如何使用jsf上传文件

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2010年毕业于北京化工大学北方学院计算机科学与技术专业毕业，学士学位，工程电子技术行业4年从业经验。

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使用jsf加myfaces的upload插件实现上传文件的功能
需要的jar包:tomahawk-1.1.6.jar,jsf-impl.jar,commons-fileupload-1.2.jar,commons-io-1.3.2.jar,commons-el-1.0.jar
程序:
package model.map;
import control.MapMDelegate;
import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import org.apache.myfaces.custom.fileupload.UploadedFile;
public class FileUploadForm {
    public FileUploadForm() {
    }
    private String name;
    private UploadedFile upFile;
    public void setName(String name) {
        this.name = name;
    }
    public String getName() {
        return name;
    }
    public void setUpFile(UploadedFile upFile) {
        this.upFile = upFile;
    }
    public UploadedFile getUpFile() {
        return upFile;
    }

    public String upload() throws IOException {
        try {
            InputStream in = new BufferedInputStream(upFile.getInputStream());
            try {
                
                byte[] buffer = new byte[(int)upFile.getSize()];
                             
                Date now = new Date();
                SimpleDateFormat sdf2 = new SimpleDateFormat("yyyyMMddHHmmss");
                String dt2 = sdf2.format(now);
                                                    
                //取得后缀名
                String name = upFile.getName();
                int l = name.lastIndexOf(".");
                name = name.substring(l);
                //生成2位随机数
                Random random = new Random();
                String sRand="";
                String rand = null;
                for (int count=0;count<2;count++){
                    rand=String.valueOf(random.nextInt(10));
                    sRand+=rand;
                 }
                                                   
                 //生成在服务器端保存的文件名
                 String saveName = dt2 + sRand + name;
                 this.setName(saveName);
                 String trace = D:\\"+ saveName;//本地测试
                 
                FileOutputStream fileOutputStream = 
                    new FileOutputStream(trace); //这里可以把上传的文件写服务器目录，或者数据库中 ，或者赋值给name用于文件名显示
                while (in.read(buffer) > 0) {
                    fileOutputStream.write(buffer);
                }
            } catch (Exception x) {
                System.out.print("Exception");
                FacesMessage message = 
                    new FacesMessage(FacesMessage.SEVERITY_FATAL, 
                                     x.getClass().getName(), x.getMessage());
                FacesContext.getCurrentInstance().addMessage(null, message);
                return null;
            }

            finally {
                in.close();
                FacesContext facesContext = FacesContext.getCurrentInstance();
                facesContext.getExternalContext().getApplicationMap().put("fileupload_bytes", 
                                                                          upFile.getBytes());
                facesContext.getExternalContext().getApplicationMap().put("fileupload_type", 
                                                                          upFile.getContentType());
            }
            System.out.println("End");
            return "OK";
        } catch (Exception x) {
            System.out.print("Exception");
            FacesMessage message = 
                new FacesMessage(FacesMessage.SEVERITY_FATAL, 
                                 x.getClass().getName(), x.getMessage());
            FacesContext.getCurrentInstance().addMessage(null, message);
            return null;
        }

    }
    public boolean isUploaded() {
        FacesContext facesContext = FacesContext.getCurrentInstance();
        return facesContext.getExternalContext().getApplicationMap().get("fileupload_bytes") != 
            null;
    }
}

页面:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%@ page contentType="text/html;charset=GBK"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<%@ taglib uri="http://myfaces.apache.org/tomahawk" prefix="t"%>
<f:view>
  <html>
    <head>
      <meta http-equiv="Content-Type" content="text/html; charset=GB18030"/>
      <title>add-map</title>
    </head>
    <body> 
    <h:outputText value="#{MapMDelegate.msg}" style="color:rgb(255,0,0);"/>    
    <h:form enctype="multipart/form-data">
    <t:inputFileUpload value="#{fileuploadForm.upFile}"/>
<br/>
        <h:message for="fileupload"/><h:commandButton value="上传"
                   action="#{fileuploadForm.upload}" />
     </h:form>
    <h:form>
    <br/>
       图纸名称 <h:inputText value="#{fileuploadForm.name}" disabled="true"/>
                 </h:form>
    </body>
  </html>
</f:view>
记得要在工程的web.xml文件中加入filter
      <!--Tomahawk-->
    <filter>
        <filter-name>extensionsFilter</filter-name>
        <filter-class>org.apache.myfaces.webapp.filter.ExtensionsFilter</filter-class>
        <init-param>
            <description>Set the size limit for uploaded files.
                Format: 10 - 10 bytes
                        10k - 10 KB
                        10m - 10 MB
                        1g - 1 GB</description>
            <param-name>uploadMaxFileSize</param-name>
            <param-value>10m</param-value>
        </init-param>
        <init-param>
            <description>Set the threshold size - files
                    below this limit are stored in memory, files above
                    this limit are stored on disk.
                Format: 10 - 10 bytes
                        10k - 10 KB
                        10m - 10 MB
                        1g - 1 GB</description>
            <param-name>uploadThresholdSize</param-name>
            <param-value>1k</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>extensionsFilter</filter-name>
        <url-pattern>/faces/*</url-pattern>
    </filter-mapping>
  还有把你的程序设置成request哦
<managed-bean>
    <managed-bean-name>fileuploadForm</managed-bean-name>
    <managed-bean-class>model.map.FileUploadForm</managed-bean-class>
    <managed-bean-scope>request</managed-bean-scope>
  </managed-bean>


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