发表于： 2018-02-05 23:32:38

搭SSM框架：

报错：java.lang.IllegalStateException: Failed to load ApplicationContext

Causedby: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userController' defined infile[E:\project\ssm\target\classes\com\alibaba\controller\UserController.class]:BeanPostProcessor before instantiation of bean failed; nested exception isorg.springframework.beans.factory.BeanCreationException: Error creating beanwith name'org.springframework.aop.support.DefaultBeanFactoryPointcutAdvisor#0':Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError:org/aspectj/weaver/reflect/ReflectionWorld$ReflectionWorldException

报错：Error creating bean with name Initialization of bean failed

在POM.xml里面加入aspectjweaver.jar包就行了

<dependency>
<groupId> org.aspectj</groupId >
<artifactId> aspectjweaver</artifactId >
<version> 1.8.7</version >
</dependency>

继续报错：Could not autowire field: private com.alibaba.service.UserService com.alibaba.controller.UserController.userService; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userServiceImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.alibaba.mapper.UserMapper com.alibaba.service.impl.UserServiceImpl.userMapper; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.alibaba.mapper.UserMapper] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

今天根据一个新的教程，把student给替换了

首先是studentjava类

public class Student {
    private int id;
    private String name;
    private int qq;
    private String major;
    public Student() {
        super();
    }
    public Student(int id,String name,int qq,String major) {
        super();
        this.id = id;
        this.name = name;
        this.qq = qq;
        this.major = major;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getQq() {
        return qq;
    }

    public void setQq(int qq) {
        this.qq = qq;
    }

    public String getMajor() {
        return major;
    }

    public void setMajor(String major) {
        this.major = major;
    }

然后是studentService

public interface StudentService {

  void saveStudent(Student student);

  boolean deleteStudent(int id);

  boolean updateStudent(Student student);

  Student findStudentById(int id);

  List<Student> findAll();
}

StudentServiceImpl

@Service
public class StudentServiceImpl implements StudentService {
    @Autowired
    private StudentMapper studentMapper;
    @Override
    public void saveStudent(Student student) {
        studentMapper.saveStudent(student);
    }
    @Override
    public boolean updateStudent(Student student) {
        return studentMapper.updateStudent(student);
        }
    @Override
    public boolean deleteStudent(int id) {
        return studentMapper.deleteStudent(id);
        }
        @Override
    public Student findStudentById(int id) {
        Student student = studentMapper.findStudentById(id);
        return student;
    }
    @Override
    public List<Student> findAll(){
        List<Student> allStudent = studentMapper.findAll();
        return allStudent;
    }
}

StudentController里面

@Controller
@RequestMapping("/student")
public class StudentController {

    @Resource
    private StudentService studentService;

        @RequestMapping(value = "/student/u/{id}",method = RequestMethod.DELETE)
    public String deleteStudent(@PathVariable int id){
        studentService.deleteStudent(id);
        //传值必须要有model.addAttribute方法
        return "redirect:/student/list";
    }
    @RequestMapping(value = "/student/list",method = RequestMethod.GET)
    public String list(Model model){
        List<Student> students=studentService.findAll();
        model.addAttribute("studentList", students);
        return "listJsp";
    }
}

运行，成功

后来做了个进入管理的页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<%
    pageContext.setAttribute("path", request.getContextPath());
%>
<!DOCTYPE html >
<html>
<head>
    <title>首页</title>
    <style type="text/css">
        a {
            text-decoration: none;
            color: #fff;
            font-size: 14px;
        }

        h3 {
            width: 180px;
            height: 38px;
            margin: 100px auto;
            text-align: center;
            line-height: 38px;
            background: #5BC0DE;
            border-radius: 4px;
        }
    </style>
</head>
<body>
<h3>
    <a href="${pageContext.request.contextPath}/student/student/list">进入用户管理页</a>
</h3>
</body>
</html>