dao:
package com.tensquare.base.dao;import com.tensquare.base.pojo.Lable;import org.springframework.data.jpa.repository.JpaRepository;import org.springframework.data.jpa.repository.JpaSpecificationExecutor;public interface LableDao extends JpaRepository<Lable,String>, JpaSpecificationExecutor<Lable> {}
service：
/** * 动态条件构建 提取出单独的方法 为了方便调用 * @param * @return */private Specification<Lable> createSpecification(Lable lable) { return new Specification<Lable>() { @Override public Predicate toPredicate(Root<Lable> root, CriteriaQuery<?> query, CriteriaBuilder cb) { //用于暂时存放查询条件的集合 ArrayList<Predicate> list = new ArrayList<>(); if (lable.getLabelname()!=null&&!"".equals(lable.getLabelname())){ Predicate predicate = cb.like(root.get("labelname"), "%" + lable.getLabelname() + "%");//where labelname like %xxx% list.add(predicate); } if (lable.getState()!=null&&!"".equals(lable.getState())){ Predicate predicate = cb.equal(root.get("state"), lable.getState() );//where state = xxx list.add(predicate); } //最终将查询条件拼好然后return Predicate[] predicates = new Predicate[list.size()]; return cb.and( list.toArray(predicates));//where labelname like %xxx% and state = xxx } };}不分页：
public List<Lable> findSearch(Lable lable) { //Spring Data JPA使用JpaSpecificationExecutor构建条件查询 return lableDao.findAll(createSpecification(lable));}分页：public Page<Lable> pageQuery(int pageNum, int size, Lable lable) { //封装分页对象 Pageable pageable = PageRequest.of(pageNum - 1, size); return lableDao.findAll(createSpecification(lable),pageable);}controller：
@RequestMapping(value = "/search",method = RequestMethod.POST)public Result findSearch(@RequestBody Lable lable){ List<Lable> lables = lableService.findSearch(lable); return new Result(true,StatusCode.OK,"查询成功",lables);}@RequestMapping(value = "/search/{pageNum}/{size}",method = RequestMethod.POST)public Result pageQuery(@PathVariable int pageNum,@PathVariable int size,@RequestBody Lable lable){ Page<Lable> pages = lableService.pageQuery(pageNum,size,lable); return new Result(true,StatusCode.OK,"查询成功",new PageResult<Lable>(pages.getTotalElements(),pages.getContent()));}
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