希望是一个简单的问题：
我已创建代码以从登录页面获取用户名：
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，所以目的地会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bean
@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out = new FileOutputStream(new File(directory));中的目录无法找到符号，我也没有使用realFile
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LOL：
/*
* 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，但它当前抛出了一些错误，我在代码中的注释中添加了错误，也是公共文件getDirectory(String destination, String username)中的正确的地点 ？谢谢，我从来没有想过我会做这么多工作来做一些简单的事情！ ：d
答案 0 :(得分：1)
您的问题与File类使用情况更相关，而不是JSF问题。
您可以使用此类来处理文件或目录。首先，您可以使用两种方法：
将检索用户目录的方法
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();
}
}
}
参考文献：
根据您的问题编辑，您必须修改copyFile，以便将其视为我提议的saveFile方法。我将更改实施以使用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();
}
}
}