What Is Blade?

Blade is a pursuit of simple, efficient Web framework, so that JavaWeb development becomes even more powerful, both in performance and flexibility. If you like to try something interesting, I believe you will love it. If you think it's good, you can support it with a star or by donating :blush:

Features

• A new generation MVC framework that doesn't depend on other libraries
• Get rid of SSH's bloated, modular design
• Source is less than 500kb, learning it is also simple
• RESTful-style routing design
• Template engine support, view development more flexible
• High performance, 100 concurrent qps 20w/s
• Run the JAR package to open the web service
• Streams-style API
• CSRF and XSS defense
• Basic Auth and Authorization
• Supports plug-in extensions
• Support webjars resources
• Tasks based on cron expressions
• Built-in a variety of commonly used middleware
• Built-in Response output
• JDK8 +

Overview

» Simplicity: The design is simple, easy to understand and doesn't introduce many layers between you and the standard library. The goal of this project is that the users should be able to understand the whole framework in a single day. » Elegance: blade supports the RESTful style routing interface, has no invasive interceptors and provides the writing of a DSL grammar. » Easy deploy: supports maven package jar file running.

Quick Start

Create a basic Maven or Gradle project.

Do not create a webapp project, Blade does not require much trouble.

Run with Maven:

<dependency>
    <groupId>com.hellokaton</groupId>
    <artifactId>blade-core</artifactId>
    <version>2.1.2.RELEASE</version>
</dependency>

or Gradle:

compile 'com.hellokaton:blade-core:2.1.2.RELEASE'

Write the main method and the Hello World:

public static void main(String[] args) {
    Blade.create().get("/", ctx -> ctx.text("Hello Blade")).start();
}

Open http://localhost:9000 in your browser to see your first Blade application!

Contents

• Register Route
  • HardCode
  • Controller
• Request Parameter
  • URL Parameter
  • Form Parameter
  • Path Parameter
  • Body Parameter
  • Parse To Model
• Get Environment
• Get Header
• Get Cookie
• Static Resource
• Upload File
• Download File
• Set Session
• Render To Browser
  • Render Response
  • Render Text
  • Render Html
• Render Template
  • Default Template
  • Jetbrick Template
• Redirects
• Write Cookie
• Web Hook
• Logging
• Basic Auth
• Change Server Port
• Configuration SSL
• Custom Exception Handler

Register Route

HardCode

public static void main(String[] args) {
    // Create multiple routes GET, POST, PUT, DELETE using Blade instance
    Blade.create()
        .get("/user/21", getting)
        .post("/save", posting)
        .delete("/remove", deleting)
        .put("/putValue", putting)
        .start();
}

Controller

@Path
public class IndexController {

    @GET("/login")
    public String login(){
        return "login.html";
    }
    
    @POST(value = "/login", responseType = ResponseType.JSON)
    public RestResponse doLogin(RouteContext ctx){
        // do something
        return RestResponse.ok();
    }

}

Request Parameter

URL Parameter

Using RouteContext

public static void main(String[] args) {
    Blade.create().get("/user", ctx -> {
        Integer age = ctx.queryInt("age");
        System.out.println("age is:" + age);
    }).start();
}

Using @Query annotation

@GET("/user")
public void savePerson(@Query Integer age){
  System.out.println("age is:" + age);
}

Test it with sample data from the terminal

curl -X GET http://127.0.0.1:9000/user?age=25

Form Parameter

Here is an example:

Using RouteContext

public static void main(String[] args) {
    Blade.create().get("/user", ctx -> {
        Integer age = ctx.fromInt("age");
        System.out.println("age is:" + age);
    }).start();
}

Using @Form Annotation

@POST("/save")
public void savePerson(@Form String username, @Form Integer age){
  System.out.println("username is:" + username + ", age is:" + age);
}

Test it with sample data from the terminal

curl -X POST http://127.0.0.1:9000/save -F username=jack -F age=16

Path Parameter

Using RouteContext

public static void main(String[] args) {
    Blade blade = Blade.create();
    // Create a route: /user/:uid
    blade.get("/user/:uid", ctx -> {
        Integer uid = ctx.pathInt("uid");
        ctx.text("uid : " + uid);
    });

    // Create two parameters route
    blade.get("/users/:uid/post/:pid", ctx -> {
        Integer uid = ctx.pathInt("uid");
        Integer pid = ctx.pathInt("pid");
        String msg = "uid = " + uid + ", pid = " + pid;
        ctx.text(msg);
    });
    
    // Start blade
    blade.start();
}

Using @PathParam Annotation

@GET("/users/:username/:page")
public void userTopics(@PathParam String username, @PathParam Integer page){
    System.out.println("username is:" + usernam + ", page is:" + page);
}

Test it with sample data from the terminal

curl -X GET http://127.0.0.1:9000/users/hellokaton/2

Body Parameter

public static void main(String[] args) {
    Blade.create().post("/body", ctx -> {
        System.out.println("body string is:" + ctx.bodyToString());
    }).start();
}

Using @Body Annotation

@POST("/body")
public void readBody(@Body String data){
    System.out.println("data is:" + data);
}

Test it with sample data from the terminal

curl -X POST http://127.0.0.1:9000/body -d '{"username":"hellokaton","age":22}'

Parse To Model

This is the User model.

public class User {
    private String username;
    private Integer age;
    // getter and setter
}

By Annotation

@POST("/users")
public void saveUser(@Form User user) {
    System.out.println("user => " + user);
}

Test it with sample data from the terminal

curl -X POST http://127.0.0.1:9000/users -F username=jack -F age=16

Custom model identification

@POST("/users")
public void saveUser(@Form(name="u") User user) {
    System.out.println("user => " + user);
}

Test it with sample data from the terminal

curl -X POST http://127.0.0.1:9000/users -F u[username]=jack -F u[age]=16

Body Parameter To Model

@POST("/body")
public void body(@Body User user) {
    System.out.println("user => " + user);
}

Test it with sample data from the terminal

curl -X POST http://127.0.0.1:9000/body -d '{"username":"hellokaton","age":22}'

Get Environment

Environment environment = WebContext.blade().environment();
String version = environment.get("app.version", "0.0.1");

Get Header

By Context

@GET("header")
public void readHeader(RouteContext ctx){
    System.out.println("Host => " + ctx.header("Host"));
    // get useragent
    System.out.println("UserAgent => " + ctx.userAgent());
    // get client ip
    System.out.println("Client Address => " + ctx.address());
}

By Annotation

@GET("header")
public void readHeader(@Header String host){
    System.out.println("Host => " + host);
}

Get Cookie

By Context

@GET("cookie")
public void readCookie(RouteContext ctx){
    System.out.println("UID => " + ctx.cookie("UID"));
}

By Annotation

@GET("cookie")
public void readCookie(@Cookie String uid){
    System.out.println("Cookie UID => " + uid);
}

Static Resource

Blade builds a few static resource catalog, as long as you will save the resource file in the static directory under the classpath, and then browse http://127.0.0.1:9000/static/style.css

If you want to customize the static resource URL

Blade.create().addStatics("/mydir");

Of course you can also specify it in the configuration file. application.properties (location in classpath)

mvc.statics=/mydir

Upload File

By Request

@POST("upload")
public void upload(Request request){
    request.fileItem("img").ifPresent(fileItem -> {
        fileItem.moveTo(new File(fileItem.getFileName()));
    });
}

By Annotation

@POST("upload")
public void upload(@Multipart FileItem fileItem){
    // Save to new path
    fileItem.moveTo(new File(fileItem.getFileName()));
}

Download File

@GET(value = "/download", responseType = ResponseType.STREAM)
public void download(Response response) throws IOException {
    response.write("abcd.pdf", new File("146373013842336153820220427172437.pdf"));
}

If you want to preview certain files in your browser

@GET(value = "/preview", responseType = ResponseType.PREVIEW)
public void preview(Response response) throws IOException {
    response.write(new File("146373013842336153820220427172437.pdf"));
}

Set Session

The session is disabled by default, you must enable the session.

Blade.create()
     .http(HttpOptions::enableSession)
     .start(Application.class, args);

💡 It can also be enabled using a configuration file，http.session.enabled=true

public void login(Session session){
    // if login success
    session.attribute("login_key", SOME_MODEL);
}

Render To Browser

Render Response

By Context

@GET("users/json")
public void printJSON(RouteContext ctx){
    User user = new User("hellokaton", 18);
    ctx.json(user);
}

By Annotation

This form looks more concise 😶

@GET(value = "/users/json", responseType = ResponseType.JSON)
public User printJSON(){
    return new User("hellokaton", 18);
}

Render Text

@GET("text")
public void printText(RouteContext ctx){
    ctx.text("I Love Blade!");
}

or

@GET(value = "/text", responseType = ResponseType.TEXT)
public String printText(RouteContext ctx){
    return "I Love Blade!";
}

Render Html

@GET("html")
public void printHtml(RouteContext ctx){
    ctx.html("<center><h1>I Love Blade!</h1></center>");
}

or

@GET(value = "/html", responseType = ResponseType.HTML)
public String printHtml(RouteContext ctx){
    return "<center><h1>I Love Blade!</h1></center>";
}

Render Template

By default all template files are in the templates directory; in most of the cases you do not need to change it.

Default Template

By default, Blade uses the built-in template engine, which is very simple. In a real-world web project, you can try several other extensions.

public static void main(String[] args) {
    Blade.create().get("/hello", ctx -> {
        ctx.attribute("name", "hellokaton");
        ctx.render("hello.html");
    }).start(Hello.class, args);
}

The hello.html template

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Hello Page</title>
</head>
<body>

    <h1>Hello, ${name}</h1>

</body>
</html>

Jetbrick Template

Config Jetbrick Template

Create a BladeLoader class and load some config

@Bean
public class TemplateConfig implements BladeLoader {

    @Override
    public void load(Blade blade) {
        blade.templateEngine(new JetbrickTemplateEngine());
    }

}

Write some data for the template engine to render

public static void main(String[] args) {
    Blade.create().get("/hello", ctx -> {
        User user = new User("hellokaton", 50);
        ctx.attribute("user", user);
        ctx.render("hello.html");
    }).start(Hello.class, args);
}

The hello.html template

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Hello Page</title>
</head>
<body>

    <h1>Hello, ${user.username}</h1>

    #if(user.age > 18)
        <p>Good Boy!</p>
    #else
        <p>Gooood Baby!</p>
    #end

</body>
</html>

Render API

Redirects

@GET("redirect")
public void redirectToGithub(RouteContext ctx){
    ctx.redirect("https://github.com/hellokaton");
}

Redirect API

Write Cookie

@GET("write-cookie")
public void writeCookie(RouteContext ctx){
    ctx.cookie("hello", "world");
    ctx.cookie("UID", "22", 3600);
}

Cookie API

Web Hook

WebHook is the interface in the Blade framework that can be intercepted before and after the execution of the route.

public static void main(String[] args) {
    // All requests are exported before execution before
    Blade.create().before("/*", ctx -> {
        System.out.println("before...");
    }).start();
}

Logging

Blade uses slf4j-api as logging interface, the default implementation of a simple log package (modified from simple-logger); if you need complex logging you can also use a custom library, you only need to exclude the blade-log from the dependencies.

private static final Logger log = LoggerFactory.getLogger(Hello.class);

public static void main(String[] args) {
    log.info("Hello Info, {}", "2017");
    log.warn("Hello Warn");
    log.debug("Hello Debug");
    log.error("Hello Error");
}

Basic Auth

Blade includes a few middleware, like Basic Authentication; of course, it can also be customized to achieve more complex goals.

public static void main(String[] args) {
    Blade.create().use(new BasicAuthMiddleware()).start();
}

Specify the user name and password in the application.properties configuration file.

http.auth.username=admin
http.auth.password=123456

Change Server Port

There are three ways to modify the port: hard coding it, in a configuration file, and through a command line parameter.

Hard Coding

Blade.create().listen(9001).start();

Configuration For application.properties

server.port=9001

Command Line

java -jar blade-app.jar --server.port=9001

Configuration SSL

Configuration For application.properties

server.ssl.enable=true
server.ssl.cert-path=cert.pem
server.ssl.private-key-path=private_key.pem
server.ssl.private-key-pass=123456

** Configuration using INettySslCustomizer **

#Specify any properties your customizer needs, for example
server.ssl.enable=true
server.keystore.path=fully qualified path
server.keystore.type=PKCS12
server.keystore.password=mypass
server.keystore.alias=optional alias

• Create your implementation of INettySslCustomizer
• Register it with Blade class

	   MyNettySslCustomizer nc = new MyNettySslCustomizer();	
		Blade.create()
			.setNettySslCustomizer(nc)
			.start(App.class, args);
		}

Sample implementation of INettySslCustomizer

public class MyNettySSLCustomizer implements INettySslCustomizer {

	public SslContext getCustomSslContext(Blade blade) {
		SslContext sslctx = null;

		// get my custom properties from the environment
		String keystoreType = blade.getEnv("server.keystore.type", null);
		String keystorePath = blade.getEnv("server.keystore.path", null);
		String keystorePass = blade.getEnv("server.keystore.password", null);

		if (verifyKeystore(keystoreType, keystorePath, keystorePass)) {

			try (FileInputStream instream = new FileInputStream(new File(keystorePath))) {

				// verify I can load store and password is valid
				KeyStore keystore = KeyStore.getInstance(keystoreType);
				char[] storepw = keystorePass.toCharArray();
				keystore.load(instream, storepw);
				
				KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
				kmf.init(keystore, storepw);
				sslctx = SslContextBuilder.forServer(kmf).build();
				
			} catch (Exception ex) {
				log.error("Keystore validation failed " + ex.getMessage());
			}
			
		} else {
			log.error("Unable to load keystore, sslContext creation failed.");
		}

		return sslctx;
	}

Custom Exception Handler

Blade has an exception handler already implemented by default; if you need to deal with custom exceptions, you can do it like follows.

@Bean
public class GlobalExceptionHandler extends DefaultExceptionHandler {
    
    @Override
    public void handle(Exception e) {
        if (e instanceof CustomException) {
            CustomException customException = (CustomException) e;
            String code = customException.getCode();
            // do something
        } else {
            super.handle(e);
        }
    }

}

Besides looking easy, the features above are only the tip of the iceberg, and there are more surprises to see in the documentation and sample projects:

• Blade Demos
• Awesome Blade

Change Logs

See Here

Contact

• Twitter: hellokaton
• Mail: [email protected]

Contributors

Thanks goes to these wonderful people

Contributions of any kind are welcome!

Licenses

Please see Apache License