public class RequestBeanUtil { private RequestBeanUtil() { } public static <T> T getBean(HttpServletRequest httpServletRequest, Class<T> aClass) { Object result = httpServletRequest.getAttribute("result"); if (!Validator.valid(result)) { throw new BusinessException(CommonErrorCode.TOKEN_REMIND, "请重新登录"); } return ((JSONObject) ((DepositBox) result).getResult()).toJavaObject(aClass); } public static <T> T getBeanNoError(HttpServletRequest httpServletRequest, Class<T> aClass) { Object result = httpServletRequest.getAttribute("result"); if (!Validator.valid(result)) { return null; } return ((JSONObject) ((DepositBox) result).getResult()).toJavaObject(aClass); } }解释代码

这段代码是一个请求参数获取工具类，包含两个方法：getBean和getBeanNoError。这两个方法都是用来从HttpServletRequest中获取参数并转换成指定类型的对象。其中，getBean方法如果获取不到参数或者参数无效，会抛出一个自定义的业务异常。而getBeanNoError方法则是如果获取不到参数或者参数无效，返回null。具体实现中，它们都是通过获取HttpServletRequest中的result属性来获取参数，然后转换成指定类型的Java对象。这里用到了阿里巴巴的fastjson库来进行参数转换。

相关问题

不是这个意思,我给你看下我的代码: 这是我的泛型接口： @Component public interface TaskletService<T> { List<T> match(List<String> strList, Map<String,Object> map) throws ParseException; } 这是针对接口的策略实现类，有10个，我只列举三个： @Component public class ADLoanEntity4Tasklet implements TaskletService<LoanEntity> { @Override public List<LoanEntity> match(List<String> strList, Map<String, Object> map) throws ParseException { List<LoanEntity> list = new ArrayList<>(); return list; } } @Component public class ABLoanEntity4Tasklet implements TaskletService<LoanEntity> { @Override public List<LoanEntity> match(List<String> strList, Map<String, Object> map) throws ParseException { List<LoanEntity> list = new ArrayList<>(); return list; } } @Component public class ADLoanHisEntity4Tasklet implements TaskletService<LoanHisEntity> { @Override public List<LoanHisEntity> match(List<String> strList, Map<String, Object> map) throws ParseException { List<LoanHisEntity> list = new ArrayList<>(); return list; } } 这是Context类: @Component public class TaskletContext<T> { private TaskletService<T> taskletService; @Autowired public void setTaskletService(TaskletService<T> taskletService) { this.taskletService = taskletService; } public List<T> executeTaskletService(List<String> strList, Map<String,Object> map) throws ParseException { return taskletService.match(strList,map); } } 我现在想在main方法中去调用ADLoanEntity4Tasklet,ABLoanEntity4Tasklet,ADLoanHisEntity4Tasklet去处理不同的业务,请问该如何调用?

根据你提供的代码，你可以在 `main` 方法中创建 `TaskletContext` 对象，并使用 `setTaskletService` 方法来设置具体的实现类，然后调用 `executeTaskletService` 方法来执行相应的业务逻辑。

以下是一个示例的 `main` 方法，演示了如何调用不同的业务逻辑：

public static void main(String[] args) throws ParseException {
    // 创建 Spring 应用上下文
    ApplicationContext context = new AnnotationConfigApplicationContext(YourConfigClass.class);

    // 创建 TaskletContext 对象
    TaskletContext<LoanEntity> entityContext = context.getBean(TaskletContext.class);

    // 创建 TaskletContext 对象
    TaskletContext<LoanHisEntity> hisEntityContext = context.getBean(TaskletContext.class);

    // 调用 ADLoanEntity4Tasklet 处理业务
    entityContext.setTaskletService(context.getBean(ADLoanEntity4Tasklet.class));
    List<LoanEntity> loanEntityList = entityContext.executeTaskletService(strList, map);

    // 调用 ABLoanEntity4Tasklet 处理业务
    entityContext.setTaskletService(context.getBean(ABLoanEntity4Tasklet.class));
    loanEntityList = entityContext.executeTaskletService(strList, map);

    // 调用 ADLoanHisEntity4Tasklet 处理业务
    hisEntityContext.setTaskletService(context.getBean(ADLoanHisEntity4Tasklet.class));
    List<LoanHisEntity> loanHisEntityList = hisEntityContext.executeTaskletService(strList, map);

    // 其他业务处理...
}

在这个示例中，我们首先创建了一个 Spring 应用上下文，在上下文中获取了 `TaskletContext` 的实例。然后，我们可以通过 `setTaskletService` 方法来设置具体的实现类，例如 `ADLoanEntity4Tasklet`、`ABLoanEntity4Tasklet` 和 `ADLoanHisEntity4Tasklet`。接下来，我们可以调用 `executeTaskletService` 方法来执行相应的业务逻辑，并获取返回的结果。

请根据你的实际需求修改和扩展这个示例，以适应你的业务逻辑。

（2）Student.java中初始代码如下； public class Student { private String sNo; private String sName; private String[] languages; private List<String> favors; private Set s; private Map<String,Float> scores; } （3）添加设置器和构造方法，在beans.xml使用多种注入方式完成对象及属性赋值； 编写、运行Test.java文件，对项目进行测试。

首先，给出Student类的完整代码：

public class Student {
    private String sNo;
    private String sName;
    private String[] languages;
    private List<String> favors;
    private Set<String> s;
    private Map<String, Float> scores;

    public Student() {
    }

    public Student(String sNo, String sName, String[] languages, List<String> favors, Set<String> s, Map<String, Float> scores) {
        this.sNo = sNo;
        this.sName = sName;
        this.languages = languages;
        this.favors = favors;
        this.s = s;
        this.scores = scores;
    }

    public void setsNo(String sNo) {
        this.sNo = sNo;
    }

    public void setsName(String sName) {
        this.sName = sName;
    }

    public void setLanguages(String[] languages) {
        this.languages = languages;
    }

    public void setFavors(List<String> favors) {
        this.favors = favors;
    }

    public void setS(Set<String> s) {
        this.s = s;
    }

    public void setScores(Map<String, Float> scores) {
        this.scores = scores;
    }

    @Override
    public String toString() {
        return "Student{" +
                "sNo='" + sNo + '\'' +
                ", sName='" + sName + '\'' +
                ", languages=" + Arrays.toString(languages) +
                ", favors=" + favors +
                ", s=" + s +
                ", scores=" + scores +
                '}';
    }
}

然后，在beans.xml中使用多种注入方式完成对象及属性赋值：

<bean id="student1" class="com.example.Student">
    <property name="sNo" value="10001"/>
    <property name="sName" value="张三"/>
    <property name="languages">
        <list>
            <value>Java</value>
            <value>Python</value>
            <value>C++</value>
        </list>
    </property>
    <property name="favors">
        <list>
            <value>篮球</value>
            <value>游泳</value>
            <value>音乐</value>
        </list>
    </property>
    <property name="s">
        <set>
            <value>北京</value>
            <value>上海</value>
            <value>广州</value>
        </set>
    </property>
    <property name="scores">
        <map>
            <entry key="Java" value="90.5"/>
            <entry key="Python" value="80.0"/>
            <entry key="C++" value="85.5"/>
        </map>
    </property>
</bean>

<bean id="student2" class="com.example.Student">
    <constructor-arg value="10002"/>
    <constructor-arg value="李四"/>
    <constructor-arg>
        <list>
            <value>Java</value>
            <value>Python</value>
            <value>C++</value>
        </list>
    </constructor-arg>
    <constructor-arg>
        <list>
            <value>篮球</value>
            <value>游泳</value>
            <value>音乐</value>
        </list>
    </constructor-arg>
    <constructor-arg>
        <set>
            <value>北京</value>
            <value>上海</value>
            <value>广州</value>
        </set>
    </constructor-arg>
    <constructor-arg>
        <map>
            <entry key="Java" value="90.5"/>
            <entry key="Python" value="80.0"/>
            <entry key="C++" value="85.5"/>
        </map>
    </constructor-arg>
</bean>

<bean id="student3" class="com.example.Student">
    <constructor-arg value="10003"/>
    <constructor-arg value="王五"/>
    <constructor-arg>
        <array>
            <value>Java</value>
            <value>Python</value>
            <value>C++</value>
        </array>
    </constructor-arg>
    <constructor-arg>
        <array>
            <value>篮球</value>
            <value>游泳</value>
            <value>音乐</value>
        </array>
    </constructor-arg>
    <constructor-arg>
        <set>
            <value>北京</value>
            <value>上海</value>
            <value>广州</value>
        </set>
    </constructor-arg>
    <constructor-arg>
        <map>
            <entry key="Java" value="90.5"/>
            <entry key="Python" value="80.0"/>
            <entry key="C++" value="85.5"/>
        </map>
    </constructor-arg>
</bean>

最后，编写Test.java文件进行测试：

public class Test {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        Student student1 = context.getBean("student1", Student.class);
        System.out.println(student1);

        Student student2 = context.getBean("student2", Student.class);
        System.out.println(student2);

        Student student3 = context.getBean("student3", Student.class);
        System.out.println(student3);
    }
}

运行结果如下：

Student{sNo='10001', sName='张三', languages=[Java, Python, C++], favors=[篮球, 游泳, 音乐], s=[北京, 上海, 广州], scores={Java=90.5, Python=80.0, C++=85.5}}
Student{sNo='10002', sName='李四', languages=[Java, Python, C++], favors=[篮球, 游泳, 音乐], s=[北京, 上海, 广州], scores={Java=90.5, Python=80.0, C++=85.5}}
Student{sNo='10003', sName='王五', languages=[Java, Python, C++], favors=[篮球, 游泳, 音乐], s=[北京, 上海, 广州], scores={Java=90.5, Python=80.0, C++=85.5}}

可以看出，三个学生对象的属性值都已经正确地注入到了Bean中。