Servlet里怎么接收客户端post上来的二进制数据呢？

俺给你一个上传的源代码，我写的，版权所有，翻印不究：）/*
 * UpLoadServlet.java
 */
package com.jetmail.Tool;import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import com.jetmail.Tool.*;/*
 * 文件上传下载
 * @author cxj
 * @version 1.0.0
 * @date 2002/08/23
 */public class UpLoadServlet extends HttpServlet {
private final int BUFFERSIZE = 1024 * 8;
private final String splitLine = File.separator;
private String tempAttachmentFileName;

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//得到附件的路径
HttpSession session = request.getSession(false);
com.jetmail.User.Session mailSession = (com.jetmail.User.Session)session.getAttribute("mailSession");
com.jetmail.Tool.Config mailConfig = com.jetmail.Tool.Config.getInstance();
//计算能够上传附件的大小
int maxLen = mailConfig.attachMentSize * 1024 * 1024;
String attachmentPath = mailConfig.tempFolder + splitLine;
attachmentPath = attachmentPath + mailSession.getDomain() + splitLine;
attachmentPath = attachmentPath + mailSession.getUserName() + splitLine;
attachmentPath = attachmentPath + mailConfig.attachmentFolder + splitLine;
tempAttachmentFileName = mailSession.getDomain() + '-' + mailSession.getUserName();
//得到附件
ServletOutputStream out = response.getOutputStream();
int contentLen = request.getContentLength();
if(contentLen < maxLen) {
String contentType = request.getContentType();
String boundary = getBoundary(contentType);
ServletInputStream in = request.getInputStream();
FileOutputStream fou = null;
byte[] b = new byte[BUFFERSIZE];
int result;
try {
result = in.readLine(b,0,b.length); //读取boundary
result = in.readLine(b,0,b.length); //读取Content-Disposition
String upLoadFileName = getUpLoadFileName(new String(b,0,result));
fou = new FileOutputStream(attachmentPath + tempAttachmentFileName);
result = in.readLine(b,0,b.length); //读取Content-Type;
result = in.readLine(b,0,b.length); //读取空行;
int totalRead = 0;
result = in.readLine(b,0,b.length);
while((new String(b,0,result)).trim().indexOf(boundary) == -1) {
totalRead += result;
fou.write(b,0,result);
result = in.readLine(b,0,b.length);
}
out.println(totalRead);
fou.close();
in.close();
//处理文件
dealFile(upLoadFileName,totalRead,attachmentPath);
} catch(Exception ex) {
System.out.print(ex.toString());
}
}
response.sendRedirect("/jsp/upload.jsp");
}

public void destroy(){}

/*
 * 得到filename
 */
private String getUpLoadFileName(String line) {
int split = line.indexOf("filename=");
String tempFileName = delQuote(line.substring(split + 9,line.length()).trim());
if(tempFileName.indexOf("\\") != -1) {
tempFileName = tempFileName.substring(tempFileName.lastIndexOf("\\") + 1,tempFileName.length());
}
return tempFileName;
}

/*
 * 得到分隔符
 */
private String getBoundary(String line) {
return line.substring(line.indexOf("boundary=") + 9,line.length()).trim();
}

/*
 * 去除""
 */
private String delQuote(String line) {
if(line.indexOf("\"") != -1) {
line = line.substring(1,(line.length() - 1));
}
return line;
}

/*
 * 处理文件，把最后的两个字节删除
 */
private void dealFile(String fileName, int totalRead, String attachmentPath) throws IOException {
File file = new File(attachmentPath + tempAttachmentFileName);
byte[] b = new byte[totalRead - 2];
RandomAccessFile rafRead = new RandomAccessFile(file,"r");
rafRead.readFully(b,0,totalRead - 2);
rafRead.close();
file.delete();
RandomAccessFile rafWrite = new RandomAccessFile(attachmentPath + fileName,"rw");
rafWrite.write(b);
rafWrite.close();
}}