diff --git a/src/com/hellogithub/dao/fileDao.java b/src/com/hellogithub/dao/fileDao.java
new file mode 100644
index 0000000..a218a02
--- /dev/null
+++ b/src/com/hellogithub/dao/fileDao.java
@@ -0,0 +1,43 @@
+package com.hellogithub.dao;
+
+import com.hellogithub.entity.fileEntity;
+import com.hellogithub.utils.JdbcUtils;
+import org.apache.commons.dbutils.QueryRunner;
+import org.apache.commons.dbutils.handlers.BeanHandler;
+import org.apache.commons.dbutils.handlers.BeanListHandler;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.util.List;
+
+public class fileDao {
+
+    public List<fileEntity> selectFileEntity()
+    {
+        List<fileEntity> fileEntityList ;
+        try {
+            Connection conn = JdbcUtils.getConnection();
+            QueryRunner runner = new QueryRunner();
+            String sql="select *  from onefile ";
+            fileEntityList = runner.query(conn,sql,new BeanListHandler<>(fileEntity.class));
+            conn.close();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        return fileEntityList;
+    }
+    public fileEntity selectFileEntityById(int id )
+    {
+        fileEntity fileEntity ;
+        try {
+            Connection conn = JdbcUtils.getConnection();
+            QueryRunner runner = new QueryRunner();
+            String sql="select *  from onefile where id = ?";
+            fileEntity = runner.query(conn,sql,new BeanHandler<>(fileEntity.class),id);
+            conn.close();
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+        return fileEntity;
+    }
+}
diff --git a/src/com/hellogithub/entity/fileEntity.java b/src/com/hellogithub/entity/fileEntity.java
new file mode 100644
index 0000000..e160e57
--- /dev/null
+++ b/src/com/hellogithub/entity/fileEntity.java
@@ -0,0 +1,86 @@
+package com.hellogithub.entity;
+
+public class fileEntity {
+    int id;
+    String oneFileName;
+    String language;
+    String description;
+
+    int userId;
+    String url;
+    int lookNum;
+    String Content;
+    int isValid;
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getOneFileName() {
+        return oneFileName;
+    }
+
+    public void setOneFileName(String oneFileName) {
+        this.oneFileName = oneFileName;
+    }
+
+    public String getLanguage() {
+        return language;
+    }
+
+    public void setLanguage(String language) {
+        this.language = language;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+
+    public int getUserId() {
+        return userId;
+    }
+
+    public void setUserId(int userId) {
+        this.userId = userId;
+    }
+
+    public String getUrl() {
+        return url;
+    }
+
+    public void setUrl(String url) {
+        this.url = url;
+    }
+
+    public int getLookNum() {
+        return lookNum;
+    }
+
+    public void setLookNum(int lookNum) {
+        this.lookNum = lookNum;
+    }
+
+    public String getContent() {
+        return Content;
+    }
+
+    public void setContent(String content) {
+        Content = content;
+    }
+
+    public int getIsValid() {
+        return isValid;
+    }
+
+    public void setIsValid(int isValid) {
+        this.isValid = isValid;
+    }
+}
diff --git a/src/com/hellogithub/service/oneFileService.java b/src/com/hellogithub/service/oneFileService.java
new file mode 100644
index 0000000..4ee28f8
--- /dev/null
+++ b/src/com/hellogithub/service/oneFileService.java
@@ -0,0 +1,12 @@
+package com.hellogithub.service;
+
+import com.hellogithub.dao.fileDao;
+import com.hellogithub.entity.fileEntity;
+
+import java.util.List;
+
+public class oneFileService {
+    private fileDao fileDao = new fileDao();
+    public List<fileEntity> selectFileEntity(){return fileDao.selectFileEntity(); }
+    public fileEntity selectFileEntityById(int id ){return  fileDao.selectFileEntityById(id); }
+}
diff --git a/src/com/hellogithub/servlet/systemAdmin/selectFileByIdServlet.java b/src/com/hellogithub/servlet/systemAdmin/selectFileByIdServlet.java
new file mode 100644
index 0000000..9ca1c16
--- /dev/null
+++ b/src/com/hellogithub/servlet/systemAdmin/selectFileByIdServlet.java
@@ -0,0 +1,39 @@
+package com.hellogithub.servlet.systemAdmin;
+
+import com.alibaba.fastjson.JSONObject;
+import com.hellogithub.service.oneFileService;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+@WebServlet("/selectFileById")
+public class selectFileByIdServlet extends HttpServlet {
+    private oneFileService oneFileService  = new oneFileService();
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        doPost(req, resp);
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        resp.setCharacterEncoding("UTF-8");
+        resp.setContentType("text/html; charset=utf-8");
+        //        设置响应头允许ajax跨域访问
+        String curOrigin = req.getHeader("Origin");
+        resp.setHeader("Access-Control-Allow-Origin", curOrigin == null ? "true" : curOrigin);
+        resp.setHeader("Access-Control-Allow-Credentials", "true");
+        resp.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, HEAD");
+        resp.setHeader("Access-Control-Max-Age", "3600");
+        resp.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin, authority, content-type, version-info, X-Requested-With");
+        resp.setContentType("application/json;charset=UTF-8");
+        String id = req.getParameter("id");
+        String jsonString = JSONObject.toJSONString(oneFileService.selectFileEntityById(Integer.parseInt(id)));
+        PrintWriter writer = resp.getWriter();
+        writer.println(jsonString);
+    }
+}
diff --git a/src/com/hellogithub/servlet/systemAdmin/selectFileServlet.java b/src/com/hellogithub/servlet/systemAdmin/selectFileServlet.java
new file mode 100644
index 0000000..e299040
--- /dev/null
+++ b/src/com/hellogithub/servlet/systemAdmin/selectFileServlet.java
@@ -0,0 +1,39 @@
+package com.hellogithub.servlet.systemAdmin;
+
+import com.alibaba.fastjson.JSONObject;
+import com.hellogithub.service.oneFileService;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+@WebServlet("/selectFile")
+public class selectFileServlet extends HttpServlet {
+    private oneFileService oneFileService = new oneFileService();
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        doPost(req, resp);
+    }
+
+    @Override
+    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        resp.setCharacterEncoding("UTF-8");
+        resp.setContentType("text/html; charset=utf-8");
+        //        设置响应头允许ajax跨域访问
+        String curOrigin = req.getHeader("Origin");
+        resp.setHeader("Access-Control-Allow-Origin", curOrigin == null ? "true" : curOrigin);
+        resp.setHeader("Access-Control-Allow-Credentials", "true");
+        resp.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, HEAD");
+        resp.setHeader("Access-Control-Max-Age", "3600");
+        resp.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin, authority, content-type, version-info, X-Requested-With");
+        resp.setContentType("application/json;charset=UTF-8");
+        String jsonString = JSONObject.toJSONString(oneFileService.selectFileEntity());
+
+        PrintWriter writer = resp.getWriter();
+        writer.println(jsonString);
+    }
+}