Spring In Action 属性注入

 

SequenceGeneratorImpl 类

@Scope("session")
public class SequenceGeneratorImpl implements SequenceGenerator {
 /** 前缀 ***/
 private String prefix;

 /** 后缀 **/
 private String suffix;

 /** 初始值 **/
 private int initial;

 /** 计数器 ***/
 private int counter;

 public SequenceGeneratorImpl() {

 }

 public SequenceGeneratorImpl(String prefix, String suffix, int initial,
   int counter) {
  super();
  this.prefix = prefix;
  this.suffix = suffix;
  this.initial = initial;
  this.counter = counter;
 }

 public String getSequence() {
  StringBuffer sb = new StringBuffer();
  sb.append(prefix);
  sb.append(initial + counter++);
  sb.append(suffix);
  return sb.toString();
 }

 public String getPrefix() {
  return prefix;
 }

 public void setPrefix(String prefix) {
  this.prefix = prefix;
 }

 public String getSuffix() {
  return suffix;
 }

 public void setSuffix(String suffix) {
  this.suffix = suffix;
 }

 public int getInitial() {
  return initial;
 }

 public void setInitial(int initial) {
  this.initial = initial;
 }

 public int getCounter() {
  return counter;
 }

 public void setCounter(int counter) {
  this.counter = counter;
 }

}

Bean 的配置

<bean id="sequenceGenerator" class="SpringInAction.IOC.SequenceGeneratorImpl">
  <property name="prefix">
   <value>30</value>
  </property>
  <property name="suffix">
   <value>A</value>
  </property>
  <property name="initial">
   <value>10000</value>
  </property>
 </bean>

 

运行结果

3010000A
3010001A

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简单的属性注入：

<bean id="sequenceGenerator" class="SpringInAction.IOC.SequenceGeneratorImpl">
  <property name="prefix" value="B30"/>
  <property name="suffix" value="A"/>
  <property name="initial" value="10000" />

</bean>

结果

B3010000A
B3010001A

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构造器注入属性

<bean id="sequenceGenerator" class="SpringInAction.IOC.SequenceGeneratorImpl">
  <constructor-arg value="C30" />
  <constructor-arg value="B" />
  <constructor-arg value="10000" />
 </bean>

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 从Spring 2.0 开始添加了一种便利的属性定义缩写。 它使用 p schema 像 bean 元素中的属性那样定义bean属性。这样可以缩短XML的配置

<bean id="sequenceGenerator" class="SpringInAction.IOC.SequenceGeneratorImpl" p:prefix="D" p:suffix="D" p:initial="10000"/>