struts2实现简单文件上传

最新推荐文章于 2024-06-29 22:48:48 发布

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#struts2 #文件上传

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本文详细介绍了使用JSP页面结合Struts2框架实现文件上传的功能，包括页面展示、Struts2配置、Action处理以及解决上传文件大小限制的方法。

1、jsp页面：

一定要设置enctype为"multipart/form-data"。

2、struts配置：

<package name="fileupload" namespace="/fileupload" extends="struts-default">
  <action name="fileupload" class="cn.itcast.action.FileUploadAction">
   <result name="success">/upload.jsp</result>
  </action>
</package>

记得要继承struts-default

3、action

import java.io.File;

import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;

public class FileUploadAction {
private File file; //与页面中定义的名字一样
private String fileFileName; //表示上传的文件名，格式为XXXFileName
public File getFile() {
  return file;
}
public void setFile(File file) {
  this.file = file;
}
public String getFileFileName() {
  return fileFileName;
}
public void setFileFileName(String fileFileName) {
  this.fileFileName = fileFileName;
}
public String execute() throws Exception{
  String realPath = ServletActionContext.getServletContext().getRealPath("/upload"); //获取觉得路径
  System.out.println(realPath);
  if(file != null){
   File saveFile = new File(realPath, fileFileName);
   if(!saveFile.getParentFile().exists()){
    saveFile.getParentFile().mkdirs(); //创建文件夹
   }
   //用commons-io的jar包
   FileUtils.copyFile(file, saveFile);
   ActionContext.getContext().put("msg", "上传成功");
  }

  return "success";
}
}

4、struts2默认最大只能上传2M的文件，如上传文件超过此限制则会报错：

警告: Request exceeded size limit!
org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (66671724) exceeds the configured maximum (10701096)
at org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:965)
at org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:310)
at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:334)
at org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest.parseRequest(JakartaMultiPartRequest.java:189)
at org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest.processUpload(JakartaMultiPartRequest.java:127)
at org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest.parse(JakartaMultiPartRequest.java:92)
at org.apache.struts2.dispatcher.multipart.MultiPartRequestWrapper.<init>(MultiPartRequestWrapper.java:81)
at org.apache.struts2.dispatcher.Dispatcher.wrapRequest(Dispatcher.java:803)
at org.apache.struts2.dispatcher.ng.PrepareOperations.wrapRequest(PrepareOperations.java:134)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)