jsf结合myfaces实现文件上传

由于上传文件过大会没有错误提示,我已经改写了tomahawk-1.1.6.jar中的org.apache.myfaces.webapp.filter.MultpartRequestWrapper类,添加了对FileUploadBase.SizeLimitExceededException异常处理,使用的jar如下:



upload.jsp

<% ... @ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<% ... @ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<% ... @ taglib uri="http://myfaces.apache.org/tomahawk" prefix="x" %>
  <% ... @page contentType="text/html;charset=gbk" %>  
   < f:view  >
< h:form  id ="MyForm"  enctype ="multipart/form-data"   >
     < h:messages  globalOnly ="true"  styleClass ="message"   />
     < h:panelGrid  columns ="3"  border ="0"  cellspacing ="5" >
         < h:outputLabel  for ="myFileId"  value ="File: " />
         < x:inputFileUpload  id ="myFileId"
            value ="#{myBean.myFile}"
            storage ="file"
            required ="true" />
         < h:message  for ="myFileId"   />
         < h:outputLabel  for ="myParamId"  value ="Param: " />
         < h:selectOneMenu  id ="myParamId"
                value ="#{myBean.myParam}"
                required ="true" >
             < f:selectItem  itemLabel =""  itemValue ="" />
             < f:selectItem  itemLabel ="MD5"  itemValue ="MD5" />
             < f:selectItem  itemLabel ="SHA-1"  itemValue ="SHA-1" />
             < f:selectItem  itemLabel ="SHA-256"  itemValue ="SHA-256" />
             < f:selectItem  itemLabel ="SHA-384"  itemValue ="SHA-384" />
             < f:selectItem  itemLabel ="SHA-512"  itemValue ="SHA-512" />
         </ h:selectOneMenu >
         < h:message  for ="myParamId" />
         < h:outputText  value =" " />
         < h:commandButton  value ="Submit"
            action ="#{myBean.processMyFile}" />
         < h:outputText  value =" " />
     </ h:panelGrid >
</ h:form >
</ f:view >

 
detail.jsp

< %@ taglib  uri ="http://java.sun.com/jsf/core"  prefix ="f" % >
< %@ taglib  uri ="http://java.sun.com/jsf/html"  prefix ="h" % >

< f:view >

     < h:panelGrid  columns ="2"  border ="0"  cellspacing ="5" >

         < h:outputText  value ="FileName:" />
         < h:outputText  value ="#{myBean.myFile.name}" />

         < h:outputText  value ="FileSize:" />
         < h:outputText  value ="#{myBean.myFile.size}" />

         < h:outputText  value ="Param:" />
         < h:outputText  value ="#{myBean.myParam}" />

         < h:outputText  value ="Result:" />
         < h:outputText  value ="#{myBean.myResult}" />

     </ h:panelGrid >

</ f:view >

MyBean.java

import  java.io.BufferedInputStream;
import  java.io.BufferedOutputStream;
import  java.io.File;
import  java.io.FileOutputStream;
import  java.io.InputStream;
import  java.io.OutputStream;
import  java.security.MessageDigest;

import  org.apache.myfaces.custom.fileupload.UploadedFile;

public   class  MyBean ... {
    private UploadedFile myFile;
    private String myParam;    

    public String getMyParam() ...{
        return myParam;
    }

    public void setMyParam(String param) ...{
        this.myParam = param;
    }

    public UploadedFile getMyFile() ...{
        return myFile;
    }

    public void setMyFile(UploadedFile myFile) ...{
        this.myFile = myFile;
    }
    public String processMyFile() ...{
        try ...{
            MessageDigest md
                = MessageDigest.getInstance(myParam);
            InputStream in = new BufferedInputStream(
                myFile.getInputStream());
            File temp=new File("d:/data/",myFile.getName());
            FileOutputStream fos=new FileOutputStream(temp);
            OutputStream out=new BufferedOutputStream(fos);
            
            try ...{
                byte[] buffer = new byte[10*1024*1024];
                int count;
                while ((count = in.read(buffer)) > 0)
                    md.update(buffer, 0, count);
                out.write(buffer);
            } finally ...{
                in.close();
                out.close();
            }
           
            return "OK";
        } catch (Exception x) ...{         
            System.out.println("错误:"+x.getMessage());
            return null;
        }
    }
}

web.xml

<? xml version="1.0" encoding="ISO-8859-1" ?>
< web-app  xmlns ="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation ="http://java.sun.com/xml/ns/j2ee 
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
    version ="2.4" >
     < context-param >
         < param-name > javax.faces.STATE_SAVING_METHOD </ param-name >
         < param-value > client </ param-value >
     </ context-param >

     < servlet >
         < servlet-name > FacesServlet </ servlet-name >
         < servlet-class >
            javax.faces.webapp.FacesServlet
         </ servlet-class >
         < load-on-startup > 1 </ load-on-startup >
     </ servlet >

     < servlet-mapping >
         < servlet-name > FacesServlet </ servlet-name >
         < url-pattern > /faces/* </ url-pattern >
     </ servlet-mapping >

     < servlet-mapping >
         < servlet-name > FacesServlet </ servlet-name >
         < url-pattern > *.faces </ url-pattern >
     </ servlet-mapping >

     < filter >
         < filter-name > ExtensionsFilter </ 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 > 100k </ param-value >
         </ init-param >
     </ filter >

     < filter-mapping >
         < filter-name > ExtensionsFilter </ filter-name >
         < servlet-name > FacesServlet </ servlet-name >
     </ filter-mapping >

     < welcome-file-list >
         < welcome-file > index.jsp </ welcome-file >
     </ welcome-file-list >
</ web-app >

faces-config.xml

<? xml version="1.0" ?>
<! DOCTYPE faces-config PUBLIC
 "-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.0//EN"
 "http://java.sun.com/dtd/web-facesconfig_1_0.dtd" >

< faces-config >
     < navigation-rule >
         < from-view-id > /pages/upload.jsp </ from-view-id >
         < navigation-case >
             < from-outcome > OK </ from-outcome >
             < to-view-id > /pages/detail.jsp </ to-view-id >
         </ navigation-case >
     </ navigation-rule >
     < managed-bean >
         < managed-bean-name > myBean </ managed-bean-name >
         < managed-bean-class > com.ycl.MyBean </ managed-bean-class >
         < managed-bean-scope > session </ managed-bean-scope >
     </ managed-bean >
</ faces-config >

修改部分的MultpartRequestWrappe

try ... {
            requestParameters = fileUpload.parseRequest(request);
        }   catch  (FileUploadBase.SizeLimitExceededException e)  ... {

            // TODO: find a way to notify the user about the fact that the uploaded file exceeded size limit

            if(log.isInfoEnabled())
                log.info("user tried to upload a file that exceeded file-size limitations.",e);

            requestParameters = Collections.EMPTY_LIST;
        FacesMessage message = new FacesMessage(
                FacesMessage.SEVERITY_ERROR,
                "文件超出指定大小","文件超出指定大小");
            FacesContext.getCurrentInstance().addMessage(
                null, message);

        }