Question

我正在创建一个节点服务器，根据请求生成一个java进程，我想动态地将java输出传递给客户端，例如在浏览器上显示实时日志记录。

为此，我想使用＆＃39; socket.emit＆＃39;在＆＃39; java.stdout / err.on＆＃39;中，使用以下代码结构，但是＆＃39; socket＆＃39;在java块中未定义：

function javaSTI(userid, email, targetUrl, parserclass, selectedTableIndex, socket, fn){   
   var spawn = require('child_process').spawn;
   var java = spawn('java', ['-cp', STI_LIB, STI_MAIN_CLASS, userid, email, targetUrl, STI_OUTPUT_FOLDER, parserclass, selectedTableIndex, STI_PROPERTY]);

   var error='';   
   //### this line generates error1
   socket.emit('java_sti',{msg:'ok'});

   java.stdout.on('data', function(data){          
      var txt=replaceAll('\n',data.toString(),'<br/>')+'<br/>';
      //### this line generates error2 (if the above line causing error is commented)
      socket.emit('sti_info', {msg:txt});
   });

   java.stderr.on('data', function(data){
      var txt=replaceAll('\n',data.toString(),'<br/>')+'<br/>';
      socket.emit('sti_err', {msg:txt});
   });

   var result;
   java.on('close', function(code){
      var returnWebpage=subfolder+'/'+STI_ERROR_PAGE;
      console.log('java process exited with code %s', code);
      socket.emit('sti_complete', {msg:'file to display'});
      fn(userid);
   });

}

io.of('/').on('connection', function(socket){
    socket.on('java_sti', function(data){
       //### this line is fine
       socket.emit('java_sti',{msg:'ok'});
       //spawn the sti java process, and pass the socket object ('this')
       javaSTI(localUserId,data.url, data.tableparserClass, data.tableIndexes, this, onSTIComplete);

  });
}

ERROR1 ：

Missing error handler on `socket`.
socket.js:404 TypeError: undefined is not a function
    at javaSTI (startserver.js:126:11)
    at Socket.<anonymous> (startserver.js:197:4)
    at Socket.emit (events.js:107:17)
    at Socket.onevent (/node_modules/socket.io/lib/socket.js:335:8)
    at Socket.onpacket (/node_modules/socket.io/lib/socket.js:295:12)
    at Client.ondecoded (/node_modules/socket.io/lib/client.js:193:14)
    at Decoder.Emitter.emit (/node_modules/socket.io/node_modules/socket.io-parser/node_modules/component-emitter/index.js:134:20)
    at Decoder.add (/node_modules/socket.io/node_modules/socket.io-parser/index.js:247:12)
    at Client.ondata (/node_modules/socket.io/lib/client.js:175:18)
    at Socket.emit (events.js:107:17)

erro2

startserver.js:130
      socket.emit('sti_info', {msg:txt});
             ^
TypeError: undefined is not a function
    at Socket.<anonymous> (startserver.js:130:14)
    at Socket.emit (events.js:107:17)
    at readableAddChunk (_stream_readable.js:163:16)
    at Socket.Readable.push (_stream_readable.js:126:10)
    at Pipe.onread (net.js:538:20)

无论如何我可以解决它吗？

由于

编辑：刚刚按要求添加了该功能的完整代码

Answer 1

也许问题在这里？

child.stdout

表示子进程stdout的可读流。如果   如果stdio[1]设置为'pipe'以外的任何其他内容，则会生成该子项，   然后这将是未定义

Answer 2

你的函数需要7个参数：

function javaSTI(userid, email, targetUrl, parserclass, selectedTableIndex, socket, fn)
                 1       2      3          4            5                   6       7

你打电话时只传递6个参数：

javaSTI(localUserId,data.url, data.tableparserClass, data.tableIndexes, this, onSTIComplete)
        1           2         3                      4                  5     6

node.js，java.stdout.on和socket，为什么这个变量不可用于java。*。on？

2 个答案: