JAVA 关于图片上传的代码

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

}

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);
}
}