NodeJS res.write doesn't work console works

NodeJS res.write doesn't work console works

本文关键字：work console works res write doesn NodeJS      更新时间：2023-09-26

我试图使用Nodejs来创建一个REST JSON，但当我尝试编写时，它给了我错误，有人可以帮助吗?

var oracle = require ( 'oracle' ) ;
var http = require ( 'http' ) ;
var url = require ('url');
var port = 80 ;
var testarray = []; 
var cnnString = {
   hostname        : 'xxx.xxx.xxx.xxx',
   port            : xxxxx,
   database        : 'xxxxxxxxxx.com' ,
   user            : 'xxxxx' ,
   password        : 'xxxxxx'
} ;

oracle.connect ( cnnString, countrylist ) ;

function countrylist( err, connection ) {
   var reader = connection.reader("select distinct company_code, company_name from mbl_employee_v order by company_code", []);
function doRead(cb) {
reader.nextRow(function(err, row) {
    if (err) return cb(err);
    if (row) {
        // do something with row
        testarray.push(JSON.stringify(row));
        return doRead(cb)
    } else {
        // we are done
        return cb();
    }
})
}
doRead(function(err) {
if (err) throw err; // or log it
console.log("all records processed");
 // console.log(testarray);
});
}

var app  = http.createServer ( cb ) ;
app.listen ( port , function () {
console.log ( 'Http server listening at port : ' + port ) ;
} ) ;
function cb ( req, res ) {  
var QueryVal = url.parse(req.url,true);
res.writeHead ( 200 , { 'Content-Type' : 'application/json' } ) ;
switch ( QueryVal.pathname ) {
    case '/' :
        res.write ( "Hello, World" ) ;
        break ;
    case '/about' :
console.log(testarray); 
res.write (testarray) ;
        break ;

    case '/product' :
    res.write ( 'product' ) ;
        break ;         
    default :
        res.write ( 'unknow' ) ;
        break ;
}
res.end ( '' ) ;
} ;

这里我的console.log显示数据，但是res.write给我错误

http.js: 851抛出new TypeError('第一个参数必须是字符串或Buffer');^ TypeError:第一个参数必须是字符串或Buffer

  • at ServerResponse.OutgoingMessage.write (http.js:851:11)
  • at Server.cb(/opt/Nodejs/ex05-readData01.js:65:7)
  • Server.emit (events.js: 98:17)
  • 在HTTPParser.parser.onIncoming (http.js:2108:12)在HTTPParser
  • 。解析onHeadersComplete [as onHeadersComplete] (http.js:121:23)
  • 设置Socket.socket.ondata (http.js:1966:22)
  • TCP。onread (net.js: 527:27)

这样做

res.write(JSON.stringify(testArray));

代替

res.write(testArray);

因为write函数接受String或Buffer作为参数，而您传递的是数组

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