Golang implements photo wall
With the popularity of mobile Internet, people’s demand for photos is increasing. Whether it is an event, travel, or party, taking photos is indispensable. How to display these photos has also become a concern. An application that implements the photo wall function came into being. Today we will introduce the process of implementing the photo wall using golang language.
1. Golang language features
golang is an open source language developed by Google. The main features are as follows:
- Efficiency: Golang’s compilation speed is very fast and has significant advantages compared with C and Java.
- Memory management: Golang’s memory management is automatically completed by the compiler, and programmers do not need to manually manage memory.
- Concurrent programming: golang provides powerful support for concurrent programming, which can better exert application performance in the case of multi-core CPUs or multiple servers.
- Simplicity: The syntax of golang language is concise and easy to understand, allowing programmers to get started faster.
2. Design Ideas
When implementing the photo wall function, we need to consider the following aspects:
- Upload of photos: Users need to be able to When uploading your own photos, you also need to be able to tag the photos for easy classification and display.
- Display of photos: Uploaded photos should be classified and displayed according to tags, and users can select tags to view.
- Database storage: The photo wall needs to store the photo data uploaded by users, and we need to use a database for data storage.
3. Technical implementation
- Environment setup
Before we start, we need to prepare the environment first. We can download the golang installation package from golang's official website. After the installation is complete, enter the following code in the terminal to verify whether the installation is successful:
$ go version
- Database Design
We need Design a database to store pictures uploaded by users, so we need to design a table containing the following fields:
- id (photo id, primary key)
- name (photo name)
- path (photo path, the storage path of the picture on the server)
- tag (tag)
The above fields are the photo information we need to store.
- Upload photos
We need to implement the function of uploading photos on the client so that users can freely upload photos and tag them. First, we need to implement the photo upload function on the front-end page, which can be implemented using the HTML5 File API. The following is a code example:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>照片上传</title>
</head>
<body>
<input type="file" id="file">
<input type="text" id="tag">
<button onclick="upload()">上传</button>
</body>
<script>
function upload() {
var file = document.getElementById("file").files[0];
var tag = document.getElementById("tag").value;
var formData = new FormData();
formData.append("file", file);
formData.append("tag", tag);
var xhr = new XMLHttpRequest();
xhr.open("POST", "/upload", true);
xhr.onload = function () {
if (xhr.readyState == 4 && xhr.status == 200) {
alert("上传成功");
} else {
alert("上传失败");
}
}
xhr.send(formData);
}
</script>
</html>On the server side, we need to use the http package provided by golang to implement the photo upload function. The following is a sample code:
func upload(w http.ResponseWriter, r *http.Request) {
file, handler, err := r.FormFile("file")
if err != nil {
fmt.Println(err)
return
}
defer file.Close()
tag := r.FormValue("tag")
fileName := handler.Filename
f, err := os.OpenFile("./upload/"+fileName, os.O_WRONLY|os.O_CREATE, 0666)
if err != nil {
fmt.Println(err)
return
}
defer f.Close()
io.Copy(f, file)
insertData(fileName, "./upload/"+fileName, tag)
w.Write([]byte("上传成功"))
}In the above code, we use os.OpenFile() to save the uploaded photos on the local disk of the server, and then insert the photo information into the database.
- Display photos
We categorize and display photos based on the tags of photos uploaded by users. On the server side, we need to query the database, filter photos with specific tags, and return them to the client for display. The following is a sample code:
func getPhotos(w http.ResponseWriter, r *http.Request) {
tag := r.FormValue("tag")
var photos []Photo
if tag == "" {
db.Find(&photos)
} else {
db.Where("tag=?", tag).Find(&photos)
}
result := make([]string, len(photos))
for i, photo := range photos {
result[i] = photo.Path
}
jsonBytes, err := json.Marshal(result)
if err != nil {
fmt.Println(err)
return
}
w.Write(jsonBytes)
}In the above code, we first query the database based on the tag requested by the user and obtain a list of photo paths that meet the conditions. Then convert the photo path list into json format and return it to the client.
On the front-end page, we can use the Masonry.js library to implement the layout of the photo wall. The following is the sample code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>照片墙</title>
<script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/masonry/4.2.2/masonry.pkgd.min.js"></script>
<style>
.photo {
width: 200px;
margin: 10px;
}
</style>
</head>
<body>
<input type="text" id="tag">
<button onclick="getPhotos()">搜索</button>
<div id="container">
<div class="grid-sizer"></div>
</div>
</body>
<script>
function getPhotos() {
var tag = document.getElementById("tag").value;
$.ajax({
url: "/getPhotos",
type: "GET",
data: {"tag": tag},
success: function (data) {
var html = "";
for (var i = 0; i < data.length; i++) {
html += '<div class="photo"><img src="' + data[i] + '"></div>';
}
$("#container").html(html);
var $container = $('#container');
$container.imagesLoaded(function () {
$container.masonry({
itemSelector: ".photo",
columnWidth: ".grid-sizer",
gutter: 10
});
});
}
});
}
</script>
</html>In the client, we send an ajax request to obtain the specified label Photo list. Then the photo list is dynamically generated into photo nodes, and the Masonry.js library is used to implement a photo wall-style layout.
5. Summary
In this implementation, we used golang language to implement the photo wall function. By implementing the process of uploading and displaying photos, we learned about the golang language's support for file operations and database operations. As an emerging programming language, golang not only has advantages in syntax simplicity and efficiency, but also supports concurrent programming, and has its own place in application scenarios that deal with high concurrency and large amounts of data. In the future, we can continue to learn, explore, and apply the golang language in depth.
The above is the detailed content of Golang implements photo wall. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1386
52
What are the vulnerabilities of Debian OpenSSL
Apr 02, 2025 am 07:30 AM
OpenSSL, as an open source library widely used in secure communications, provides encryption algorithms, keys and certificate management functions. However, there are some known security vulnerabilities in its historical version, some of which are extremely harmful. This article will focus on common vulnerabilities and response measures for OpenSSL in Debian systems. DebianOpenSSL known vulnerabilities: OpenSSL has experienced several serious vulnerabilities, such as: Heart Bleeding Vulnerability (CVE-2014-0160): This vulnerability affects OpenSSL 1.0.1 to 1.0.1f and 1.0.2 to 1.0.2 beta versions. An attacker can use this vulnerability to unauthorized read sensitive information on the server, including encryption keys, etc.
How do you write unit tests in Go?
Mar 21, 2025 pm 06:34 PM
The article discusses writing unit tests in Go, covering best practices, mocking techniques, and tools for efficient test management.
How do you use the pprof tool to analyze Go performance?
Mar 21, 2025 pm 06:37 PM
The article explains how to use the pprof tool for analyzing Go performance, including enabling profiling, collecting data, and identifying common bottlenecks like CPU and memory issues.Character count: 159
What is the problem with Queue thread in Go's crawler Colly?
Apr 02, 2025 pm 02:09 PM
Queue threading problem in Go crawler Colly explores the problem of using the Colly crawler library in Go language, developers often encounter problems with threads and request queues. �...
What libraries are used for floating point number operations in Go?
Apr 02, 2025 pm 02:06 PM
The library used for floating-point number operation in Go language introduces how to ensure the accuracy is...
What is the go fmt command and why is it important?
Mar 20, 2025 pm 04:21 PM
The article discusses the go fmt command in Go programming, which formats code to adhere to official style guidelines. It highlights the importance of go fmt for maintaining code consistency, readability, and reducing style debates. Best practices fo
PostgreSQL monitoring method under Debian
Apr 02, 2025 am 07:27 AM
This article introduces a variety of methods and tools to monitor PostgreSQL databases under the Debian system, helping you to fully grasp database performance monitoring. 1. Use PostgreSQL to build-in monitoring view PostgreSQL itself provides multiple views for monitoring database activities: pg_stat_activity: displays database activities in real time, including connections, queries, transactions and other information. pg_stat_replication: Monitors replication status, especially suitable for stream replication clusters. pg_stat_database: Provides database statistics, such as database size, transaction commit/rollback times and other key indicators. 2. Use log analysis tool pgBadg
Transforming from front-end to back-end development, is it more promising to learn Java or Golang?
Apr 02, 2025 am 09:12 AM
Backend learning path: The exploration journey from front-end to back-end As a back-end beginner who transforms from front-end development, you already have the foundation of nodejs,...
