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node.js学习-在页面上传图片并显示例子

2013-05-01 19:47 651 查看

1、服务器启动js， index.js源码:

var server = require("./server");
var router = require("./router");
var requestHandlers = require("./requestHandler");

var handle = {};
handle["/"] = requestHandlers.start;
handle["/start"] = requestHandlers.start;
handle["/upload"] = requestHandlers.upload;
handle["/show"] = requestHandlers.show;

server.start(router.route, handle);

2、服务器server.js:

var http= require("http");
var url = require("url");
function start(route, handle){
function onRequest(request, response){
var pathname = url.parse(request.url).pathname;
console.log("Request for " + pathname + " received.");
route(handle, pathname, response, request);

}

http.createServer(onRequest).listen(8888);
console.log("Server has started.");

}

exports.start = start;

3、路由选择route.js

function route(handle,pathname,response, request){
console.log("About to route a request for " + pathname);
if(typeof handle[pathname] == 'function'){
return handle[pathname](response, request);
}else{
console.log("No request handler found for " + pathname);
//return "404 Not Found!";
response.writeHead(404, {"Content-Type":"text/plain"});
response.write("404 Not found");
response.end();
}
}

exports.route = route;

4、请求处理程序requestHandler.js(使用node-formidable外部模块来处理文件上传，注意：要在index.js文件所在位置增加tmp文件夹，用于存放上传的图片)

var exec = require("child_process").exec;
var fs = require("fs");
var formidable = require("formidable");
function start(response, postData){
console.log("Request handler 'start' was called.");
var body = '<html>' +
'<head>' +
'<meta http-equiv="Content-Type" content = "text/html;charset=UTF-8"/>' +
'</head>' +
'<body>' +
'<form action="/upload" method="post" enctype="multipart/form-data" >' +
'<textarea name="text" rows="20" cols="60"></textarea>' +
'<textarea name="text2" rows="20" cols="60"></textarea>' +
'<input type="file" name="upload" multiple="multiple">' +
'<input type="submit" value="Upload File"/>' +
'</form>' +
'</body>' +
'</html>';
response.writeHead(200, {"Content-Type":"text/html"});
response.write(body);
response.end();
}

function upload(response, request){
console.log("Request handler 'upload' was called");
//return "Hello Upload";
var form = new formidable.IncomingForm();
form.uploadDir = "./tmp";
console.log("about to parse");
form.parse(request, function(error, fields, files){
console.log("parsing done" + files.upload.path);
fs.renameSync(files.upload.path, "/tmp/test.png");
response.writeHead(200, {"Content-Type":"text/html"});
response.write('<head><meta charset="utf-8"/></head>');
response.write("<img src='/show'/>");
response.end();
});

}

function show(response, postData){
console.log("Request handler 'show' was called.");
fs.readFile('/tmp/test.png', "binary", function(error, file){
if(error){
console.log("Request handler 'show' error:" + error);
response.writeHead(500, {"Content-Type":"text/plain"});
response.write(error + "\n");
response.end();
}else{
response.writeHead(200, {"Content-Type":"image/png"});
response.write(file, "binary");
response.end();
}
});
}

exports.start = start;
exports.upload = upload;
exports.show = show;

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