在java spring boot应用程序中将projectionlist转换为json格式

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
</dependency>

public class ProjectionResult {
    private String field1;
    private int field2;
    // 其他字段

    // 构造函数、getter和setter方法
}

import org.hibernate.criterion.ProjectionList;
import org.hibernate.criterion.Projections;
import org.hibernate.transform.Transformers;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import java.util.List;

@RestController
public class MyController {
    @PersistenceContext
    private EntityManager entityManager;

    @GetMapping("/projection")
    public List<ProjectionResult> getProjectionResult() {
        ProjectionList projectionList = Projections.projectionList();
        projectionList.add(Projections.property("field1"), "field1");
        projectionList.add(Projections.property("field2"), "field2");
        // 添加其他字段

        List<ProjectionResult> results = entityManager
                .createCriteria(YourEntity.class)
                .setProjection(projectionList)
                .setResultTransformer(Transformers.aliasToBean(ProjectionResult.class))
                .list();

        return results;
    }
}