用ISO－8859-1
public class file {
/*
* 文件名、类型、上传文件字节始终点
*/
public class info{
int x,y;
String nm,ex,type;
info(int x,int y,String type,String nm,String ex)
{
this.x=x;
this.y=y;
//this.path=path;
this.nm=nm;
this.ex=ex;
this.type=type;
}
}
//public void upload(HttpServletRequest q,String path,String nm) throws IOException
public void upload(HttpServletRequest q,String path) throws IOException
{
//多文件上传
byte[] b=this.getBytes(q);
this.put(q,b,path);
//this.toFile(b,fp,finfo);//移入put主要是为了避免多次循环
// this.getString(fp);
}
/*
* 从传入的request对象获取并返回上传文件字节数组
*/
public byte[] getBytes(HttpServletRequest q) throws IOException
{
//1、获取上传文件的字节数组
ServletInputStream stm=q.getInputStream();
int len=q.getContentLength(),
n=0;
byte[] b=new byte[len];
while(n<len)
{
n+=stm.read(b,n,len);
}
stm.close();
return b;
}
/*
* 获取上传文件名称、类型，和文件在字节串中的始、终点,并保存
* path:全路径，使用原上传文件名
*/
//public info[] getInfo(HttpServletRequest q,byte[] b,String path) throws IOException
public void put(HttpServletRequest q,byte[] b,String path) throws IOException
{
info[] fa=null;
String ec="ISO-8859-1",
bs=new String(b,ec),
rc=q.getContentType(),
boundary=rc.substring(rc.lastIndexOf("=")+1, rc.length()),//分界线文字
l = "\r\n", //换行符
pf = "--";
//各参数之间分隔符为："--" + boundary
String[] fs=bs.split(pf+boundary);
int len=fs.length;
System.out.println("fs.length:"+len+boundary);
//StringBuilder sb=new StringBuilder("\nfs:\n");
if(len>2){
fa=new info[len-2];
for(int i=1;i<len-1;i++)//String f :fs
{
String f=fs[i];
int ns=f.indexOf("filename=\"");
if(ns>0)
{
//System.out.println(f);
String sn=f.substring(ns+10),
nm=sn.substring(sn.lastIndexOf("\\",sn.indexOf("\""))+1, sn.indexOf("\"")),//filename返回值有可能是全路径，如IE
ex=nm.substring(nm.indexOf(".")+1);//扩展名
int ci=f.indexOf("Content-Type:"),
bi=f.indexOf("\n",ci)+1;
bi=f.indexOf("\n",bi)+1;
String type=f.substring(ci+13, f.indexOf("\r",ci)).trim();//类型名
//取文件在字节流中的位置索引,加4减2是因为有换行符
int x=f.substring(0,bi).getBytes(ec).length,//x位置错误(bs.length()-st.length())+
y=f.getBytes(ec).length-2;//y的值超出了b.lenth上传图片报错:java.lang.IndexOutOfBoundsException
this.toFile(f.getBytes(ec),path+nm,new info(x,y,type,nm,ex));
}
}
}
//return fa;
}
/*
* 可指定文件名
*/
public void put(HttpServletRequest q,byte[] b,String path,String nm) throws IOException
{
this.put(q, b, path+nm);
}
/*
* 将传入字节数组保存到文件
*/
public void toFile(byte[] b,String path,info o) throws IOException
{
//path=q.getServletContext().getRealPath("/WebContent/upload/").replace("deploy\\", "");//deploy目录是设置的布署目录
//3、保存从字节流到文件
FileOutputStream f=new FileOutputStream(path);
//f.write(b);
//f.write(b);
try{
f.write(b,o.x,o.y-o.x);
}
finally{
f.flush();
f.close();
}
}
