Question

我正在使用Springs表单标记库来提交用户表单..我能够在方法处理程序中捕获post请求参数，但它不会显示在jsp中，无论用户提交了什么，都需要打印它。

以下是控制器类

package com.sagar;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;


@Controller

public class MyController {



    @RequestMapping(value="/edit",method=RequestMethod.GET)

    public String handleUserInput(Model m,@ModelAttribute("userLogin") User user){

        m.addAttribute(new User());

        return "edit";

    }


    @RequestMapping(value="/edit",method=RequestMethod.POST)

    public String handleUserPost(@ModelAttribute("userLogin") User user,Model mav ){
        mav.addAttribute("user",user);
        System.out.println(user.getFirstName());
        System.out.println(user.getLastName());
        System.out.println(user.getPassword());

        return "view";

    }

}

Web的上下文

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans     
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context.xsd ">


     <context:component-scan base-package="com.sagar"/>

<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix"><value>/WEB-INF/</value></property>
<property name="suffix"><value>.jsp</value></property>
<property name="viewClass">
<value>org.springframework.web.servlet.view.JstlView</value>
</property>
</bean>
<mvc:default-servlet-handler/>
<mvc:annotation-driven/>
</beans>

以下是我的用户类

package com.sagar;

public class User {

    private String firstName;
    private String lastName;
    private String password;

    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public String getFirstName() {
        return firstName;
    }
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
    public String getLastName() {
        return lastName;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

}

View.jsp（应该显示用户提交的任何内容）。

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
    <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
    <%@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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<table>
    <tr>
        <td>Name</td>
        <td>${firstName}</td>
    </tr>
    <tr>
        <td>LastName</td>
        <td>${lastName}</td>
    </tr>
    <tr>
        <td>password</td>
        <td>${password}</td>
    </tr>
</table> 
</body>
</html>

用户表单（edit.jsp）

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
    <%@ taglib prefix="form" uri="http://www.springframework.org/tags/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=ISO-8859-1">
<title>Welcome to Login Page</title>
</head>
<body>

<form:form modelAttribute="userLogin">
      <table>
          <tr>
              <td>First Name:</td>
              <td><form:input path="firstName" /></td>
          </tr>
          <tr>
              <td>Last Name:</td>
              <td><form:input path="lastName" /></td>
          </tr>
          <tr>
      <td>Password:</td>
      <td>
          <form:password path="password" />
      </td>
  </tr>
          <tr>
              <td colspan="2">
                  <input type="submit" value="Log In" />
              </td>
          </tr>
      </table>
  </form:form>
</body>
</html>

请参阅输出的截图 Please see this screenshot of output

Answer 1

您已将实体User绑定到名为user的键，因此当您想要获取对象值时，您应该使用此键${user.firstName}。
尝试更改用于渲染jsp的参数，如下所示;）

<table>
  <tr>
    <td>Name</td>
    <td>${user.firstName}</td>
  </tr>
  <tr>
    <td>LastName</td>
    <td>${user.lastName}</td>
  </tr>
  <tr>
    <td>password</td>
    <td>${user.password}</td>
  </tr>
</table>

发布请求参数未显示给jsp

1 个答案: