a.:
实现jsf应用的文件上传功能，可以使用MyFaces文件上传组件
依赖的库有 commons-io.jar，myfaces-api.jar，myfaces-impl.jar，tomahawk.jar
web.xml:
<filter>
<filter-name>MyfacesExtensionsFilter</filter-name>
<filter-class>
org.apache.myfaces.webapp.filter.ExtensionsFilter
</filter-class>
<init-param>
<param-name>uploadMaxFileSize</param-name>
<param-value>10m</param-value>
</init-param>
<init-param>
<param-name>uploadThresholdSize</param-name>
<param-value>50k</param-value>
</init-param>
<init-param>
<param-name>uploadRepositoryPath</param-name>
<param-value>../</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>MyfacesExtensionsFilter</filter-name>
<servlet-name>Faces Servlet</servlet-name>
</filter-mapping>
<filter-mapping>
<filter-name>MyfacesExtensionsFilter</filter-name>
<url-pattern>/faces/myFacesExtensionResource/*</url-pattern>
</filter-mapping>
////////////////////////////////
其他的jsf 和 myFaces 配置就不写在这里了
//////////////////////////////////
entity:student
public class Student{
public Student(){
}
private byte[] stuFileData;
private String stuFileName;
public void setStuFuleData(byte[] stuFileData){
this.stuFileData = stuFileData;
}
public byte[] getStuFileData(){
return this.stuFileData;
}
public void setStuFileName(String stuFileName){
this.stuFileName = stuFileName;
}
public String getStuFileName(){
return this.stuFileName;
}
}
受管bean:StudentAction
import org.apache.myfaces.custom.fileupload.UploadedFile;
public StudentAction{
private UploadedFile _upFile;
public String addStudent(){
// 获得文件的全名，含路径
String fileName = _upFile.getName();
if (!fileName.equals("")) {
File temp = new File(fileName);
// 获得文件名
fileName = temp.getName();
}
byte[] buffer = new byte[new Long(_upFile.getSize()).intValue()];
try {
buffer = _upFile.getBytes();
} catch (IOException e) {
e.printStackTrace();
}
Student student = new Student();
student.setStuDataName(fileName);
student.setStuDataFileData(buffer);
//studentDAO.save(student);
return null;
}
public String down(){
try {
//先检索student
Student student = stdentDAO.getStudent();
System.err.println("...................in...............");
FacesContext ctx = FacesContext.getCurrentInstance();
HttpServletResponse response = (HttpServletResponse)ctx.getExternalContext().getResponse();
String contentType = "application/x-msdownload;charset=utf-8";
response.setContentType(contentType);
response.setHeader("Content-disposition", "attachment; filename=\"" +student.getStuFileName+"\"");
ServletOutputStream out = response.getOutputStream();
if(null!=crFile)
out.write(crFile);
out.flush();
ctx.responseComplete();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public UploadedFile get_upFile() {
return _upFile;
}
public void set_upFile(UploadedFile file) {
_upFile = file;
}
}
jsp:
首先引入标签
<%@ taglib uri="http://myfaces.apache.org/tomahawk" prefix="t"%>
<h:form id="from" enctype="multipart/form-data">
<t:inputFileUpload id="fileupload" value="#{StudentAction._upFile}"/>
<h:commandButton action="StudentAction.addStudent" value="保存"/>
<h:commandButton action="StudentAction.down" value="下载附件"/>
</h:form>
以上程序未经调试，运行时可能会出现错误，不过用 myFaces 实现 jsf 的文件上传功能
需要注意的要点和关键性代码都已将完成了。
b.seam 的文件上传
seam应用的文件上传也可以使用 myFaces，使用方法和上面相同。
不过seam自身也提供了附件上传的组件功能，而且实现起来更简单:
xhtml文件:
首先引入标签
xmlns:s="http://jboss.com/products/seam/taglib"
<h:form id="from" enctype="multipart/form-data">
<s:fileUpload id="myFile" fileName="#{student.stuFileName}" data="#{student.stuFileData}"/>
<a4j:commandButton value="保存" action="#{StudentAction.addStuent}"/>
<a4j:commandButton value="下载附件" action="#{StudentAction.down}"/>
</h:form>
受管bean:StudentAction
import org.apache.myfaces.custom.fileupload.UploadedFile;
public StudentAction{
private Student student;
@In(request=false,create=true)
@Out(request=false)
public String addStudent(){
//studentDAO.save(student);
return null;
}
public String down(){
try {
//先检索student
Student student = stdentDAO.getStudent();
FacesContext ctx = FacesContext.getCurrentInstance();
HttpServletResponse response = (HttpServletResponse)ctx.getExternalContext().getResponse();
String contentType = "application/x-msdownload;charset=utf-8";
response.setContentType(contentType);
response.setHeader("Content-disposition", "attachment; filename=\"" +student.getStuFileName+"\"");
ServletOutputStream out = response.getOutputStream();
if(null!=crFile)
out.write(crFile);
out.flush();
ctx.responseComplete();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
entity:student
@Name("student")
public class Student{
public Student(){
}
private byte[] stuFileData;
private String stuFileName;
public void setStuFuleData(byte[] stuFileData){
this.stuFileData = stuFileData;
}
@Column(name="StuFileData",length=2147483647)
@Basic(fetch=FetchType.LAZY)
@Lob
public byte[] getStuFileData(){
return this.stuFileData;
}
public void setStuFileName(String stuFileName){
this.stuFileName = stuFileName;
}
@Column(name = "StuFileName", length = 100)
@Length(max = 100)
public String getStuFileName(){
return this.stuFileName;
}
}
特别注意 jsp form 的提交方式
<h:form id="from" enctype="multipart/form-data">
否则fileData不能传递到受管 bean
********************************* 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>
<!-- Maximum memory per request (in bytes) -->
<param-name>org.apache.myfaces.trinidad.UPLOAD_MAX_MEMORY</param-name>
<!-- Use 500K -->
<param-value>512000</param-value>
</context-param>
<context-param>
<!-- Maximum disk space per request (in bytes) -->
<param-name>org.apache.myfaces.trinidad.UPLOAD_MAX_DISK_SPACE</param-name>
<!-- Use 5,000K -->
<param-value>5120000</param-value>
</context-param>
<context-param>
<!-- directory to store temporary files -->
<param-name>org.apache.myfaces.trinidad.UPLOAD_TEMP_DIR</param-name>
<!-- Use a TrinidadUploads subdirectory of /tmp -->
<param-value>/tmp/TrinidadUploads/</param-value>
</context-param>
<!-- This filter is always required; one of its functions is
file upload. -->
<filter>
<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">
<!-- upload files by lw -->
<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>
<meta http-equiv="keywords" content="enter,your,keywords,here" />
<meta http-equiv="description"
content="A short description of this page." />
<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
<!--<link rel="stylesheet" type="text/css" href="styles.css">-->
<script>
</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>
<meta http-equiv="keywords" content="enter,your,keywords,here" />
<meta http-equiv="description"
content="A short description of this page." />
<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
<!--<link rel="stylesheet" type="text/css" href="styles.css">-->
</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。
********************************