a single "Container" Note: A "Service" is not itself a "Container",
so you may not define subcomponents such as "Valves" at this level.
Documentation at /docs/config/service.html
-->
<Service name="Catalina">
<!--The connectors can use a shared executor, you can define one or more named thread pools-->
<!--
<Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
maxThreads="150" minSpareThreads="4"/>
-->
<!-- A "Connector" represents an endpoint by which requests are received
and responses are returned. Documentation at :
Java HTTP Connector: /docs/config/http.html
Java AJP Connector: /docs/config/ajp.html
APR (HTTP/AJP) Connector: /docs/apr.html
Define a non-SSL/TLS HTTP/1.1 Connector on port 8080
-->
<Connector connectionTimeout="20000" port="8005" protocol="HTTP/1.1" redirectPort="8443"/>
<!-- A "Connector" using the shared thread pool-->
<!--
<Connector executor="tomcatThreadPool"
port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
-->
<!-- Define a SSL/TLS HTTP/1.1 Connector on port 8443
This connector uses the NIO implementation. The default
SSLImplementation will depend on the presence of the APR/native
library and the useOpenSSL attribute of the
AprLifecycleListener.
Either JSSE or OpenSSL style configuration may be used regardless of
the SSLImplementation selected. JSSE style configuration is used below.
-->
<!--
<Connector port="8443" protocol="org.apache.coyote.http11.Http11NioProtocol"
maxThreads="150" SSLEnabled="true">
<SSLHostConfig>
<Certificate certificateKeystoreFile="conf/localhost-rsa.jks"
type="RSA" />
</SSLHostConfig>
</Connector>
-->
<!-- Define a SSL/TLS HTTP/1.1 Connector on port 8443 with HTTP/2
This connector uses the APR/native implementation which always uses
OpenSSL for TLS.
Either JSSE or OpenSSL style configuration may be used. OpenSSL style
configuration is used below.
-->
<!--
<Connector port="8443" protocol="org.apache.coyote.http11.Http11AprProtocol"
maxThreads="150" SSLEnabled="true" >
<UpgradeProtocol className="org.apache.coyote.http2.Http2Protocol" />
<SSLHostConfig>
<Certificate certificateKeyFile="conf/localhost-rsa-key.pem"
certificateFile="conf/localhost-rsa-cert.pem"
certificateChainFile="conf/localhost-rsa-chain.pem"
type="RSA" />
</SSLHostConfig>
</Connector>
-->
<!-- Define an AJP 1.3 Connector on port 8009 -->
<Connector port="8008" protocol="AJP/1.3" redirectPort="8443"/>
<!-- An Engine represents the entry point (within Catalina) that processes
every request. The Engine implementation for Tomcat stand alone
analyzes the HTTP headers included with the request, and passes them
on to the appropriate Host (virtual host).
Documentation at /docs/config/engine.html -->
<!-- You should set jvmRoute to support load-balancing via AJP ie :
<Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1">
-->
<Engine defaultHost="localhost" name="Catalina">
<!--For clustering, please take a look at documentation at:
/docs/cluster-howto.html (simple how to)
/docs/config/cluster.html (reference documentation) -->
<!--
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
-->
<!-- Use the LockOutRealm to prevent attempts to guess user passwords
via a brute-force attack -->
<Realm className="org.apache.catalina.realm.LockOutRealm">
<!-- This Realm uses the UserDatabase configured in the global JNDI
resources under the key "UserDatabase". Any edits
that are performed against this UserDatabase are immediately
available for use by the Realm. -->
<Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/>
</Realm>
<Host appBase="webapps" autoDeploy="true" name="localhost" unpackWARs="true">
<!-- SingleSignOn valve, share authentication between web applications
Documentation at: /docs/config/valve.html -->
<!--
<Valve className="org.apache.catalina.authenticator.SingleSignOn" />
-->
<!-- Access log processes all example.
Documentation at: /docs/config/valve.html
Note: The pattern used is equivalent to using pattern="common" -->
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" pattern="%h %l %u %t "%r" %s %b" prefix="localhost_access_log" suffix=".txt"/>
<Context docBase="FileUploadServlet" path="/FileUploadServlet" reloadable="true" source="org.eclipse.jst.jee.server:FileUploadServlet"/></Host>
</Engine>
</Service>
</Server>
您是否正确地完成了部署描述符中的映射？ –
@robot_alien不知道，我该怎么做？ （nice name btw） – obsolutemal
'@WebServlet（“/ FileUploadServlet”）。/我们还需要映射@robot_alien – Optional