Struts2的单文件上传与多文件上传.
首先这个是html页面内容:

单文件上传:<br/>  <form action="fileUpload" method="post" enctype="multipart/form-data">      username:<input type="text" name="username"/><br/>       <input type="file" name="file"/><br/>       <input type="submit"/>     </form>         多文件上传:<br/>      <form action="mulFileUpload" method="post" enctype="multipart/form-data">       <input type="file" name="files"/><br/>       <input type="file" name="files"/><br/>       <input type="file" name="files"/><br/>       <input type="submit"/>     </form>

然后是struts action文件代码:

package com.action;    import java.io.File;  import java.io.FileInputStream;  import java.io.FileNotFoundException;  import java.io.FileOutputStream;  import java.io.IOException;  import java.io.InputStream;  import java.io.OutputStream;  import java.util.List;    import org.apache.struts2.ServletActionContext;    import com.opensymphony.xwork2.ActionSupport;    public class UploadAction  extends ActionSupport{   private static final long serialVersionUID = 1L;   private String username;   private File file;   private String fileFileName; //名字固定的 file与file相同 FileName固定   private String fileContentType; //名字固定的 file与file线条 ContentType固定   public String getUsername() {    return username;   }   public void setUsername(String username) {    this.username = username;   }   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 getFileContentType() {    return fileContentType;   }   public void setFileContentType(String fileContentType) {    this.fileContentType = fileContentType;   }      public String fileUpload() throws Exception {    //设置上传路径-----------真实的文件路径.如:c://tomcat//webapps//upload    String //root=ServletActionContext.getRequest().getRealPath("/upload"); //该方法在2.1之前使用          root=ServletActionContext.getServletContext().getRealPath("/upload");        //输入    InputStream is=new FileInputStream(file);        //设置文件存放的路径与名字    File destFile=new File(root, fileFileName);        //程序先会将文件放置到临时目录，然后从临时目录转移到指定目录    //如果临时目录不存在将使用环境变量所指定的目录,如:...tomcat/work ....下面    //通过struts.properties -->struts.multipart.saveDir  可以设置临时目录    //如:struts.multipart.saveDir=d:/temp            //输出文件    OutputStream os=new FileOutputStream(destFile);    //每次传输的字节    byte[] buffer=new byte[400];    //按字节读取文件的长度    int length=0;    //如果没有读取到内容将返回-1    while((length=is.read(buffer))!=-1){     os.write(buffer,0,length);    }    //关闭    is.close();        return SUCCESS;        //如果出错了将返回INPUT   }                 public List<File> getFiles() {    return files;   }   public void setFiles(List<File> files) {    this.files = files;   }   public List<String> getFilesFileName() {    return filesFileName;   }   public void setFilesFileName(List<String> filesFileName) {    this.filesFileName = filesFileName;   }   public List<String> getFilesContentType() {    return filesContentType;   }   public void setFilesContentType(List<String> filesContentType) {    this.filesContentType = filesContentType;   }     //前面为get/set方法   private List<File> files; //也可用File[] files   private List<String> filesFileName;   private List<String> filesContentType;   /*    * 多文件上传    */   public String mulFileUpload(){        for (int i = 0; i < files.size(); i++) {     InputStream is=null;     try {      is=new FileInputStream(files.get(i));      String root=ServletActionContext.getServletContext().getRealPath("/upload");      File destFile=new File(root,filesFileName.get(i));      OutputStream os=new FileOutputStream(destFile);      byte[] buffer=new byte[400];      int length=0;      while((length=is.read(buffer))!=-1){       os.write(buffer,0,length);      }      is.close();     } catch (FileNotFoundException e) {      e.printStackTrace();     } catch (IOException e) {      e.printStackTrace();     }    }        return SUCCESS;   }  }

然后是struts.xml 配置内容:

<!-- 单文件上传 -->    <action name="fileUpload" class="com.action.UploadAction" method="fileUpload">     <result name="success">fileuploadresult.jsp</result>     <result name="input">fileuploaderror.jsp</result>    </action>        <!-- 多文件上传 -->    <action name="mulFileUpload" class="com.action.UploadAction" method="mulFileUpload">     <result name="success">fileuploadresult.jsp</result>     <result name="input">fileuploaderror.jsp</result>    </action>

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