c1

src/main/java/com/lessthread/twtnews/converter/NewsConverter.java

@@ -0,0 +1,21 @@
+package com.lessthread.twtnews.converter;
+
+import com.lessthread.twtnews.dao.News;
+import com.lessthread.twtnews.dto.NewsDTO;
+
+public class NewsConverter {
+    public static NewsDTO convertNews(News news) {
+        NewsDTO newsDTO = new NewsDTO();
+        newsDTO.setId(news.getId());
+        newsDTO.setTitle(news.getTitle());
+        newsDTO.setContent(news.getContent());
+        return newsDTO;
+    }
+
+    public static News convertNews(NewsDTO newsDTO) {
+        News news = new News();
+        news.setTitle(newsDTO.getTitle());
+        news.setContent(newsDTO.getContent());
+        return news;
+    }
+}

src/main/java/com/lessthread/twtnews/dao/NewsRepository.java

@@ -11,7 +11,6 @@ import java.util.List;
 @Repository
 public interface NewsRepository extends JpaRepository<News, Long>, JpaSpecificationExecutor<News> {
     // find支持的关键字， And , Between, In, StaringWith
-    List<News> findById(long Id);
 
     List<News> findByTitle(String title);
 

src/main/java/com/lessthread/twtnews/dto/NewsDTO.java

@@ -0,0 +1,38 @@
+package com.lessthread.twtnews.dto;
+
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.time.Instant;
+
+@Builder
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class NewsDTO {
+
+    private long id;
+    private String title;
+    private String content;
+    private Instant time;
+    private int author;
+
+    public String getTitle(){
+        return title;
+    }
+
+    public void setTitle(String title){
+        this.title = title;
+    }
+
+    public String getContent(){
+        return content;
+    }
+
+    public void setConent(String content){
+        this.content = content;
+    }
+}

src/main/java/com/lessthread/twtnews/service/NewsService.java

@@ -0,0 +1,18 @@
+package com.lessthread.twtnews.service;
+
+import com.lessthread.twtnews.dao.News;
+import com.lessthread.twtnews.dto.NewsDTO;
+
+import java.util.List;
+
+public interface NewsService {
+    NewsDTO getNewsById(long id);
+
+    Long addNews(NewsDTO newsDTO);
+
+    void deleteNewsById(long id);
+
+    NewsDTO updateNewsById(long id,String title,String content);
+
+    List<NewsDTO> getAllNews();
+}

src/main/java/com/lessthread/twtnews/service/NewsServiceImpl.java

@@ -0,0 +1,50 @@
+package com.lessthread.twtnews.service;
+
+import com.lessthread.twtnews.dao.News;
+import com.lessthread.twtnews.dao.NewsRepository;
+import com.lessthread.twtnews.dto.NewsDTO;
+import com.lessthread.twtnews.converter.NewsConverter;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.util.CollectionUtils;
+import org.springframework.util.StringUtils;
+
+
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+@Service
+public class NewsServiceImpl implements NewsService{
+
+    @Autowired
+    private NewsRepository newsRepository;
+
+    @Override
+    public NewsDTO getNewsById(long id){
+        News news = newsRepository.findById(id).orElseThrow(RuntimeException::new);
+        return NewsConverter.convertNews(news);
+    }
+
+    @Override
+    public Long addNews(NewsDTO newsDTO) {
+        return null;
+    }
+
+    @Override
+    public void deleteNewsById(long id) {
+
+    }
+
+    @Override
+    public NewsDTO updateNewsById(long id, String title, String content) {
+        return null;
+    }
+
+    @Override
+    public List<NewsDTO> getAllNews() {
+        return null;
+    }
+}

src/main/java/com/lessthread/twtnews/utils/Response.java

@@ -0,0 +1,46 @@
+package com.lessthread.twtnews.utils;
+
+public class Response <T> {
+
+    private T data;
+    private boolean success;
+    private String errorMsg;
+
+    public static <K> Response<K> newSuccess(K data) {
+        Response<K> response = new Response<>();
+        response.setData(data);
+        response.setSuccess(true);
+        return response;
+    }
+
+    public static Response<Void> newFail(String errorMsg) {
+        Response<Void> response = new Response<>();
+        response.setErrorMsg(errorMsg);
+        response.setSuccess(false);
+        return response;
+    }
+
+    public T getData() {
+        return data;
+    }
+
+    public void setData(T data) {
+        this.data = data;
+    }
+
+    public boolean isSuccess() {
+        return success;
+    }
+
+    public void setSuccess(boolean success) {
+        this.success = success;
+    }
+
+    public String getErrorMsg() {
+        return errorMsg;
+    }
+
+    public void setErrorMsg(String errorMsg) {
+        this.errorMsg = errorMsg;
+    }
+}