[Gordon] first checkin

Author: songguoqiang

README.md

@@ -0,0 +1 @@
+# express-playground

express_router_example.js

@@ -0,0 +1,11 @@
+const express = require("express");
+const app = express();
+const bookRouter = require("./routes/books");
+const userRouter = require("./routes/users");
+
+app.use("/books", bookRouter);
+app.use("/users", userRouter);
+
+const server = app.listen(3000, function() {
+  console.log("Application started....");
+});

helloworld.js

@@ -0,0 +1,18 @@
+const express = require("express");
+const app = express();
+
+app.get("/", function(req, res) {
+  res.send("Hello World!");
+});
+
+app.post("/", function(req, res) {
+  res.send("Got a POST request");
+});
+
+app.put("/", function(req, res) {
+  res.send("Got a PUT request");
+});
+
+const server = app.listen(3000, function() {
+  console.log("Application started....");
+});

package.json

@@ -16,5 +16,8 @@
   },
   "main": "app.js",
   "author": "gordon <[email protected]>",
-  "license": "MIT"
+  "license": "MIT",
+  "devDependencies": {
+    "nodemon": "^1.14.12"
+  }
 }

route_example_1.js

@@ -0,0 +1,14 @@
+const express = require("express");
+const app = express();
+
+app.get("/students", function(req, res) {
+  res.send("Here is a list of students:....");
+});
+
+app.get("/books", function(req, res) {
+  res.send("Here is a list of books:....");
+});
+
+const server = app.listen(3000, function() {
+  console.log("Application started....");
+});

route_example_2.js

@@ -0,0 +1,19 @@
+const express = require("express");
+const app = express();
+
+function requestHandler1(req, res, next) {
+  res.write("Here is a list of students:\n");
+  next();
+}
+
+function requestHandler2(req, res, next) {
+    res.write("Gordon\n");
+    res.write("David\n");
+    res.end();
+}
+
+app.get("/students", requestHandler1, requestHandler2);
+
+const server = app.listen(3000, function() {
+  console.log("Application started....");
+});

route_parameter_example_1.js

@@ -0,0 +1,10 @@
+const express = require("express");
+const app = express();
+
+app.get("/users/:userId/books/:bookId", function(req, res) {
+  res.send(req.params);
+});
+
+const server = app.listen(3000, function() {
+  console.log("Application started....");
+});

route_parameter_example_2.js

@@ -0,0 +1,23 @@
+const express = require("express");
+const app = express();
+
+app.param("userId", function(req, res, next, userId) {
+    // do whatever you like with the userId, e.g. looking up the user profile in database
+    const userName = "Tom";
+    const user = {userId, userName}
+
+    // and you can set new information in the request object
+    req.user = user;
+
+    // now let the next handler to process the request
+    next();
+});
+
+app.get("/users/:userId/books/:bookId", function(req, res) {
+  const user = req.user;
+  res.send("Got the request for user " + user.userName);
+});
+
+const server = app.listen(3000, function() {
+  console.log("Application started....");
+});

routes/books.js

@@ -0,0 +1,14 @@
+const express = require('express');
+const router = express.Router();
+
+/* GET books listing. */
+router.get('/', function(req, res, next) {
+  res.send('You requested a list of books....');
+});
+
+/* GET a specific book with ID */
+router.get('/:bookId', function(req, res, next) {
+  res.send(`You request information on book ${req.params.bookId}`);
+});
+
+module.exports = router;

routes/index.js

@@ -1,9 +1,14 @@
-var express = require('express');
-var router = express.Router();
+const express = require('express');
+const router = express.Router();
 
 /* GET users listing. */
 router.get('/', function(req, res, next) {
-  res.send('respond with a resource');
+  res.send('You requested a list of users....');
+});
+
+/* GET a specific user with ID */
+router.get('/:userId', function(req, res, next) {
+  res.send(`You request information on user ${req.params.userId}`);
 });
 
 module.exports = router;