fileupload文件上传与表单同时提交的实现

     由于工作原因，碰到file与其他表单同时提交的问题，研究了几天，加上google的帮助，终于成功了。下面就分享一下：

1、提交的表单必须写enctype="multipart/form-data",但是在很多情况下，可能不能确定是不是一定会有文件，这时修改，表单提交前，就是使用javascript动态控制.如下：

   function setEncoding(form){
 //filterForm.encoding="";
 var hasFile = false;
 var inputTags = document.getElementsByTagName("input");
 for(i=0;i<inputTags.length;i++){
  if(inputTags[i].type=="file"){
   form.encoding = "multipart/form-data";
   hasFile = true;
   break;
  }
 }
 return hasFile;
}

 

2、fileuploader.java

package com.neusoft.report.engine.util;

import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class FileUploader {

 private List items;
 private Map params=new HashMap();

 public void parseParams(HttpServletRequest request) {  
  // Create a factory for disk-based file items
  FileItemFactory factory = new DiskFileItemFactory();
  // Create a new file upload handler
  ServletFileUpload upload = new ServletFileUpload(factory);
  
  try {
   items = upload.parseRequest(request);
  } catch (FileUploadException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();//文件解析失败，请确认form中的文件正确并且form的enctype属性为multipart/form-data
  }
  Iterator iter = items.iterator();
  while (iter.hasNext()) {
   FileItem item = (FileItem) iter.next();
   
   if (item.isFormField()) {
    String name = item.getFieldName();
    String value = item.getString();
    System.out.println(name+","+value);
    if(params.containsKey(name)){
     value = ((String)params.get(name))+","+value;
    }
    params.put(name, value);
   }else{
    String name = item.getFieldName();
    byte[] fileBytes = item.get();//把文件解析成字节数组保存，当然也可以上传到临时文件夹。
    params.put(name, fileBytes);
   }
  }
 }
 /*
  * 从params中取
  */
 public String getParameter(String name){
  String value = null;
  if(params.containsKey(name)){
   value = (String)params.get(name);
   if(value==null||value.equalsIgnoreCase("null"))
    value=null;
  }
  return value;
 }
 
 public String[] getParameterValues(String name){
  String[] values = null;
  if(params.containsKey(name)){
   values = ((String)params.get(name)).split(",");
  }
  return values;
 }
 
 public byte[] getFileParameter(String name){
  byte[] fileBytes=null;
  if(params.containsKey(name)){
   fileBytes = (byte[])params.get(name);
  }
  return fileBytes;
 }
 
 /*
  * 如params中没有，从request中取
  */
 public String getParameter(HttpServletRequest request,String name){
  String value = null;
  if(params.containsKey(name)){
   value = (String)params.get(name);
   if(value==null||value.equalsIgnoreCase("null"))
    value=null;
  }else{
   value = request.getParameter(name);
  }
  return value;
 }
   
 public String[] getParameterValues(HttpServletRequest request,String name){
  String[] values = null;
  if(params.containsKey(name)){
   values = ((String)params.get(name)).split(",");   
  }else{
   values = request.getParameterValues(name);
  }
 
  return values;
 }
 
}

 

3、Action中的使用方法：

String hasFile = request.getParameter("hasFile");
  if (hasFile == null) {
   hasFile = "";
  }

  if (hasFile.equalsIgnoreCase("true")) {
   uploader = new FileUploader();
   uploader.parseParams(request);
   String name = uploader.getParameter(request, "name");   
   type = uploader.getParameter(request, "ctype");// 报表结点类型（type=1）还是结果结点类型（type=3）
  } else {
   name = request.getParameter("name");

  }