springboot使用begin
时间: 2024-01-30 07:04:16 浏览: 18
你好!对于使用Spring Boot进行开发,你可以按照以下步骤开始:
1. 安装Java:确保你的电脑已经安装了Java开发环境。你可以从Oracle官网下载Java Development Kit (JDK)并按照说明进行安装。
2. 下载并配置Spring Boot:访问Spring官方网站(https://spring.io/),找到Spring Boot并下载最新版本的压缩包。
3. 解压缩压缩包:将下载的压缩包解压到你想要的目录中。
4. 创建一个新的Spring Boot项目:打开命令行终端,切换到解压后的目录中。运行以下命令以创建一个新的Spring Boot项目:
```
$ mkdir myproject
$ cd myproject
$ ../spring-<version>/bin/spring init
```
5. 编写代码:进入新创建的项目目录,使用你喜欢的IDE(如IntelliJ IDEA、Eclipse等)打开项目,并开始编写你的代码。
6. 运行应用程序:使用命令行终端进入项目目录,并运行以下命令以启动Spring Boot应用程序:
```
$ ./mvnw spring-boot:run
```
7. 测试应用程序:在浏览器中访问http://localhost:8080,应该能够看到应用程序的欢迎页面。
这只是一个简单的开始。Spring Boot提供了许多功能和特性,例如自动配置、依赖管理等。你可以在官方文档中进一步了解Spring Boot的功能和用法。祝你使用Spring Boot开发愉快!
相关问题
springboot mysql触发器
在使用Spring Boot访问MySQL数据库时,可以使用JdbcTemplate或者MyBatis等框架来操作数据库。而MySQL触发器是一种在数据库中定义的特殊程序,可以在数据库表上执行自动化操作。如果需要在Spring Boot应用程序中使用MySQL触发器,可以使用JdbcTemplate或者MyBatis等框架来执行相应的SQL语句。
以下是一个使用JdbcTemplate来创建MySQL触发器的示例代码:
```java
@Autowired
private JdbcTemplate jdbcTemplate;
public void createTrigger() {
String sql = "CREATE TRIGGER my_trigger AFTER INSERT ON my_table FOR EACH ROW BEGIN UPDATE other_table SET field = NEW.field WHERE id = NEW.id; END";
jdbcTemplate.execute(sql);
}
```
在上面的示例中,我们使用JdbcTemplate来执行创建触发器的SQL语句。在创建触发器时,需要指定触发器的名称、触发事件、触发条件和触发操作等参数。
除了使用JdbcTemplate外,也可以使用MyBatis等框架来执行SQL语句,具体实现方式可以参考相应的文档和示例。
springboot配置jwt
在Spring Boot应用程序中,配置JWT的步骤如下:
1. 添加相关的依赖:在pom.xml文件中添加以下依赖:
```
<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt</artifactId>
<version>0.9.1</version>
</dependency>
```
2. 创建一个JWT工具类:该类用于处理JWT的生成和验证。以下是一个简单的示例:
```
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.stereotype.Component;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.function.Function;
@Component
public class JwtTokenUtil {
private static final long JWT_TOKEN_VALIDITY = 5 * 60 * 60;
@Value("${jwt.secret}")
private String secret;
public String getUsernameFromToken(String token) {
return getClaimFromToken(token, Claims::getSubject);
}
public Date getExpirationDateFromToken(String token) {
return getClaimFromToken(token, Claims::getExpiration);
}
public <T> T getClaimFromToken(String token, Function<Claims, T> claimsResolver) {
final Claims claims = getAllClaimsFromToken(token);
return claimsResolver.apply(claims);
}
private Claims getAllClaimsFromToken(String token) {
return Jwts.parser().setSigningKey(secret).parseClaimsJws(token).getBody();
}
private Boolean isTokenExpired(String token) {
final Date expiration = getExpirationDateFromToken(token);
return expiration.before(new Date());
}
public String generateToken(UserDetails userDetails) {
Map<String, Object> claims = new HashMap<>();
return doGenerateToken(claims, userDetails.getUsername());
}
private String doGenerateToken(Map<String, Object> claims, String subject) {
final Date createdDate = new Date();
final Date expirationDate = new Date(createdDate.getTime() + JWT_TOKEN_VALIDITY * 1000);
return Jwts.builder().setClaims(claims).setSubject(subject)
.setIssuedAt(createdDate).setExpiration(expirationDate)
.signWith(SignatureAlgorithm.HS512, secret).compact();
}
public Boolean validateToken(String token, UserDetails userDetails) {
final String username = getUsernameFromToken(token);
return (username.equals(userDetails.getUsername()) && !isTokenExpired(token));
}
}
```
3. 创建一个JWT过滤器:该过滤器用于验证请求的JWT。以下是一个简单的示例:
```
import io.jsonwebtoken.ExpiredJwtException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.stereotype.Component;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@Component
public class JwtRequestFilter extends OncePerRequestFilter {
@Autowired
private UserDetailsService userDetailsService;
@Autowired
private JwtTokenUtil jwtTokenUtil;
@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
throws ServletException, IOException {
final String requestTokenHeader = request.getHeader("Authorization");
String username = null;
String jwtToken = null;
if (requestTokenHeader != null && requestTokenHeader.startsWith("Bearer ")) {
jwtToken = requestTokenHeader.substring(7);
try {
username = jwtTokenUtil.getUsernameFromToken(jwtToken);
} catch (IllegalArgumentException e) {
logger.error("Unable to get JWT Token");
} catch (ExpiredJwtException e) {
logger.error("JWT Token has expired");
}
} else {
logger.warn("JWT Token does not begin with Bearer String");
}
if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) {
UserDetails userDetails = this.userDetailsService.loadUserByUsername(username);
if (jwtTokenUtil.validateToken(jwtToken, userDetails)) {
UsernamePasswordAuthenticationToken usernamePasswordAuthenticationToken = new UsernamePasswordAuthenticationToken(
userDetails, null, userDetails.getAuthorities());
usernamePasswordAuthenticationToken
.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
SecurityContextHolder.getContext().setAuthentication(usernamePasswordAuthenticationToken);
}
}
chain.doFilter(request, response);
}
}
```
4. 在Spring Boot应用程序中配置JWT:您需要在应用程序配置文件中添加以下属性:
```
jwt.secret=your_secret_key_here
```
5. 在Spring Boot应用程序中启用JWT:您需要在Spring Boot应用程序中启用JWT。以下是一个简单的示例:
```
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration;
import org.springframework.context.annotation.Bean;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
@SpringBootApplication(exclude = {SecurityAutoConfiguration.class})
@EnableWebSecurity
public class Application extends WebSecurityConfigurerAdapter {
@Autowired
private JwtAuthenticationEntryPoint jwtAuthenticationEntryPoint;
@Autowired
private UserDetailsService jwtUserDetailsService;
@Autowired
private JwtRequestFilter jwtRequestFilter;
@Autowired
public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
auth.userDetailsService(jwtUserDetailsService).passwordEncoder(passwordEncoder());
}
@Bean
public PasswordEncoder passwordEncoder() {
return new BCryptPasswordEncoder();
}
@Bean
public JwtAuthenticationEntryPoint jwtAuthenticationEntryPointBean() throws Exception {
return new JwtAuthenticationEntryPoint();
}
@Bean
public JwtRequestFilter jwtRequestFilterBean() throws Exception {
return new JwtRequestFilter();
}
@Override
@Bean
public AuthenticationManager authenticationManagerBean() throws Exception {
return super.authenticationManagerBean();
}
@Override
protected void configure(HttpSecurity httpSecurity) throws Exception {
httpSecurity.csrf().disable()
.authorizeRequests().antMatchers("/authenticate").permitAll().
anyRequest().authenticated().and().
exceptionHandling().authenticationEntryPoint(jwtAuthenticationEntryPoint).and().sessionManagement()
.sessionCreationPolicy(SessionCreationPolicy.STATELESS);
httpSecurity.addFilterBefore(jwtRequestFilter, UsernamePasswordAuthenticationFilter.class);
}
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
```
以上就是在Spring Boot应用程序中配置JWT的基本步骤。