jsp中 commons-fileupload简单操作类-优快云博客

本文介绍了一个用于处理文件上传的实用工具类，包括从表单中获取单个文件、多个文件及参数的方法。

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package com;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.apache.commons.fileupload.FileItem;

public class CommonsUploadUtils {
    /**
    * 获取表单元素
    * @param fileItems
    * @param name
    * @return
    */
    public static FileItem getFieldParam(List<FileItem> fileItems, String name){
        if(null==name||"".equals(name))return null;
        Iterator<FileItem> iter = fileItems.iterator();
        for( ; iter.hasNext(); ) {
            FileItem fileItem = (FileItem) iter.next();
            if(name.equals(fileItem.getFieldName())&&fileItem.isFormField()){
                return fileItem;
            }
        }
        return null;
    }
    /**
    * 获取表单文件
    * @param fileItems
    * @param name
    * @return
    */
    public static FileItem getFileParam(List<FileItem> fileItems, String name){
        if(null==name||"".equals(name))return null;
        Iterator<FileItem> iter = fileItems.iterator();
        while(iter.hasNext()) {
            FileItem fileItem = (FileItem) iter.next();
            if(name.equals(fileItem.getFieldName())&&null!=fileItem.getName()
                    &&!"".equals(fileItem.getName())){
                return fileItem;
            }
        }
        return null;
    }
    /**
    * 获取表单文件组
    * @param fileItems
    * @param name
    * @return
    */
    public static FileItem[] getFileParams(List<FileItem> fileItems, String name){
        if(null==name||"".equals(name))return null;
        List<FileItem> temp = new ArrayList<FileItem>();
        Iterator<FileItem> iter = fileItems.iterator();
        while(iter.hasNext()) {
            FileItem fileItem = (FileItem) iter.next();
            if(name.equals(fileItem.getFieldName())&&!fileItem.isFormField()){
                temp.add(fileItem);
            }
        }
        return temp.toArray(new FileItem[0]);
    }
    /**
    * 获取值串
    * @param fileItems
    * @param name
    * @param arg
    * @return
    */
    public static String[] getFieldParams(List<FileItem> fileItems, String name){
        if(null==name||"".equals(name))return new String[0];
        List<String> list = new ArrayList<String>();
        Iterator<FileItem> iter = fileItems.iterator();
        while(iter.hasNext()) {
            FileItem fileItem = (FileItem) iter.next();
            if(name.equals(fileItem.getFieldName())&&fileItem.isFormField()){
                list.add(fileItem.getString().trim());
            }
        }
        return list.size()>0?list.toArray(new String[0]):new String[0];
    }
    /**
    * 获取值串
    * @param fileItems
    * @param name
    * @param arg
    * @return
    */
    public static String getFieldParam(List<FileItem> fileItems, String name, String arg){
        if(null==name||"".equals(name))return null;
        Iterator<FileItem> iter = fileItems.iterator();
        while(iter.hasNext()) {
            FileItem fileItem = (FileItem) iter.next();
            if(name.equals(fileItem.getFieldName())&&fileItem.isFormField()){
                return fileItem.getString().trim();
            }
        }
        return arg;
    }
    /**
    * 获取值串
    * @param fileItems
    * @param name
    * @param arg
    * @return
    */
    public static int getIntFieldParam(List<FileItem> fileItems, String name, int arg){
        if(null==name||"".equals(name))return arg;
        Iterator<FileItem> iter = fileItems.iterator();
        while(iter.hasNext()) {
            FileItem fileItem = (FileItem) iter.next();
            if(name.equals(fileItem.getFieldName())&&fileItem.isFormField()){
                return Integer.parseInt(fileItem.getString().trim());
            }
        }
        return arg;
    }

}