新闻发布系统

import com.opensymphony.xwork2.ActionSupport; public class DeleteFileAction extends ActionSupport { private int id;

public int getId() { return id; }

public void setId(int id) { this.id = id; }

@Override

public String execute() throws Exception {

UploadManager manager = new UploadManager(); String path = ServletActionContext.getRequest().getRealPath("/upload/file");

System.out.println(manager.getFileNameById(this.getId())); File file = new File(path,manager.getFileNameById(this.getId())); try{

if(manager.deleteFile(this.getId())){ file.delete();//删除磁盘上的文件

ServletActionContext.getRequest().setAttribute("state", "deleteFileSuc"); }

}catch(Exception e){ e.printStackTrace();

ServletActionContext.getRequest().setAttribute("state", "deleteFileFail");

return ERROR; }

return SUCCESS; } }

3.5 留言管理

功能：删除留言

实现：根据后台指定要删除留言的Id，在数据库中删除留言及其下级留言 public boolean deleteMessage(String id){ boolean b = false; try {

con = DBConnector.getConnection();

ps =con.prepareStatement("delete from messages where pid=?");

ps.setString(1, id); ps.executeUpdate();