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;

    }

    @Override

    public String toString() {

        return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);

    }

}

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.populate

        Student 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;

    }

    @Override

    public String toString() {

        return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);

    }

}

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.copypropertis

        StudentVo 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;

    }

    @Override

    public String toString() {

        return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);

    }

}

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;

    }

    @Override

    public String toString() {

        return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);

    }

}

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;

    }

    @Override

    public String toString() {

        return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);

    }

}

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);

    }

}

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