Struts2学习手册之文件上传基础教程

### Parser to handle HTTP POST requests, encoded using the MIME-type multipart/form-data
# struts.multipart.parser=cos
# struts.multipart.parser=pell
# struts.multipart.parser=jakarta-stream
struts.multipart.parser=jakarta
# uses javax.servlet.context.tempdir by default
struts.multipart.saveDir=
struts.multipart.maxSize=2097152

<form action="upload" method="post" enctype="multipart/form-data">
 Title:<input type="text" name="title"><br>
 File:<input type="file" name="upload"><br>
 <input type="submit" value="submit">
</form>

public class UploadAction extends ActionSupport
{
 private String title;
 private File upload;
 private String uploadContentType;
 private String uploadFileName;
 private String savePath;

 public void setSavePath(String value)
 {
  this.savePath = value;
 }

 private String getSavePath()
 {
  String realPath = ServletActionContext.getServletContext().getRealPath("/WEB-INF/" + savePath);
  return realPath;
 }

 public void setTitle(String value)
 {
  this.title = value;
 }

 public String getTitle()
 {
  return title;
 }

 public void setUpload(File value)
 {
  this.upload = value;
 }

 public File getUpload()
 {
  return upload;
 }

 public void setUploadContentType(String value)
 {
  this.uploadContentType = value;
 }

 public String getFileContentType()
 {
  return uploadContentType;
 }

 public void setUploadFileName(String value)
 {
  this.uploadFileName = value;
 }

 public String getUploadFileName()
 {
  return uploadFileName;
 }

 @Override
 public String execute() throws Exception
 {
  FileOutputStream fos = new FileOutputStream(getSavePath() + "\\" + getUploadFileName());
  FileInputStream fis = new FileInputStream(getUpload());
  byte[] buffer = new byte[1024];
  int len = 0;
  while ((len = fis.read(buffer)) > 0)
  {
   fos.write(buffer, 0, len);
  }
  fis.close();
  fos.close();
  return SUCCESS;
 }
}

<package name="upload" extends="struts-default">
 <action name="upload" class="com.jellythink.practise.UploadAction">
  <param name="savePath">/upload</param>
  <result name="success">/success.jsp</result>
  <result name="input">/index.jsp</result>
 </action>
</package>

<param name="allowTypes">image/png,image/gif,image/jpeg</param>

// 进行验证
@Override
public void validate()
{
 String filterResult = filterType(getAllowTypes().split(","));
 if (filterResult != null)
 {
  addFieldError("upload", "您要上传的文件类型不正确！");
 }
}

public String filterType(String[] types)
{
 String fileType = getFileContentType();
 for (String type : types)
 {
  if (type.equals(fileType))
  {
   return null;
  }
 }
 return ERROR;
}

<!-- 配置fileUpload拦截器 -->
<interceptor-ref name="fileUpload">
 <param name="allowedTypes">image/png,image/gif,image/jpeg</param>
 <param name="maximumSize">20000000</param>
</interceptor-ref>

<!-- 配置系统默认的拦截器 -->
<interceptor-ref name="defaultStack" />
<result name="success">/success.jsp</result>
<result name="input">/index.jsp</result>