java - 宛先で文字列を使用するには?

Question

うまくいけば、簡単な質問:

ログインページからユーザー名を取得するコードを作成しました：

private String username;

@PostConstruct
public void init() {
    username = FacesContext.getCurrentInstance().getExternalContext().getRemoteUser();
}

しかし、私がやりたいのは、この宛先の最後にユーザー名を追加することです:

private String destination = "C:/Users/Richard/printing~subversion/fileupload/web/WEB-INF/uploaded/";

宛先がユーザー名を呼び出して、そのユーザーに固有のファイルにドキュメントを配置するようにするにはどうすればよいですか? これはすべて同じ Bean にあります

これは私の現在の豆です

@ManagedBean(name = "fileUploadController")
public class FileUploadController {

    private String username;

    @PostConstruct
    public void init() {
        username = FacesContext.getCurrentInstance().getExternalContext().getRemoteUser();
    }
    private String destination = "C:/Users/Richard/printing~subversion/fileupload/web/WEB-INF/uploaded/"; // main location for uploads
    File theFile = new File(destination + username); // will create a sub folder for each user 

    public void handleFileUpload(FileUploadEvent event) {
        FacesMessage msg = new FacesMessage("Succesful", event.getFile().getFileName() + " is uploaded.");
        FacesContext.getCurrentInstance().addMessage(null, msg);
        try {
            copyFile(event.getFile().getFileName(), event.getFile().getInputstream());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void copyFile(String fileName, InputStream in) {
        try {


            // write the inputStream to a FileOutputStream
            OutputStream out = new FileOutputStream(new File(theFile + "/" + fileName)); // cannot find path when adding username atm
            System.out.println(theFile); //testing 

            int read = 0;
            byte[] bytes = new byte[1024];

            while ((read = in.read(bytes)) != -1) {
                out.write(bytes, 0, read);
            }

            in.close();
            out.flush();
            out.close();
//make sure new file is created, (displays in glassfish server console not to end user)
            System.out.println("New file created!");
        } catch (IOException e) {
            System.out.println(e.getMessage());
        }
    }
}

現在の編集:

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package richard.fileupload;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.annotation.PostConstruct;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.context.FacesContext;

import org.primefaces.event.FileUploadEvent;

@ManagedBean(name = "fileUploadController")
public class FileUploadController {

    private String username;

    @PostConstruct
    public void init() {
        username = FacesContext.getCurrentInstance().getExternalContext().getRemoteUser();
    }
    private String destination = "C:/Users/Richard/printing~subversion/fileupload/web/WEB-INF/uploaded/"; // main location for uploads
    File theFile = new File(destination + username); // will create a sub folder for each user 

    public void handleFileUpload(FileUploadEvent event) {
        FacesMessage msg = new FacesMessage("Succesful", event.getFile().getFileName() + " is uploaded.");
        FacesContext.getCurrentInstance().addMessage(null, msg);
        try {
            copyFile(event.getFile().getFileName(), event.getFile().getInputstream());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public File getDirectory(String destination, String username) {
        //set the user directory from the destinarion and the logged user name
        File directory = new File(destination, username);
        //check if the location exists
        if (!directory.exists()) {
            //let's try to create it
            try {
                directory.mkdir();
            } catch (SecurityException secEx) {
                //handle the exception
                secEx.printStackTrace(System.out);
                directory = null;
            }
        }
        return directory;
    }


    public void copyFile(String fileName, InputStream in) {
        try {


            // write the inputStream to a FileOutputStream
            OutputStream out = new FileOutputStream(new File(directory)); // cannot find path when adding username atm
            System.out.println(directory); //testing 

            int read = 0;
            byte[] bytes = new byte[1024];

            while ((read = in.read(bytes)) != -1) {
                out.write(bytes, 0, read);
            }

            in.close();
            out.flush();
            out.close();
//make sure new file is created, (displays in glassfish server console not to end user)
            System.out.println("New file created!");
        } catch (IOException e) {
            System.out.println(e.getMessage());
        }
    }
}

編集：：：：

今ディレクトリと言って、out = new FileOutputStream(new File(directory));シンボルが見つからないのも慣れrealFileない

現在のコード:

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package richard.fileupload;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.annotation.PostConstruct;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.context.FacesContext;

import org.primefaces.event.FileUploadEvent;

@ManagedBean(name = "fileUploadController")
public class FileUploadController {

    private String username;

    @PostConstruct
    public void init() {
        username = FacesContext.getCurrentInstance().getExternalContext().getRemoteUser();
    }
    private String destination = "C:/Users/Richard/printing~subversion/fileupload/web/WEB-INF/uploaded/"; // main location for uploads
    File theFile = new File(destination + username); // will create a sub folder for each user (currently does not work, below hopefully is a solution) 

    public File getDirectory(String destination, String username) { // currently not working, is not calling the username or directory 
        //set the user directory from the destinarion and the logged user name
        File directory = new File(destination, username);
        //check if the location exists
        if (!directory.exists()) {
            //let's try to create it
            try {
                directory.mkdir();
            } catch (SecurityException secEx) {
                //handle the exception
                secEx.printStackTrace(System.out);
                directory = null;
            }
        }
        return directory;
    }

    public void handleFileUpload(FileUploadEvent event) {
        FacesMessage msg = new FacesMessage("Succesful", event.getFile().getFileName() + " is uploaded.");
        FacesContext.getCurrentInstance().addMessage(null, msg);
        try {
            copyFile(event.getFile().getFileName(), event.getFile().getInputstream());
        } catch (IOException e) {
            //handle the exception
            e.printStackTrace();
        }
    }

 public void copyFile(String fileName, InputStream in) {
    //get the directory assigned to the current user
    File userDirectory = getDirectory(destination, username);
    if (userDirectory != null) {
        OutputStream out = null;
        try {
            File realFile = new File(userDirectory, fileName);
            out = new FileOutputStream(new File(directory));
            int read = 0;
            //1024 must be a constant
            //also, it must be 4098 (4 KBs) for better performance
            byte[] bytes = new byte[1024];
            while ((read = in.read(bytes)) != -1) {
                out.write(bytes, 0, read);
            }
            in.close();
            out.flush();
        } catch (IOException e) {
            System.out.println(e.getMessage());
        } finally {
            out.close();
        }
    }
}

もう一度編集してください笑：

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package richard.fileupload;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.annotation.PostConstruct;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.context.FacesContext;

import org.primefaces.event.FileUploadEvent;

@ManagedBean(name = "fileUploadController")
public class FileUploadController {

    private String username;

    @PostConstruct
    public void init() {
        username = FacesContext.getCurrentInstance().getExternalContext().getRemoteUser();
    }
    private String destination = "C:/Users/Richard/printing~subversion/fileupload/web/WEB-INF/uploaded/"; // main location for uploads (will change this thanks to adivce )
    File theFile = new File(destination + username); // will create a sub folder for each user (currently does not work, below hopefully is a solution) 

    public File getDirectory(String destination, String username) { 
        // currently not working, is not calling the username or destination 
        //set the user directory from the destinarion and the logged user name
        File directory = new File(destination, username);
        //check if the location exists
        if (!directory.exists()) {
            //let's try to create it
            try {
                directory.mkdir();
            } catch (SecurityException secEx) {
                //handle the exception
                secEx.printStackTrace(System.out);
                directory = null;
            }
        }
        return directory;
    }

    public void handleFileUpload(FileUploadEvent event) {
        FacesMessage msg = new FacesMessage("Succesful", event.getFile().getFileName() + " is uploaded.");
        FacesContext.getCurrentInstance().addMessage(null, msg);
        try {
            copyFile(event.getFile().getFileName(), event.getFile().getInputstream());
        } catch (IOException e) {
            //handle the exception
            e.printStackTrace();
        }
    }

    public void copyFile(String fileName, InputStream in) {
    //get the directory assigned to the current user
    File userDirectory = getDirectory(destination, username);
    if (userDirectory != null) {
        OutputStream out;
        try {
            File realFile = new File(userDirectory, fileName);//realFile variable not used
            out = new FileOutputStream(new File(userDirectory));// no suitable constructor found for File(File)
            int read = 0;
            byte[] bytes = new byte[1024];
            while ((read = in.read(bytes)) != -1) {
                out.write(bytes, 0, read);
            }
            in.close();
            out.flush();
            out.close();
        } catch (IOException e) {
            System.out.println(e.getMessage());
        }
    }
}
}

    /**
    public void copyFile(String fileName, InputStream in) {
        try {


            // write the inputStream to a FileOutputStream
            OutputStream out = new FileOutputStream(new File(directory)); // cannot find path when adding username atm
            System.out.println(directory); //testing 

            int read = 0;
            byte[] bytes = new byte[1024];

            while ((read = in.read(bytes)) != -1) {
                out.write(bytes, 0, read);
            }

            in.close();
            out.flush();
            out.close();
//make sure new file is created, (displays in glassfish server console not to end user)
            System.out.println("New file created!");
        } catch (IOException e) {
            System.out.println(e.getMessage());
        }
    }
}
*/

これは私の最新バージョンのコードです。変更しようとしましたが、現在いくつかのエラーがスローされています。コードのコメントにエラーを追加しました。パブリックファイルgetDirectory(String destination, String username)は正しい場所にありますか? ありがとう、単純なことをするのにこれほど多くの仕事をしなければならないとは思ってもみませんでした! :D

score 1 · Accepted Answer

Fileあなたの問題は、JSFの問題よりもクラスの使用に関連しています。

このクラスを使用して、ファイルまたはディレクトリを処理できます。まず、次の 2 つの方法があります。

ユーザーディレクトリを取得するメソッド
ユーザーディレクトリにファイルを保存するメソッド

基本的な例:

//note: this must be moved to an utility class
public File getDirectory(String destination, String username) {
    //set the user directory from the destinarion and the logged user name
    File directory = new File(destination, username);
    //check if the location exists
    if (!directory.exists()) {
        //let's try to create it
        try {
            directory.mkdir();
        } catch (SecurityException secEx) {
            //handle the exception
            //this is a naive way to do it
            secEx.printStackTrace(System.out);
            directory = null;
        }
    }
    return directory;
}

public void saveFile(String fileName, byte[] data) {
    //get the directory assigned to the current user
    File userDirectory = getDirectory(destination, username);
    if (userDirectory != null) {
        //create the real file using the directory as parent directory
        //we'll give the file name too
        //check the different constructors for File class
        File realFile = new File(userDirectory, fileName);
        //save the file the way you want/need...
        //this should be also in an utility class
        FileOutputStream fos;
        try {
            fos = new FileOutputStream(realFile);
            fos.write(myByteArray);
        } catch (Exception ex) {
            //handle the exception
            ex.printStackTrace(System.out);
        } finally {
            if (fos != null)
                fos.close();
        }
    }
}

参考文献:

質問の編集に基づいて、私が提案しcopyFileた方法のように見えるように変更する必要があります。saveFileを使用するように実装を変更しますInputStream。

public void copyFile(String fileName, InputStream in) {
    //get the directory assigned to the current user
    File userDirectory = getDirectory(destination, username);
    if (userDirectory != null) {
        OutputStream out;
        try {
            File realFile = new File(userDirectory, fileName);
            out = new FileOutputStream(new File(userDirectory));
            int read = 0;
            //1024 must be a constant
            //also, it must be 4098 (4 KBs) for better performance
            byte[] bytes = new byte[1024];
            while ((read = in.read(bytes)) != -1) {
                out.write(bytes, 0, read);
            }
            in.close();
            out.flush();
        } catch (IOException e) {
            System.out.println(e.getMessage());
        } finally {
            out.close();
        }
    }
}

java - 宛先で文字列を使用するには?

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