diff --git a/src/com/hellogithub/dao/AdminDao.java b/src/com/hellogithub/dao/AdminDao.java
index f3c356f..f071027 100644
--- a/src/com/hellogithub/dao/AdminDao.java
+++ b/src/com/hellogithub/dao/AdminDao.java
@@ -45,6 +45,7 @@ public class AdminDao {
             QueryRunner runner = new QueryRunner();
             String sql="UPDATE admin SET loginTime = ? WHERE adminName= ? and isValid = 1";
             num = runner.update(conn,sql,loginTime,name);
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
@@ -127,6 +128,7 @@ public class AdminDao {
             QueryRunner runner = new QueryRunner();
             String sql="select * from admin";
             adminEntityList = runner.query(conn,sql,new BeanListHandler<>(adminEntity.class));
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
@@ -141,6 +143,7 @@ public class AdminDao {
             QueryRunner runner = new QueryRunner();
             String sql="update admin  set adminName = ? , adminPassword = ?, loginTime = ? ,isValid =? where adminId =? ";
             num = runner.update(conn,sql,adminName,  adminPassword,loginTime, isValid,adminId);
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
@@ -155,6 +158,7 @@ public class AdminDao {
             QueryRunner runner = new QueryRunner();
             String sql="delete from admin where adminId = ?";
             num = runner.update(conn,sql,id);
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
@@ -169,6 +173,7 @@ public class AdminDao {
             QueryRunner runner = new QueryRunner();
             String sql="UPDATE user SET isValid = ? WHERE userId = ?";
             num = runner.update(conn, sql, isvalid,id);
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
@@ -182,6 +187,7 @@ public class AdminDao {
             QueryRunner runner = new QueryRunner();
             String sql="UPDATE project SET isValid = ? WHERE userId = ?";
             num = runner.update(conn, sql, isvalid,id);
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
@@ -196,6 +202,7 @@ public class AdminDao {
             QueryRunner runner = new QueryRunner();
             String sql="UPDATE comment SET isValid = ? WHERE userId = ?";
             num = runner.update(conn, sql, isvalid,id);
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
@@ -210,6 +217,7 @@ public class AdminDao {
             QueryRunner runner = new QueryRunner();
             String sql="UPDATE category SET isValid = ? WHERE userId = ?";
             num = runner.update(conn, sql, isvalid,id);
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
@@ -224,6 +232,7 @@ public class AdminDao {
             QueryRunner runner = new QueryRunner();
             String sql="UPDATE article SET isValid = ? WHERE userId = ?";
             num = runner.update(conn, sql, isvalid,id);
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
@@ -238,6 +247,7 @@ public class AdminDao {
             QueryRunner runner = new QueryRunner();
             String sql="UPDATE admin SET isValid = ? WHERE userId = ?";
             num = runner.update(conn, sql, isvalid,id);
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
diff --git a/src/com/hellogithub/dao/articleDao.java b/src/com/hellogithub/dao/articleDao.java
index 43b465e..783af7a 100644
--- a/src/com/hellogithub/dao/articleDao.java
+++ b/src/com/hellogithub/dao/articleDao.java
@@ -222,6 +222,7 @@ public class articleDao {
             QueryRunner runner = new QueryRunner();
             String sql="select * from article";
             articleEntityList = runner.query(conn,sql,new BeanListHandler<>(articleEntity.class));
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
@@ -236,6 +237,7 @@ public class articleDao {
             QueryRunner runner = new QueryRunner();
             String sql="update article  set userId = ? , articleContent = ? , publishTime = ? ,isValid =?, readCount=?, articleTitle=?, articleIco=? where articleId =? ";
             num = runner.update(conn,sql,userId,  articleContent , publishTime , isValid, readCount, articleTitle, articleIco ,articleId);
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
@@ -250,6 +252,7 @@ public class articleDao {
             QueryRunner runner = new QueryRunner();
             String sql="delete from article where articleId = ?";
             num = runner.update(conn,sql,id);
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
diff --git a/src/com/hellogithub/dao/categoryDao.java b/src/com/hellogithub/dao/categoryDao.java
index f3f9b94..da51c9f 100644
--- a/src/com/hellogithub/dao/categoryDao.java
+++ b/src/com/hellogithub/dao/categoryDao.java
@@ -56,6 +56,7 @@ public class categoryDao {
             QueryRunner runner = new QueryRunner();
             String sql="select * from category ";
             categoryEntityList = runner.query(conn,sql,new BeanListHandler<>(categoryEntity.class));
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
@@ -70,6 +71,7 @@ public class categoryDao {
             QueryRunner runner = new QueryRunner();
             String sql="update category  set category = ? , categoryName = ?  ,isValid =? where categoryId =? ";
             num = runner.update(conn,sql,category,  categoryName, isValid,categoryId);
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
@@ -84,6 +86,7 @@ public class categoryDao {
             QueryRunner runner = new QueryRunner();
             String sql="delete from category where articleId = ?";
             num = runner.update(conn,sql,id);
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
diff --git a/src/com/hellogithub/dao/commentDao.java b/src/com/hellogithub/dao/commentDao.java
index c287bb9..65c295b 100644
--- a/src/com/hellogithub/dao/commentDao.java
+++ b/src/com/hellogithub/dao/commentDao.java
@@ -116,6 +116,7 @@ public class commentDao {
             QueryRunner runner = new QueryRunner();
             String sql="select * from comment ";
             commentEntityList = runner.query(conn,sql,new BeanListHandler<>(commentEntity.class));
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
@@ -130,6 +131,7 @@ public class commentDao {
             QueryRunner runner = new QueryRunner();
             String sql="update comment  set userId = ? , projectId = ? , content = ? ,isUsed =?, commentTime=?, isValid=?,star=?,likeNum=?where commentId =? ";
             num = runner.update(conn,sql,userId,  projectId , content , isUsed, commentTime, isValid, star, likeNum ,commentId);
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
@@ -144,6 +146,7 @@ public class commentDao {
             QueryRunner runner = new QueryRunner();
             String sql="delete from comment where commentId = ?";
             num = runner.update(conn,sql,id);
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
diff --git a/src/com/hellogithub/dao/githubDao.java b/src/com/hellogithub/dao/githubDao.java
index ff5315d..b261de7 100644
--- a/src/com/hellogithub/dao/githubDao.java
+++ b/src/com/hellogithub/dao/githubDao.java
@@ -67,6 +67,7 @@ public class githubDao {
             Connection conn = JdbcUtils.getConnection();
             QueryRunner runner = new QueryRunner();
             githubEntityList = runner.query(conn,sql,new BeanHandler<>(githubEntity.class),projectid);
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
diff --git a/src/com/hellogithub/dao/projectDao.java b/src/com/hellogithub/dao/projectDao.java
index 1113451..8c20a17 100644
--- a/src/com/hellogithub/dao/projectDao.java
+++ b/src/com/hellogithub/dao/projectDao.java
@@ -324,6 +324,7 @@ public class projectDao {
                 return 1;
             else
                 return 0;
+
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
@@ -343,6 +344,7 @@ public class projectDao {
             QueryRunner runner = new QueryRunner();
             String sql="select * from project ";
             projectEntityList = runner.query(conn,sql,new BeanListHandler<>(projectEntity.class));
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
@@ -357,6 +359,7 @@ public class projectDao {
             QueryRunner runner = new QueryRunner();
             String sql="update project  set userId = ? , projectName = ? , projectUrl = ? ,projectIco =?, projectTitle=?, projectDescription=?,startNum=?,submitTime=?,categoryId=?,isValid=? ,fileAddress = ? , periodicals = ? ,lookCount = ? where projectId =? ";
             num = runner.update(conn,sql,userId,  projectName , projectUrl , projectIco, projectTitle, projectDescription, startNum, submitTime ,categoryId,isValid,fileAddress,periodicals,lookCount,projectId);
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
@@ -375,6 +378,7 @@ public class projectDao {
             runner.update(conn,sql,id);
             sql="delete from project_category where projectId = ?";
             runner.update(conn,sql,id);
+            conn.close();
         } catch (SQLException e) {
             throw new RuntimeException(e);
         }
diff --git a/src/com/hellogithub/service/projectService.java b/src/com/hellogithub/service/projectService.java
index 4d54c6b..adb823e 100644
--- a/src/com/hellogithub/service/projectService.java
+++ b/src/com/hellogithub/service/projectService.java
@@ -195,21 +195,34 @@ public class projectService {
         long t = System.currentTimeMillis();
         Random random = new Random(t);
         List<projectEntity> projectEntityList1 = projectDao.retLatestProject();
-        Set<Integer> integers =new HashSet<>();
-        while(integers.size()<5){
-            int num = random.nextInt(projectEntityList1.size());
-            integers.add(num);
-        }
-        Iterator<Integer> it = integers.iterator();
-        while(it.hasNext())
+        if(projectEntityList1.size()<5)
         {
-            int id = it.next();
-            projectEntity projectEntity =projectEntityList1.get(id);
-            categoryEntity categoryEntity = categoryDao.retNum(projectEntity.getCategoryId());
-            projectEntity.setCategoryName(categoryEntity.getCategoryName());
-            projectEntityList.add(projectEntity);
+            for(int i=0;i<projectEntityList1.size();i++)
+            {
+                projectEntity projectEntity =projectEntityList1.get(i);
+                categoryEntity categoryEntity = categoryDao.retNum(projectEntity.getCategoryId());
+                projectEntityList1.get(i).setCategoryName(categoryEntity.getCategoryName());
+            }
+            projectEntityList = projectEntityList1;
+        }else{
+            Set<Integer> integers =new HashSet<>();
+            while(integers.size()<5){
+                int num = random.nextInt(projectEntityList1.size());
+                integers.add(num);
+            }
+            Iterator<Integer> it = integers.iterator();
+            while(it.hasNext())
+            {
+                int id = it.next();
+                projectEntity projectEntity =projectEntityList1.get(id);
+                categoryEntity categoryEntity = categoryDao.retNum(projectEntity.getCategoryId());
+                projectEntity.setCategoryName(categoryEntity.getCategoryName());
+                projectEntityList.add(projectEntity);
+            }
         }
 
+
+
         return projectEntityList;
     }
     public String retProjectByUserId(int id){