如何用JSF技术上传文件（PrimeFaces）

Kai233

于 2015-03-14 15:43:41 发布

阅读量3k

点赞数

CC 4.0 BY-SA版权

文章标签： jsf 技术 Primefaces xhtml 上传文件

本文链接：https://blog.youkuaiyun.com/acmpackage2/article/details/44260197

本文介绍了如何利用JSF框架的PrimeFaces组件来实现在xhtml页面上进行文件上传的功能，详细讲解了UploadImg_student托管Bean在这一过程中的作用。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

UploadImg_student 托管Bean

package pojo.student;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.faces.application.FacesMessage;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.servlet.http.HttpSession;

import org.primefaces.model.UploadedFile;

import dao.DAOFactory;
import dao.student.StudentDAO;

import pojo.Student;

public class UploadImg_student {
	
	FacesContext facesContext = FacesContext.getCurrentInstance();
    ExternalContext extContext =facesContext.getExternalContext();
    HttpSession session =(HttpSession)extContext.getSession(true);
    private DAOFactory dao = DAOFactory.getDAOFactory(DAOFactory.MYSQL);
    private StudentDAO studentdao = dao.getStudentDAO();
   

	private UploadedFile file;
	
	public UploadedFile getFile() {
		return file;
	}
	public void setFile(UploadedFile file) {
		this.file = file;
	}

	
    public void submit() throws IOException{  
    	Student stu = (Student) this.session.getAttribute("student");
    	String stu_name = stu.getStu_name();
    	
    	String rootPath = session.getServletContext().getRealPath("/upload/"); //得到服务器相对路径 
    	File outputPath = new File(rootPath);
    	File outputFile = new File(rootPath, file.getFileName()); //根据文件名创建路径
		if (!outputPath.exists()) {  
			outputPath.mkdir();  //如果upload文件夹不存在就创建
		} 
    	byte[] buffer = file.getContents(); //得到上传文件的内容
		FileOutputStream outStream = new FileOutputStream(outputFile);
		outStream.write(buffer);
		outStream.close();
		
		String imgURL = "/JSFDemo" + "/upload/" + file.getFileName();
		
		
		Pattern pat = Pattern.compile("(\\.|\\/)(gif|jpe?g|png)");  
		Matcher mat = pat.matcher(file.getFileName());  
		boolean rs = mat.find();   
		
		if(!rs) {
			facesContext.addMessage(null,  new FacesMessage("文件格式不正确"));
			return;
		}
		
		studentdao.updateIconByName(stu_name, imgURL);
		stu.setStu_icon(imgURL);
    	System.out.println(rootPath);
        System.out.println("Uploaded file name : " + file.getFileName());  
        System.out.println(outputFile);
    
    
    
    }  
    
	
}

uploadimg.xhtml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml"
	xmlns:ui="http://java.sun.com/jsf/facelets"
	xmlns:h="http://java.sun.com/jsf/html"
	xmlns:f="http://java.sun.com/jsf/core" 
	xmlns:p="http://primefaces.org/ui"
	xml:lang="en" lang="en">
	<ui:composition template="/templates/student.xhtml">
	<ui:define name="title">上传头像</ui:define>
	<ui:define name="css"><link href="#{request.contextPath}/css/student/uploadImg.css" rel="stylesheet" type="text/css" /></ui:define>
	<ui:define name="content">
	 <div id="content" >
	 <h:outputText value="您的头像：" />
	 <img src="#{sessionScope.student.stu_icon }" width="160" height="160"/>
	 <h:form enctype="multipart/form-data">
		<p:fileUpload value="#{uploadImg_student.file}" mode="simple"/>
		<p:commandButton value="提交" ajax="false" actionListener="#{uploadImg_student.submit}"/>
		<h:messages />
	</h:form>
	 </div>
	</ui:define>
	</ui:composition>
</html>

在faces-config.xml中注册Bean

	<managed-bean>
		<managed-bean-name>uploadImg_student</managed-bean-name>
		<managed-bean-class>pojo.student.UploadImg_student</managed-bean-class>
		<managed-bean-scope>request</managed-bean-scope>
	</managed-bean>