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今天练了一下excel的上传及获取数据，需要对文件类型进行判断，所以需要获取文件的后缀名，方法如下：

public class UploadFile extends ActionSupport{    private File excelfile;  //获取上传的excel文件    private String excelfileFileName;      //获取文件名    private String excelfileContentType;     //    private List<Excel> list;//  private String excelfileContentType;    public File getExcelfile() {        return excelfile;    }    public void setExcelfile(File excelfile) {        this.excelfile = excelfile;    }//  public String getExcelfileContentType() {//      return excelfileContentType;//  }////  public void setExcelfileContentType(String excelfileContentType) {//      this.excelfileContentType = excelfileContentType;//  }    @Override    public String execute() throws Exception {        // TODO Auto-generated method stub        System.out.println("zzx "+excelfile);        System.out.println("zzx"+excelfileContentType);                System.out.println(*****excelfileFileName.substring(excelfileFileName.lastIndexOf(".")+1)*****);        //此处即可获得文件名的后缀        System.out.println("zzx"+excelfileFileName);        list=new JxlReadExcel().main(excelfile);        if(list==null){            System.out.println("有错");            return ERROR;        }        new ExcelDao().add(list);        return SUCCESS;    }    public String getExcelfileFileName() {        return excelfileFileName;    }    public void setExcelfileFileName(String excelfileFileName) {        this.excelfileFileName = excelfileFileName;    }    public List<Excel> getList() {        return list;    }    public void setList(List<Excel> list) {        this.list = list;    }    public String getExcelfileContentType() {        return excelfileContentType;    }    public void setExcelfileContentType(String excelfileContentType) {        this.excelfileContentType = excelfileContentType;    }}

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