接口KeyGenerator

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要实现自定义，要实现spring提供的接口KeyGenerator

package org.springframework.cache.interceptor;

helper

fastjson

public class JsonHelper {

/**

* Java对象序列化为JSON字符串

*

* @param obj Java对象

* @return json字符串

*/

public static String toJson(Object obj) {

return JSON.toJSONString(obj, SerializerFeature.WriteMapNullValue);

}

}

beanHelper

package com.ghgcn.mysb.chapter03.helper;

import org.springframework.util.ClassUtils;

import java.net.URI;

import java.net.URL;

import java.util.Date;

import java.util.Locale;

public class BeanHelper {

/**

* 判断是否是简单值类型.包括：基础数据类型、CharSequence、Number、Date、URL、URI、Locale、Class;

*

* @param clazz

* @return

*/

public static boolean isSimpleValueType(Class> clazz) {

return (ClassUtils.isPrimitiveOrWrapper(clazz) || clazz.isEnum() || CharSequence.class.isAssignableFrom(clazz)

|| Number.class.isAssignableFrom(clazz) || Date.class.isAssignableFrom(clazz) || URI.class == clazz

|| URL.class == clazz || Locale.class == clazz || Class.class == clazz);

}

}

SpringCacheKeyGenerator

package com.ghgcn.mysb.chapter03.support;

import com.ghgcn.mysb.chapter03.helper.BeanHelper;

import com.ghgcn.mysb.chapter03.helper.JsonHelper;

import org.springframework.cache.interceptor.KeyGenerator;

import java.lang.reflect.Method;

@Component //标记为组件

public class SpringCacheKeyGenerator implements KeyGenerator {

private final static int NO_PARAM_KEY = 0;

private String keyPrefix = "jf";// key前缀，用于区分不同项目的缓存，建议每个项目单独设置

@Override

public Object generate(Object target, Method method, Object... params) {

char sp = ':';

StringBuilder strBuilder = new StringBuilder(30);

strBuilder.append(keyPrefix);

strBuilder.append(sp);

// 类名

strBuilder.append(target.getClass().getSimpleName());

strBuilder.append(sp);

// 方法名

strBuilder.append(method.getName());

strBuilder.append(sp);

if (params.length > 0) {

// 参数值

for (Object object : params) {

if (BeanHelper.isSimpleValueType(object.getClass())) {

strBuilder.append(object);

} else {

strBuilder.append(JsonHelper.toJson(object).hashCode());

}

}

} else {

strBuilder.append(NO_PARAM_KEY);

}

return strBuilder.toString();

}

public String getKeyPrefix() {

return keyPrefix;

}

public void setKeyPrefix(String keyPrefix) {

this.keyPrefix = keyPrefix;

}

}