spring mvc 提交表单的例子

2021-10-14 20:14:59

1. 构建MAVEN项目，然后转换成web格式，结构图如下：

2. 通过@RequestMapping来进行配置，当输入URL时，会以此找到对应方法执行，首先调用setupForm方法，该方法主要是生成一个EmployeeVO对象，然后返回给view.同时需要对form表单中的数据进行验证，其验证方法在submitForm方法中实现。

package com.howtodoinjava.demo.controller;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.validation.BindingResult;

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.SessionAttributes;

import org.springframework.web.bind.support.SessionStatus;

import com.howtodoinjava.demo.model.EmployeeVO;

import com.howtodoinjava.demo.service.EmployeeManager;

@Controller

@RequestMapping("/employee-module/addNew")

@SessionAttributes("employee")

public class EmployeeController {

    @Autowired

    EmployeeManager manager;

    @RequestMapping(method = RequestMethod.GET)

    public String setupForm(Model model) {

        EmployeeVO employeeVO = new EmployeeVO();

        model.addAttribute("employee", employeeVO);

        return "addEmployee";

    }

    @RequestMapping(method = RequestMethod.POST)

    public String submitForm(@ModelAttribute("employee") EmployeeVO employeeVO,

            BindingResult result, SessionStatus status) {

    	//Validation code start

        boolean error = false;

        System.out.println(employeeVO); //Verifying if information is same as input by user

        if(employeeVO.getFirstName().isEmpty()){

            result.rejectValue("firstName", "error.firstName");

            error = true;

        }

        if(employeeVO.getLastName().isEmpty()){

            result.rejectValue("lastName", "error.lastName");

            error = true;

        }

        if(employeeVO.getEmail().isEmpty()){

            result.rejectValue("email", "error.email");

            error = true;

        }

        if(error) {

            return "addEmployee";

        }

        // Store the employee information in database

        // manager.createNewRecord(employeeVO);

        // Mark Session Complete

        status.setComplete();//清除会话数据

        return "redirect:addNew/success";

    }

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

    public String success(Model model) {

        return "addSuccess";

    }

}

　　3. 修改jsp文件。

<%@ page contentType="text/html;charset=UTF-8"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>

<html>
<head>
<title>Add Employee Form</title>
<style>
.error
{
color: #ff0000;
font-weight: bold;
}
</style>
</head>

　　3. 在messages.properties文件添加error信息。

lbl.page=Add New Employee

lbl.firstName=First Name

lbl.lastName=Last Name

lbl.email=Email Id

//Error messages

error.firstName=First Name can not be blank

error.lastName=Last Name can not be blank

error.email=Email Id can not be blank

　其他地方无需做修改。

通过URL访问，可以得到

但是该例子存在一个问题尚未解决，即验证表单数据是否为空时，返回到addEmployee.jsp文件时，会报错。未找到原因。

三月 02, 2016 4:11:35 下午 org.springframework.web.servlet.tags.form.ErrorsTag doStartTag

SEVERE: No message found under code 'error.firstName' for locale 'zh_CN'.

org.springframework.context.NoSuchMessageException: No message found under code 'error.firstName' for locale 'zh_CN'.

	at org.springframework.context.support.AbstractMessageSource.getMessage(AbstractMessageSource.java:186)

	at org.springframework.context.support.AbstractApplicationContext.getMessage(AbstractApplicationContext.java:1127)

	at org.springframework.web.servlet.support.RequestContext.getMessage(RequestContext.java:732)

	at org.springframework.web.servlet.support.BindStatus.initErrorMessages(BindStatus.java:181)

	at org.springframework.web.servlet.support.BindStatus.getErrorMessages(BindStatus.java:277)

	at org.springframework.web.servlet.tags.form.ErrorsTag.exposeAttributes(ErrorsTag.java:174)

	at org.springframework.web.servlet.tags.form.AbstractHtmlElementBodyTag.writeTagContent(AbstractHtmlElementBodyTag.java:48)

	at org.springframework.web.servlet.tags.form.AbstractFormTag.doStartTagInternal(AbstractFormTag.java:84)

	at org.springframework.web.servlet.tags.RequestContextAwareTag.doStartTag(RequestContextAwareTag.java:80)

	at org.apache.jsp.WEB_002dINF.views.addEmployee_jsp._jspService(addEmployee_jsp.java:135)

	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)

	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)

	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:748)

	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:486)

	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:411)

	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:338)

	at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168)

	at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)

	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1228)

	at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1011)

	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:955)

	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)

	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)

	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)

	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)

	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)

	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)

	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)

	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)

	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)

	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)

	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)

	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)

	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)

	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313)

	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

	at java.lang.Thread.run(Unknown Source)

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