Java实现删除本地文件时的如何实现文件路径获取

Question

try {
          
            InputStream streamIn = deleteFile.getInputStream();
            System.out.println("inputStream"+streamIn.toString());
            OutputStream streamOut = new FileOutputStream(_deleteActionForm.getDeleteFileDir() + "/" + fileName);
            System.out.println("outputStream");
            
            File _file = new File(_deleteActionForm.getDeleteFileDir()+ fileName);
            if (_file.isAbsolute()) {
                _file.delete();
            }
            streamOut.close();
            streamIn.close();
            _deleteActionForm.setFname(_deleteActionForm.getDeleteFileDir()+"/"+fileName);
            _deleteActionForm.setSize(fileSize);
            return true;
        }        catch (Exception e) {
            e.toString();
            return false;
        }俺想用这段代码在实现本地的文件删除，编译没有错，但是选取的文件的路径总是为Null，麻烦大家帮我看下要如何修改，谢谢！

Answer 1

_deleteActionForm.getDeleteFileDir() 的代码？

Answer 2

package commonlib;import jbxstruts.*;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import java.io.*;
import java.io.File;
import javax.servlet.http.*;
import org.apache.struts.upload.FormFile;
import org.apache.struts.action.ActionMapping;
import commonlib.FileDelete;public class FileDelete extends Action{
    public FileDelete() {
    }    public Boolean dowork(ActionForm form) {
        ActionMapping mapping;
        HttpServletRequest request;
        HttpServletResponse response;
        DeleteActionForm _deleteActionForm = (DeleteActionForm) form;
        FormFile deleteFile = _deleteActionForm.getFile();        if (deleteFile == null) {
            return false;
        }        String fileName = deleteFile.getFileName();
        String fileSize = Integer.toString(deleteFile.getFileSize()) + " bytes";        try {
            String filePath = servlet.getServletContext().getRealPath("/upload")+"\\"+fileName;
            //String filePath=_deleteActionForm.getDeleteFileDir()+"\\"+fileName;
            InputStream streamIn = deleteFile.getInputStream();
            System.out.println("inputStream");
            //OutputStream streamOut = new FileOutputStream(filePath);
            System.out.println("outputStream");            File _file = new File(filePath);
            if (_file.exists()) {
                System.gc();
                _file.delete();            }
            //streamOut.close();
            streamIn.close();
            _deleteActionForm.setFname(filePath);
            _deleteActionForm.setSize(fileSize);
            return true;
        }        catch (Exception e) {
            e.toString();
            return false;
        }
    }
}

Answer 3

package jbxstruts;
import commonlib.*;
import org.apache.struts.action.ActionForm;
import org.apache.struts.upload.FormFile;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionMapping;
import javax.servlet.http.HttpServletRequest;public class DeleteActionForm extends ActionForm
{
    private FormFile file;
    private String fname;
    private String size;
    private String deleteFileDir;
    public FormFile getFile() {
        return file;
    }    public void setFile(FormFile file) {
        this.file = file;
    }    public void setFname(String fname)
    {
        this.fname = fname;
    }    public String getFname()
    {
        return this.fname;
    }    public void setSize(String size)
    {
        this.size = size;
    }    public String getSize()
    {
        return this.size;
    }    public String getDeleteFileDir()
    {
        return this.deleteFileDir;
    }    public void setDeleteFileDir(String deleteFileDir)
    {
        this.deleteFileDir = deleteFileDir;
       // return deleteFileDir;
    }    public ActionErrors validate(ActionMapping actionMapping,
                                 HttpServletRequest httpServletRequest) {
            /** @todo: finish this method, this is just the skeleton.*/
        return null;
    }    public void reset(ActionMapping actionMapping,
                      HttpServletRequest servletRequest) {
    }
}

Answer 4

package jbxstruts;
import commonlib.*;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.Action;
import java.io.*;
import javax.servlet.http.*;
import org.apache.struts.upload.FormFile;
//import Model.*;public class FileAction extends Action {
    public ActionForward execute(ActionMapping mapping, ActionForm form,
                                 HttpServletRequest request,
                                 HttpServletResponse response) {
        FileActionForm _fileActionForm = (FileActionForm) form;
        _fileActionForm.setUploadFileDir(this.servlet.getServletContext().getRealPath("/upLoadFile"));//上传的文件保存的目录        FileUpload _fileUpload = new FileUpload();        if(_fileUpload.dowork(_fileActionForm)  == false)
        {
            return mapping.findForward("uploadFailure");
        }
        return mapping.findForward("uploadSuccess");
    }
}

Answer 5

File对象本身就有两个api来得到File的路径的，查一下API就街道的了。