1 The image has been uploaded, and the correct image address has been obtained from the database
2 You can also view the correct image address on the page
3 Restart tomcat and the image will be displayed

What is the problem

Front-end page

 <% response.setHeader("Pragma", "No-Cache"); response.setHeader("Cache-Control", "No-Cache"); response.setDateHeader("Expires", 0); BookDao bookDao = new BookDao(); List list = new ArrayList<>(); List item = new ArrayList(); list = bookDao.listBookInfo(); %> <% for (Books books : list ) { %> 
 
 
 
 
 
<%=books.getBookname() + "( 书号：" + books.getBookid() + ")"%> 
 
 
 
<%=books.getWriter()%> 
 
<%=books.getCbs()%> 
 
 
 
<%=books.getItems()%> 
 
 
 
 <% } %>

Dao

public List listBookInfo() { List list = new ArrayList(); try { String sql = "SELECT * FROM books WHERE isLend=1"; ps = conn.prepareStatement(sql); rs = ps.executeQuery(); while (rs.next()) { Books books = new Books(); books.setBookid(rs.getLong("bookId")); books.setBookname(rs.getString("bookName")); books.setCbs(rs.getString("cbs")); books.setWriter(rs.getString("writer")); books.setIslend(rs.getLong("isLend")); books.setItems(rs.getString("items")); books.setDate(rs.getTimestamp("date")); books.setImgPath(rs.getString("imgpath")); list.add(books); } } catch (SQLException e) { e.printStackTrace(); } return list; }