13518219792
我有一段上传图片的代码，并且可以根据实际，按月或按天等，生成存放图片的文件夹
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首先在JSP上放一个FILE的标签这些我都不说了，你也一定明白，我直接把处理过程给你发过去
我把其中存到数据库中的内容删除了，你改一下就能用
/**
*
* 上传图片
* @param servlet
* @param request
* @param response
* @return
* @throws Exception
*/
//这里我是同步上传的，你随意
public synchronized String importPic(HttpServlet servlet, HttpServletRequest request,HttpServletResponse response) throws Exception {
SimpleDate()Format formatDate() = new SimpleDate()Format("yyyyMM");
Date nowtime=new Date();
String formatnowtime=formatDate.format(nowtime);
File root = new File(request.getRealPath("/")+"uploadfile/images/"+formatnowtime+"/"); //应保证在根目录中有此目录的存在 如果没有，下面则上创建新的文件夹
if(!root.isDirectory())
{
System.out.println("创建新文件夹成功"+formatnowtime);
root.mkdir();
}
int returnflag = 0;
SmartUpload mySmartUpload =new SmartUpload();
int file_size_max=1024000;
String ext="";
String url="uploadfile/images/"+formatnowtime+"/";
// 只允许上载此类文件
try{
// 初始化
mySmartUpload.initialize(servlet.getServletConfig(),request,response);
mySmartUpload.setAllowedFilesList("jpg,gif,bmp,jpeg,png,JPG");
// 上载文件
mySmartUpload.upload();
} catch (Exception e){
response.sendRedirect()//返回页面
}
com.jspsmart.upload.File myFile = mySmartUpload.getFiles().getFile(0);
if (myFile.isMissing()){ //没有选择图片做提示！
returnflag = 3;
}else{
String myFileName=myFile.getFileName(); //取得上载的文件的文件名
ext= myFile.getFileExt(); //取得后缀名
if(ext.equals("jpg")||ext.equals("gif")||ext.equals("bmp")||ext.equals("jpeg")||ext.equals("png")||ext.equals("JPG")){ //jpeg,png不能上传!)
int file_size=myFile.getSize(); //取得文件的大小
String saveurl="";
if(file_sizefile_size_max){
try{
//我上面说到，把操作数据库的代友删除了，这里就应该是判断，你的图片是不是已经存在了，存在要怎么处理，不存在要怎么处了，就是你的事了 }
//更改文件名，取得当前上传时间的毫秒数值
Calendar calendar = Calendar.getInstance();
//String filename = String.valueOf(calendar.getTimeInMillis());
String did = contractBean.getMaxSeq("MULTIMEDIA_SEQ");
String filename = did;
String flag = "0";
String path = request.getRealPath("/")+url;
String ename = myFile.getFileExt();
//.toLowerCase()转换大小写
saveurl=request.getRealPath("/")+url;
saveurl+=filename+"."+ext; //保存路径
myFile.saveAs(saveurl,mySmartUpload.SAVE_PHYSICAL);
//将图片信息插入到数据库中
// ------上传完成，开始生成缩略图-----
java.io.File file = new java.io.File(saveurl); //读入刚才上传的文件
String newurl=request.getRealPath("/")+url+filename+"_min."+ext; //新的缩略图保存地址
Image src = javax.imageio.ImageIO.read(file); //构造Image对象
float tagsize=200;
int old_w=src.getWidth(null);
int old_h=src.getHeight(null);
int new_w=0;
int new_h=0;
int tempsize;
float tempdouble;
if(old_wold_h){
tempdouble=old_w/tagsize;
}else{
tempdouble=old_h/tagsize;
}
// new_w=Math.round(old_w/tempdouble);
// new_h=Math.round(old_h/tempdouble);//计算新图长宽
new_w=150;
new_h=110;//计算新图长宽
BufferedImage tag = new BufferedImage(new_w,new_h,BufferedImage.TYPE_INT_RGB);
tag.getGraphics().drawImage(src,0,0,new_w,new_h,null); //绘制缩小后的图
FileOutputStream newimage=new FileOutputStream(newurl); //输出到文件流
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(newimage);
encoder.encode(tag); //近JPEG编码
newimage.close();
returnflag = 1;
}else{
returnflag = 0;
System.out.println("('上传文件大小不能超过"+(file_size_max/1000)+"K');");
}
}else{
returnflag = 2;
}
}
response.sendRedirect();
return "11";
}
package com;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.*;
import com.jspsmart.upload.*;
public class uploadfiles extends HttpServlet
{
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException
{
//使用了一个第三方的组件，存放在web-inf/lib下
response.setContentType("text/html;charset=GB2312");
//由于SmartUpload的初始化方法需要pageContext,所以我们在servlet中得到他
//为了得到pageConext要首先得到JspFactory的实例
//通过JspFactory的实例的getPageContext方法得到pageConext的实例
JspFactory jf = null;
//得到JspFactory的实例
jf=JspFactory.getDefaultFactory();
/*
getPageContext(Servlet servlet,
ServletRequest request,
ServletResponse response,
java.lang.String errorPageURL,
boolean needsSession,
int buffer,
boolean autoflush)
*/
PageContext pageContext=jf.getPageContext(this,request,response,null,true,8192,true);
try
{
//实例化SmartUpload
SmartUpload mySmartUpload=new SmartUpload();
//初始化SmartUpload的实例，需要PageContext的实例
mySmartUpload.initialize(pageContext);
//设定最大上传的字节数，其实可以不进行设定，表示上传的文件没有大小限制
//mySmartUpload.setTotalMaxFileSize(10000000);
mySmartUpload.upload();
//下面是单文件上传
//上传的文件以com.jspsmart.upload.File 代表，如果文件名称重复，则进行覆盖
com.jspsmart.upload.File file=mySmartUpload.getFiles().getFile(0);
String upLoadFileName=file.getFileName();
//调用com.jspsmart.upload.File实例的saveas的方法保存文件，此时的文件名即是
//保存到服务器上的文件名
file.saveAs("/upload/"+upLoadFileName);
Request req =
Text t = .....;
t.setUpload(upLoadFileName);
t.set.....(req);
}
catch(SmartUploadException e)
{
System.out.println(e.getMessage());
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException
{
doGet(request,response);
}
}
private File file;
private String fileFileName;
private String picture;
//都有getter 和 setter
InputStream is = new FileInputStream(file);
//引入一个IO流的输入流
String root = ServletActionContext.getRequest()
.getRealPath("/bookpicture");
//通过REQUEST来得到相对地址，并在后面加上/bookpicture
File f = new File(root, this.getFileFileName());
//定义一个FILE文件，第一个参数是文件的路径，第二个是文件的名字
picture="."+"\\"+"bookpicture"+"\\"+this.getFileFileName();
//为PICTURE字符串赋值，/地址/文件名
System.out.println
("======picture====="+picture);
//从控制台输出Picture
OutputStream os = new FileOutputStream(f);
//第一个文件的输出流
byte[] buffer = new byte[1024];
//定义一个bufer的字符串，长度为1024
int len = 0;
while ((len = is.read(buffer)) 0) {
//如果从制定文件中读取到的信息为结束就继续循环
os.write(buffer, 0, len);
//将文件读出的内容写入到指定的文件中
}
使用一些已有的组件帮助我们实现这种上传功能。常用的上传组件：Apache的CommonsFileUploadJavaZoom的UploadBeanjspSmartUpload以下，以FileUpload为例讲解1、在jsp端要注意enctype="multipart/form-data"然后只需要放置一个file控件，并执行submit操作即可2、web端核心代码如下：publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{request.setCharacterEncoding("UTF-8");DiskFileItemFactoryfactory=newDiskFileItemFactory();ServletFileUploadupload=newServletFileUpload(factory);try{Listitems=upload.parseRequest(request);Iteratoritr=items.iterator();while(itr.hasNext()){FileItemitem=(FileItem)itr.next();if(item.isFormField()){System.out.println("表单参数名:"+item.getFieldName()+"，表单参数值:"+item.getString("UTF-8"));}else{if(item.getName()!=null!item.getName().equals("")){System.out.println("上传文件的大小:"+item.getSize());System.out.println("上传文件的类型:"+item.getContentType());System.out.println("上传文件的名称:"+item.getName());FiletempFile=newFile(item.getName());Filefile=newFile(sc.getRealPath("/")+savePath,tempFile.getName());item.write(file);request.setAttribute("upload.message","上传文件成功！");}else{request.setAttribute("upload.message","没有选择上传文件！");}}}}catch(FileUploadExceptione){e.printStackTrace();}catch(Exceptione){e.printStackTrace();request.setAttribute("upload.message","上传文件失败！");}request.getRequestDispatcher("/uploadResult.jsp").forward(request,response);}
下面这是servlet的内容：
package demo;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.ProgressListener;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class DemoServlet extends HttpServlet {
private static final String UPLOAD_DIRECTORY = "upload";
private static final int MEMORY_THRESHOLD = 1024 * 1024 * 3; // 3MB
private static final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB
private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
DiskFileItemFactory factory=new DiskFileItemFactory();
ServletFileUpload sfu=new ServletFileUpload(factory);
sfu.setHeaderEncoding("UTF-8");
sfu.setProgressListener(new ProgressListener() {
public void update(long pBytesRead, long pContentLength, int pItems) {
System.out.println("文件大小为："+pContentLength+",当前已处理："+pBytesRead);
}
});
//判断提交上来的数据是否是上传表单的数据
if(!ServletFileUpload.isMultipartContent(request)){
PrintWriter writer= response.getWriter();
writer.println("Error:表单必须包含 enctype=multipart/form-data");
writer.flush();
return;
}
factory.setSizeThreshold(MEMORY_THRESHOLD);
//设置临时储存目录
factory.setRepository(new File(System.getProperty("java.io.tmpdir")));
//设置最大文件上传值
sfu.setFileSizeMax(MAX_FILE_SIZE);
//设置最大请求值（包含文件和表单数据）
sfu.setSizeMax(MAX_REQUEST_SIZE);
String uploadpath=getServletContext().getRealPath("./")+ File.separator+UPLOAD_DIRECTORY;
File file=new File(uploadpath);
if(!file.exists()){
file.mkdir();
}
try {
ListFileItem formItems = sfu.parseRequest(request);
if(formItems!=nullformItems.size()0){
for(FileItem item:formItems){
if(!item.isFormField()){
String fileName=new File(item.getName()).getName();
String filePath=uploadpath+File.separator+fileName;
File storeFile=new File(filePath);
System.out.println(filePath);
item.write(storeFile);
request.setAttribute("message", "文件上传成功！");
}
}
}
} catch (Exception e) {
request.setAttribute("message", "错误信息："+e.getMessage());
}
getServletContext().getRequestDispatcher("/demo.jsp").forward(request, response);
}
}
下面是jsp的内容，jsp放到webapp下，如果想放到WEB-INF下就把servlet里转发的路径改一下：
%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%
!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" ""
html
head
meta http-equiv="Content-Type" content="text/html; charset=UTF-8"
titleInsert title here/title
/head
body
form action="demo.do" enctype="multipart/form-data" method="post"
input type="file" name="file1" /
%
String message = (String) request.getAttribute("message");
%
%=message%
input type="submit" value="提交"/
/form
/body
/html
这段代码可以实现普通的文件上传，有大小限制，上传普通的图片肯定没问题，别的一些小的文件也能传
