在做文件上传时，不加限制上传任意类型文件都成功，但是如果加了“allowedTypes”限制文件类型后，上传正确类型成功，上传错误类型失败，这些都是理所当然的结果。问题是上传错误类型失败后，再上传正确的文件，也跳转到input视图，不经过action。如限制只能上传gif格式文件，第一次上传gif图片返回success；第二次上传非gif文件，返回input；第三次上传gif文件，还是返回input，怎么解决？
代码如下：
jsp页面：

action：
package ss2h.Action;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Date;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class FileUploadAction extends ActionSupport {
private static final long serialVersionUID = 572146812454l ;
private static final int BUFFER_SIZE = 16 * 1024 ;

private File myFile;
private String contentType;
private String fileName;
private String imageFileName;
private String caption;

public void setMyFileContentType(String contentType) {
    this .contentType = contentType;

}

public void setMyFileFileName(String fileName) {
    this .fileName = fileName;

}

public void setMyFile(File myFile) {
    this .myFile = myFile;

}

public String getImageFileName() {
    return imageFileName;

}

public String getCaption() {
    return caption;

}

public void setCaption(String caption) {
    this .caption = caption;

}

private static void copy(File src, File dst) {
    try {
       InputStream in = null ;
       OutputStream out = null ;
        try {  

            if (dst.getParentFile() != null
                    && dst.getParentFile().exists() == false) {
                if (dst.getParentFile().mkdirs() == false) {
                    throw new IOException("Destination '" + dst
                            + "' directory cannot be created");
                }
            }

            //文件不会自动保存到服务器，必须通过流操作
           in = new BufferedInputStream( new FileInputStream(src), BUFFER_SIZE);
           out = new BufferedOutputStream( new FileOutputStream(dst), BUFFER_SIZE);
            byte [] buffer = new byte [BUFFER_SIZE];
            while (in.read(buffer) > 0 ) {
               out.write(buffer);
           } 
       } finally {
            if ( null != in) {
               in.close();
           } 
            if ( null != out) {
               out.close();
           } 
       } 
   } catch (Exception e) {
       e.printStackTrace();
   }

}

private static String getExtention(String fileName) {
    int pos = fileName.lastIndexOf(".");
    return fileName.substring(pos);

}

@Override
public String execute() {

imageFileName = new Date().getTime() + getExtention(fileName);
File imageFile = new File(ServletActionContext.getServletContext().getRealPath( "/UploadImages" ) + "/" + imageFileName);
copy(myFile, imageFile);
System.out.println("haha");
return SUCCESS;
}

}

struts.xml：



image/gif

/fail.jsp
/success.jsp

applicationContext.xml：

web.xml：

struts2
org.apache.struts2.dispatcher.FilterDispatcher

struts2
/*

struts-cleanup

org.apache.struts2.dispatcher.ActionContextCleanUp

struts-cleanup
/*

org.springframework.web.context.ContextLoaderListener

怎么用struts2上传图片或文件。。

zhangfeifei89757

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