From 40f35c9723885067c2034f0309bb2facf8d78045 Mon Sep 17 00:00:00 2001
From: p10297854 <944423246@qq.com>
Date: Fri, 9 Jul 2021 18:14:34 +0800
Subject: [PATCH] ADD file via upload

---
 back/src/com/demo/files/QueyOneFilenames.java | 102 ++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 back/src/com/demo/files/QueyOneFilenames.java

diff --git a/back/src/com/demo/files/QueyOneFilenames.java b/back/src/com/demo/files/QueyOneFilenames.java
new file mode 100644
index 0000000..8723103
--- /dev/null
+++ b/back/src/com/demo/files/QueyOneFilenames.java
@@ -0,0 +1,102 @@
+package com.demo.files;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.io.PrintWriter;
+import java.sql.Blob;
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.ArrayList;
+
+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 org.apache.commons.fileupload.FileItem;
+import org.apache.commons.io.IOUtils;
+
+import com.domain.GetDBConnection;
+import com.domain.musicMIDI;
+
+import net.sf.json.JSONObject;
+
+/**
+ * Servlet implementation class QueyOneFilenames
+ */
+@WebServlet("/QueyOneFilenames")
+public class QueyOneFilenames extends HttpServlet {
+	private static final long serialVersionUID = 1L;
+       
+    /**
+     * @see HttpServlet#HttpServlet()
+     */
+    public QueyOneFilenames() {
+        super();
+        // TODO Auto-generated constructor stub
+    }
+
+	/**
+	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
+	 */
+	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+		// TODO Auto-generated method stub
+		Connection con=null;
+	      Statement sql; 
+	      ResultSet rs;
+	      PreparedStatement preSql;
+		con = GetDBConnection.connectDB("musicMySQL","root","root");
+	     if(con == null ) return;
+	     try {
+			 sql=con.createStatement();
+			 con.setAutoCommit(false);//程序必须调用commit或者rollback方法
+			 String sqlStr ="SELECT filename FROM music WHERE username=?";
+			 preSql = con.prepareStatement(sqlStr);	  
+			 String username = request.getParameter("username");
+			 username = new String(username.getBytes("iso8859-1"),"UTF-8");
+			 System.out.println(username);
+			 preSql.setString(1, username);
+			 rs=preSql.executeQuery();
+			 int i=0;
+			 
+			 ArrayList<musicMIDI> musiclist = new ArrayList<>();
+			 while(rs.next()) {
+				 musicMIDI music = new musicMIDI();
+				 music.setFilename(rs.getString("filename"));
+				 System.out.println(music.getFilename());
+				 musiclist.add(music);
+			 }
+			 PrintWriter out = response.getWriter();
+			 String json2[] = null;
+			 JSONObject jsonobject = new JSONObject();
+			 jsonobject.put("size", musiclist.size());
+			for(i=0;i<musiclist.size();i++) {
+				musicMIDI item =  musiclist.get(i);//循环遍历list
+				jsonobject.put("filename"+i, item.getFilename());
+				 System.out.println(item.getFilename());
+				System.out.println(jsonobject);
+				
+			}
+		
+			System.out.println(jsonobject);
+	    	out.println(jsonobject);
+			
+		}catch(SQLException e) {
+			
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+	
+
+	}
+
+}