SpringMVC实现表单验证功能详解

本章节内容很丰富，主要有基本的表单操作，数据的格式化，数据的校验，以及提示信息的国际化等实用技能。
首先看效果图

项目结构图

接下来用代码重点学习springMVC的表单操作，数据格式化，数据校验以及错误提示信息国际化。请读者将重点放在UserController.java，User.java，input.jsp三个文件中。
Maven 项目必不可少的pom.xml文件。里面有该功能需要的所有jar包。

<?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>  <groupId>com.springmvc</groupId>  <artifactId>springmvc</artifactId>  <version>0.0.1-SNAPSHOT</version>  <packaging>war</packaging>   <!-- 若不配置，打包时会提示错误信息  Failed to execute Goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project springmvc: Compilation failure:  提示 未结束的字符串文字 ，若字符串后面加上空格后可以打包成功，但会乱码。  原因是：maven使用的是默认的compile插件来进行编译的。complier是maven的核心插件之一，然而complier插件默认只支持编译Java 1.4  -->  <build>  <plugins>   <plugin>    <artifactId>maven-compiler-plugin</artifactId>    <configuration>     <source>1.7</source>     <target>1.7</target>     <encoding>UTF-8</encoding>    </configuration>   </plugin>  </plugins>  </build>   <properties>  <spring.version>4.1.3.RELEASE</spring.version>  </properties>  <dependencies>  <!-- spring begin -->  <dependency>   <groupId>org.springframework</groupId>   <artifactId>spring-WEBmvc</artifactId>   <version>${spring.version}</version>  </dependency>   <dependency>   <groupId>org.springframework</groupId>   <artifactId>spring-context</artifactId>   <version>${spring.version}</version>  </dependency>   <dependency>   <groupId>org.springframework</groupId>   <artifactId>spring-aop</artifactId>   <version>${spring.version}</version>  </dependency>   <dependency>   <groupId>org.springframework</groupId>   <artifactId>spring-core</artifactId>   <version>${spring.version}</version>  </dependency>    <dependency>   <groupId>org.springframework</groupId>   <artifactId>spring-web</artifactId>   <version>${spring.version}</version>  </dependency>   <!-- spring end -->  <dependency>   <groupId>javax.servlet</groupId>   <artifactId>javax.servlet-api</artifactId>   <version>4.0.0</version>   <scope>provided</scope>  </dependency>  <dependency>   <groupId>javax.servlet</groupId>   <artifactId>jstl</artifactId>   <version>1.2</version>  </dependency>  <dependency>   <groupId>taglibs</groupId>   <artifactId>standard</artifactId>   <version>1.1.2</version>  </dependency>  <!-- 缺少jsp-api 则提示 javax.servlet.jsp.JspException cannot be resolved to a type -->  <dependency>   <groupId>javax.servlet.jsp</groupId>   <artifactId>jsp-api</artifactId>   <version>2.2</version>   <scope>provided</scope>  </dependency>  <!-- JSR 303 start -->  <dependency>   <groupId>org.hibernate</groupId>   <artifactId>hibernate-validator</artifactId>   <version>5.4.1.Final</version>  </dependency>  <dependency>   <groupId>javax.validation</groupId>   <artifactId>validation-api</artifactId>   <version>1.1.0.Final</version>  </dependency>  <!-- JSR 303 end -->     </dependencies> </project>