SpringBoot web開發（2）session登錄註冊

SpringBoot web開發（2）session登錄註冊

1. 新建 LoginController.java 文件
2. 使用 session 控制登錄

@Autowired
HttpSession session;
//添加sessionKey
session.setAttribute("name", "admin");
//獲取session
session.getAttribute("name")
//刪除
session.removeAttribute("name");

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示例：(簡單控制登錄)

• 主頁控制器

import javax.servlet.http.HttpSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

@Controller
public class HomeController{

    @Autowired
    HttpSession session;

    @RequestMapping("/")
    public String Home(){
        if(!"admin".equals(session.getAttribute("name"))){
            //重定向 到 登錄頁面
            return "redirect:/login/";
        }
        //登錄成功
        return "home/index";
    }
}

---

• 登錄控制器

package com.learn.first.controller;

import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
// import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.view.RedirectView;

@Controller
@RequestMapping("/login")
public class LoginController{

    @Autowired
    HttpSession session;

    @RequestMapping("")
    public String index(){
        return "login/index";
    }

    @RequestMapping("/in")
    public RedirectView in(@RequestParam String lname,@RequestParam String pwd){
        if("admin".equals(lname) && "admin".equals(pwd)){
            RedirectView redirectTarget = new RedirectView();
            redirectTarget.setContextRelative(true);
            redirectTarget.setUrl("/");
            session.setAttribute("name", "admin");
            
            return redirectTarget;
        }

        RedirectView redirectTarget = new RedirectView();
        redirectTarget.setContextRelative(true);
        redirectTarget.setUrl("/login/");
        return redirectTarget;
    }

    @RequestMapping("/out")
    public String out(){
        // session.setAttribute("name", null);
        session.removeAttribute("name");
        return "redirect:/login/";
    }
}

---

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.7.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.learn</groupId>
	<artifactId>first</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>first</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-thymeleaf</artifactId>
		</dependency>
		<dependency>
			<groupId>nz.net.ultraq.thymeleaf</groupId>
			<artifactId>thymeleaf-layout-dialect</artifactId>
		</dependency>
		
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<scope>runtime</scope>
			<optional>true</optional>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

3. 使用 thymeleaf模板 返回頁面
4. 打開瀏覽器，http：//127.0.0.1:8080 測試
5. demo