Spring JPA 部分字段更新，灵活控制字段更新、支持（设定：可更新字段、不可更新字段）

Spring JPA 部分字段更新，灵活控制字段更新、支持（设定：可更新字段、不可更新字段）

目录

一、创建 实体类 User.java 

二、编写基础 BaseRepository.class 

三、编写 UserRepository.class  继承  BaseRepository

四、创建 BaseService.class 

五、创建 UserService 继承 BaseService

业务代码：

六、UserService 进行编写业务代码

七、创建控制器调用 测试

---

一、创建 实体类 User.java 

package com.example.demo.entity;

import lombok.Data;
import org.hibernate.annotations.DynamicUpdate;

import javax.persistence.*;

@Data
@Entity
@Table(name = "po_system_user")
@DynamicUpdate
public class User {
    /** 版本号 */
    private static final long serialVersionUID = -4011850649077119561L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;
    private String username;
    private String password;
    private String nick;
    private String mobile;
    private String email;
    private String auth;
    private int iframe;
    private String theme;
    private int status;
    @Column(name = "last_login_ip")
    private String lastLoginIp;
    @Column(name = "last_login_time")
    private int lastLoginTime;
    private int ctime;
    private int mtime;
}

二、编写基础 BaseRepository.class 

package com.example.demo.repository;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
import org.springframework.data.querydsl.QuerydslPredicateExecutor;
import org.springframework.data.repository.NoRepositoryBean;

import java.io.Serializable;

@NoRepositoryBean
public interface BaseRepository  extends JpaRepository, JpaSpecificationExecutor, QuerydslPredicateExecutor {
}

三、编写 UserRepository.class  继承  BaseRepository

package com.example.demo.repository;

import com.example.demo.entity.User;
import org.springframework.stereotype.Repository;

@Repository
public interface UserRepository extends BaseRepository {
}

四、创建 BaseService.class 

package com.example.demo.service;


import com.example.demo.repository.BaseRepository;

import java.io.Serializable;

public abstract class BaseService, T, ID extends Serializable> {
}

五、创建 UserService 继承 BaseService

package com.example.demo.service;

import com.example.demo.entity.User;
import com.example.demo.repository.UserRepository;
import org.springframework.stereotype.Service;

@Service
public class UserService extends BaseService {

}

以上五步基本文件关系创建，文件目录关系（见图-1）

编写业务代码：

---

 六、UserService 进行编写业务代码

package com.example.demo.service;

import com.example.demo.entity.User;
import com.example.demo.repository.UserRepository;
import com.example.demo.util.JpaUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.Optional;

@Service
public class UserService extends BaseService {

    @Autowired
    UserRepository userRepository;

    public User saveUser(User data) {
        User save = null;
        Optional selectData = userRepository.findById(data.getId());
        if (selectData.isPresent()) {
            String[] Field = {"nick", "theme"};  //更新 Field指定允许字段
            JpaUtil.copyNotNullPropertiesAllow(data, selectData.get(), Field);
            save = userRepository.save(selectData.get());
        } else {
            userRepository.save(data); //新增
        }
        return save;
    }
}

七、创建控制器调用 测试

package com.example.demo.controller;

import com.example.demo.entity.User;
import com.example.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@Controller
@RequestMapping("/")
public class IndexController {

    @Autowired
    UserService userService;

    @GetMapping("index")
    public  void index() {
	   User data = new User();
		data.setId(1);
		data.setNick("只更新，允许的字段");
		userService.saveUser(data);

    }
}

访问测试：http://127.0.0.1:9011/index  ，控制台输出如下： 

pom.xml  配置

---

	4.0.0
	
		org.springframework.boot
		spring-boot-starter-parent
		2.3.1.RELEASE
		 
	
	com.weijuhe
	wjh
	0.0.1
	war
	demo
	Demo project for Spring Boot

	
		1.8
	

	
		
			org.springframework.boot
			spring-boot-starter-data-jpa
		
		
			org.springframework.boot
			spring-boot-starter-web
		

		
			mysql
			mysql-connector-java
			runtime
		

		
			org.projectlombok
			lombok
			1.16.20
			provided
		

		
			org.springframework.boot
			spring-boot-starter-test
			test
			
				
					org.junit.vintage
					junit-vintage-engine
				
			
		

		
		
			com.querydsl
			querydsl-apt
			provided
		
		
			com.querydsl
			querydsl-jpa
		
		

		
		
			org.springframework.boot
			spring-boot-starter-test
		
		
	

	
		
			
				org.springframework.boot
				spring-boot-maven-plugin
			
			
			
				com.mysema.maven
				apt-maven-plugin
				1.1.3
				
					
						
							process
						
						
							target/generated-sources/java
							com.querydsl.apt.jpa.JPAAnnotationProcessor
						
					
				
			
			
		
	

 

 

工具类文件  JpaUtil

package com.example.demo.util;

import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

public class JpaUtil {


    /**
     * @param src
     * @param target
     * @name 排除指定字段
     */
    public static void copyNotNullPropertiesExclude(Object src, Object target, String[] Field) {
        BeanUtils.copyProperties(src, target, getNullPropertyNames(src, Field, true));
    }

    /**
     * @param src
     * @param target
     * @name 允许指定字段
     */
    public static void copyNotNullPropertiesAllow(Object src, Object target, String[] excludeField) {
        BeanUtils.copyProperties(src, target, getNullPropertyNames(src, excludeField, false));
    }


    /**
     * @param src
     * @param target
     * @name 允许指定字段
     */
    public static void copyPropertiesAllow(Object src, Object target, String[] excludeField) {
        BeanUtils.copyProperties(src, target, getPropertyNames(src, excludeField, false));
    }

    /**
     * @param source
     * @return
     * @name 筛选忽略字段
     */
    public static String[] getNullPropertyNames(Object source, String[] excludeField, boolean tag) {
        String[] result = null;
        final BeanWrapper src = new BeanWrapperImpl(source);
        java.beans.PropertyDescriptor[] pds = src.getPropertyDescriptors();
        Set emptyNames = new HashSet();
        for (java.beans.PropertyDescriptor pd : pds) {
            if (pd.getName().equals("baseData")) {
                continue;
            } else {
                Object srcValue = src.getPropertyValue(pd.getName());
                //pd.getName() , 存在 Allow ,Exclude
                boolean contains = Arrays.asList(excludeField).contains(pd.getName());
                if (srcValue == null || contains == tag) {
                    emptyNames.add(pd.getName());
                }
            }
        }
        result = new String[emptyNames.size()];
        return emptyNames.toArray(result);
    }



    /**
     * @param source
     * @return
     * @name 筛选忽略字段 ， 不去掉null
     */
    public static String[] getPropertyNames(Object source, String[] excludeField, boolean tag) {
        String[] result = null;
        final BeanWrapper src = new BeanWrapperImpl(source);
        java.beans.PropertyDescriptor[] pds = src.getPropertyDescriptors();
        Set emptyNames = new HashSet();
        for (java.beans.PropertyDescriptor pd : pds) {
            if (pd.getName().equals("baseData")) {
                continue;
            } else {
                Object srcValue = src.getPropertyValue(pd.getName());
                //pd.getName() , 存在 Allow ,Exclude
                boolean contains = Arrays.asList(excludeField).contains(pd.getName());
                if (contains == tag) {
                    emptyNames.add(pd.getName());
                }
            }
        }
        result = new String[emptyNames.size()];
        return emptyNames.toArray(result);
    }
}