当我尝试使用eclipse中的Struts上传和保存图像文件时，会将文件名显示为null [英] When I try to upload and save an image file using Struts in eclipse it shows the file name as null
本文介绍了当我尝试使用eclipse中的Struts上传和保存图像文件时，会将文件名显示为null的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
这是我的索引页：
<％@ page language =java contentType =text / html; charset = ISO-8859-1
pageEncoding =ISO-8859-1％>
<％@ taglib prefix =suri =/ struts-tags％>
< html>
< head>
< meta http-equiv =SContent-Typecontent =text / html; charset = ISO-8859-1>
< title>在此插入标题< / title>
< / head>
< body>
< s：form action =clickuploadmethod =postenctype =multipart / form-data>
< s：file name =myFile>< / s：file>
< s：submit value =上传/>
< / s：form>
< / body>
< / html>
struts.xml
<？xml version =1.0encoding =UTF-8？>
<！DOCTYPE struts PUBLIC
- // Apache Software Foundation // DTD Struts配置2.3 // EN
http://struts.apache.org/dtds/struts- 2.3.dtd>
< struts>
< include file =struts-default.xml/>
< constant name =struts.enable.DynamicMethodInvocationvalue =false/>
< constant name =struts.devModevalue =true/>
< package name =uploadSnewnamespace =/extends =struts-default>
< action name =clickuploadclass =tryupload.UploadNewFilemethod =execute>
< interceptor-ref name =basicStack/>
< interceptor-ref name =fileUpload>
< param name =maximumSize> 2048000< / param>
< param name =allowedTypes> image / jpeg，image / gif< / param>
< / interceptor-ref>
< result name =success> /success.jsp< / result>
< result name =error> /error.jsp< / result>
< result name =input> /index.jsp< / result>
< / action>
< / package>
< / struts>
当我上传文件并提交时显示：
$ b $
消息：
文件：java / io / File.java
行号：291
------------------------------ --------------------------------------------------
堆栈跟踪
java.lang.NullPointerException
java.io.File。< init>（File.java:291）
tryupload.UploadNewFile.execute（UploadNewFile.java:32）
（本地方法）
b java.lang.reflect.Method.invoke（Method.java:606）
ognl.OgnlRuntime.invokeMethod（OgnlRuntime.ja va：870）
ognl.OgnlRuntime.callAppropriateMethod（OgnlRuntime.java:1293）
ognl.ObjectMethodAccessor.callMethod（ObjectMethodAccessor.java:68）
com.opensymphony.xwork2.ognl.accessor。 XWorkMethodAccessor.callMethodWithDebugInfo（XWorkMethodAccessor.java:117）
com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod（XWorkMethodAccessor.java:108）
ognl.OgnlRuntime.callMethod（OgnlRuntime.java:1369）
ognl.ASTMethod.getValueBody（ASTMethod.java:90）
ognl.SimpleNode.evaluateGetValueBody（SimpleNode.java:212）
ognl.SimpleNode.getValue（SimpleNode.java:258）
ognl.Ognl.getValue（Ognl.java:494）
ognl.Ognl.getValue（Ognl.java:458）
com.opensymphony.xwork2.ognl.OgnlUtil $ 2.execute（OgnlUtil.java ：309）
com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecute（OgnlUtil.java:340）
com.opensymphony.xwork2.ognl.OgnlUtil.getValue（OgnlUtil.ja va：307）
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction（DefaultActionInvocation.java:423）
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly（DefaultActionInvocation.java:287）
com。 opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:250）
org.apache.struts2.interceptor.FileUploadInterceptor.intercept（FileUploadInterceptor.java:326）
com.opensymphony.xwork2.DefaultActionInvocation.invoke（ DefaultActionInvocation.java:244）
org.apache.struts2.interceptor.DeprecationInterceptor.intercept（DeprecationInterceptor.java:41）
com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:244）
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept（ConversionErrorInterceptor.java:138）
com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:244）
c om.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept（ParametersInterceptor.java:229）
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept（MethodFilterInterceptor.java:98）
com.opensymphony.xwork2。 DefaultActionInvocation.invoke（DefaultActionInvocation.java:244）
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept（ParametersInterceptor.java:229）
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept（MethodFilterInterceptor。 java：98）
com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:244）
org.apache.struts2.interceptor.MultiselectInterceptor.intercept（MultiselectInterceptor.java:73）
com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:244）
org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept（DateTextFieldInterceptor.java:125）
c om.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:244）
org.apache.struts2.interceptor.CheckboxInterceptor.intercept（CheckboxInterceptor.java:91）
com.opensymphony.xwork2.DefaultActionInvocation。 invoke（DefaultActionInvocation.java:244）
com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept（PrepareInterceptor.java:171）
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept（MethodFilterInterceptor.java： 98）
com.opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:244）
org.apache.struts2.interceptor.ServletConfigInterceptor.intercept（ServletConfigInterceptor.java:164）
com。 opensymphony.xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:244）
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept（ExceptionMappingInterceptor.java:189）
com.opensymphony。 xwork2.DefaultActionInvocation.invoke（DefaultActionInvocation.java:244）
org.apache.struts2.impl.StrutsActionProxy.execute（StrutsActionProxy.java:54）
org.apache.struts2.dispatcher.Dispatcher.serviceAction（ Dispatcher.java:564）
org.apache.struts2.dispatcher.FilterDispatcher.doFilter（FilterDispatcher.java:434）
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:239）
org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）
org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:219）
org。 apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:106）
org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:502）
org.apache.catalina.core。 StandardHostValve.invoke（StandardHostValve.java:142）
org.apache.catalina.valves.Erro rReportValve.invoke（ErrorReportValve.java:79）
org.apache.catalina.valves.AbstractAccessLogValve.invoke（AbstractAccessLogValve.java:617）
org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve。 java：88）
org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:518）
org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:1091）
org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:668）
org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.doRun（NioEndpoint.java:1527）
org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.run（NioEndpoint.java:1484）
java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1145）
java.util。 concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:615）
org.apache.tomcat.util.threads.TaskThread $ WrappingRun nable.run（TaskThread.java:61）
java.lang.Thread.run（Thread.java:724）
你是看到此页面，因为开发模式已启用。开发模式或devMode支持额外的调试行为和报告来协助开发人员。要禁用此模式，请在您的WEB-INF / classes / struts.properties文件中设置：
struts.devMode = false
。
我的控制台：
2015年9月30日10:16:29 PM org.apache.struts2.interceptor.FileUploadInterceptor警告
警告：内容类型不允许：myFileFiveFingerDeathPunch image_
文件名：null
UploadNewFile - 我的动作类：
package tryupload;
import java.io.File;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.io.FileUtils;
import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.interceptor.ServletRequestAware;
public class UploadNewFile extends ActionSupport implements ServletRequestAware {
/ **
*
* /
private static final long serialVersionUID = 1L;
private HttpServletRequest servletRequest;
私人文件myFile;
private String myFileContentType;
private String myFileFileName;
public File getMyFile（）{
return myFile;
}
public void setMyFile（File myFile）{
this.myFile = myFile;
}
public String getMyFileFileName（）{
return myFileFileName;
}
public void setMyFileFileName（String myFileFileName）{
this.myFileFileName = myFileFileName;
}
public String getMyFileContentType（）{
return myFileContentType;
}
public void setMyFileContentType（String myFileContentType）{
this.myFileContentType = myFileContentType;
}
public String execute（）throws异常{
/ * File saveFilePath = new File（WebContent / images+ myFileFileName）;
System.out.println（Filename：+ myFileFileName）;
* /
try {
String filePath = servletRequest.getSession（）。getServletContext（）。getRealPath（/）;
System.out.println（Server path：+ filePath）;
System.out.println（Filename：+ myFileFileName）;
文件fileToCreate = new File（filePath，this.myFileFileName）;
FileUtils.copyFile（this.myFile，fileToCreate）;
}
catch（IOException ex）{
System.out.println（无法保存文件：+ ex.getMessage（））;
ex.getStackTrace（）;
addActionError（ex.getMessage（））;
return ERROR;
}
return SUCCESS;
}
@Override
public void setServletRequest（HttpServletRequest servletRequest）{
// TODO自动生成的方法存根
this.servletRequest = servletRequest;
}
}
解决方案
为了正确处理多部分请求，FileUpload拦截器必须在其他拦截器之前运行以阻止其他拦截器。然后从
< interceptor-ref name =basicStack/>
< interceptor-ref name =fileUpload>
< param name =maximumSize> 2048000< / param>
< param name =allowedTypes> image / jpeg，image / gif< / param>
< / interceptor-ref>
到
< interceptor-ref name =fileUpload>
< param name =maximumSize> 2048000< / param>
< param name =allowedTypes> image / jpeg，image / gif< / param>
< / interceptor-ref>
< interceptor-ref name =basicStack/>
足以让它工作。 阅读更多。
This is my index page:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<meta http-equiv="SContent-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<s:form action="clickupload" method="post" enctype="multipart/form-data" >
<s:file name="myFile"></s:file>
<s:submit value="Upload"/>
</s:form>
</body>
</html>
struts.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<include file="struts-default.xml"/>
<constant name="struts.enable.DynamicMethodInvocation" value="false" />
<constant name="struts.devMode" value="true" />
<package name="uploadSnew" namespace="/" extends="struts-default">
<action name="clickupload" class="tryupload.UploadNewFile" method="execute">
<interceptor-ref name="basicStack"/>
<interceptor-ref name="fileUpload">
<param name="maximumSize">2048000</param>
<param name="allowedTypes">image/jpeg,image/gif</param >
</interceptor-ref>
<result name="success" >/success.jsp</result>
<result name="error">/error.jsp</result>
<result name="input">/index.jsp</result>
</action>
</package>
</struts>
When I upload a file and submit it shows:
Struts Problem Report
Struts has detected an unhandled exception:
Messages:
File: java/io/File.java
Line number: 291
--------------------------------------------------------------------------------
Stacktraces
java.lang.NullPointerException
java.io.File.<init>(File.java:291)
tryupload.UploadNewFile.execute(UploadNewFile.java:32)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:606)
ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:870)
ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1293)
ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)
com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)
com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)
ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1369)
ognl.ASTMethod.getValueBody(ASTMethod.java:90)
ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
ognl.SimpleNode.getValue(SimpleNode.java:258)
ognl.Ognl.getValue(Ognl.java:494)
ognl.Ognl.getValue(Ognl.java:458)
com.opensymphony.xwork2.ognl.OgnlUtil$2.execute(OgnlUtil.java:309)
com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecute(OgnlUtil.java:340)
com.opensymphony.xwork2.ognl.OgnlUtil.getValue(OgnlUtil.java:307)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:423)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:287)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:250)
org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:326)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
org.apache.struts2.interceptor.DeprecationInterceptor.intercept(DeprecationInterceptor.java:41)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:125)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:564)
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:434)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:617)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1527)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1484)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
java.lang.Thread.run(Thread.java:724)
You are seeing this page because development mode is enabled. Development mode, or devMode, enables extra debugging behaviors and reports to assist developers. To disable this mode, set:
struts.devMode=false
in your WEB-INF/classes/struts.properties file.
My console:
Sep 30, 2015 10:16:29 PM org.apache.struts2.interceptor.FileUploadInterceptor warn
WARNING: Content-Type not allowed: myFile "FiveFingerDeathPunch.jpg" "upload_1a24317f_cf06_45b2_be8d_1b56d56eab1e_00000000.tmp" image/pjpeg
Server path:E:\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\tryupload\
Filename:null
UploadNewFile - My action class:
package tryupload;
import java.io.File;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.io.FileUtils;
import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.interceptor.ServletRequestAware;
public class UploadNewFile extends ActionSupport implements ServletRequestAware {
/**
*
*/
private static final long serialVersionUID = 1L;
private HttpServletRequest servletRequest;
private File myFile;
private String myFileContentType;
private String myFileFileName;
public File getMyFile() {
return myFile;
}
public void setMyFile(File myFile) {
this.myFile = myFile;
}
public String getMyFileFileName() {
return myFileFileName;
}
public void setMyFileFileName(String myFileFileName) {
this.myFileFileName = myFileFileName;
}
public String getMyFileContentType() {
return myFileContentType;
}
public void setMyFileContentType(String myFileContentType) {
this.myFileContentType = myFileContentType;
}
public String execute() throws Exception {
/*File saveFilePath = new File("WebContent/images" +myFileFileName);
System.out.println("Filename:"+myFileFileName);
*/
try {
String filePath = servletRequest.getSession().getServletContext().getRealPath("/");
System.out.println("Server path:" + filePath);
System.out.println("Filename:"+myFileFileName);
File fileToCreate = new File(filePath, this.myFileFileName);
FileUtils.copyFile(this.myFile, fileToCreate);
}
catch (IOException ex) {
System.out.println("Couldn't save file: " + ex.getMessage());
ex.getStackTrace();
addActionError(ex.getMessage());
return ERROR;
}
return SUCCESS;
}
@Override
public void setServletRequest(HttpServletRequest servletRequest) {
// TODO Auto-generated method stub
this.servletRequest = servletRequest;
}
}
解决方案
To handle the multipart request correctly, the FileUpload Interceptor must run before other interceptors that otherwise would mess things up. Then changing the order from
<interceptor-ref name="basicStack"/>
<interceptor-ref name="fileUpload">
<param name="maximumSize">2048000</param>
<param name="allowedTypes">image/jpeg,image/gif</param >
</interceptor-ref>
to
<interceptor-ref name="fileUpload">
<param name="maximumSize">2048000</param>
<param name="allowedTypes">image/jpeg,image/gif</param >
</interceptor-ref>
<interceptor-ref name="basicStack"/>
is enough to make it work. Read more.
这篇关于当我尝试使用eclipse中的Struts上传和保存图像文件时，会将文件名显示为null的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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