0

希望是一个简单的问题：

我创建了从登录页面获取用户名的代码：

private String username;

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

但我想要做的是将用户名添加到此目的地的末尾：

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

我该怎么做才能让目的地调用用户名将文档放在特定于该用户的文件中？这都在同一个豆子里

这是我目前的豆

@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());
        }
    }
}

当前编辑：

/*
 * 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());
        }
    }
}

编辑 ：：：：

现在说目录，在out = new FileOutputStream(new File(directory));找不到符号我realFile也不习惯

当前代码：

/*
 * 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();
        }
    }
}

再次编辑大声笑：

/*
 * 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());
        }
    }
}
*/

这是我最新版本的代码，我试图修改它，但它当前抛出一些错误，我在代码的注释中添加了错误，公共文件是否getDirectory(String destination, String username)在正确的位置？谢谢，我从没想过我必须做这么多工作才能做一些简单的事情！:D

4

1 回答 1

1

您的问题与File类使用有关，而不是 JSF 问题。

您可以使用此类来处理文件或目录。首先，您可以有两种方法：

  • 将检索用户目录的方法

  • 一种将文件保存在用户目录中的方法

基本示例：

//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：

根据您的问题编辑，您必须修改copyFile才能看起来像saveFile我提出的方法。我将更改实现以使用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();
        }
    }
}
于 2013-01-30T22:55:57.797 回答