1. 将页面提交文件上传到服务器目录下面(只能是POST提交方式)
2. 需要引入commons-fileupload.jar
HTML form表单例子如下
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="user.do?op=updateUserImage" id="upfile" method="post" enctype="multipart/form-data">
<input type="hidden" id="fuserid" name="id" value="12334" />
<input type="file" id="newuserimage" name="newuserimage" value="浏览图片" />
<input type="submit" value="tijiao"/>
</form>
</body>
</html>
文件上传，这是一个封装的方法可以直接在自定义Servlet的doPost或者doGet中调用。
package com.xu.utils;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.UUID;
import javax.servlet.ServletException;
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;
@SuppressWarnings(value="all")
public class UploadFile {
private static String fileNmae="";
/**
* 随机文件夹名
* @return
*/
private String randomFilePath(){
SimpleDateFormat format=new SimpleDateFormat("yyyy/MM/dd/HH");
return format.format(new Date()).replace("/", File.separator)+File.separator;
}
/**
* 随机文件名
* @return
*/
private String randomFileName(){
fileNmae= UUID.randomUUID().toString().substring(0,10);
return fileNmae;
}
private String getFileName(String name){
return name.substring(name.lastIndexOf("."));
}
/**
* 单文件上传
* @param request HttpServletRequest
* @param directories 在 Tomcat webapps 下面的存放文件的文件夹的文件夹名
* @return FileBean (JavaBean对象)
* @throws FileUploadException
* @throws IOException
* @throws ServletException
*/
public FileBean singleFileUpload(HttpServletRequest request,String directories) throws FileUploadException, IOException, ServletException{
request.setCharacterEncoding("UTf-8");
String realPath=new File(request.getRealPath("/")).getParent()+File.separator+directories+File.separator+randomFilePath();
randomFileName();//获取随机文件名
String webPath=directories+File.separator+randomFilePath()+fileNmae;
DiskFileItemFactory factory=new DiskFileItemFactory(1024*30,new File(realPath));//创建文件目录
ServletFileUpload fileUpload=new ServletFileUpload(factory);
List<FileItem> list = fileUpload.parseRequest(request);
FileBean bean=new FileBean();
for(FileItem item:list){
if(!item.isFormField()){//说明是文件类型
realPath+=fileNmae+getFileName(item.getName());
webPath+=getFileName(item.getName());
bean.setFileType(item.getContentType());
bean.setFileSize(item.getSize());
bean.setRealPath(realPath);
bean.setWebPath(webPath);
bean.setOriginName(item.getName());
bean.setNewName(fileNmae+getFileName(item.getName()));
InputStream read=item.getInputStream();
OutputStream write=new FileOutputStream(realPath);
byte[] bt = new byte[1024];
int len=0;
while((len=read.read(bt))!=-1){
write.write(bt, 0, len);
}
write.flush();
write.close();
read.close();
item.delete();
break;
}
}
return bean;
}
/**
* 多文件上传
* @param request HttpServletRequest
* @param directories directories 在 Tomcat webapps 下面的存放文件的文件夹的文件夹名
* @return
* @throws FileUploadException
* @throws IOException
*/
public List<FileBean> multiFileUpload(HttpServletRequest request,String directories) throws FileUploadException, IOException{
request.setCharacterEncoding("UTf-8");
String realPath=new File(request.getRealPath("/")).getParent()+File.separator+directories+File.separator+randomFilePath();
String webPath=directories+File.separator+randomFilePath();
DiskFileItemFactory factory=new DiskFileItemFactory(1024*30,new File(realPath));//创建文件目录
ServletFileUpload fileUpload=new ServletFileUpload(factory);
List<FileItem> list = fileUpload.parseRequest(request);
List<FileBean> filelist=new ArrayList<FileBean>();
FileBean bean=null;
for(FileItem item:list){
if(!item.isFormField()){//说明是文件类型
randomFileName();//获取随机文件名
bean=new FileBean();
realPath+=fileNmae+getFileName(item.getName());
webPath+=fileNmae+getFileName(item.getName());
bean.setFileType(item.getContentType());
bean.setFileSize(item.getSize());
bean.setRealPath(realPath);
bean.setWebPath(webPath);
bean.setOriginName(item.getName());
bean.setNewName(fileNmae+getFileName(item.getName()));
InputStream read=item.getInputStream();
OutputStream write=new FileOutputStream(realPath);
byte[] bt = new byte[1024];
int len=0;
while((len=read.read(bt))!=-1){
write.write(bt, 0, len);
}
write.flush();
write.close();
read.close();
item.delete();
filelist.add(bean);
}
}
return filelist;
}
}
文件上传Bean
package com.xu.utils;
import java.io.Serializable;
public class FileBean implements Serializable {
/**
*
*/
private static final long serialVersionUID = 8999004458855350561L;
private String fileType;
private String originName;
private String realPath;
private String webPath;
private String newName;
private Long fileSize;
public String getFileType() {
return fileType;
}
public void setFileType(String fileType) {
this.fileType = fileType;
}
public String getOriginName() {
return originName;
}
public void setOriginName(String originName) {
this.originName = originName;
}
public String getRealPath() {
return realPath;
}
public void setRealPath(String realPath) {
this.realPath = realPath;
}
public String getWebPath() {
return webPath;
}
public void setWebPath(String webPath) {
this.webPath = webPath;
}
public String getNewName() {
return newName;
}
public void setNewName(String newName) {
this.newName = newName;
}
public Long getFileSize() {
return fileSize;
}
public void setFileSize(Long fileSize) {
this.fileSize = fileSize;
}
@Override
public String toString() {
return "FileBean [fileType=" + fileType + ", originName=" + originName + ", realPath=" + realPath
+ ", webPath=" + webPath + ", newName=" + newName + ", fileSize=" + fileSize + "]";
}
}
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