struts2+extjs文件上傳完整實現(解決了上傳中的各種問題)

    package cn.com.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 javax.servlet.http.HttpServletResponse;  

    import org.apache.struts2.ServletActionContext;  

    import cn.com.css.common.action.BaseAction;  


    public class FileUploadAction extends BaseAction {  

        private static final long serialVersionUID = 5156288255337069381L;  

        private  String msg;  
        private String contentType;  
        private File docmentFile;  
        private String fileName;  


        public String upload() throws Exception {  
            String realPath = "E:\\" + fileName;  
            if (docmentFile.isFile()) {  
                BufferedInputStream bis = new BufferedInputStream(  
                        new FileInputStream(docmentFile));  
                BufferedOutputStream bos = null;  
                try {  
                    bos = new BufferedOutputStream(new FileOutputStream(realPath));// 為以防萬一，以后寫文件的路徑盡量寫成正雙斜杠的  
                    // 從源文件中取數據，寫到目標文件中  
                    byte[] buff = new byte[8192];  
                    for (int len = -1; (len = bis.read(buff)) != -1;) {  
                        bos.write(buff, 0, len);  
                    }  
                    bos.flush();  
                } catch (IOException ie) {  
                    ie.printStackTrace();  
                    msg="文件上傳失敗";  
                    HttpServletResponse response = ServletActionContext.getResponse();  
                    response.setContentType("text/html;charset=UTF-8");  
                    return "none";  
                } finally {  
                    if (bis != null) {  
                        try {  
                            bis.close();  
                        } catch (IOException ie) {  
                            ie.printStackTrace();  
                        }  
                    }  
                    if (bos != null) {  
                        try {  
                            bos.close();  
                        } catch (IOException ie) {  
                            ie.printStackTrace();  
                        }  
                    }  
                }  
            }  
            msg="文件上傳成功";  
            HttpServletResponse response = ServletActionContext.getResponse();  
            response.setContentType("text/html;charset=UTF-8");  
            return "none";  
        }  

        public String getFileName() {  
            return fileName;  
        }  

        public void setFileName(String fileName) {  
            this.fileName = fileName;  
        }  

        // since we are using <s:file name="upload" .../> the file name will be  
        // obtained through getter/setter of <file-tag-name>FileName  
        public String getUploadFileName() {  
            return fileName;  
        }  

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

        // since we are using <s:file name="upload" ... /> the content type will be  
        // obtained through getter/setter of <file-tag-name>ContentType  
        public String getUploadContentType() {  
            return contentType;  
        }  

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

        // since we are using <s:file name="upload" ... /> the File itself will be  
        // obtained through getter/setter of <file-tag-name>  
        public File getUpload() {  
            return docmentFile;  
        }  

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

        public String getMsg() {  
            return msg;  
        }  

        public void setMsg(String msg) {  
            this.msg = msg;  
        }  

        public String getContentType() {  
            return contentType;  
        }  

        public void setContentType(String contentType) {  
            this.contentType = contentType;  
        }  

        public File getDocmentFile() {  
            return docmentFile;  
        }  

        public void setDocmentFile(File docmentFile) {  
            this.docmentFile = docmentFile;  
        }  

    }