java根据数据库的路径读取txt文件并回显到jsp前端页面
时间: 2023-09-05 17:07:21 浏览: 136
首先,你需要连接数据库,然后从数据库中获取文本文件的路径。接下来,你可以使用Java的BufferedReader类和FileReader类来读取文本文件的内容,并将其存储在一个字符串变量中。最后,将这个字符串变量传递给JSP页面以进行回显。
以下是示例代码:
```java
//连接数据库并获取文件路径
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT file_path FROM files WHERE id = 1");
rs.next();
String filePath = rs.getString("file_path");
//读取文本文件内容
File file = new File(filePath);
BufferedReader br = new BufferedReader(new FileReader(file));
String line;
StringBuilder sb = new StringBuilder();
while ((line = br.readLine()) != null) {
sb.append(line).append("\n");
}
String fileContent = sb.toString();
//将内容传递给JSP页面
request.setAttribute("fileContent", fileContent);
RequestDispatcher dispatcher = request.getRequestDispatcher("myfile.jsp");
dispatcher.forward(request, response);
```
在JSP页面中,您可以使用EL表达式`${fileContent}`来显示文本文件的内容。例如:
```jsp
<textarea>${fileContent}</textarea>
```
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