Java 缓冲写入到可公开访问的位置

Question

我正在尝试更改我之前编写的程序。目前该程序处理一些内置逻辑的 BufferedReader 和 BufferedWriters。让我解释一下它过去是如何工作的。

Class 用于上传文件：

public void getFile(){//Used to upload the ACH file. 

        while(uploadApproval==false){//While upload approval has not been given..

        JFileChooser chooser = new JFileChooser();//Creates a new object of the JFileChooser class. 

        uploadFile = chooser;//Saves the upload file variable as the chooser response. 

        FileNameExtensionFilter filter = new FileNameExtensionFilter("ACH Files", "ach");
        //Sets the allowed file formats for upload. 

        chooser.setFileFilter(filter);//Activates the created file filter.

        chooser.setDialogTitle("Please choose ACH file to upload");//Sets the title bar text. 

        //Completes once the user clicks ok. 
        int returnVal = chooser.showOpenDialog(chooser);//
        if(returnVal == JFileChooser.APPROVE_OPTION){
            uploadApproval=true;
        }else{
            System.exit(0);
        }

    }
}

Class用于设置目录

public void setDirectory(){//Used to set the directory. 

        while(saveApproval==false){//While the user does not have approval of the save location..

        JFileChooser chooser2 = new JFileChooser();//Creates a new JFileChooser object.

        saveFile = chooser2;//Sets the save file location to chooser2. 

        chooser2.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);//User is only able to scan for 
        //directories. 

        //Completes once the user clicks okay. 
        int returnValue2 = chooser2.showDialog(chooser2, "Directory to save");
        if(returnValue2 == JFileChooser.APPROVE_OPTION){
            saveApproval=true;
        }else{
            System.exit(0);
        }

        }

    }

然后我开始实际的缓冲 reader/writer 过程，这里涉及很多逻辑：

location = "//NachaOutput"+randomNumber+".ACH";

        try{

            String sCurrentLine;//String representing the current line. 

            //Pulls the uploaded file. 
            br = new BufferedReader(new FileReader(NachaMain.uploadFile.getSelectedFile()));




            bw = new BufferedWriter(new FileWriter(NachaMain.saveFile.getSelectedFile()+location));

现在这是我需要做的。我被要求从一开始就删除用户 selects 目录所在的屏幕。相反，用户将 select 该过程结束时的保存目录。

这意味着根本不会调用"SetDirectory"方法，因此这行代码：

bw = new BufferedWriter(new FileWriter(NachaMain.saveFile.getSelectedFile()+location));

显然行不通。我需要找到一些方法来用通用位置替换该文件编写器位置，该通用位置对于所有用户都是相同的，无论他们的设置如何。沿着文件行的东西。

我试过这样做：

bw = new BufferedWriter(new FileWriter("Libraries\Documents"+location));

但是遇到关于无效路径的异常。

所以请帮帮我，让我知道一个可以自动保存文件的好路径。保存的文件基本上是一个 "dummy" 文件。稍后在程序结束时，我会将那个虚拟文件复制到用户指定的位置，然后将其删除，所以位置真的无关紧要。

提前致谢！

Answer 1

您可以使用 File.createTempFile(). It might make cleanup easier if you called deleteOnExit() 为创建的临时文件创建一个临时文件。

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