警告:上下文初始化期间遇到异常 - 取消刷新尝试:org.springframework.beans.factory.UnsatisfiedDependencyException:创建名称为“userController”的 bean 时出错:通过字段“userService”表达的依赖关系不满足;嵌套异常是 org.springframework.beans.factory.UnsatisfiedDependencyException:创建名称为“userService”的 bean 时出错:通过字段“userDao”表达的依赖关系不满足;嵌套异常是 org.springframework.beans.factory.UnsatisfiedDependencyException:创建名称为“userDao”的 bean 时出错:通过方法“setJdbcTemplate”参数 0 表达的依赖关系不满足;嵌套异常是 org.springframework.beans.factory.NoSuchBeanDefinitionException:没有类型为“org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate”的合格 bean 可用:预计至少有 1 个有资格作为 Autowiring 候选者的 bean。依赖项注释:{}
**userController code**
@Controller
@RequestMapping("user")
public class UserController {
private UserService userService;
@Autowired
public void setUserService(UserService userService) {
this.userService = userService;
}
//======== code for user data insert =============
@GetMapping("/createuser")
public String showUserform(Model theModel) {
theModel.addAttribute("user", new User());
return "userform";
}
//@RequestMapping(value = "/saveUser", method = RequestMethod.POST)
@PostMapping("/saveuser")
public String saveUser(@ModelAttribute("user") @Valid User user,BindingResult result) {
if (result.hasErrors()) {
return "userform";
}
user.setAuthority("ROLE_USER");
user.setEnabled(true);
return "usercreatesuccess";
}
**userservice code**
@Service("userService")
public class UserService {
private UserDao userDao;
@Autowired
public void setUserDao(UserDao userDao) {
this.userDao = userDao;`enter code here`
}
//======== code for user data insert =============
public void saveUser(User user) {
userDao.saveUser(user);
}
public boolean exists(String username) {
return userDao.exists(username);
}
**userDao code**
@Component("userDao")
public class UserDao {
private NamedParameterJdbcTemplate jdbcTemplate;
/*
* @Autowired private PasswordEncoder passwordEncoder;
*/
@Autowired
public void setJdbcTemplate(NamedParameterJdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}
//======== query for user data insert =============
public boolean saveUser(User user) {
MapSqlParameterSource params = new MapSqlParameterSource();
params.addValue("username", user.getUsername());
params.addValue("password", user.getPassword());
params.addValue("firstname", user.getFirstname());
params.addValue("lastname", user.getLastname());
params.addValue("email", user.getEmail());
params.addValue("enabled", user.isEnabled());
params.addValue("authority", user.getAuthority());
jdbcTemplate.update("insert into users ( username, firstname, lastname, password, email, enabled) values ( :username, :firstname, :lastname, :password, :email, :enabled)", params);
return jdbcTemplate.update("insert into authorities (username, authority) values (:username, :authority)", params) == 1;
}
// query for Duplicate username
public boolean exists(String username) {
return jdbcTemplate.queryForObject("select count(*) from users where username=:username", new MapSqlParameterSource("username", username), Integer.class) > 0;
}
**[blog-servlet.xml][1]**
<!-- Add support for component scanning -->
<context:component-scan base-package="com.spring.mvc.blog.xml" />
<!-- Add support for conversion, formatting and validation support -->
<mvc:annotation-driven/>
<!-- Define Spring MVC view resolver -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver"
id="jspViewResolver">
<property name="prefix" value="/WEB-INF/view/" />
<property name="suffix" value=".jsp" />
</bean>
<!-- Add support for reading web resources: css, images, js, etc ... -->
<mvc:resources location="/resources/" mapping="/resources/**"></mvc:resources>
<!-- connection for datasource -->
<jee:jndi-lookup jndi-name="jdbc/spring" id="dataSource"
expected-type="javax.sql.DataSource">
</jee:jndi-lookup>
**error**
[1]: /image/WZWVj.png
最佳答案
您需要定义 JdbcTemplate 的 bean
@Bean
public JdbcTemplate jdbcTemplate(DataSource dataSource) {
return new JdbcTemplate(dataSource);
}
您还需要将注入(inject) jdbcTemplate bean 的 DataSource bean:
@Bean
public DataSource datasource() {
DataSource ds = new DataSource();
ds.setDriverClassName(hostdb_driver);
ds.setUrl(hostdb_url);
ds.setUsername(hostdb_user);
ds.setPassword(hostdb_pass);
return ds;
}
如果您不使用 Java 配置,这里是 XML 配置:
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"/>
要注册要注入(inject) jdbctemplate bean 的数据源,您需要查找正在使用的特定数据库的详细信息。例如,MYSQL 与 Oracle SQL 会有细微的变化。
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/databasename" />
<property name="username" value="root" />
<property name="password" value="password" />
</bean>
不同类型的数据库,driverClassName 和 url 值会有所不同。
关于java - 创建名称为 'userController' : Unsatisfied dependency expressed through field 'userService 的 bean 时出错,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/55200127/