maven各种类的基本写法

一、model类

        专业类：（专业类和学校类做了多对多映射）

  package com.cqvie.model;

import java.sql.Date;
import java.util.HashSet;
import java.util.Set;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToMany;
import javax.persistence.Table;

import org.codehaus.jackson.annotate.JsonIgnore;
import org.codehaus.jackson.annotate.JsonIgnoreProperties;

@Table(name = "major")
@Entity
public class Major {
private int majorID;// 专业ID
private int majorCode;// 专业代码
private String majorName;// 专业名称
private Date createDate;// 创建时间
private Set<School> schools =new HashSet<School>();

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "majorID", nullable = false, length = 10)
public int getMajorID() {
return majorID;
}

public void setMajorID(int majorID) {
this.majorID = majorID;
}

@Column(name = "majorCode", nullable = false, length = 10)
public int getMajorCode() {
return majorCode;
}

public void setMajorCode(int majorCode) {
this.majorCode = majorCode;
}

@Column(name = "majorName", nullable = false, length = 20)
public String getMajorName() {
return majorName;
}

public void setMajorName(String majorName) {
this.majorName = majorName;
}

@Column(name = "createDate", nullable = false, length = 10)
public Date getCreateDate() {
return createDate;
}

public void setCreateDate(Date createDate) {
this.createDate = createDate;
}
@ManyToMany(mappedBy = "majors")
@JsonIgnore
public Set<School> getSchools() {
return schools;
}

public void setSchools(Set<School> schools) {
this.schools = schools;
}

@Override
public String toString() {
return "Major [majorID=" + majorID + ", majorCode=" + majorCode + ", majorName=" + majorName + ", createDate="
+ createDate + "]";
}

}

学校类：

package com.cqvie.model;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.Table;

@Entity
@Table(name = "school")
public class School {
private int schoolID;// 高校ID
private String schName;// 高校名称
private String category;// 高校类别，专科或者本科
private String position;// 地址
private String web;// 高校官网
private List<Major> majors = new ArrayList<Major>();// 学校对应的专业

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "schoolID", nullable = false, length = 10)
public int getSchoolID() {
return schoolID;
}

public void setSchoolID(int schoolID) {
this.schoolID = schoolID;
}

@Column(name = "schoolName", nullable = true, length = 10)
public String getSchName() {
return schName;
}

public void setSchName(String schName) {
this.schName = schName;
}

@Column(name = "category", nullable = false, length = 20)
public String getCategory() {
return category;
}

public void setCategory(String category) {
this.category = category;
}

@Colu
4000
mn(name = "position", nullable = false, length = 9)
public String getPosition() {
return position;
}

public void setPosition(String position) {
this.position = position;
}

@Column(name = "web", nullable = false, length = 50)
public String getWeb() {
return web;
}

public void setWeb(String web) {
this.web = web;
}

@ManyToMany(cascade = CascadeType.ALL)
@JoinTable(name = "school_major", joinColumns = { @JoinColumn(name = "schoolID") }, inverseJoinColumns = {
@JoinColumn(name = "MajorId") })
public List<Major> getMajors() {
return majors;
}

public void setMajors(List<Major> majors) {
this.majors = majors;
}

@Override
public String toString() {
return "School [schoolID=" + schoolID + ", schName=" + schName + ", category=" + category + ", position="
+ position + ", web=" + web + ", majors=" + majors + "]";
}

}


二、Dao层类：
       (一）类名前加注解：@Repository("xxx")作为调用该类的ID

     （二）激活sessionFactory：得到当前线程

@Resource
protected SessionFactory sessionFactory;

     （三）方法内部通过sessionFactory获得session
Session session = sessionFactory.getCurrentSession();

实例：
package com.cqvie.dao;

import java.util.List;

import javax.annotation.Resource;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.criterion.Restrictions;
import org.springframework.stereotype.Repository;

import com.cqvie.model.Major;

@Repository("majorDao")
public class MajorDao {
@Resource
protected SessionFactory sessionFactory;

// 关键字模糊查询
public List<Major> fuzzyQuery(String keyword) {
Session session = sessionFactory.getCurrentSession();
String sql = "from Major where majorName like ? ";
Query query = session.createQuery(sql);
query.setString(0, "%" + keyword + "%");
List<Major> majors = query.list();
return majors;
}
}


三、service层类
     (一)、类名前加注解：@Transactional   声明这个service所有方法需要事务管理。每一个业务方法开始时都会打开一个事务。 

                                            @Service("xxx)  service唯一标识

   (二)、激活需要使用的dao层类：@Resource
                                                    private MajorDao majorDao;

实例：package com.cqvie.service;

import java.util.List;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.cqvie.dao.MajorDao;
import com.cqvie.model.Major;
import com.cqvie.model.School;

@Transactional
@Service("majorService")
public class MajorService {
@Resource
private MajorDao majorDao;

// 关键字模糊查询
public List<Major> fuzzyQuery(String keyword) {
return majorDao.fuzzyQuery(keyword);
}

// 关键字模糊查询并获得最多5个数据
public List<Major> fuzzyQueryMaxFive(String keyword) {
List<Major> majors = majorDao.fuzzyQuery(keyword);
List<Major> retMajors;
// 如果查询出的数据大于5，截取前5个数据,反之，直接获取全部
retMajors = majors.size() > 5 ? majors.subList(0, 4) : majors;
return retMajors;
}

}

四、控制层类

  （一）、类名前加注释：

                  @Controller

                @RequestMapping("xxx")

 

    (二)、激活需要使用的service类

              @Resource
      private MajorService majorService;

实例：

package com.cqvie.controller;

import java.util.List;

import javax.annotation.Resource;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.cqvie.model.Major;
import com.cqvie.model.School;
import com.cqvie.service.MajorService;
import com.cqvie.service.SchoolService;

@Controller
@RequestMapping("/major")
public class MajorController {
@Resource
private MajorService majorService;

// 模糊查询
@ResponseBody
@RequestMapping(value = "/fuzzyQueryMajor")
public List<Major> fuzzyQuerySchool(String keyword) {
return majorService.fuzzyQuery(keyword);
}

// 输入框的模糊匹配
@ResponseBody
@RequestMapping("/inputFuzzyQuery")
public List<Major> inputFuzzyQuery(String keyword) {
return majorService.fuzzyQueryMaxFive(keyword);
}
}