int length = request.getContentLength();//獲取請求參數長度。
byte[] bytes = new byte[length];//定義數組，長度為請求參數的長度
DataInputStream dis = new DataInputStream(request.getInputStream);//獲取請求內容，轉成數據輸入流
int readcount = 0;//定義輸入流讀取數
while(readcount < length){
 int aa= dis.read(bytes,readcount,length); //讀取輸入流，放入bytes數組，返回每次讀取的數量
 readcount = aa + readcount; //下一次的讀取開始從readcount開始
}
//讀完之后bytes就是輸入流的字節(jié)數組，將其轉為字符串就能看到
String bb = new String(bytes,"UTF-8");

DataInputStream dis = new DataInputStream(request.getInputStream());
ByteArrayOutputStream baot = new ByteArrayOutputStream();
byte[] bytes = new byte[1024]; //定義一個數組 用來讀取
int n = 0;//每次讀取輸入流的量
while((n=dis.read(bytes))!=-1){
 baot.write(bytes); //將讀取的字節(jié)流寫入字節(jié)輸出流 
}
byte[] outbyte = boat.toByteArray();//將字節(jié)輸出流轉為自己數組。
String bb = new String(outbyte,"UTF-8");

/**
  * 取得圖片數據
  *
  * @param requestData
  * @param contentType
  * @return
  * @throws IOException
  */
 private byte[] getImgData(byte[] requestData, String contentType)
   throws IOException {
  String txtBody = new String(requestData, "GBK");
  if (!txtBody.contains("image/jpg") && !txtBody.contains("image/jpeg")&& !txtBody.contains("jpg")) {
   return null;
  }
  String boundarytext = contentType.substring(
    contentType.lastIndexOf("=") + 1, contentType.length());
  // 取得實際上傳文件的起始與結束位置
  int pos = txtBody.indexOf("filename=\"");
  pos = txtBody.indexOf("\n", pos) + 1;
  pos = txtBody.indexOf("\n", pos) + 1;
  pos = txtBody.indexOf("\n", pos) + 1;
  // 文件描述信息后就文件內容，直到為文件邊界為止，從pos開始找邊界
  int boundaryLoc = txtBody.indexOf(boundarytext, pos) - 4;
  ByteArrayOutputStream realdatas = null;
  try {
   int begin = ((txtBody.substring(0, pos)).getBytes("GBK")).length;
   int end = ((txtBody.substring(begin, boundaryLoc)).getBytes("GBK")).length;
   realdatas = new ByteArrayOutputStream();
   realdatas.write(requestData, begin, end); 
   return realdatas.toByteArray();
  } finally {
   if (null != realdatas) {
    try {
     realdatas.close();
    } catch (IOException e) {
     logger.error("處理上傳圖片數據錯誤：", e);
    }
   }
  }
 }

OutputStream os = response.getOutputStream();
os.write(bytes);