private static ServletFileUpload upload //文件上传处理类
factory = new DiskFileItemFactory() //获得磁盘文件条目工厂
factory.setRepository(new File(config.getCache())) //创建缓存工厂
factory.setSizeThreshold(1024*1024*2) //设置缓存区的大小
upload = new ServletFileUpload(factory) //高水平的API文件上传处理
upload.setSizeMax(10 * 1024 * 1024) //设置文件上传的最大值
upload.setFileSizeMax(2* 1024 * 1024) //设置文件上传的最大值
List<FileItem>list = upload.parseRequest(request)
for(FileItem item : list){
String fieldName = item.getFieldName() //获取表单的属性名字
String fileName = item.getName() //获取文件名
if(item.isFormField()){ //如果获取的 表单信息是普通的 文本 信息
}else{
File file = new File("d://test.txt")
item.write(file)
}
}
在Java中可以用struts2实现多个文件同时上传代码,功能代码如下:
1、upload.jsp页面(选择上传文件)
<form action="upload.action" name="uploadForm" method="post" enctype="multipart/form-data">文件标题:<input type="text" name="title"/><br/>
选择文件-:<input type="file" name="upload"/><br/>
选择文件二:<input type="file" name="upload"/><br/>
选择文件三:<input type="file" name="upload"/><br/>
<input type="submit" value="upload"/>
</form>
2、action代码如下:
//对应的Action依次遍历所有文件域,然后生成对应的输入文件流,输出文件流在指定的服务器保存路径中添加对应的输出文件流保存文件。同时动态指定服务器上文件的保存路径。package com.inspur.action
import java.io.File
import java.io.FileInputStream
import java.io.FileOutputStream
import org.apache.struts2.ServletActionContext
import com.opensymphony.xwork2.ActionSupport
public class UploadAction extends ActionSupport {
private String title
private File[] upload
private String[] uploadFileName
private String[] uploadContentType
private String savePath
public String getTitle() {
return title
}
public void setTitle(String title) {
this.title = title
}
public File[] getUpload() {
return upload
}
public void setUpload(File[] upload) {
this.upload = upload
}
public String[] getUploadFileName() {
return uploadFileName
}
public void setUploadFileName(String[] uploadFileName) {
this.uploadFileName = uploadFileName
}
public String[] getUploadContentType() {
return uploadContentType
}
public void setUploadContentType(String[] uploadContentType) {
this.uploadContentType = uploadContentType
}
public String getSavePath() {
return ServletActionContext.getRequest().getRealPath(savePath)
}
public void setSavePath(String savePath) {
this.savePath = savePath
}
public String upload()throws Exception{
File[] files=this.getUpload()
for(int i=0i<files.lengthi++){
FileOutputStream fos=new FileOutputStream(this.getSavePath()+"\\"+this.getUploadFileName()[i])
byte[] buffer=new byte[1024]
FileInputStream fis=new FileInputStream(files[i])
int len=0
while((len=fis.read(buffer))>0){
fos.write(buffer,0,len)
}
}
return SUCCESS
}
}
3、success.jsp页面代码如下(上传成功界面显示所有上传的图片)
文件标题:<s:property value="title"/><br/>第一个图片:<img alt="first" src="<s:property value="'upload/'+uploadFileName[0]"/>"/><br/>
第二个图片:<img alt="second" src="<s:property value="'upload/'+uploadFileName[1]"/>"/><br/>
common-fileupload是jakarta项目组开发的一个功能很强大的上传文件组件
下面先介绍上传文件到服务器(多文件上传):
import javax.servlet.*
import javax.servlet.http.*
import java.io.*
import java.util.*
import java.util.regex.*
import org.apache.commons.fileupload.*
public class upload extends HttpServlet {
private static final String CONTENT_TYPE = "text/htmlcharset=GB2312"
//Process the HTTP Post request
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType(CONTENT_TYPE)
PrintWriter out=response.getWriter()
try {
DiskFileUpload fu = new DiskFileUpload()
// 设置允许用户上传文件大小,单位:字节,这里设为2m
fu.setSizeMax(2*1024*1024)
// 设置最多只允许在内存中存储的数据,单位:字节
fu.setSizeThreshold(4096)
// 设置一旦文件大小超过getSizeThreshold()的值时数据存放在硬盘的目录
fu.setRepositoryPath("c://windows//temp")
//开始读取上传信息
List fileItems = fu.parseRequest(request)
// 依次处理每个上传的文件
Iterator iter = fileItems.iterator()
//正则匹配,过滤路径取文件名
String regExp=".+////(.+)$"
//过滤掉的文件类型
String[] errorType={".exe",".com",".cgi",".asp"}
Pattern p = Pattern.compile(regExp)
while (iter.hasNext()) {
FileItem item = (FileItem)iter.next()
//忽略其他不是文件域的所有表单信息
if (!item.isFormField()) {
String name = item.getName()
long size = item.getSize()
if((name==null||name.equals("")) &&size==0)
continue
Matcher m = p.matcher(name)
boolean result = m.find()
if (result){
for (int temp=0temp<ERRORTYPE.LENGTHTEMP++){
if (m.group(1).endsWith(errorType[temp])){
throw new IOException(name+": wrong type")
}
}
try{
//保存上传的文件到指定的目录
//在下文中上传文件至数据库时,将对这里改写
item.write(new File("d://" + m.group(1)))
out.print(name+" "+size+"")
}
catch(Exception e){
out.println(e)
}
}
else
{
throw new IOException("fail to upload")
}
}
}
}
catch (IOException e){
out.println(e)
}
catch (FileUploadException e){
out.println(e)
}
}
}
现在介绍上传文件到服务器,下面只写出相关代码:
以sql2000为例,表结构如下:
字段名:name filecode
类型: varchar image
数据库插入代码为:PreparedStatement pstmt=conn.prepareStatement("insert into test values(?,?)")
代码如下:
。。。。。。
try{
这段代码如果不去掉,将一同写入到服务器中
//item.write(new File("d://" + m.group(1)))
int byteread=0
//读取输入流,也就是上传的文件内容
InputStream inStream=item.getInputStream()
pstmt.setString(1,m.group(1))
pstmt.setBinaryStream(2,inStream,(int)size)
pstmt.executeUpdate()
inStream.close()
out.println(name+" "+size+" ")
}
。。。。。。
这样就实现了上传文件至数据库
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