Question

嗨，我是spring的新手，我正在尝试spring中的基本程序。我的代码模板是

SpringDemo.java

    public class SpringDemo {
        public static void main(String[] args) {
                ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
                Triangle triangle=(Triangle)context.getBean("triangle");
                triangle.draw();
            }
    }

Triangle.java

    package org.amulya.springs;

    public class Triangle {
        private Point pointA;
        private Point pointB;
        private Point pointC;

        public Point getPointA() {
            return pointA;
        }

        public void setPointA(Point pointA) {
            this.pointA = pointA;
        }

        public Point getPointB() {
            return pointB;
        }

        public void setPointB(Point pointB) {
            this.pointB = pointB;
        }

        public Point getPointC() {
            return pointC;
        }

        public void setPointC(Point pointC) {
            this.pointC = pointC;
        }

        public void draw() {
            System.out.println("pointA is (" + getPointA().getX() + "," + getPointA().getY() + ")");
            System.out.println("pointB is (" + getPointB().getX() + "," + getPointB().getY() + ")");
            System.out.println("pointC is (" + getPointC().getX() + "," + getPointC().getY() + ")");
        }
    }

spring.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd">


<beans>
    <bean id="triangle" class="org.amulya.springs.Triangle">
    <property name="pointA" ref="zeropoint"/>
    <property name="pointB" ref="point1"/>
    <property name="pointC" ref="point2"/>
    </bean>

    <bean id="zeropoint" class="org.amulya.springs.Point">
    <property name="x" value="0"/>
    <property name="x" value="0"/>
    </bean>

    <bean id="point1" class="org.amulya.springs.Point">
    <property name="x" value="-20"/>
    <property name="x" value="0"/>
    </bean>

    <bean id="point2" class="org.amulya.springs.Point">
    <property name="x" value="20"/>
    <property name="x" value="0"/>
    </bean>
</beans>

point.java

    package org.amulya.springs;

    public class Point {
        private int x;
        private int y;
        public int getX() {
            return x;
        }
        public void setX(int x) {
            this.x = x;
        }
        public int getY() {
            return y;
        }
        public void setY(int y) {
            this.y = y;
        }

    }

spring.xml：/SpringDemo/src/spring.xml

例外：

在类路径中定义名称为“triangle”的bean时出错 resource [spring.xml]：无法解析匹配的构造函数（提示：为简单参数指定索引/类型/名称参数以避免类型模糊度）

请帮帮我

Answer 1

<bean id="zeropoint" class="org.amulya.springs.Point">
    <property name="x" value="0"/>
    <property name="x" value="0"/>
    </bean>

    <bean id="point1" class="org.amulya.springs.Point">
    <property name="x" value="-20"/>
    <property name="x" value="0"/>
    </bean>

    <bean id="point2" class="org.amulya.springs.Point">
    <property name="x" value="20"/>
    <property name="x" value="0"/>
    </bean>

此代码中的

将属性名称更改为 X和Y

错误是由于歧义造成的

在类路径资源[spring.xml]中定义名称为“triangle”的bean创建时出错：无法解析匹配的构造函数

1 个答案: