我是Spring的新手，我尝试制作一个学习应用程序，但是在自动装配中遇到了问题，正在添加代码。我正在做弹簧靴。
登录控制器：
package com.cloudnexus.spring.controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import com.cloudnexus.spring.model.Login;
import com.cloudnexus.spring.model.User;
import com.cloudnexus.spring.service.UserService;
@Controller
public class LoginController {
@Autowired
UserService userService;
@RequestMapping(value = "/loginProcess", method = RequestMethod.POST)
public ModelAndView loginProcess(HttpServletRequest request, HttpServletResponse response,
@ModelAttribute("login") Login login) {
ModelAndView mav = null;
User user = userService.validateUser(login);
if (null != user) {
mav = new ModelAndView("welcome");
mav.addObject("firstname", user.getUsername());
} else {
mav = new ModelAndView("login");
mav.addObject("message", "Username or Password is wrong!!");
}
return mav;
}
}
////
登录POJO：
package com.cloudnexus.spring.model;
public class Login {
private String username;
private String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
用户Pojo：
package com.cloudnexus.spring.model;
public class User {
private String username;
private String password;
private int IsActive;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getIsActive() {
return IsActive;
}
public void setIsActive(int isActive) {
IsActive = isActive;
}
}
UserDao：
package com.cloudnexus.spring.dao;
import com.cloudnexus.spring.model.Login;
import com.cloudnexus.spring.model.User;
public interface UserDao {
User validateUser(Login login);
}
UserDaoImpl
package com.cloudnexus.spring.dao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import javax.sql.DataSource;
import com.cloudnexus.spring.model.Login;
import com.cloudnexus.spring.model.User;
public class UserDaoImpl implements UserDao{
@Autowired
DataSource datasource;
@Autowired
JdbcTemplate jdbcTemplate;
public User validateUser(Login login) {
String sql = "select * from users where username='" + login.getUsername() + "' and password='" + login.getPassword()
+ "'";
List<User> users = jdbcTemplate.query(sql, new UserMapper());
return users.size() > 0 ? users.get(0) : null;
}
}
class UserMapper implements RowMapper<User> {
public User mapRow(ResultSet rs, int arg1) throws SQLException {
User user = new User();
user.setUsername(rs.getString("Name"));
user.setPassword(rs.getString("Password"));
user.setIsActive(rs.getInt("IsActive"));
return user;
}
}
UserService：
package com.cloudnexus.spring.service;
import com.cloudnexus.spring.model.Login;
import com.cloudnexus.spring.model.User;
public interface UserService {
User validateUser(Login login);
}
UserServiceImpl
package com.cloudnexus.spring.service;
import org.springframework.beans.factory.annotation.Autowired;
import com.cloudnexus.spring.dao.UserDao;
import com.cloudnexus.spring.model.Login;
import com.cloudnexus.spring.model.User;
public class UserServiceImpl implements UserService{
@Autowired
public UserDao userDao;
public User validateUser(Login login) {
return userDao.validateUser(login);
}
}
spring bean配置文件：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<context:component-scan base-package="com.cloudnexus.spring" />
<context:annotation-config />
<bean id="userService" class="com.cloudnexus.spring.service.UserServiceImpl">
<property name="userService" ref="userService"></property>
</bean>
<bean name="userDao" class="com.cloudnexus.spring.dao.UserDaoImpl">
<property name="dataSource" ref="dataSource"></property>
</bean>
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="datasource" />
</bean>
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.microsoft.sqlserver.jdbc.SQLServerDriver" />
<property name="url" value=";DatabaseName=" />
<property name="username" value="" />
<property name="password" value="" />
</bean>
</beans>
创建了Controller的构造函数并自动连接，如上面的代码所示；
以下是我得到的错误：
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'loginController': Unsatisfied dependency expressed through field 'userService': Error creating bean with name 'userService': Unsatisfied dependency expressed through field 'userDao': Error creating bean with name 'userDao' defined in ServletContext resource [/WEB-INF/springBeanConfiguration.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'dataSource' of bean class [com.cloudnexus.spring.dao.UserDaoImpl]: Bean property 'dataSource' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userDao' defined in ServletContext resource [/WEB-INF/springBeanConfiguration.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'dataSource' of bean class [com.cloudnexus.spring.dao.UserDaoImpl]: Bean property 'dataSource' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userService': Unsatisfied dependency expressed through field 'userDao': Error creating bean with name 'userDao' defined in ServletContext resource [/WEB-INF/springBeanConfiguration.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'dataSource' of bean class [com.cloudnexus.spring.dao.UserDaoImpl]: Bean property 'dataSource' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userDao' defined in ServletContext resource [/WEB-INF/springBeanConfiguration.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'dataSource' of bean class [com.cloudnexus.spring.dao.UserDaoImpl]: Bean property 'dataSource' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor $ AutowiredFieldElement.inject（AutowiredAnnotationBeanPostProcessor.java:569） org.springframework.beans.factory.annotation.InjectionMetadata.inject（InjectionMetadata.java:88） org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues（AutowiredAnnotationBeanPostProcessor.java:349） org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean（AbstractAutowireCapableBeanFactory.java:1214） org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java:543） org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean（AbstractAutowireCapableBeanFactory.java:482） org.springframework.beans.factory.support.AbstractBeanFactory $ 1.getObject（AbstractBeanFactory.java:306） org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton（DefaultSingletonBeanRegistry.java:230） org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java:302） org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:197） org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons（DefaultListableBeanFactory.java:776） org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization（AbstractApplicationContext.java:861） org.springframework.context.support.AbstractApplicationContext.refresh（AbstractApplicationContext.java:541） org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext（FrameworkServlet.java:668） org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext（FrameworkServlet.java:634） org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext（FrameworkServlet.java:682） org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext（FrameworkServlet.java:553） org.springframework.web.servlet.FrameworkServlet.initServletBean（FrameworkServlet.java:494） org.springframework.web.servlet.HttpServletBean.init（HttpServletBean.java:136） javax.servlet.GenericServlet.init（GenericServlet.java:160） org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:502） org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:100） org.apache.catalina.valves.AccessLogValve.invoke（AccessLogValve.java:953） org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:408） org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:1041） org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:603） org.apache.tomcat.util.net.JIoEndpoint $ SocketProcessor.run（JIoEndpoint.java:312） java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1149） java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:624） java.lang.Thread.run（Thread.java:748）
答案 0 :(得分：0)
您的jdbcTemplate bean需要一个名为datasource的bean，就像您在此处进行设置（在 ref=... 部分：
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="datasource" />
</bean>
但是您的datasource bean不存在。原因是因为您已在 dataSource
bean id="dataSource"（注意大写的“ S”）
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.microsoft.sqlserver.jdbc.SQLServerDriver" />
<property name="url" value=";DatabaseName=" />
<property name="username" value="" />
<property name="password" value="" />
</bean>
因此将其更改为“数据源”，例如 bean id="datasource" 或将jdbcTemplate中的引用更改为 ref="dataSource"
<property name="url" value=";DatabaseName=" />看起来也不正确，我想您在这里错过了正确的value，";DatabaseName="看起来错误或不完整。
更新
由于您使用的是xml spring配置，因此@Autowired和UserDaoImpl类中的UserServiceImpl注释是不必要的。但是，xml配置要求存在等效的getter / setter。因此，将您的代码更改为：
在您的UserDaoImpl中，您根本不需要dataSource bean，因此我们将其删除。
public class UserDaoImpl implements UserDao{
JdbcTemplate jdbcTemplate;
public User validateUser(Login login) {
String sql = "select * from users where username='" + login.getUsername() + "' and password='" + login.getPassword()
+ "'";
List<User> users = jdbcTemplate.query(sql, new UserMapper());
return users.size() > 0 ? users.get(0) : null;
}
public JdbcTemplate getJdbcTemplate() {
return jdbcTemplate;
}
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}
}
但是您确实需要jdbcTemplate bean，并且在xml定义中没有设置它，因此也将spring xml文件更新为：
<bean name="userDao" class="com.cloudnexus.spring.dao.UserDaoImpl">
<property name="jdbcTemplate" ref="jdbcTemplate"></property>
</bean>
和
public class UserServiceImpl implements UserService{
private UserDao userDao;
public User validateUser(Login login) {
return userDao.validateUser(login);
}
public UserDao getUserDao() {
return userDao;
}
public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}
}
此外，spring xml配置文件中还有另一个错误。在userService bean定义中，您将其再次设置为属性：
<property name="userService" ref="userService"></property>
这是错误的，您应该在此处设置userDao。更新为：
<bean id="userService" class="com.cloudnexus.spring.service.UserServiceImpl">
<property name="userDao" ref="userDao"></property>
</bean>