Spring 引导不生成 json 并显示白页

Question

我用 sql 服务器做了一个简单的列表，但它没有显示结果，只显示了白页。我在控制台中没有错误。 sql 服务器 2017 会是吗？请帮忙？

连接到 sql 服务器 2017

spring.datasource.driver-class-name=com.microsoft.sqlserver.jdbc.SQLServerDriver
spring.datasource.url=jdbc:sqlserver://localhost;databaseName=DB_PRUEBA_V1;integratedSecurity=true
spring.jpa.show-sql=true
#spring.jpa.hibernate.ddl-auto=update
server.port=8090

打包应用程序

package app;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ProyectoV2Application {

    public static void main(String[] args) {
        SpringApplication.run(ProyectoV2Application.class, args);
    }
}

套餐型号

package model;

import java.io.Serializable;

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

@Entity
@Table(name = "TB_USERS")
public class Users implements Serializable{

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "COD_USER")
    private int codUser;
    @Column(name = "NOM_USER")
    private String nomUser;
    @Column(name = "EMA_USER")
    private String emUser;

    public int getCodUser() {
        return codUser;
    }
    public void setCodUser(int codUser) {
        this.codUser = codUser;
    }
    public String getNomUser() {
        return nomUser;
    }
    public void setNomUser(String nomUser) {
        this.nomUser = nomUser;
    }
    public String getEmUser() {
        return emUser;
    }
    public void setEmUser(String emUser) {
        this.emUser = emUser;
    }

}

软件包存储库

package repository;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

import model.Users;

@Repository
public interface UserDAO extends JpaRepository<Users, Integer>{

}

服务

package service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import model.Users;
import repository.UserDAO;

@Service
public class UserService {
    @Autowired
    private UserDAO dao;

    public List<Users> lista(){
        return dao.findAll();
    }
}

包控制器

package controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import model.Users;
import service.UserService;

@RestController
@RequestMapping(value = "/CrudUsers")
public class UserController {
    @Autowired
    private UserService us;

    @ResponseBody
    @GetMapping(path = "/lista", produces = MediaType.APPLICATION_JSON_VALUE)
    public List<Users> lista(){
        return us.lista();
    }
}

Whitelabel Error Page

Answer 1

因为您在不同的包中创建了每个 class，如下所示，

app --> ProyectoV2Application

model --> Users

repository --> UserDAO

service --> UserService

controller --> UserController

但是spring boot 会扫描根包或者根包的子包中的classes，所以将所有这些classes 移动到根包的子包中

app --> ProyectoV2Application

app.model --> Users

app.repository --> UserDAO

app.service --> UserService

app.controller --> UserController

Spring 引导不生成 json 并显示白页

Spring boot does not generate the json and shows me the white page

java

spring-boot

sql-server-2017