StringMVC 中如何做數據校驗

步驟一：引入四個jar包

步驟二：注冊類型轉換器

 <context:component-scan base-package="cn.happy.controller"></context:component-scan><!-- 配置驗證器 --><bean id="myvalidator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean"><property name="providerClass" value="org.hibernate.validator.HibernateValidator"></property></bean> <mvc:annotation-driven validator="myvalidator"/>

步驟三：為實體類進行注解約束

package cn.happy.entity;import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.Pattern;
import javax.validation.constraints.Size;import org.hibernate.validator.constraints.NotEmpty;
/*** @Min最小值* @Max最大值* @NotEmpty 不允許為空* @Pattern 使用正則校驗* @Size 長度*/
public class UserInfo {//必須是0到100之間@Min(value=0,message="成績最小值為{value}")@Max(value=100,message="成績最大值為{value}")@NotEmpty(message="成績不允許為空")  private Integer score;//手機號碼必須不能為空,必須是以1 開頭 第二位3,4,5,6,7,8,9   最后9位隨意@NotEmpty(message="手機號碼不允許為空")  @Pattern(regexp="^1[3,4,5,6,7,8,9]\\d{9}$",message="手機號碼不正確")private String phone;//不能為空//必須是6個字符以上@NotEmpty(message="用戶名不能為空") @Size(min=6,message="名稱至少6個字符")private String name;public Integer getScore() {return score;}public void setScore(Integer score) {this.score = score;}public String getPhone() {return phone;}public void setPhone(String phone) {this.phone = phone;}public String getName() {return name;}public void setName(String name) {this.name = name;}}

步驟四：編寫Handler控制器

package cn.happy.controller;import javax.validation.Valid;import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;import cn.happy.entity.UserInfo;@Controller
public class FirstController {@RequestMapping("/first.do")public ModelAndView doFirst(@Valid UserInfo info,BindingResult br){ModelAndView mv=new ModelAndView();mv.setViewName("/WELCOME.jsp");//記錄到底是哪個字段驗證失敗了//有一個可以偵測到驗證錯誤總數的方法int errorCount = br.getErrorCount();if (errorCount>0) {//證明模型驗證失敗FieldError score = br.getFieldError("score");FieldError name = br.getFieldError("name");FieldError phone = br.getFieldError("phone");if (score!=null) {mv.addObject("scoremsg",score.getDefaultMessage());}if (name!=null) {mv.addObject("namemsg",name.getDefaultMessage());}if (phone!=null) {mv.addObject("phonemsg",phone.getDefaultMessage());}mv.setViewName("/index.jsp");}//高中  英文版的吻別return mv ;}
}

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