首先定义一个加在方法上的注解
import java.lang.annotation.*;
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD})
@Documented
@Inherited
public @interface AutoParameterFill {
String[] includes() default {};
}
编写参数常量类
也就是参数名称,例如 String username 的 username ;
基础常量类:
public class AutoParameterFillConstantsBase {
//do nothing
}
扩展的一个常量,拆分是为了将要填充的参数可以进行分类管理,避免一个类过大。
public class AutoParameterFillConstants extends AutoParameterFillConstantsBase {
public final static String ID = "id";
public final static String ZHANG_SAN = "zhangsan";
public final static String TEST_ENTITY = "testEntity";
}
定义一个接口
@AutoParameterFill
@RequestMapping("/test1")
public Object test1(@RequestParam(required = false) String id,
@RequestParam(required = false) String zhangsan,
@RequestBody TestEntity testEntity) {
return id + "----" + zhangsan + "----" + testEntity;
}
TestEntity:
import lombok.Data;
@Data
public class TestEntity {
private String id;
private String name;
}
编写对于不同参数的处理接口及实现
该类用于根据参数名获得指定实现:
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Component;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
@Component
public class AutoParameterAdapter implements InitializingBean {
private final Map<String, AutoParameterHandler> handlerMap = new ConcurrentHashMap<>();
@Autowired
private ApplicationContext applicationContext;
@Override
public void afterPropertiesSet() throws Exception {
applicationContext.getBeansOfType(AutoParameterHandler.class).forEach((k, v) -> {
if (StringUtils.isBlank(v.support())) {
return;
}
handlerMap.put(v.support(), v);
}
);
}
public void addParameter(String support, Object[] args, int i) {
handlerMap.get(support).handle(args, i);
}
}
该类为统一接口:
public interface AutoParameterHandler {
void handle(Object[] args, int i);
String support();
}
该类为id参数处理实现:
import com.kusch.ares.annos.AutoParameterFillConstants;
import org.springframework.stereotype.Component;
@Component
public class IdAutoParameterFillHandler implements AutoParameterHandler {
@Override
public void handle(Object[] args, int i) {
args[i] = "idididiidididididididid";
}
@Override
public String support() {
return AutoParameterFillConstants.ID;
}
}
该类为zhangsan参数处理实现:
import com.kusch.ares.annos.AutoParameterFillConstants;
import org.springframework.stereotype.Component;
@Component
public class ZhangSanAutoParameterFillHandler implements AutoParameterHandler {
@Override
public void handle(Object[] args, int i) {
args[i] = "0000000000000000";
}
@Override
public String support() {
return AutoParameterFillConstants.ZHANG_SAN;
}
}
该类为TestEntity参数处理实现:
import com.kusch.ares.annos.AutoParameterFillConstants;
import com.kusch.ares.annos.TestEntity;
import org.springframework.stereotype.Component;
@Component
public class TestEntityAutoParameterFillHandler implements AutoParameterHandler {
@Override
public void handle(Object[] args, int i) {
TestEntity testEntity = new TestEntity();
testEntity.setId("TestEntityAutoParameterFillHandler");
testEntity.setName("TestEntityAutoParameterFillHandler");
args[i] = testEntity;
}
@Override
public String support() {
return AutoParameterFillConstants.TEST_ENTITY;
}
}
AOP具体实现
import com.kusch.ares.annos.handler.AutoParameterAdapter;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.reflect.MethodSignature;
import org.reflections.Reflections;
import org.springframework.core.MethodParameter;
import org.springframework.stereotype.Component;
import org.springframework.util.ObjectUtils;
import org.springframework.web.method.HandlerMethod;
import javax.annotation.Resource;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;
@Aspect
@Component
public class AutoParameterFillAop {
@Resource
private AutoParameterAdapter autoParameterAdapter;
@Around(value = "@annotation(com.kusch.ares.annos.AutoParameterFill)")
public Object around(ProceedingJoinPoint joinPoint) throws Throwable {
Object[] args = joinPoint.getArgs();
MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
Method method = methodSignature.getMethod();
HandlerMethod handlerMethod = new HandlerMethod(joinPoint.getTarget(), method);
//方法参数
MethodParameter[] methodParameters = handlerMethod.getMethodParameters();
//先获取方法注解,如果没有方法注解再去寻找参数注解
AutoParameterFill annotation = method.getAnnotation(AutoParameterFill.class);
List<String> list = new ArrayList<>();
//获取注解的 includes 属性的值
String[] includes = annotation.includes();
if (ObjectUtils.isEmpty(includes)) {
//获取 AutoParameterFillConstantsBase 所有子类常量类中的所有值
Reflections reflections = new Reflections();
Set<Class<? extends AutoParameterFillConstantsBase>> classes =
reflections.getSubTypesOf(AutoParameterFillConstantsBase.class);
for (Class<? extends AutoParameterFillConstantsBase> item : classes) {
Field[] fields = item.getDeclaredFields();
for (Field field : fields) {
list.add(String.valueOf(field.get(field.getName())));
}
}
} else {
list.addAll(Arrays.asList(includes));
}
//遍历方法参数
for (MethodParameter methodParameter : methodParameters) {
for (String autoParameterFillConstants : list) {
if (autoParameterFillConstants.equals(methodParameter.getParameter().getName())) {
autoParameterAdapter.addParameter(autoParameterFillConstants, args,
methodParameter.getParameterIndex());
}
}
}
return joinPoint.proceed(args);
}
}
开启AOP记得在启动类加上 @EnableAspectJAutoProxy
补充关键jar包:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<!-- 反射工具包 -->
<dependency>
<groupId>org.reflections</groupId>
<artifactId>reflections</artifactId>
<version>0.10.2</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
</dependency>
使用方式
将你自己的参数名编写到 AutoParameterFillConstants
中,你也可以自己新建常量类,继承AutoParameterFillConstantsBase
即可。
实现AutoParameterHandler
接口,完成其中两个方法的编写。
在要填充的接口上,加上该注解,例如上述controller
@AutoParameterFill
@RequestMapping("/test1")
public Object test1(@RequestParam(required = false) String id,
@RequestParam(required = false) String zhangsan,
@RequestBody TestEntity testEntity) {
return id + "----" + zhangsan + "----" + testEntity;
}
不带参数,就说明只要参数名和 常量类中的匹配上,并且存在对应的实现类,就会自动填充参数。
带参数例如 @AutoParameterFill(includes = {AutoParameterFillConstants.ID,AutoParameterFillConstants.ZHANG_SAN})
这就代表这个接口只需要填充id和张三两个属性。
到此这篇关于SpringBoot使用AOP与注解实现请求参数自动填充流程详解的文章就介绍到这了,更多相关SpringBoot参数自动填充内容请搜索编程网以前的文章或继续浏览下面的相关文章希望大家以后多多支持编程网!