com.lone.common.util.UploadUtils Maven / Gradle / Ivy
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package com.lone.common.util;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Random;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import lombok.extern.slf4j.Slf4j;
/**
* 文件上传工具类
*
* @author yangdc
* @date Apr 18, 2012
*
*
*
*/
@Slf4j
public class UploadUtils {
/**
* 表单字段常量
*/
public static final String FORM_FIELDS = "form_fields";
/**
* 文件域常量
*/
public static final String FILE_FIELDS = "file_fields";
// 最大文件大小
private long maxSize = 1000000;
// 定义允许上传的文件扩展名
private Map extMap = new HashMap();
// 文件保存目录相对路径
private String basePath = "upload";
// 文件的目录名
private String dirName = "images";
// 上传临时路径
private static final String TEMP_PATH = "/temp";
private String tempPath = basePath + TEMP_PATH;
// 若不指定则文件名默认为 yyyyMMddHHmmss_xyz
private String fileName;
// 文件保存目录路径
private String savePath;
// 文件保存目录url
private String saveUrl;
// 文件最终的url包括文件名
private String fileUrl;
public UploadUtils() {
// 其中images,flashs,medias,files,对应文件夹名称,对应dirName
// key文件夹名称
// value该文件夹内可以上传文件的后缀名
extMap.put("images", "gif,jpg,jpeg,png,bmp");
extMap.put("flashs", "swf,flv");
extMap.put("medias", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");
extMap.put("files", "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2");
}
/**
* 文件上传
*
* @param request
* @return infos info[0] 验证文件域返回错误信息 info[1] 上传文件错误信息 info[2] savePath info[3] saveUrl info[4] fileUrl
*/
@SuppressWarnings("unchecked")
public String[] uploadFile(HttpServletRequest request) {
String[] infos = new String[5];
// 验证
infos[0] = this.validateFields(request);
// 初始化表单元素
Map fieldsMap = new HashMap();
if (infos[0].equals("true")) {
fieldsMap = this.initFields(request);
}
// 上传
List fiList = (List) fieldsMap.get(UploadUtils.FILE_FIELDS);
if (fiList != null) {
for (FileItem item : fiList) {
infos[1] = this.saveFile(item);
}
infos[2] = savePath;
infos[3] = saveUrl;
infos[4] = fileUrl;
}
return infos;
}
/**
* 上传验证,并初始化文件目录
*
* @param request
*/
private String validateFields(HttpServletRequest request) {
String errorInfo = "true";
// boolean errorFlag = true;
// 获取内容类型
String contentType = request.getContentType();
int contentLength = request.getContentLength();
// 文件保存目录路径
savePath = request.getSession().getServletContext().getRealPath("/") + basePath + "/";
// 文件保存目录URL
saveUrl = request.getContextPath() + "/" + basePath + "/";
File uploadDir = new File(savePath);
if (contentType == null || !contentType.startsWith("multipart")) {
// TODO
log.info("请求不包含multipart/form-data流");
errorInfo = "请求不包含multipart/form-data流";
} else if (maxSize < contentLength) {
// TODO
log.info("上传文件大小超出文件最大大小");
errorInfo = "上传文件大小超出文件最大大小[" + maxSize + "]";
} else if (!ServletFileUpload.isMultipartContent(request)) {
// TODO
errorInfo = "请选择文件";
} else if (!uploadDir.isDirectory()) {// 检查目录
// TODO
errorInfo = "上传目录[" + savePath + "]不存在";
} else if (!uploadDir.canWrite()) {
// TODO
errorInfo = "上传目录[" + savePath + "]没有写权限";
} else if (!extMap.containsKey(dirName)) {
// TODO
errorInfo = "目录名不正确";
} else {
// .../basePath/dirName/
// 创建文件夹
savePath += dirName + "/";
saveUrl += dirName + "/";
File saveDirFile = new File(savePath);
if (!saveDirFile.exists()) {
saveDirFile.mkdirs();
}
// .../basePath/dirName/yyyyMMdd/
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
String ymd = sdf.format(new Date());
savePath += ymd + "/";
saveUrl += ymd + "/";
File dirFile = new File(savePath);
if (!dirFile.exists()) {
dirFile.mkdirs();
}
// 获取上传临时路径
tempPath = request.getSession().getServletContext().getRealPath("/") + tempPath + "/";
File file = new File(tempPath);
if (!file.exists()) {
file.mkdirs();
}
}
return errorInfo;
}
/**
* 处理上传内容
*
* @param request
* @param maxSize
* @return
*/
@SuppressWarnings("unchecked")
private Map initFields(HttpServletRequest request) {
// 存储表单字段和非表单字段
Map map = new HashMap();
// 第一步：判断request
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
// 第二步：解析request
if (isMultipart) {
// Create a factory for disk-based file items
DiskFileItemFactory factory = new DiskFileItemFactory();
// 阀值,超过这个值才会写到临时目录,否则在内存中
factory.setSizeThreshold(1024 * 1024 * 10);
factory.setRepository(new File(tempPath));
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setHeaderEncoding("UTF-8");
// 最大上传限制
upload.setSizeMax(maxSize);
/* FileItem */
List items = null;
// Parse the request
try {
items = upload.parseRequest(request);
} catch (FileUploadException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// 第3步：处理uploaded items
if (items != null && items.size() > 0) {
Iterator iter = items.iterator();
// 文件域对象
List list = new ArrayList();
// 表单字段
Map fields = new HashMap();
while (iter.hasNext()) {
FileItem item = iter.next();
// 处理所有表单元素和文件域表单元素
if (item.isFormField()) { // 表单元素
String name = item.getFieldName();
String value = item.getString();
fields.put(name, value);
} else { // 文件域表单元素
list.add(item);
}
}
map.put(FORM_FIELDS, fields);
map.put(FILE_FIELDS, list);
}
}
return map;
}
/**
* 保存文件
*
* @param obj
* 要上传的文件域
* @param file
* @return
*/
private String saveFile(FileItem item) {
String error = "true";
String fileName = item.getName();
String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
if (item.getSize() > maxSize) { // 检查文件大小
// TODO
error = "上传文件大小超过限制";
} else if (!Arrays. asList(extMap.get(dirName).split(",")).contains(fileExt)) {// 检查扩展名
error = "上传文件扩展名是不允许的扩展名。\n只允许" + extMap.get(dirName) + "格式。";
} else {
String newFileName;
if ("".equals(fileName.trim())) {
SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
newFileName = df.format(new Date()) + "_" + new Random().nextInt(1000) + "." + fileExt;
} else {
newFileName = fileName + "." + fileExt;
}
// .../basePath/dirName/yyyyMMdd/yyyyMMddHHmmss_xxx.xxx
fileUrl = saveUrl + newFileName;
try {
File uploadedFile = new File(savePath, newFileName);
item.write(uploadedFile);
/*
* FileOutputStream fos = new FileOutputStream(uploadFile); // 文件全在内存中 if (item.isInMemory()) { fos.write(item.get()); } else { InputStream is = item.getInputStream(); byte[] buffer =
* new byte[1024]; int len; while ((len = is.read(buffer)) > 0) { fos.write(buffer, 0, len); } is.close(); } fos.close(); item.delete();
*/
} catch (IOException e) {
e.printStackTrace();
log.info("上传失败了！！！");
} catch (Exception e) {
e.printStackTrace();
}
}
return error;
}
/** **********************get/set方法********************************* */
public String getSavePath() {
return savePath;
}
public String getSaveUrl() {
return saveUrl;
}
public long getMaxSize() {
return maxSize;
}
public void setMaxSize(long maxSize) {
this.maxSize = maxSize;
}
public Map getExtMap() {
return extMap;
}
public void setExtMap(Map extMap) {
this.extMap = extMap;
}
public String getBasePath() {
return basePath;
}
public void setBasePath(String basePath) {
this.basePath = basePath;
tempPath = basePath + TEMP_PATH;
}
public String getDirName() {
return dirName;
}
public void setDirName(String dirName) {
this.dirName = dirName;
}
public String getTempPath() {
return tempPath;
}
public void setTempPath(String tempPath) {
this.tempPath = tempPath;
}
public String getFileUrl() {
return fileUrl;
}
public String getFileName() {
return fileName;
}
public void setFileName(String fileName) {
this.fileName = fileName;
}
}