Spring Boot利用Spring Data JPA实现排序与分页查询实战(附源码，超详细）

在实际开发场景中，排序与分页查询是必须的，幸运的是Spring Data JPA充分考虑了排序与分页查询的场景，为我们提供Sort类 Page接口 Pageable接口 下面通过一个实战来阐明

1：创建持久化实体类

创建名为com.ch.ch6_4.entity的包 并在该包中创建名为Article和Author的持久化实体类

代码如下

Article

package com.ch.ch6_2.entity;
import java.io.Serializable;
import javax.persistence.Basic;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.Lob;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
import javax.validation.constraints.NotEmpty;
import javax.validation.constraints.Size;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
@Entity
@Table(name = "article_table")
@JsonIgnoreProperties(value = { "hibernateLazyInitializer"})
public class Article  implements Serializable{
	private static final long serialVersionUID = 1L;
	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	private int id;
	//标题
	@NotEmpty(message = "标题不能为空")
    @Size(min = 2, max = 50)
    @Column(nullable = false, length = 50) 
    private String title;
	//文章内容
    @Lob  //大对象，映射 为MySQL的Long文本类型
    @Basic(fetch = FetchType.LAZY) 
    @NotEmpty(message = "内容不能为空")
    @Size(min = 2)
    @Column(nullable = false) 
    private String content;
    //所属作者，文章与作者是多对一的关系
    @ManyToOne(cascade={CascadeType.MERGE,CascadeType.REFRESH},optional=false)
    //可选属性optional=false,表示author不能为空。删除文章，不影响用户
    @JoinColumn(name="id_author_id")//设置在article表中的关联字段(外键)
    @JsonIgnore
    private Author author;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = i