Unity3D与JAVA服务器传递文件之服务器端

public void uploadFile() throws IOException {
        renderNull();        
        //==================开始处理文件===================

        //接收上传文件内容中临时文件的文件名
        System.out.println(getRequest().getContentLength());
        if(getRequest().getContentLength()>0){
        String tempFileName = new String("tempFileName.txt");
        //tempfile 对象指向临时文件        
        File tempFile = new File(PathKit.getWebRootPath() + File.separator+tempFileName);
        System.out.println("FilePath:"+PathKit.getWebRootPath() + File.separator+tempFileName);
        //outputfile 文件输出流指向这个临时文件
        FileOutputStream outputStream = new FileOutputStream(tempFile);
        //得到客户端提交的所有数据       
        InputStream fileSourcel = getRequest().getInputStream();
        
        //将得到的客户端数据写入临时文件
        byte b[] = new byte[1000];
        int n ;
        while ((n=fileSourcel.read(b))!=-1){            
            System.out.println("b:"+b);
            System.out.println("n:"+n);
            outputStream.write(b,0,n);
        }

        //关闭输出流和输入流
        outputStream.close();
        fileSourcel.close();

        //randomFile对象指向临时文件
        RandomAccessFile randomFile = new RandomAccessFile(tempFile,"r");
        //读取临时文件的前三行数据
        randomFile.readLine();
        randomFile.readLine();
        randomFile.readLine();
        //读取临时文件的第四行数据，这行数据中包含了文件的路径和文件名
        String filePath = randomFile.readLine();
        //得到文件名
        System.out.println(filePath);
        int position = filePath.lastIndexOf("filename");
        String filename =Tool.codeString(filePath.substring(position+10,filePath.length()-1));
        System.out.println("filename"+filename);
        //重新定位读取文件指针到文件头
        randomFile.seek(0);
        //得到第五行回车符的位置，这是上传文件数据的开始位置
        long  fifthEnterPosition = 0;
        int fifth = 1;
        while((n=randomFile.readByte())!=-1&& fifth<=5)){
            System.out.println("n:"+n);
            System.out.println( fifth:" fifth);
            if(n==‘\n‘){
             fifthEnterPosition = randomFile.getFilePointer();
             fifth++;
            }
            System.out.println( fifthEnterPosition:" fifthEnterPosition);
        }

        //生成上传文件的目录
        File fileupLoad = new File(PathKit.getWebRootPath() + File.separator,"upLoad");
        fileupLoad.mkdir();
        //saveFile 对象指向要保存的文件
        File saveFile = new File(PathKit.getWebRootPath() +"\\upLoad",filename);
        RandomAccessFile randomAccessFile = new RandomAccessFile(saveFile,"rw");
        //找到上传文件数据的结束位置，即倒数第三行
        randomFile.seek(randomFile.length());
        long endPosition = randomFile.getFilePointer();
        System.out.println("endPosition:"+endPosition);
        int j = 1;
        while((endPosition>=0)&&(j<=3)){
            System.out.println("endPosition1:"+endPosition);
            System.out.println("j:"+j);
            endPosition--;
            randomFile.seek(endPosition);
            if(randomFile.readByte()==‘\n‘){
                j++;
            }
        }

        //从上传文件数据的开始位置到结束位置，把数据写入到要保存的文件中
        System.out.println( fifthEnterPosition:" fifthEnterPosition);
        randomFile.seek fifthEnterPosition);
        long startPoint = randomFile.getFilePointer();
        System.out.println("startPoint:"+startPoint);
        //endPosition=randomFile.getFilePointer();
        System.out.println("endPosition:"+endPosition);
        while(startPoint<endPosition){
             System.out.println("startPoint1:"+startPoint);
            //System.out.println("randomFile.readByte():"+randomFile.readByte());
            randomAccessFile.write(randomFile.readByte());
            
            startPoint = randomFile.getFilePointer();
        }
        //关闭文件输入、输出
        randomAccessFile.close();
        randomFile.close();
        tempFile.delete();
        //==================处理文件结束===================

        //向控制台输出文件上传成功
        System.out.println("File upload success!");
        checkCsv();
        }else{
            renderText("false");
        }
        
    }