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我正在從spring 4.X升級spring-mvc web應用程序以成爲彈簧引導戰。彈簧啓動1.3.5窗體：錯誤不顯示爲jsp
頁供應，形式發佈，執行驗證（並記錄一個錯誤），但JSP的確顯示形式的任何錯誤：錯誤
同一個JSP工作彈簧啓動的罰款之外。
要確保我設置我的春天啓動的JSP應用程序正確，我只是增加了一個表格郵寄到現有的「彈簧引導採樣網絡JSP」（見https://github.com/spring-projects/spring-boot/tree/1.3.x/spring-boot-samples）
這裏是模型對象
package sample.jsp;
import java.io.Serializable;
public class EmailHolderPageModel implements Serializable {
private String emailAddress;
public EmailHolderPageModel() {
super();
}
public EmailHolderPageModel(String emailAddress) {
super();
this.emailAddress = emailAddress;
}
public String getEmailAddress() {
return emailAddress;
}
public void setEmailAddress(String emailAddress) {
this.emailAddress = emailAddress;
}
}
這裏是服務器側：
@Autowired
private EmailSaveValidator emailSaveValidator;
@RequestMapping("/saveEmail.html")
public ModelAndView processEmail(@ModelAttribute("myModel") EmailHolderPageModel pageModel, BindingResult result){
ModelAndView modelAndView = null;
emailSaveValidator.validate(pageModel, result);
if(result.hasErrors()){
modelAndView = new ModelAndView("enterEmail");
EmailHolderPageModel pm = new EmailHolderPageModel("");
modelAndView.addObject("myModel", pm);
System.err.println("!!!Failed Validation!!!");
} else {
modelAndView = new ModelAndView("thankyou");
ThankyouPageModel thankYoupageModel = new ThankyouPageModel();
modelAndView.addObject("thankyouModel", thankYoupageModel);
}
return modelAndView;
}
這裏是驗證
@Component
public class EmailSaveValidator implements Validator {
public boolean supports(Class candidate) {
return EmailHolderPageModel.class.isAssignableFrom(candidate);
}
public void validate(Object obj, Errors errors) {
ValidationUtils.rejectIfEmptyOrWhitespace(errors, "emailAddress", "emailRequired", "required field");
}
}
這裏是JSP（截斷了一點，因爲計算器是越來越糊塗）
<%@ page session="false"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
<html>
<head>
<title>test entering email</title>
</head>
<body>
<form:form commandName="myModel" method="POST" action="saveEmail.html" >
<form:errors path="emailAddress" htmlEscape="false" />
<div id="formIntro">
<spring:message text="enter email address" />
<p><strong><label>
<spring:message text="email address:" /> </label><form:input path="emailAddress" size="35" maxlength="200"/>
</label>
</strong></p>
</div>
<input type="submit" value="Submit" />
</form:form>
</body>
</html>
POM的文件（從彈簧引導採樣網絡JSP未修改）
<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<!-- Your own application should inherit from spring-boot-starter-parent -->
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-samples</artifactId>
<version>1.3.6.BUILD-SNAPSHOT</version>
</parent>
<artifactId>spring-boot-sample-web-jsp</artifactId>
<packaging>war</packaging>
<name>Spring Boot Web JSP Sample</name>
<description>Spring Boot Web JSP Sample</description>
<url>http://projects.spring.io/spring-boot/</url>
<organization>
<name>Pivotal Software, Inc.</name>
<url>http://www.spring.io</url>
</organization>
<properties>
<main.basedir>${basedir}/../..</main.basedir>
<m2eclipse.wtp.contextRoot>/</m2eclipse.wtp.contextRoot>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<useSystemClassLoader>false</useSystemClassLoader>
</configuration>
</plugin>
</plugins>
</build>
</project>
==============
而解決的辦法是不要錯誤地創建一個新的模型對象（雖然工作正常，當不是一個春季啓動應用程序）：
@RequestMapping("/saveEmail.html")
public ModelAndView processEmail(@ModelAttribute("myModel") EmailHolderPageModel pageModel, BindingResult result){
ModelAndView modelAndView = null;
emailSaveValidator.validate(pageModel, result);
if(result.hasErrors()){
modelAndView = new ModelAndView("enterEmail");
// !! SOLUTION !!
// DO NOT CREATE A NEW MODEL OBJECT
// !! SOLUTION !!
// EmailHolderPageModel pm = new EmailHolderPageModel("");
modelAndView.addObject("myModel", pageModel);
System.err.println("!!!Failed Validation!!!");
} else {
modelAndView = new ModelAndView("thankyou");
ThankyouPageModel thankYoupageModel = new ThankyouPageModel();
modelAndView.addObject("thankyouModel", thankYoupageModel);
}
return modelAndView;
}
我沒有被使用Boot，但你可以嘗試啓用在覈心彈簧類上調試日誌記錄，看看它是否會流光溢彩 – bphilipnyc