如何用JSF技术上传文件（PrimeFaces）

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我是靠谱客的博主还单身龙猫，最近开发中收集的这篇文章主要介绍如何用JSF技术上传文件（PrimeFaces），觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

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>