Servlet读取前端的request payload

 1 public class UploadSservlet extends HttpServlet{
 2     private static final long serialVersionUID = 1L;
 3     private int[] reqdata;//用来存储初始化后inputstream中读取的数据
 4     private void initInputData(HttpServletRequest req) throws ServletException, IOException{
 5         int a;
 6         InputStream in=req.getInputStream();
 7         BufferedInputStream br=new BufferedInputStream(in);
 8         
 9         int byteslen=req.getContentLength();
10         reqdata=new int[byteslen];
11         
12         for(int i=0;(a=br.read())!=-1;i++){
13             reqdata[i]=a;
14         }
15         br.close();
16         in.close();
17     }
18     private byte[] getPayLoadValue(String name){
19         byte[] retArray;
20         int retArraybeginindex=-1,retArrayendindex=reqdata.length;
21         byte[] namebyte=("name=\""+name+"\"").getBytes();
22         int pipeindex=0;
23         int pipeilen=namebyte.length;
24         char lastchar=‘$‘;
25         char[] lastHeng=new char[6];
26         int lastHengindex=0;
27         boolean begintakeout=false;
28         
29         for(int i=0;i<reqdata.length;i++){
30             if( !begintakeout && reqdata[i]==namebyte[pipeindex] ){
31                 pipeindex++;
32                 if(pipeindex>=pipeilen){
33                     begintakeout=true;
34                 }        
35             }    
36             else
37                 pipeindex=0;
38             if(begintakeout && ((char)reqdata[i])==‘\n‘ && ((char)reqdata[i-2])==‘\n‘){
39                 retArraybeginindex=i+1;//当前位置指向回车，所以+1即为内容区域起始位置
40                 break;
41             }    
42             lastchar=(char)reqdata[i];    
43         }
44         for(int i=retArraybeginindex;i<reqdata.length;i++){
45             if((char)reqdata[i]==‘-‘){
46                 lastHeng[lastHengindex]=(char)reqdata[i];
47                 lastHengindex++;
48             }else{
49                 lastHengindex=0;
50             }
51             if(lastHengindex>=6)
52             {
53                 retArrayendindex=i-6;//i当前指向\n------最后一个-,减6指向\n，小于retArrayendindex意味着结束之前的所有
54                 break;
55             }
56         }
57         retArray=new byte[retArrayendindex-retArraybeginindex];
58         for(int i=retArraybeginindex;i<retArrayendindex;i++){
59             retArray[i-retArraybeginindex]=(byte)reqdata[i];
60         }
61         return retArray;
62         
63     }
64     @Override
65     protected void doGet(HttpServletRequest req, HttpServletResponse resp)
66             throws ServletException, IOException {
67         initInputData(req);
68         byte file[]=getPayLoadValue("uploadFile");//input 里的name是什么就传什么，获取到的byte数组就是对应文件的byte数据
69         byte name[]=getPayLoadValue("name");//input 里的name是什么就传什么，获取input输入框内的值
70         for(byte i :name){
71             System.out.print((char)i);//测试输出一下前端input传来的值
72         }
73     }
74 }