这是我怀疑导致问题的 servlet 代码。将电影添加到数据库后,我不知道如何让 servlet 重定向回 list.jsp 页面。我认为这与 doGet() 方法有关。你能指出我正确的方向吗?我正在使用 Netbeans、Tomcat 和 Oracle 11g XE。
package movies;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@SuppressWarnings({"unused", "serial"})
public class MovieAdd extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Connection c = null;
Statement stmt = null;
ResultSet rs = null;
String sql;
PrintWriter out = response.getWriter();
response.setContentType("text/html");
String movie = request.getParameter("movie");
String year = request.getParameter("year");
String rating = request.getParameter("rating");
String actors = "";
for (int l = 0; l < 5; l++) {
String m = "a" + (l + 1);
String actor = request.getParameter(m);
if (actor != null && actor != "" && !actor.isEmpty()) {
actor = actor + ", ";
actors = actors + actor;
}
}
if (actors.endsWith(", ")) {
actors = actors.substring(0, actors.length() - 2);
}
System.out.println(actors);
try {
Class.forName("oracle.jdbc.OracleDriver");
c = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521/XE", "system", "password");//PUT DATABASE CONNECTION INFO
c.setAutoCommit(false);
System.out.println("Opened database successfully");
stmt = c.createStatement();
sql = "INSERT INTO MOVIES (NAME, YEAR, RATING, ACTORS) VALUES ('"
+ movie
+ "','"
+ year
+ "','"
+ rating
+ "','"
+ actors
+ "')";
stmt.executeUpdate(sql);
c.commit();
sql = "SELECT * FROM MOVIES";
rs = stmt.executeQuery(sql);
while (rs.next()) {
String movieDb = rs.getString("NAME");
int yearDb = rs.getInt("YEAR");
int ratingDb = rs.getInt("RATING");
int actorsDb = rs.getInt("ACTORS");
System.out.println("Movie:- " + movieDb);
System.out.println("Year of Release:- " + yearDb);
System.out.println("Rating:- " + ratingDb);
System.out.println("Actors:- " + actorsDb + "\n");
}
stmt.close();
c.close();
} catch (Exception e) {
System.err.println(e.getClass().getName() + ": " + e.getMessage());
System.exit(0);
}
String site = "list.jsp";
response.setStatus(HttpServletResponse.SC_MOVED_TEMPORARILY);
response.setHeader("Location", site);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String site = "add.jsp";
response.setStatus(HttpServletResponse.SC_MOVED_TEMPORARILY);
response.setHeader("Location", site);
}
}
最佳答案
先生。洛查明是绝对正确的,我给了你答案,因为你对我最初的问题有正确的答案。我的代码的真正问题是,在这个 while 循环中,数据类型与数据库数据类型的实际不匹配。
while (rs.next()) {
String movieDb = rs.getString("NAME");
int yearDb = rs.getInt("YEAR");
int ratingDb = rs.getInt("RATING");
int actorsDb = rs.getInt("ACTORS");//Should be a string, not an int
System.out.println("Movie:- " + movieDb);
System.out.println("Year of Release:- " + yearDb);
System.out.println("Rating:- " + ratingDb);
System.out.println("Actors:- " + actorsDb + "\n");
关于java - 数据库交互后重定向,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29851514/