fileuploadbean.java

这是一个jsf上传下载文件的例子

package com.windy.fileupload;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.util.List;

import javax.faces.component.html.HtmlDataTable;
import javax.faces.component.html.HtmlInputHidden;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.myfaces.custom.fileupload.UploadedFile;


public class FileUploadBean {
	private UploadedFile myFile;
	DBConnection conn=new DBConnection();
	public UploadedFile getMyFile() {
		return myFile;
	}

	public void setMyFile(UploadedFile myFile) {
		this.myFile = myFile;
	}
	
	
	public void action(String filename,String path){
		try {
			Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
			Connection conn=DriverManager.getConnection("jdbc:microsoft:sqlserver://127.0.0.1:1433;DatabaseName=pubs","sa","sa");
			PreparedStatement stm=conn.prepareStatement("insert into filelist(filename,filepath)values(?,?)");
			stm.setString(1,filename);
			stm.setString(2,path);
			stm.execute();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	
	
	
	public String processFile(){
		try {
			long time=System.currentTimeMillis();
			String fileName=new File(myFile.getName()).getName();
			System.out.println(fileName);
			InputStream in=myFile.getInputStream();
			FacesContext ctx=FacesContext.getCurrentInstance();
			HttpSession hs=(HttpSession)ctx.getExternalContext().getSession(true);
			String directory=hs.getServletContext().getRealPath("\\")+"upload";
			File fileDir=new File(directory);
			if(!fileDir.exists()){
				if(!fileDir.mkdir()){
					System.out.println("文件夹创建失败");
				}
			}
			
			
			String file=hs.getServletContext().getRealPath("\\")+"upload\\"+fileName;
			this.action(fileName,file);
			BufferedOutputStream out=new BufferedOutputStream(new FileOutputStream(file));
			byte[] buffer=new byte[1024*2];
			int length;
			while((length=in.read(buffer,0,buffer.length))>0){
				out.write(buffer,0,length);
			}
			out.flush();
			out.close();
			long t=System.currentTimeMillis()-time;
			return "success";
		} catch (Exception e) {
			e.printStackTrace();
			return "error";
		}
	}
	
	
	public List getFileList(){
		return conn.getFile();
	}

	public String getpath(){
		FacesContext ctx = FacesContext.getCurrentInstance();
		HtmlInputHidden inputtextValue = (HtmlInputHidden)ctx.getViewRoot().findComponent("frm:filepath");
		return (String) (inputtextValue.getValue());
	}
	
	
	
	public String download() {
		
		FacesContext ctx = FacesContext.getCurrentInstance();
		HttpServletRequest request=(HttpServletRequest)ctx.getExternalContext().getRequest();
		
		String filepath=conn.getfilepath(Integer.parseInt(request.getParameter("fileid")));
		if(!new File(filepath).exists()){
			System.out.println("文件不存在...........");
			return "";
		}
		try {
			String contentType = "application/octet-stream;charset=iso8859-1";
			HttpServletResponse response = (HttpServletResponse) ctx
					.getExternalContext().getResponse();
			response.setContentType(contentType);
			StringBuffer contentDisposition = new StringBuffer();
			contentDisposition.append("attachment;");
			contentDisposition.append("filename=\"");
			contentDisposition.append(new File(filepath).getName());
			contentDisposition.append("\"");
			//logger.debug(System.getProperty("file.encoding"));
			response.setHeader("Content-Disposition", new String(
					contentDisposition.toString().getBytes(
							System.getProperty("file.encoding")), "iso8859-1"));
			//logger.debug(contentDisposition.toString());
			OutputStream out = response.getOutputStream();

			byte[] bytes = new byte[1024];
			InputStream is = new FileInputStream(filepath);
			int b = 0;
			while ((b = is.read(bytes, 0, 1024)) > 0) {
				out.write(bytes, 0, b);
			}
			is.close();
			out.flush();
			ctx.responseComplete();
			
		} catch (Exception e) { 
			e.printStackTrace();
		}
		return "";
	}
	
	
	public void execute(ActionEvent event){
		HtmlDataTable datatable=(HtmlDataTable)event.getComponent();
		System.out.println(datatable.getRowData());
	}
	
	
	
	
	
	public void printDirectory(){
		FacesContext ctx=FacesContext.getCurrentInstance();
		HttpServletRequest req=(HttpServletRequest)ctx.getExternalContext().getRequest();
		String directory=req.getRealPath("/")+"upload";
		File file=new File(directory);
		String[] files=file.list();
		System.out.println(">>>>>>>>>>>>>>>>>>>>>");
		for (int i = 0; i < files.length; i++) {
			System.out.println(files[i]);
		}
		System.out.println(">>>>>>>>>>>>>>>>>>>>>");
	}
	
}