为什么JSP页面无法在另一个JSP页面中传递值？
我想在JSP上开发一个简单的注册表单页面。我是春天的新人。我试图这样做，如果我把值放在JSP页面上，那么另一个JSP页面就会获得值并显示它们。这是我的LoginController.java：
public class LoginController extends HttpServlet{
@RequestMapping(value="/user",method = RequestMethod.GET)
/* public String viewRegistration(Map<String, Object> model) {
User userForm = new User();
model.put("userForm", userForm);
return "index";
}*/
public ModelAndView student() {
return new ModelAndView("user", "user", new User());
}
@RequestMapping(value="/Login",method = RequestMethod.POST)
public String processCredentials(@RequestParam("fullName")String fullName,@RequestParam("fName")String fName
,@RequestParam("mName")String mName,@RequestParam("nationality")String nationality
,@RequestParam("occupation")String occupation,@RequestParam("address")String address
,@RequestParam("about")String about , HttpServletRequest request,
HttpServletResponse response, Object command , @ModelAttribute("user") User user,
ModelMap model) {
String message = "Invalid credentials";
/*if(userName.equals("admin") && password.equals("123")) {
message = "Welcome " + userName + "!!";
}*/
/* Map<String,String>data = new HashMap<String,String>();
data.put("fullName",fullName);
data.put("fName",fName);
data.put("mName",mName);
data.put("nationality",nationality);
data.put("occupation",occupation);
data.put("address",address);
data.put("about",about);
*/
request.getAttribute(fullName);
request.getAttribute(fName);
request.getAttribute(mName);
request.getAttribute(nationality);
request.getAttribute(occupation);
request.getAttribute(address);
request.getAttribute(about);
model.addAttribute(user.getFullName());
model.addAttribute(user.getfName());
model.addAttribute(user.getmName());
model.addAttribute(user.getfName());
model.addAttribute(user.getNationality());
model.addAttribute( user.getAddress());
model.addAttribute(user.getAbout());
model.addAttribute(user.getOccupation());
//User user2 = new User();
model.addAttribute("user", user);
return "welcome";
// return new ModelAndView("welcome" , "request",request);
}
我的index.jsp是：
<!-- <html>
<head> <title>Spring MVC login example.</title>
</head>
<body>
<form action="login" method="post">
UserName:<input type="text" name="userName"/> <br/><br/>
Password:<input type="password" name="password"/> <br/><br/>
<input type="submit" value="login"/>
</form>
</body>
</html> -->
<%--
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Spring Login Form</title>
</head>
<body>
<form action="login" method="POST">
<div align="center">
<table>
<tr>
<td>User Name</td>
<td><input type="text" name="userName" /></td>
</tr>
<tr>
<td>Password</td>
<td><input type="password" name="password" /></td>
</tr>
<tr>
<td></td>
<td><input type="submit" value="Submit" /></td>
</tr>
</table>
<c:choose>
<c:when test="${request.getAttribute("message")!='null'"}">
<%= request.getAttribute("message") %>
</c:when>
</c:choose>
</div>
</form>
</body>
</html>
--%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<style>
td{
clear: left;
width: 100px;
text-align: right;
margin-right: 10px;
font-family:Verdana, Arial, Helvetica, sans-serif;
font-size:14px;
color:red;
}
body {
background-color:#b6e1a0;
}
</style>
<title>Spring Login Form</title>
</head>
<body>
<form action="/LoginSystemPAL/Login" method="POST" commandName="user" >
<div align="center">
<table>
<tr>
<td>Full Name</td>
<td><input type="text" name="fullName" path="fullName" /></td>
</tr>
<tr>
</br></br></td>
</tr>
<tr>
<td>Father's Name</td>
<td><input type="text" name="fName" path="fName"/></td>
</tr>
<tr>
</br></br></td>
</tr>
<tr>
<td>Mother's Name</td>
<td><input type="text" name="mName" path="mName" /></td>
</tr>
<tr>
</br></br></td>
</tr>
<tr>
<td>Nationality</td>
<td><input type="text" name="nationality" path="nationality"/></td>
</tr>
<tr>
</br></br></td>
</tr>
<tr>
<td>Occupation</td>
<td><input type="text" name="occupation" path="occupation"/></td>
</tr>
<tr>
</br></br></td>
</tr>
<tr>
<td>Address</td>
<td><input type="text" name="address" path="address"/></td>
</tr>
<tr>
</br></br></td>
</tr>
<tr>
<td>About</td>
<td><input type="text" name="about" path="about" /></td>
</tr>
<tr>
</br></br></td>
</tr>
<tr>
<td></td>
<td><input type="submit" value="Submit" /></td>
</tr>
</table>
</div>
</form>
</body>
</html>
我的welcome.jsp是：
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<style>
td{
clear: left;
width: 100px;
text-align: right;
margin-right: 10px;
font-family:Verdana, Arial, Helvetica, sans-serif;
font-size:14px;
color:red;
}
body {
background-color:#b6e1a0;
}
</style>
<title>Spring Login Form</title>
</head>
<body>
<div align="center">
<table>
<tr>
<td>Full Name</td>
<td> <%=request.getAttribute("user.fullName")%></td>
<%-- <td> ${fullName} </td> --%>
</tr>
<tr>
</br></br></td>
</tr>
<tr>
<td>Father's Name</td>
<%-- <td><%=request.getAttribute("fName")%></td> --%>
<td> ${user.fName} </td>
</tr>
<tr>
</br></br></td>
</tr>
<tr>
<td>Mother's Name</td>
<%-- <td><%=request.getAttribute("mName")%></td> --%>
<td> ${mName} </td>
</tr>
<tr>
</br></br></td>
</tr>
<tr>
<td>Nationality</td>
<%-- <td><%=request.getAttribute("nationality")%></td> --%>
<td> ${nationality} </td>
</tr>
<tr>
</br></br></td>
</tr>
<tr>
<td>Occupation</td>
<%-- <td><%=request.getAttribute("occupation")%></td> --%>
<td> ${occupation} </td>
</tr>
<tr>
</br></br></td>
</tr>
<tr>
<td>Address</td>
<%-- <td><%=request.getAttribute("address")%></td> --%>
<td> ${address} </td>
</tr>
<tr>
</br></br></td>
</tr>
<tr>
<td>About</td>
<%-- <td><%=request.getAttribute("about")%></td> --%>
<td> ${about} </td>
</tr>
<tr>
</br></br></td>
</tr>
<tr>
<td></td>
<td><input type="submit" value="Submit" /></td>
</tr>
</table>
</div>
</body>
</html>
我的pom.xml是：
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.pran.pal</groupId>
<artifactId>LoginSystemPAL</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>LoginSystemPAL Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.3.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.4.3</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>3.1.0.RELEASE</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>3.1.0.RELEASE</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.2</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>3.0-alpha-1</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
</dependencies>
<build>
<finalName>LoginSystemPAL</finalName>
</build>
</project>
The web.xml is:
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Archetype Created Web Application</display-name>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.css</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.js</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.png</url-pattern>
</servlet-mapping>
</web-app>
<!-- <web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">
<display-name>Spring MVC Application</display-name>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/dispatcher-servlet.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app> -->
welcomre.jsp没有任何价值。显示如下：
康索尔没有错误。我现在可以做什么？
3 个答案:
答案 0 :(得分：0)
尝试使用<c:out value="${modelAttribute}" />代替${modelAttribute}，看看它是否有效。
如果你尚未包含它，请包含jstl的taglib。
<%@ taglib prefix="c"
uri="http://java.sun.com/jsp/jstl/core" %>
答案 1 :(得分：0)
我建议您使用flash attribute facility of Spring MVC在控制器方法中添加RedirectAttributes，如下所示，
@RequestMapping(value="/Login",method = RequestMethod.POST)
public String processCredentials(@RequestParam("fullName")String fullName,
@RequestParam("fName")String fName,
@RequestParam("mName")String lName,
@RequestParam("nationality")String nationality,
@RequestParam("occupation")String occupation,
@RequestParam("address")String address,
@RequestParam("about")String about,
HttpServletRequest request,
HttpServletResponse response,
Object command,
@ModelAttribute("user") User user,
ModelMap model,
RedirectAttributes redir) {
redir.addFlashAttribute("user", user);
return "redirect:/welcome";
}
答案 2 :(得分：0)
首先简化您的控制器：
/**
* Spring MVC framework will automatically bind form fields with name X to corresponding
* fields name setX() in specified Model attribute.
*
*/
@RequestMapping(value="/Login",method = RequestMethod.POST)
public String processCredentials(@ModelAttribute("user") User user) {
//make Model Attribute available to next view
return new ModelAndView("welcome", user);
}
其次，不要在JSP页面中使用scriptlet。
How to avoid Java code in JSP files?
在JSP中，您可以使用JSP表达式语言或JSTL标记：EL在这里很好。模式看起来像：
<tr>
<td> ${user.about} </td>
</tr>
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