From c24c68ecaf3e1827ee6d895c5812665d6da7f063 Mon Sep 17 00:00:00 2001 From: xiongxiaoyang <1179705413@qq.com> Date: Fri, 25 Jul 2025 17:03:46 +0800 Subject: [PATCH] =?UTF-8?q?perf:=20=E4=BC=98=E5=8C=96=E7=BC=93=E5=AD=98?= =?UTF-8?q?=E6=A8=A1=E5=9D=97?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 提升可读性 & 减小内存占用 --- .../controller/FriendLinkController.java | 4 +- .../novel/controller/NewsController.java | 4 +- .../java2nb/novel/core/cache/CacheKey.java | 2 +- .../novel/core/cache/CacheService.java | 86 ++++++++++--------- .../core/cache/impl/RedisServiceImpl.java | 62 +++++++++++-- .../novel/controller/CrawlController.java | 8 +- .../java2nb/novel/core/crawl/CrawlParser.java | 1 - .../novel/controller/BookController.java | 2 +- .../novel/controller/page/PageController.java | 2 +- .../java2nb/novel/service/BookService.java | 5 +- .../novel/service/impl/BookServiceImpl.java | 34 ++++---- .../service/impl/FriendLinkServiceImpl.java | 21 +++-- .../novel/service/impl/LikeServiceImpl.java | 32 +++---- .../novel/service/impl/NewsServiceImpl.java | 40 ++++----- 14 files changed, 173 insertions(+), 130 deletions(-) diff --git a/novel-admin/src/main/java/com/java2nb/novel/controller/FriendLinkController.java b/novel-admin/src/main/java/com/java2nb/novel/controller/FriendLinkController.java index dd86893..0847fc4 100644 --- a/novel-admin/src/main/java/com/java2nb/novel/controller/FriendLinkController.java +++ b/novel-admin/src/main/java/com/java2nb/novel/controller/FriendLinkController.java @@ -9,7 +9,7 @@ import com.java2nb.novel.service.FriendLinkService; import io.swagger.annotations.ApiOperation; import org.apache.shiro.authz.annotation.RequiresPermissions; import org.springframework.beans.factory.annotation.Autowired; -import org.springframework.data.redis.core.RedisTemplate; +import org.springframework.data.redis.core.StringRedisTemplate; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.validation.annotation.Validated; @@ -31,7 +31,7 @@ public class FriendLinkController { @Autowired private FriendLinkService friendLinkService; @Autowired - private RedisTemplate redisTemplate; + private StringRedisTemplate redisTemplate; @GetMapping() @RequiresPermissions("novel:friendLink:friendLink") diff --git a/novel-admin/src/main/java/com/java2nb/novel/controller/NewsController.java b/novel-admin/src/main/java/com/java2nb/novel/controller/NewsController.java index 04231b3..c1a78d4 100644 --- a/novel-admin/src/main/java/com/java2nb/novel/controller/NewsController.java +++ b/novel-admin/src/main/java/com/java2nb/novel/controller/NewsController.java @@ -9,7 +9,7 @@ import com.java2nb.novel.service.NewsService; import io.swagger.annotations.ApiOperation; import org.apache.shiro.authz.annotation.RequiresPermissions; import org.springframework.beans.factory.annotation.Autowired; -import org.springframework.data.redis.core.RedisTemplate; +import org.springframework.data.redis.core.StringRedisTemplate; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.*; @@ -32,7 +32,7 @@ public class NewsController { @Autowired private NewsService newsService; @Autowired - private RedisTemplate redisTemplate; + private StringRedisTemplate redisTemplate; @GetMapping() @RequiresPermissions("novel:news:news") diff --git a/novel-common/src/main/java/com/java2nb/novel/core/cache/CacheKey.java b/novel-common/src/main/java/com/java2nb/novel/core/cache/CacheKey.java index d1b5811..457b50d 100644 --- a/novel-common/src/main/java/com/java2nb/novel/core/cache/CacheKey.java +++ b/novel-common/src/main/java/com/java2nb/novel/core/cache/CacheKey.java @@ -8,7 +8,7 @@ public interface CacheKey { /** * 首页小说设置 * */ - String INDEX_BOOK_SETTINGS_KEY = "indexBookSettingsKey"; + String INDEX_BOOK_SETTINGS_KEY = "indexBookSettingsKey:v2"; /** * 首页新闻 diff --git a/novel-common/src/main/java/com/java2nb/novel/core/cache/CacheService.java b/novel-common/src/main/java/com/java2nb/novel/core/cache/CacheService.java index 05d7423..480fee0 100644 --- a/novel-common/src/main/java/com/java2nb/novel/core/cache/CacheService.java +++ b/novel-common/src/main/java/com/java2nb/novel/core/cache/CacheService.java @@ -1,55 +1,61 @@ package com.java2nb.novel.core.cache; +import com.fasterxml.jackson.core.JsonProcessingException; + +import java.util.List; + /** * @author 11797 */ public interface CacheService { - /** - * 根据key获取缓存的String类型数据 - */ - String get(String key); + /** + * 根据key获取缓存的String类型数据 + */ + String get(String key); - /** - * 设置String类型的缓存 - */ - void set(String key, String value); + /** + * 设置String类型的缓存 + */ + void set(String key, String value); - /** - * 设置一个有过期时间的String类型的缓存,单位秒 - */ - void set(String key, String value, long timeout); - - /** - * 根据key获取缓存的Object类型数据 - */ - Object getObject(String key); - - /** - * 设置Object类型的缓存 - */ - void setObject(String key, Object value); - - /** - * 设置一个有过期时间的Object类型的缓存,单位秒 - */ + /** + * 设置一个有过期时间的String类型的缓存,单位秒 + */ + void set(String key, String value, long timeout); + + /** + * 根据key获取缓存的Object类型数据 + */ + T getObject(String key, Class clazz); + + List getList(String key, Class clazz); + + /** + * 设置Object类型的缓存 + */ + void setObject(String key, Object value); + + /** + * 设置一个有过期时间的Object类型的缓存,单位秒 + */ void setObject(String key, Object value, long timeout); - /** - * 根据key删除缓存的数据 - */ - void del(String key); + /** + * 根据key删除缓存的数据 + */ + void del(String key); - - /** - * 判断是否存在一个key - * */ - boolean contains(String key); - - /** - * 设置key过期时间 - * */ - void expire(String key, long timeout); + + /** + * 判断是否存在一个key + */ + boolean contains(String key); + + /** + * 设置key过期时间 + */ + void expire(String key, long timeout); } diff --git a/novel-common/src/main/java/com/java2nb/novel/core/cache/impl/RedisServiceImpl.java b/novel-common/src/main/java/com/java2nb/novel/core/cache/impl/RedisServiceImpl.java index aad1a04..ad16d29 100644 --- a/novel-common/src/main/java/com/java2nb/novel/core/cache/impl/RedisServiceImpl.java +++ b/novel-common/src/main/java/com/java2nb/novel/core/cache/impl/RedisServiceImpl.java @@ -1,23 +1,35 @@ package com.java2nb.novel.core.cache.impl; +import com.fasterxml.jackson.annotation.JsonInclude; +import com.fasterxml.jackson.core.JsonProcessingException; +import com.fasterxml.jackson.databind.ObjectMapper; import com.java2nb.novel.core.cache.CacheService; +import jakarta.annotation.PostConstruct; import lombok.RequiredArgsConstructor; -import org.springframework.data.redis.core.RedisTemplate; +import lombok.extern.slf4j.Slf4j; import org.springframework.data.redis.core.StringRedisTemplate; import org.springframework.stereotype.Service; +import java.util.List; import java.util.concurrent.TimeUnit; /** * @author xxy */ +@Slf4j @RequiredArgsConstructor @Service public class RedisServiceImpl implements CacheService { private final StringRedisTemplate stringRedisTemplate; - private final RedisTemplate redisTemplate; + private ObjectMapper objectMapper; + + @PostConstruct + public void init() { + objectMapper = new ObjectMapper(); + objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL); + } @Override @@ -37,34 +49,66 @@ public class RedisServiceImpl implements CacheService { } @Override - public Object getObject(String key) { - return redisTemplate.opsForValue().get(key); + public T getObject(String key, Class clazz) { + String result = get(key); + if (result != null) { + try { + return objectMapper.readValue(result, clazz); + } catch (JsonProcessingException e) { + throw new RuntimeException(e); + } + } + return null; + } + + @Override + public List getList(String key, Class clazz) { + String result = get(key); + if (result != null) { + try { + return objectMapper.readValue(result, + objectMapper.getTypeFactory().constructCollectionType(List.class, clazz)); + } catch (JsonProcessingException e) { + throw new RuntimeException(e); + } + } + return null; } @Override public void setObject(String key, Object value) { - redisTemplate.opsForValue().set(key, value); + if (value != null) { + try { + set(key, objectMapper.writeValueAsString(value)); + } catch (JsonProcessingException e) { + throw new RuntimeException(e); + } + } } @Override public void setObject(String key, Object value, long timeout) { - redisTemplate.opsForValue().set(key, value, timeout, TimeUnit.SECONDS); + if (value != null) { + try { + set(key, objectMapper.writeValueAsString(value), timeout); + } catch (JsonProcessingException e) { + throw new RuntimeException(e); + } + } } @Override public void del(String key) { - redisTemplate.delete(key); stringRedisTemplate.delete(key); } @Override public boolean contains(String key) { - return redisTemplate.hasKey(key) || stringRedisTemplate.hasKey(key); + return stringRedisTemplate.hasKey(key); } @Override public void expire(String key, long timeout) { - redisTemplate.expire(key, timeout, TimeUnit.SECONDS); stringRedisTemplate.expire(key, timeout, TimeUnit.SECONDS); } diff --git a/novel-crawl/src/main/java/com/java2nb/novel/controller/CrawlController.java b/novel-crawl/src/main/java/com/java2nb/novel/controller/CrawlController.java index 84f8de0..fefffec 100644 --- a/novel-crawl/src/main/java/com/java2nb/novel/controller/CrawlController.java +++ b/novel-crawl/src/main/java/com/java2nb/novel/controller/CrawlController.java @@ -72,17 +72,15 @@ public class CrawlController { if(url.startsWith("https://")||url.startsWith("http://")){ String refreshCache="1"; if(!refreshCache.equals(isRefresh)) { - Object cache = cacheService.getObject(CacheKey.BOOK_TEST_PARSE + url); - if (cache == null) { + html = cacheService.get(CacheKey.BOOK_TEST_PARSE + url); + if (html == null) { isRefresh="1"; - }else { - html = (String) cache; } } if(refreshCache.equals(isRefresh)){ html = HttpUtil.getByHttpClientWithChrome(url); if (html != null) { - cacheService.setObject(CacheKey.BOOK_TEST_PARSE + url, html, 60 * 10); + cacheService.set(CacheKey.BOOK_TEST_PARSE + url, html, 60 * 10); }else{ resultMap.put("msg","html is null"); return RestResult.ok(resultMap); diff --git a/novel-crawl/src/main/java/com/java2nb/novel/core/crawl/CrawlParser.java b/novel-crawl/src/main/java/com/java2nb/novel/core/crawl/CrawlParser.java index 1cb6aaf..1a7971c 100644 --- a/novel-crawl/src/main/java/com/java2nb/novel/core/crawl/CrawlParser.java +++ b/novel-crawl/src/main/java/com/java2nb/novel/core/crawl/CrawlParser.java @@ -12,7 +12,6 @@ import io.github.xxyopen.util.IdWorker; import lombok.RequiredArgsConstructor; import lombok.extern.slf4j.Slf4j; import org.apache.commons.lang3.StringUtils; -import org.springframework.data.redis.core.RedisTemplate; import org.springframework.data.redis.core.StringRedisTemplate; import org.springframework.stereotype.Component; diff --git a/novel-front/src/main/java/com/java2nb/novel/controller/BookController.java b/novel-front/src/main/java/com/java2nb/novel/controller/BookController.java index 3d86237..d10d2a7 100644 --- a/novel-front/src/main/java/com/java2nb/novel/controller/BookController.java +++ b/novel-front/src/main/java/com/java2nb/novel/controller/BookController.java @@ -43,7 +43,7 @@ public class BookController extends BaseController { * 查询首页小说设置列表数据 */ @GetMapping("listBookSetting") - public RestResult>> listBookSetting() { + public RestResult>> listBookSetting() { return RestResult.ok(bookService.listBookSettingVO()); } diff --git a/novel-front/src/main/java/com/java2nb/novel/controller/page/PageController.java b/novel-front/src/main/java/com/java2nb/novel/controller/page/PageController.java index 11b9e14..26584c0 100644 --- a/novel-front/src/main/java/com/java2nb/novel/controller/page/PageController.java +++ b/novel-front/src/main/java/com/java2nb/novel/controller/page/PageController.java @@ -82,7 +82,7 @@ public class PageController extends BaseController { @RequestMapping(path = {"/", "/index", "/index.html"}) public String index(Model model) { //加载小说首页小说基本信息线程 - CompletableFuture>> bookCompletableFuture = CompletableFuture.supplyAsync( + CompletableFuture>> bookCompletableFuture = CompletableFuture.supplyAsync( bookService::listBookSettingVO, threadPoolExecutor); //加载首页新闻线程 CompletableFuture> newsCompletableFuture = CompletableFuture.supplyAsync(newsService::listIndexNews, diff --git a/novel-front/src/main/java/com/java2nb/novel/service/BookService.java b/novel-front/src/main/java/com/java2nb/novel/service/BookService.java index 900ebca..b150092 100644 --- a/novel-front/src/main/java/com/java2nb/novel/service/BookService.java +++ b/novel-front/src/main/java/com/java2nb/novel/service/BookService.java @@ -16,9 +16,10 @@ public interface BookService { /** * 查询首页小说设置列表数据 + * * @return - * */ - Map> listBookSettingVO(); + */ + Map> listBookSettingVO(); /** * 查询首页点击榜单数据 diff --git a/novel-front/src/main/java/com/java2nb/novel/service/impl/BookServiceImpl.java b/novel-front/src/main/java/com/java2nb/novel/service/impl/BookServiceImpl.java index a322497..ab917e4 100644 --- a/novel-front/src/main/java/com/java2nb/novel/service/impl/BookServiceImpl.java +++ b/novel-front/src/main/java/com/java2nb/novel/service/impl/BookServiceImpl.java @@ -1,6 +1,5 @@ package com.java2nb.novel.service.impl; -import com.fasterxml.jackson.databind.ObjectMapper; import com.github.pagehelper.PageHelper; import com.java2nb.novel.core.cache.CacheKey; import com.java2nb.novel.core.cache.CacheService; @@ -25,7 +24,6 @@ import io.github.xxyopen.web.util.BeanUtil; import lombok.RequiredArgsConstructor; import lombok.SneakyThrows; import lombok.extern.slf4j.Slf4j; -import org.apache.commons.lang3.StringUtils; import org.apache.http.client.utils.DateUtils; import org.mybatis.dynamic.sql.SortSpecification; import org.mybatis.dynamic.sql.render.RenderingStrategies; @@ -48,7 +46,6 @@ import java.util.concurrent.ThreadPoolExecutor; import java.util.stream.Collectors; import static com.java2nb.novel.mapper.BookCategoryDynamicSqlSupport.bookCategory; -import static com.java2nb.novel.mapper.BookCategoryDynamicSqlSupport.sort; import static com.java2nb.novel.mapper.BookCommentDynamicSqlSupport.bookComment; import static com.java2nb.novel.mapper.BookContentDynamicSqlSupport.bookContent; import static com.java2nb.novel.mapper.BookContentDynamicSqlSupport.content; @@ -108,19 +105,19 @@ public class BookServiceImpl implements BookService { @SneakyThrows @Override - public Map> listBookSettingVO() { - String result = cacheService.get(CacheKey.INDEX_BOOK_SETTINGS_KEY); - if (result == null || result.length() < Constants.OBJECT_JSON_CACHE_EXIST_LENGTH) { - List list = bookSettingMapper.listVO(); - if (list.size() == 0) { + public Map> listBookSettingVO() { + List list = cacheService.getList(CacheKey.INDEX_BOOK_SETTINGS_KEY, BookSettingVO.class); + if (list == null || list.isEmpty()) { + list = bookSettingMapper.listVO(); + if (list.isEmpty()) { //如果首页小说没有被设置，则初始化首页小说设置 list = initIndexBookSetting(); } - result = new ObjectMapper().writeValueAsString( - list.stream().collect(Collectors.groupingBy(BookSettingVO::getType))); - cacheService.set(CacheKey.INDEX_BOOK_SETTINGS_KEY, result, 3600 * 24); + cacheService.setObject(CacheKey.INDEX_BOOK_SETTINGS_KEY, list, 3600 * 24); } - return new ObjectMapper().readValue(result, Map.class); + return list.stream().collect( + Collectors.groupingBy(book -> book.getType().toString()) + ); } @@ -170,11 +167,10 @@ public class BookServiceImpl implements BookService { return new ArrayList<>(0); } - @Override public List listClickRank() { - List result = (List) cacheService.getObject(CacheKey.INDEX_CLICK_BANK_BOOK_KEY); - if (result == null || result.size() == 0) { + List result = cacheService.getList(CacheKey.INDEX_CLICK_BANK_BOOK_KEY, Book.class); + if (result == null || result.isEmpty()) { result = listRank((byte) 0, 10); cacheService.setObject(CacheKey.INDEX_CLICK_BANK_BOOK_KEY, result, 5000); } @@ -183,8 +179,8 @@ public class BookServiceImpl implements BookService { @Override public List listNewRank() { - List result = (List) cacheService.getObject(CacheKey.INDEX_NEW_BOOK_KEY); - if (result == null || result.size() == 0) { + List result = cacheService.getList(CacheKey.INDEX_NEW_BOOK_KEY, Book.class); + if (result == null || result.isEmpty()) { result = listRank((byte) 1, 10); cacheService.setObject(CacheKey.INDEX_NEW_BOOK_KEY, result, 3600); } @@ -193,8 +189,8 @@ public class BookServiceImpl implements BookService { @Override public List listUpdateRank() { - List result = (List) cacheService.getObject(CacheKey.INDEX_UPDATE_BOOK_KEY); - if (result == null || result.size() == 0) { + List result = cacheService.getList(CacheKey.INDEX_UPDATE_BOOK_KEY, BookVO.class); + if (result == null || result.isEmpty()) { List bookPOList = listRank((byte) 2, 23); result = BeanUtil.copyList(bookPOList, BookVO.class); cacheService.setObject(CacheKey.INDEX_UPDATE_BOOK_KEY, result, 60 * 10); diff --git a/novel-front/src/main/java/com/java2nb/novel/service/impl/FriendLinkServiceImpl.java b/novel-front/src/main/java/com/java2nb/novel/service/impl/FriendLinkServiceImpl.java index cea174d..55ff591 100644 --- a/novel-front/src/main/java/com/java2nb/novel/service/impl/FriendLinkServiceImpl.java +++ b/novel-front/src/main/java/com/java2nb/novel/service/impl/FriendLinkServiceImpl.java @@ -1,6 +1,5 @@ package com.java2nb.novel.service.impl; -import io.github.xxyopen.web.util.BeanUtil; import com.java2nb.novel.service.FriendLinkService; import com.java2nb.novel.core.cache.CacheKey; import com.java2nb.novel.core.cache.CacheService; @@ -31,16 +30,16 @@ public class FriendLinkServiceImpl implements FriendLinkService { @Override public List listIndexLink() { - List result = (List) cacheService.getObject(CacheKey.INDEX_LINK_KEY); - if(result == null || result.size() == 0) { - SelectStatementProvider selectStatement = select(linkName,linkUrl) - .from(friendLink) - .where(isOpen,isEqualTo((byte)1)) - .orderBy(sort) - .build() - .render(RenderingStrategies.MYBATIS3); - result = friendLinkMapper.selectMany(selectStatement); - cacheService.setObject(CacheKey.INDEX_LINK_KEY,result,60 * 60 * 24); + List result = cacheService.getList(CacheKey.INDEX_LINK_KEY, FriendLink.class); + if (result == null || result.isEmpty()) { + SelectStatementProvider selectStatement = select(linkName, linkUrl) + .from(friendLink) + .where(isOpen, isEqualTo((byte) 1)) + .orderBy(sort) + .build() + .render(RenderingStrategies.MYBATIS3); + result = friendLinkMapper.selectMany(selectStatement); + cacheService.setObject(CacheKey.INDEX_LINK_KEY, result, 60 * 60 * 24); } return result; } diff --git a/novel-front/src/main/java/com/java2nb/novel/service/impl/LikeServiceImpl.java b/novel-front/src/main/java/com/java2nb/novel/service/impl/LikeServiceImpl.java index 23498d6..94ecf18 100644 --- a/novel-front/src/main/java/com/java2nb/novel/service/impl/LikeServiceImpl.java +++ b/novel-front/src/main/java/com/java2nb/novel/service/impl/LikeServiceImpl.java @@ -4,7 +4,7 @@ import com.java2nb.novel.service.LikeService; import jakarta.annotation.PostConstruct; import lombok.RequiredArgsConstructor; import lombok.extern.slf4j.Slf4j; -import org.springframework.data.redis.core.RedisTemplate; +import org.springframework.data.redis.core.StringRedisTemplate; import org.springframework.data.redis.core.script.DefaultRedisScript; import org.springframework.scripting.support.StaticScriptSource; import org.springframework.stereotype.Service; @@ -20,7 +20,7 @@ import java.util.Collections; @Slf4j public class LikeServiceImpl implements LikeService { - private final RedisTemplate redisTemplate; + private final StringRedisTemplate redisTemplate; private DefaultRedisScript toggleLikeScript; @@ -33,19 +33,19 @@ public class LikeServiceImpl implements LikeService { public void init() { // Lua 脚本保证原子性操作 String script = """ - local key = KEYS[1] - local userId = ARGV[1] - - local isLiked = redis.call('SISMEMBER', key, userId) - - if isLiked == 1 then - redis.call('SREM', key, userId) - else - redis.call('SADD', key, userId) - end - - return redis.call('SCARD', key) - """; + local key = KEYS[1] + local userId = ARGV[1] + + local isLiked = redis.call('SISMEMBER', key, userId) + + if isLiked == 1 then + redis.call('SREM', key, userId) + else + redis.call('SADD', key, userId) + end + + return redis.call('SCARD', key) + """; toggleLikeScript = new DefaultRedisScript<>(); toggleLikeScript.setScriptSource(new StaticScriptSource(script)); @@ -89,6 +89,6 @@ public class LikeServiceImpl implements LikeService { } private Long executeToggle(String key, Long userId) { - return redisTemplate.execute(toggleLikeScript, Collections.singletonList(key), userId); + return redisTemplate.execute(toggleLikeScript, Collections.singletonList(key), String.valueOf(userId)); } } diff --git a/novel-front/src/main/java/com/java2nb/novel/service/impl/NewsServiceImpl.java b/novel-front/src/main/java/com/java2nb/novel/service/impl/NewsServiceImpl.java index ce4ba9c..8079c74 100644 --- a/novel-front/src/main/java/com/java2nb/novel/service/impl/NewsServiceImpl.java +++ b/novel-front/src/main/java/com/java2nb/novel/service/impl/NewsServiceImpl.java @@ -36,16 +36,16 @@ public class NewsServiceImpl implements NewsService { @Override public List listIndexNews() { - List result = (List) cacheService.getObject(CacheKey.INDEX_NEWS_KEY); - if(result == null || result.size() == 0) { - SelectStatementProvider selectStatement = select(id, catName, catId, title,createTime) - .from(news) - .orderBy(createTime.descending()) - .limit(2) - .build() - .render(RenderingStrategies.MYBATIS3); + List result = cacheService.getList(CacheKey.INDEX_NEWS_KEY, News.class); + if (result == null || result.isEmpty()) { + SelectStatementProvider selectStatement = select(id, catName, catId, title, createTime) + .from(news) + .orderBy(createTime.descending()) + .limit(2) + .build() + .render(RenderingStrategies.MYBATIS3); result = newsMapper.selectMany(selectStatement); - cacheService.setObject(CacheKey.INDEX_NEWS_KEY,result,60 * 60 * 12); + cacheService.setObject(CacheKey.INDEX_NEWS_KEY, result, 60 * 60 * 12); } return result; } @@ -53,25 +53,25 @@ public class NewsServiceImpl implements NewsService { @Override public News queryNewsInfo(Long newsId) { SelectStatementProvider selectStatement = select(news.allColumns()) - .from(news) - .where(id,isEqualTo(newsId)) - .build() - .render(RenderingStrategies.MYBATIS3); + .from(news) + .where(id, isEqualTo(newsId)) + .build() + .render(RenderingStrategies.MYBATIS3); return newsMapper.selectMany(selectStatement).get(0); } @Override public PageBean listByPage(int page, int pageSize) { - PageHelper.startPage(page,pageSize); - SelectStatementProvider selectStatement = select(id, catName, catId, title,createTime) - .from(news) - .orderBy(createTime.descending()) - .build() - .render(RenderingStrategies.MYBATIS3); + PageHelper.startPage(page, pageSize); + SelectStatementProvider selectStatement = select(id, catName, catId, title, createTime) + .from(news) + .orderBy(createTime.descending()) + .build() + .render(RenderingStrategies.MYBATIS3); List news = newsMapper.selectMany(selectStatement); PageBean pageBean = PageBuilder.build(news); - pageBean.setList(BeanUtil.copyList(news,NewsVO.class)); + pageBean.setList(BeanUtil.copyList(news, NewsVO.class)); return pageBean; }