不管是html页面表单提交的对象数据还是和第三方公司进行接口对接,都需要对接收到的数据进行校验(非空、长度、格式等等)。如果使用if一个个进行校验(字段非常多),这是让人崩溃的过程。幸好jdk或hibernate都提供了对object对象的校验,只需加上相应的注解即可。
pom.xml
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<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.fei</groupId>
<artifactId>validation-test</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>javax.el</groupId>
<artifactId>javax.el-api</artifactId>
<version>2.2.4</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>5.1.3.Final</version>
</dependency>
</dependencies>
</project>2.基本校验练习
StudentInfo.java
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package com.fei.info;
import javax.validation.constraints.Pattern;
import org.hibernate.validator.constraints.NotBlank;
public class StudentInfo {
@NotBlank(message="用户名不能为空")
private String userName;
@NotBlank(message="年龄不能为空")
@Pattern(regexp="^[0-9]{1,2}$",message="年龄是整数")
private String age;
/**
* 如果是空,则不校验,如果不为空,则校验
*/
@Pattern(regexp="^[0-9]{4}-[0-9]{2}-[0-9]{2}$",message="出生日期格式不正确")
private String birthday;
@NotBlank(message="学校不能为空")
private String school;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getBirthday() {
return birthday;
}
public void setBirthday(String birthday) {
this.birthday = birthday;
}
public String getSchool() {
return school;
}
public void setSchool(String school) {
this.school = school;
}
}
ValidatorUtil.java
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package com.fei.util;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.groups.Default;
public class ValidatorUtil {
private static Validator validator = Validation.buildDefaultValidatorFactory()
.getValidator();
public static <T> Map<String,StringBuffer> validate(T obj){
Map<String,StringBuffer> errorMap = null;
Set<ConstraintViolation<T>> set = validator.validate(obj,Default.class);
if(set != null && set.size() >0 ){
errorMap = new HashMap<String,StringBuffer>();
String property = null;
for(ConstraintViolation<T> cv : set){
//这里循环获取错误信息,可以自定义格式
property = cv.getPropertyPath().toString();
if(errorMap.get(property) != null){
errorMap.get(property).append("," + cv.getMessage());
}else{
StringBuffer sb = new StringBuffer();
sb.append(cv.getMessage());
errorMap.put(property, sb);
}
}
}
return errorMap;
}
}
ValidatorTest.java
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package com.fei;
import java.util.Map;
import com.fei.info.StudentInfo;
import com.fei.util.ValidatorUtil;
public class ValidatorTest {
public static void main(String[] args) {
StudentInfo s = new StudentInfo();
long startTime = System.currentTimeMillis();
print(ValidatorUtil.validate(s));
System.out.println("===============耗时(毫秒)=" + (System.currentTimeMillis() - startTime));
s.setUserName("小明");
s.setAge("a10");
s.setBirthday("2016-9-1");
startTime = System.currentTimeMillis();
print(ValidatorUtil.validate(s));
System.out.println("===============耗时(毫秒)=" + (System.currentTimeMillis() - startTime));
}
private static void print(Map<String,StringBuffer> errorMap){
if(errorMap != null){
for(Map.Entry<String, StringBuffer> m : errorMap.entrySet()){
System.out.println(m.getKey() + ":" + m.getValue().toString());
}
}
}
}
来看看运行结果:
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十二月 12, 2016 4:02:00 下午 org.hibernate.validator.internal.util.Version <clinit>
INFO: HV000001: Hibernate Validator 5.1.3.Final
school:学校不能为空
age:年龄不能为空
userName:用户名不能为空
===============耗时(毫秒)=280
birthday:出生日期格式不正确
school:学校不能为空
age:年龄是整数
===============耗时(毫秒)=3