大附件下载java.io.IOException: 拒绝访问。

[A_S478]

写在Servlet服务器的代码
System.out.println("开始下载");
// InputStream stream=request.getInputStream(); //锟斤拷取锟酵伙拷锟剿达拷锟酵癸拷4锟斤拷锟斤拷
// String string=getReadToString(stream);
System.out.println("stream="+string);
JSONObject json=JSONObject.fromObject(string);
InputStreamReader inputStreamReader =null;
RandomAccessFile random = null;
FileChannel channel = null;
byte[] bytes=null;
BufferedOutputStream outStream = null;
ServletOutputStream sos = null;
try {
//参数设值
int startsSize=json.getInt("startPosition");
int outSize=json.getInt("endPosition");
String filepath=json.getString("downFileDir");

StringBuffer buffer=null;

random = new RandomAccessFile(filepath,"r");
channel = random.getChannel();
long fileSize = random.length(); //锟侥硷拷锟斤拷小
//response.setContentType("application/pdf");
filepath = new String(filepath.getBytes("gb2312"), "ISO8859-1");
//设返回文件大小
response.setContentLength((int) fileSize);
bytes= new byte[(int)(outSize-startsSize)];
MappedByteBuffer out =channel.map(MapMode.READ_ONLY,(startsSize),(outSize));
out.get(bytes);
clean(out);//清空MappedByteBuffer句柄
System.out.println(out+"out");
//向客户端输出流
outStream = new BufferedOutputStream(response.getOutputStream());
outStream.write(bytes,0,bytes.length);
outStream.flush();
outStream.close();
writeJson(response, new String(bytes));
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if( channel != null){
channel.close();
}
if (random != null) {
random.close();
}
if (inputStreamReader != null) {
inputStreamReader.close();
}
if( outStream != null ) outStream.close();

if(sos != null) sos.close();

} catch (Exception e) {
e.printStackTrace();
}
}

[A_S478]

[A_S478]

出错行是：MappedByteBuffer out =channel.map(MapMode.READ_ONLY,(startsSize),(outSize)); 求大神指点

[A_S478]

太凄凉了吧，灌个水的都没有

[Kimihiro_233]

虽然看不懂，帮顶

[vision2000]

文件是否有权限读取？

[一起做过的_项目]

你每次读取的大小设置成了多少？

[yzsunlight]

小文件 有没试过 有没问题！

[wapigzhu]

应该不是权限问题，权限问题的话 random = new RandomAccessFile(filepath,"r"); 这句就该报错了 试了下 MappedByteBuffer out =channel.map(MapMode.READ_ONLY,(startsSize),(outSize)); 如果startsSize + outSize > fileSize了 倒是会报拒绝访问，你可以检查下这3个参数看

[A_S478]

引用 8 楼 wapigzhu 的回复:

应该不是权限问题，权限问题的话 random = new RandomAccessFile(filepath,"r"); 这句就该报错了 试了下 MappedByteBuffer out =channel.map(MapMode.READ_ONLY,(startsSize),(outSize)); 如果startsSize + outSize > fileSize了 倒是会报拒绝访……

果然是因为这个问题，参数理解错了，惭愧…… 谢谢了