java上传文件实例

 package com.yc.eap.util;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Calendar;
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.DiskFileUpload;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadBase;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.log4j.Logger;
public class UpLoad {
public static final Logger logger = Logger.getLogger(UpLoad.class);
private HttpServletRequest request = null;
private static int fileSize = 200;
private String filePath;
private Map<String,Object> map = new HashMap<String,Object>();
public UpLoad(HttpServletRequest request){
this.request = request;
}
public void upLoad() throws Exception{
String name = null;
DiskFileUpload fu = new DiskFileUpload();
/**用于设定请求消息中实体内容的最大允许大小，这里设置最大上传文件的大小为200M*/
fu.setSizeMax(fileSize*1024*1024);
/**设置用临时文件来存放临时解析出的数据值，临时数据值的临界值为1M*/
fu.setSizeThreshold(1024*1024);
/**用于存放临时文件的存放目录，必需为绝对路径，如果不设定将存放在Tomcat目录下的temp文件下*/
fu.setRepositoryPath("/temp/upload/");
/**parseRequest(request)方法是DiskFileUpload的重要方法是Http请求的入口，如果请求消息中的实体不是
* "multipart/form-data"，该方法将抛出异常*/
FileUploadBase.isMultipartContent(request);
List filelist = null;
try {
filelist = fu.parseRequest(request);
} catch (FileUploadException e) {
logger.info("消息实体不是multipart/form-data类型"+e.getMessage());
map.put("flag", "false");
}
Iterator i = filelist.listIterator();
while(i.hasNext()){
FileItem fi = (FileItem)i.next();
if(fi.isFormField()){
String fieldName = fi.getFieldName();
String fieldValue = f