从servlet重定向到servlet [英] Redirect from servlet to servlet
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问题描述
我想将文本框中的数据插入到oracle数据库中，所以在我的HTML中有文本框（和3个按钮 - 新建，更新并保存）所以当我点击三个按钮中的任何一个时，我需要redirectServlet，从这个servlet我想再次将我的页面转发到insertServlet（即当我点击NEW按钮时），但我收到404错误。可能是我的逻辑错误或wex.xml需要正确映射。任何人都可以帮助它紧急。
I want to insert data from Text box to oracle database ,so in my HTML where there are text box (and 3 Buttons-New ,Update and save)so when i click any of three buttons it takes me to redirectServlet , and from this servlet I want to again forward my page to insertServlet(i.e When I click NEW Button) ,but I am getting 404 error . May be my logic is wrong or wex.xml needs to be mapped properly . Can anyone help please Its urgent.
**wex.xml code**
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>AcerLink</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<display-name>redirectServlet</display-name>
<servlet-name>redirectServlet</servlet-name>
<servlet-class>redirectServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>redirectServlet</servlet-name>
<url-pattern>/redirectServlet</url-pattern>
</servlet-mapping>
<servlet>
<description></description>
<display-name>insertServlet</display-name>
<servlet-name>insertServlet</servlet-name>
<servlet-class>insertServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>insertServlet</servlet-name>
<url-pattern>/insertServlet</url-pattern>
</servlet-mapping>
</web-app>
redirectServlet
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class redirectServlet
*/
public class redirectServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public redirectServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
if (request.getParameter("NEW") != null) {
response.sendRedirect("/insertServlet");
return ;
} else if (request.getParameter("UPDATE") != null) {
request.getRequestDispatcher("/redirectServlet").forward(request, response);
} else if (request.getParameter("SAVE") != null) {
request.getRequestDispatcher("save.jsp").forward(request, response);
}
}
}
insertServlet
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class insertServlet
*/
public class insertServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public insertServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
PrintWriter out = response.getWriter();
PrintWriter pwinsert = response.getWriter();
// PrintWriter pwdelete = res.getWriter();
Connection con = null;
PreparedStatement ps = null;
// ResultSet rs = null;
// Statement st = null;
String appl=request.getParameter("app");
String sel=request.getParameter("second");
String url= request.getParameter("link");
try {
Class.forName("oracle.jdbc.OracleDriver");
}
catch(ClassNotFoundException ex) {
System.out.println("driver not loaded");
System.exit(0);
}
String URL = "jdbc:oracle:thin:SCOTT/tiger@computer_1:1521:orcl";
try {
con = DriverManager.getConnection(URL);
if(request.getParameter("choise")==null) {
ps = con.prepareStatement("INSERT into TEST_LINKS (ID,APPLICATION,ENTITY,URL) VALUES(TEST_LI.nextval,?,?,?)");
ps.setString(1,appl);
ps.setString(2,sel);
ps.setString(3,url);
int i = ps.executeUpdate();
pwinsert.println(i);
if(i!=0) {
pwinsert.println("Your data has been stored in the database");
}
else {
pwinsert.println("Your data could not be stored in the database");
}
}
}
catch(Exception e) {
pwinsert.println(e.getMessage());
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
推荐答案
你可以使用
response.sendRedirect("/insertServlet");
或
ServletContext context= getServletContext();
RequestDispatcher rd= context.getRequestDispatcher("/insertServlet");
rd.forward(request, response);
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