BeanUtils使用

1.BeanUtils.populate

可以把一个map中的属性拷贝到实体javaBean，例子：

Student:

package com.cy.model;import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;public class Student{private String id;private String name;private String stuNo;private String address;public Student(){}public Student(String id, String name, String stuNo, String address) {this.id = id;this.name = name;this.stuNo = stuNo;this.address = address;}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getStuNo() {return stuNo;}public void setStuNo(String stuNo) {this.stuNo = stuNo;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}@Overridepublic String toString() {return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);}
}

View Code

package com.cy.test;import com.cy.model.Student;
import org.apache.commons.beanutils.BeanUtils;
import java.util.HashMap;
import java.util.Map;public class BeanUtilTest {public static void main(String[] args) throws Exception {//1.BeanUtils.populateStudent s1 = new Student();Map<String, String> map = new HashMap<String, String>();map.put("id", "1");map.put("name", "zhangsan");BeanUtils.populate(s1, map);System.out.println(s1);}
}

Student[id=1,name=zhangsan,stuNo=<null>,address=<null>]

2.BeanUtils.copypropertis(Object dest, Object orig)

将源实体属性拷贝到目标dest属性中。

StudentVo:

package com.cy.vo;import com.cy.model.Student;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;public class StudentVo {private String name;private String stuNo;public StudentVo(){}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getStuNo() {return stuNo;}public void setStuNo(String stuNo) {this.stuNo = stuNo;}@Overridepublic String toString() {return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);}
}

View Code

package com.cy.test;import com.cy.model.Student;
import com.cy.vo.StudentVo;
import org.apache.commons.beanutils.BeanUtils;import java.util.HashMap;
import java.util.Map;public class BeanUtilTest {public static void main(String[] args) throws Exception {Student s = new Student();s.setId("1");s.setName("xiaoming");s.setStuNo("001");//2.BeanUtils.copypropertisStudentVo sv = new StudentVo();BeanUtils.copyProperties(sv, s);System.out.println(sv);}
}

StudentVo[name=xiaoming,stuNo=001]

3.但是如果两个类的属性名不一样，就不能复制属性了。如：

StudentDto：

package com.cy.dto;import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;public class StudentDto {private String student_id;private String name;private String stu_no;private String address;public String getStudent_id() {return student_id;}public void setStudent_id(String student_id) {this.student_id = student_id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getStu_no() {return stu_no;}public void setStu_no(String stu_no) {this.stu_no = stu_no;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}@Overridepublic String toString() {return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);}
}

View Code

package com.cy.test;import com.cy.dto.StudentDto;
import com.cy.model.Student;
import com.cy.vo.StudentVo;
import org.apache.commons.beanutils.BeanUtils;import java.util.HashMap;
import java.util.Map;public class BeanUtilTest {public static void main(String[] args) throws Exception {StudentDto st = new StudentDto();st.setStudent_id("1");st.setStu_no("001");st.setName("xiaoming");st.setAddress("beijing");Student s = new Student();BeanUtils.copyProperties(s, st);System.out.println(s);}
}

Student[id=<null>,name=xiaoming,stuNo=<null>,address=beijing]

4.属性类型不一样，也是可以转化成功的：

StudentDto：

package com.cy.dto;import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;public class StudentDto {private Integer id;private String name;private String stu_no;private String address;private Boolean good;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public Boolean getGood() {return good;}public void setGood(Boolean good) {this.good = good;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getStu_no() {return stu_no;}public void setStu_no(String stu_no) {this.stu_no = stu_no;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}@Overridepublic String toString() {return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);}
}

View Code

Student:

package com.cy.model;import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;public class Student{private String id;private String name;private String stuNo;private String address;private String good;public Student(){}public String getGood() {return good;}public void setGood(String good) {this.good = good;}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getStuNo() {return stuNo;}public void setStuNo(String stuNo) {this.stuNo = stuNo;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}@Overridepublic String toString() {return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);}
}

View Code

package com.cy.test;import com.cy.dto.StudentDto;
import com.cy.model.Student;
import com.cy.vo.StudentVo;
import org.apache.commons.beanutils.BeanUtils;import java.util.HashMap;
import java.util.Map;public class BeanUtilTest {public static void main(String[] args) throws Exception {StudentDto st = new StudentDto();st.setId(1);st.setStu_no("001");st.setName("xiaoming");st.setAddress("beijing");st.setGood(true);Student s = new Student();BeanUtils.copyProperties(s, st);System.out.println(s);}
}

View Code

Student[id=1,name=xiaoming,stuNo=<null>,address=beijing,good=true]

转载于:https://www.cnblogs.com/tenWood/p/10517471.html

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