JSP 无法解析为类型

Question

<%@ page import ="java.util.*" %>
<%@ page import ="book.*" %>


ArrayList movies = (ArrayList) request.getAttribute("movieinfo");

    if(movies!=null){
        for(int i=0;i<movies.size();i++){
                    movie b = (movie) movies.get(i);
            out.println("<tr>");
            out.println("<td>" + b.getMovieID() + "</td>");
            out.println("<td>" + b.getMovieTitle() + "</td>");
            out.println("<td>" + b.getReleaseDate() + "</td>");
            out.println("<td>" + b.getDescription() + "</td>");
            out.println("<td>" + b.getImage() + "</td>");

             }
        }

您好，我正在尝试遍历电影的数组列表。但是我收到一个错误：

movie 是一个 java value bean

org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: 80 in the jsp file: /index.jsp
movie cannot be resolved to a type
77:     
78:     if(movies!=null){
79:         for(int i=0;i<movies.size();i++){
80:                     movie b = (movie) movies.get(i);
81:             out.println("<tr>");
82:             out.println("<td>" + b.getMovieID() + "</td>");
83:             out.println("<td>" + b.getMovieTitle() + "</td>");

感谢您的帮助。请让我知道我是否应该提供其他 bean 的附加信息，例如实用程序 bean

src/movie/movie.java

package movie;

import java.util.Date;

public class movie {

    private int MovieID;
    private String MovieTitle;
    private String Description;
    private String Image;
    private Date ReleaseDate;

    public int getMovieID() {
        return MovieID;
    }
    public void setMovieID(int movieID) {
        MovieID = movieID;
    }
    public String getMovieTitle() {
        return MovieTitle;
    }
    public void setMovieTitle(String movieTitle) {
        MovieTitle = movieTitle;
    }
    public String getDescription() {
        return Description;
    }
    public void setDescription(String description) {
        Description = description;
    }
    public String getImage() {
        return Image;
    }
    public void setImage(String image) {
        Image = image;
    }
    public Date getReleaseDate() {
        return ReleaseDate;
    }
    public void setReleaseDate(Date releaseDate) {
        ReleaseDate = releaseDate;
    }

}

src/movie/MovieDB.java

    package movie;
    import java.sql.*;
    import java.util.ArrayList;

public class MovieDB {
    public ArrayList movies (String query){
        ArrayList movies= new ArrayList();

        try {
            // step 1 : load JDBC Driver
            Class.forName("com.mysql.jdbc.Driver");

            //step2 : define Connection URL
            String connURL = "jdbc:mysql://localhost:3306/sp_movie?user=root&password=root";

            //step3 establish connection url
            Connection conn = DriverManager.getConnection(connURL);

            String sql="{call "+query+"}";
            CallableStatement cs=conn.prepareCall(sql);

            ResultSet rs=cs.executeQuery();

            while(rs.next()){
                movie movies1 = new movie();
                movies1.setMovieID(rs.getInt("Movie_ID"));
                movies1.setMovieTitle(rs.getString("Movie_Title"));
                movies1.setReleaseDate(rs.getDate("Release_Date"));
                movies1.setImage(rs.getString("Image"));
                movies1.setDescription(rs.getString("Description"));

                movies.add(movies1);
            }
            } catch (Exception e){
            } finally {
                try {

                } catch (Exception e) {}
            }
            return movies;
        }
}

src/movie/Moviesearch.java

package movie;

import java.io.IOException;
import java.util.ArrayList;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class Moviesearch
 */
@WebServlet("/Moviesearch")
public class Moviesearch extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public Moviesearch() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String search = (String) request.getAttribute("search");
        String searchtype = (String) request.getAttribute("searchtype");
        String query = null;

        if (searchtype.equals("title")){
            query = "titlesearch('"+search+"')";
        }else if(searchtype.equals("genre")){
            query = "genresearch('"+search+"')";
        }else if(searchtype.equals("actor")){
            query = "actorsearch('"+search+"')";
        }

        ArrayList movies = null;
        try{
            String userid = request.getParameter("userid");
            MovieDB getinfo = new MovieDB();
            movies =  getinfo.movies(query);

            request.setAttribute("movieinfo",movies);
            RequestDispatcher rd = request.getRequestDispatcher("index.jsp");
            rd.forward(request, response);
        } catch (Exception e){

        } finally {
        }

    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
    }

}

Answer 1

查看您的 movie 类定义。它被封装在movie 包内。

package movie; // full class name will be movie.movie
import java.util.Date;
public class movie { ......
}

您应该将movie 类导入为：

<%@ page import ="movie.movie" %>

即使在 JSP 中编写 Java 代码也是非常不鼓励的。阅读How to avoid Java Code in JSP-Files?。

为了您的目的，您可以使用JSTL 的<c:forEach> 循环。