BeanUtils.copyProperties用法的测试

最新推荐文章于 2024-04-16 11:07:16 发布

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本文详细介绍了在Java编程中使用BeanUtils类进行对象属性复制时遇到的异常情况，以及如何通过测试用例进行验证。重点探讨了属性类型不匹配导致的IllegalArgumentException，并提供了解决方案。

以下方法主要为测试用，验证抛异常情况，代码如下：

分SourceBean.java、TargetBean.java、CopyPropertiesMainTest.java 其中SourceBean.java和TargetBean.java的区别是属性值width一个为String类型、另一个为long类型

/**
 * 
 */
package testcopyproperties;

/**
 * @author quyang.ybb
 *
 */
public class SourceBean {
    
    private String age;
    
    private String name;
    
    private String gender;
    
    private boolean success;
    
    private long length;
    
    private long width;

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public boolean isSuccess() {
        return success;
    }

    public void setSuccess(boolean success) {
        this.success = success;
    }

    public long getLength() {
        return length;
    }

    public void setLength(long length) {
        this.length = length;
    }

    public long getWidth() {
        return width;
    }

    public void setWidth(long width) {
        this.width = width;
    }
   
}

/**
 * 
 */
package testcopyproperties;

/**
 * @author quyang.ybb
 *
 */
public class TargetBean {
    
    private String age;
    
    private String name;
    
    private String gender;
    
    private boolean success;
    
    private long length;
    
    private String width;

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public boolean isSuccess() {
        return success;
    }

    public void setSuccess(boolean success) {
        this.success = success;
    }

    public long getLength() {
        return length;
    }

    public void setLength(long length) {
        this.length = length;
    }

    public String getWidth() {
        return width;
    }

    public void setWidth(String width) {
        this.width = width;
    }
    
}

/**
 * 
 */
package testcopyproperties;

import org.springframework.beans.BeanUtils;

/**
 * @author quyang.ybb
 *
 */
public class CopyPropertiesMainTest {

    /**
     * @param args
     */
    public static void main(String[] args) {
	SourceBean sourceBean = new SourceBean();
	TargetBean targetBean = new TargetBean();
	sourceBean.setAge("18");
	sourceBean.setWidth(100);
	try {
	    BeanUtils.copyProperties(sourceBean, targetBean);
	} catch (Exception e) {
	    e.printStackTrace();
	}
	System.out.println("The end");
    }

}

运行后报错提示：

org.springframework.beans.FatalBeanException: Could not copy properties from source to target; nested exception is java.lang.IllegalArgumentException: argument type mismatch
	at org.springframework.beans.BeanUtils.copyProperties(BeanUtils.java:599)
	at org.springframework.beans.BeanUtils.copyProperties(BeanUtils.java:509)
	at testcopyproperties.CopyPropertiesMainTest.main(CopyPropertiesMainTest.java:23)
Caused by: java.lang.IllegalArgumentException: argument type mismatch
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.springframework.beans.BeanUtils.copyProperties(BeanUtils.java:596)
	... 2 more

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