JSF文件上传功能

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最近项目需要用jsf1.2实现文件上传功能，我没有采用myfaces，而是用Apache MyFaces Trinidad 这个实现的文件上传，实现方法和myfaces是一样的。页面采用的是.xhtml。

Apache MyFaces Trinidad是一个基于部分Oracle's ADF Faces构建的JSF1.2组件库。我们要先下在它的jar包，然后导入到我们工程里面。http://myfaces.apache.org/trinidad/index.html这个链接里有文档和包的下载。

下面来看看代码，首先要配置web.xml文件，配置文件里的UPLOAD_MAX_MEMORY设置成500k说明只要是小于500k的文件都会存放在memory里面，UPLOAD_MAX_DISK_SPACE设置成5000k说明上传文件最大为5000k，并且大小在500k和5000k之间的文件才会存放在磁盘默认路径里面，UPLOAD_TEMP_DIR用来设置存放文件的路径

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://java.sun.com/xml/ns/javaee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.5"

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

<context-param>

<param-name>org.apache.myfaces.trinidad.UPLOAD_MAX_MEMORY</param-name>

<param-value>512000</param-value>

</context-param>

<context-param>

<param-name>org.apache.myfaces.trinidad.UPLOAD_MAX_DISK_SPACE</param-name>

<param-value>5120000</param-value>

</context-param>

<context-param>

<param-name>org.apache.myfaces.trinidad.UPLOAD_TEMP_DIR</param-name>

<param-value>/tmp/TrinidadUploads/</param-value>

</context-param>

<!-- This filter is always required; one of its functions is

file upload. -->

<filter-name>trinidad</filter-name>

<filter-class>org.apache.myfaces.trinidad.webapp.TrinidadFilter</filter-class>

</filter>

</web-app>

然后是faces-config.xml的配置信息

<?xml version='1.0' encoding='UTF-8'?>

<faces-config xmlns="http://java.sun.com/xml/ns/javaee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd"

version="1.2">

<navigation-rule>

<from-view-id>/upload/upload.xhtml</from-view-id>

<navigation-case>

<from-outcome>uploadedfile</from-outcome>

<to-view-id>/upload/uploadlist.xhtml</to-view-id>

</navigation-case>

</navigation-rule>

<managed-bean>

<managed-bean-name>upLoadBean</managed-bean-name>

<managed-bean-class>

com.lw.bean.UpLoadBean

</managed-bean-class>

<managed-bean-scope>request</managed-bean-scope>

</managed-bean>

</faces-config>

UpLoadBean类

package com.lw.bean;

import java.io.BufferedInputStream;

import java.io.IOException;

import java.io.InputStream;

import javax.faces.application.FacesMessage;

import javax.faces.context.FacesContext;

import org.apache.myfaces.trinidad.model.UploadedFile;

public class UpLoadBean {

private UploadedFile file;

public UploadedFile getFile() {

return file;

}

public void setFile(UploadedFile file) {

this.file = file;

}

public String uploadedfile() {

try {

FacesContext context = FacesContext.getCurrentInstance();

//在控制台输出上传文件的文件名，和文件大小

FacesMessage message = new FacesMessage(

"Successfully uploaded file" + file.getFilename() + "("

+ file.getLength() + "bytes)");

context.addMessage(null, message);

InputStream stream;

stream = new BufferedInputStream(file.getInputStream());

byte[] bytes = new byte[1024 * 1024];//设定文件大小

@SuppressWarnings("unused")

int count;

count = stream.read(bytes);

stream.close();//关闭流

return "uploadedfile";

} catch (IOException e) {

e.printStackTrace();

return null;

}

上传页面upload.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:u="http://java.sun.com/blueprints/ui"

xmlns:c="http://java.sun.com/jsp/jstl/core"

xmlns:h="http://java.sun.com/jsf/html"

xmlns:a4j="https://ajax4jsf.dev.java.net/ajax"

xmlns:f="http://java.sun.com/jsf/core"

xmlns:tr="http://myfaces.apache.org/trinidad" xml:lang="en" lang="en">

<head>

<title>My Facelets Page</title>

content="A short description of this page." />

</script>

</head>

<body>

<f:view>

<tr:form usesUpload="true">

<tr:inputFile label="上传:" value="#{upLoadBean.file}" />

<tr:commandButton text="开始" action="#{upLoadBean.uploadedfile}" />

</tr:form>

</f:view>

</body>

</html>

显示上传文件的文件名和文件大小的页面uploadlist.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" xml:lang="en" lang="en">

<head>

<title>My Facelets Page</title>

content="A short description of this page." />

</head>

<body>

<f:view>

<h:panelGrid border="0" columns="2" style="width: 411px">

<h:outputText value="文件名：" />

<h:outputText value="#{upLoadBean.file.filename}" />

<h:outputText value="文件大小：" />

<h:outputText value="#{upLoadBean.file.length}" />

</h:panelGrid>

</f:view>

</body>

</html>

现在功能已经实现了，不过这个程序上传的文件成功后，会把文件变成tmp文件，不过我需要的功能已经实现了，因为我上传的是excel和work文件，然后用POI解析tmp文件，把它存入数据库就可以了。