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使用Spring MVC控制器映射JSP文本输入

[英]Map JSP text input with Spring MVC controller

 原文  2018-06-24 12:21:09  7   2    java/ spring-mvc/ jsp

问题描述

我正在开发一个简单的Java Web应用程序，该应用程序允许用户在文本框中输入一些信息，并在提交输入的文本时在另一个页面（success.jsp）中回显。 我在StackOverflow中已经提到了许多教程和问题，但是无法完成。 你能帮我这个忙吗？

我想将jsp表单中的文本提交到SpringMVC控制器。 Maven用于依赖性管理。

非常感谢

mainController.java 

import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;    
@Controller
public class mainController {
    @RequestMapping(value = "/", method = RequestMethod.GET)
    public String index(Map<String, Object> model){
        textConv textconv = new textConv();
        model.put("textcovn", textconv);
        return "index";
    }

    @RequestMapping(value = "/translate", method = RequestMethod.POST)
    public String translate(@ModelAttribute("textconv") textConv textconv, Map<String, Object> model){
        System.out.println(textconv.getTextFrom());
        return "success";
    }
}

textConv.java 

public class textConv {
    String textFrom;

    public String getTextFrom() {
        return textFrom;
    }

    public void setTextFrom(String textFrom) {
        this.textFrom = textFrom;
    }
}

index.jsp 

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ 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=UTF-8">
<title>Registration</title>
</head>
<body>
<h3>Enter text</h3>

 <form action="translate" method="POST" commandName="textconv">
 <textarea rows="4" cols="50" path="textFrom">Enter text here</textarea>
 <input type="submit" value="Echo">
</form>
</body>
</html>

success.jsp 

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ 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=UTF-8">
<title>Registration</title>
</head>
 <body>
    <h3>Text : ${textconv.getTextFrom}</h3>
    </body>
</html>

2 个解决方案

解决方案1
 2 已采纳  2018-06-25 06:49:31

您忘记了将请求参数绑定到模型。 将其绑定到模型，并将其传递到成功视图。 将您的TestController更改为 

@Controller
public class TestController {

    @RequestMapping(value = "/", method = RequestMethod.GET)
    public String index() {
        return "index";
    }

    @RequestMapping(value = "/translate", method = RequestMethod.POST)
    public String translate(@RequestParam String textForm, Model model) {
        // this will bind the request param to model
        model.addAttribute("textForm", textForm);

        return "success";
    }
}

您还处理了不正确的表格来提交请求。 如果您打算仅使用简单的HTML表单，请在index.jsp以这种方式进行操作 

   <form action="/translate" method="POST">
      <div class="form-group">
        <div class="col-md-4">
            <textarea class="form-control" name="textForm">
                   default text
            </textarea>
        </div>
      </div>
      <input type="submit" value="Submit">
   </form>

当您提交表单并将其分派到success.jsp视图时，请使用正确的表达式来打印模型值 

<body>
    <h3>Text : ${textForm}</h3>
</body>

解决方案2
 0  2018-06-25 02:42:13

我在这里与您分享一个简单易懂且可行的解决方案。

EmployeeController.java 

@Controller
public class EmployeeController {

    @RequestMapping(value = "/employee", method = RequestMethod.GET)
    public ModelAndView showForm() {
        return new ModelAndView("employeehome", "employee", new Employee());
    }

    @RequestMapping(value = "/addEmployee", method = RequestMethod.POST)
    public String submit(@Valid @ModelAttribute("employee") Employee employee, BindingResult result, ModelMap model) {
        if (result.hasErrors()) {
            return "employeeerror";
        }
        model.addAttribute("name", employee.getName());
        model.addAttribute("contactNumber", employee.getContactNumber());
        model.addAttribute("id", employee.getId());
        return "employeeview";
    }    
}

Employee.java 

public class Employee {

    private String name;
    private long id;
    private String contactNumber;

    public Employee() {
        super();
    }

    public Employee(String name, long id, String contactNumber) {
        super();
        this.name = name;
        this.id = id;
        this.contactNumber = contactNumber;
    }

//getters and setters
}

employeehome.jsp 

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <%@ 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=UTF-8">
<title>Insert title here</title>
</head>
<body>

    <h3>Welcome, Enter The Employee Details</h3>

    <form:form method="POST" action="${pageContext.request.contextPath}/addEmployee" modelAttribute="employee">
        <table>
            <tr>
                <td><form:label path="name">Name</form:label></td>
                <td><form:input path="name" /></td>
            </tr>
            <tr>
                <td><form:label path="id">Id</form:label></td>
                <td><form:input path="id" /></td>
            </tr>
            <tr>
                <td><form:label path="contactNumber">Contact Number</form:label></td>
                <td><form:input path="contactNumber" /></td>
            </tr>
            <tr>
                <td><input type="submit" value="Submit" /></td>
            </tr>
        </table>
    </form:form>


</body>
</html>

employeeview.jsp 

<%@ 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>Insert title here</title>
</head>
<body>
    <h2>Submitted Employee Information</h2>
    <table>
        <tr>
            <td>Name :</td>
            <td>${name}</td>
        </tr>
        <tr>
            <td>ID :</td>
            <td>${id}</td>
        </tr>
        <tr>
            <td>Contact Number :</td>
            <td>${contactNumber}</td>
        </tr>
    </table>
</body>
</html>

employeeerror.jsp 

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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>Insert title here</title>
</head>
<body>
    <h3>Pleas enter the correct details</h3>
    <table>
        <tr>
            <td><a href="employee">Retry</a></td>
        </tr>
    </table>

</body>
</html>

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