SSM學習系列（二）Spring對象

Spring初步使用

注入對象

沿用上次的工程
新建兩個類
Category和Product

Category.java

public class Category {

  public int getId() {
    return id;
  }
  public void setId(int id) {
    this.id = id;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  private int id;
  private String name="category 1";
}

Product.java

public class Product {
  private int id;
  private String name="product 1";

  private Category category;

  public int getId() {
    return id;
  }

  public void setId(int id) {
    this.id = id;
  }

  public String getName() {
    return name;
  }

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

  public Category getCategory() {
    return category;
  }

  public void setCategory(Category category) {
    this.category = category;
  }
}

修改spring-config.xml

<bean name="c" class="com.isdust.zor.pojo.Category">
        <property name="name" value="category 1"/>
    </bean>
    <bean name="p" class="com.isdust.zor.pojo.Product">
        <property name="name" value="product1" />
        <property name="category" ref="c"/>
    </bean>

其中ref用來標記注入，將product注入到category中
執行結果以下：

採用註解方式注入對象

修改product和category，加入註解，並賦予默認值

//爲Product類加上@Component註解，即代表此類是bean
@Component("p")
public class Product {
  private int id;
  private String name="product 1";

  @Autowired
  private Category category;

  public int getId() {
    return id;
  }

  public void setId(int id) {
    this.id = id;
  }

  public String getName() {
    return name;
  }

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

  public Category getCategory() {
    return category;
  }

  public void setCategory(Category category) {
    this.category = category;
  }
}

//爲Category 類加上@Component註解，即代表此類是bean
@Component("c")
public class Category {

  public int getId() {
    return id;
  }
  public void setId(int id) {
    this.id = id;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  private int id;
  private String name="category 1";
}

修改spring-config.xml，刪除全部子標籤，加入自動掃描

<context:component-scan base-package="com.isdust.zor.pojo"/>
<context:annotation-config/>

執行結果

結果同xml指定相同

致謝
參考資料
官方文檔
http://how2j.cn/k/spring/spri...