冰风2-缓存

来源：互联网发布：张国荣唱功知乎编辑：程序博客网时间：2024/06/08 06:57

缓存

1.CacheUnit

package com.xf.common.unit;import java.util.ArrayList;import java.util.Iterator;import java.util.List;import org.apache.commons.beanutils.BeanUtils;import com.xf.common.util.StringUtil;/**  * * @author 董晓峰 * @datetime 2017年8月4日 下午6:10:09 * @editnote  *   */public abstract class CacheUnit {    private String DMZL = "";    private String fieldID = "id";    private String fieldMC = "mc";    private String fieldKey = "key";    private String fieldValue = "value";    public List listDM = new ArrayList();    public String getDMZL() {        return this.DMZL;    }    public void setDMZL(String dMZL) {        DMZL = dMZL;    }    public String getFieldID() {        return this.fieldID;    }    public void setFieldID(String fieldID) {        this.fieldID = fieldID;    }    public String getFieldMC() {        return this.fieldMC;    }    public void setFieldMC(String fieldMC) {        this.fieldMC = fieldMC;    }    public String getFieldKey() {        return this.fieldKey;    }    public void setFieldKey(String fieldKey) {        this.fieldKey = fieldKey;    }    public String getFieldValue() {        return this.fieldValue;    }    public void setFieldValue(String fieldValue) {        this.fieldValue = fieldValue;    }    public List getDMList(String dmlb) {        return this.listDM;    }    public Object getDMByID(String dmlb, String id) {        try {            Iterator iter = this.listDM.iterator();            while (iter.hasNext()) {                Object obj = iter.next();                String tid = BeanUtils.getProperty(obj, getFieldID());                if (id.equals(tid)){                    return obj;                }            }        } catch (Exception e) {            return null;        }        return null;    }    public Object getDMByKey(String dmlb, String strKey) {        try {            Iterator iter = this.listDM.iterator();            while (iter.hasNext()) {                Object obj = iter.next();                String key = BeanUtils.getProperty(obj, getFieldKey());                if (key == null) {                    continue;                }                if (key.equals(strKey)) {                    return obj;                }            }        } catch (Exception ex) {            ex.printStackTrace();            return null;        }        return null;    }    public String getMCByID(String dmlb, String id) {        Object obj = getDMByID(dmlb, id);        if (obj == null || StringUtil.isEmpty(id))            return null;        try {            return BeanUtils.getProperty(obj, getFieldMC());        } catch (Exception ex) {        }        return null;    }    /**     * 通过key值得到名称     *     * @param dmlb（缓存的类比）     * @param strKey key值     * @return 名称mc     * @datetime 2017年9月26日 上午11:04:11     * @editnote      *     */    public String getMCByKey(String dmlb, String strKey) {        Object obj = getDMByKey(dmlb, strKey);        if (obj == null || StringUtil.isEmpty(strKey))            return null;        try {            return BeanUtils.getProperty(obj, getFieldMC());        } catch (Exception ex) {        }        return null;    }}

注：

这里面的StringUtil类为我自己写的工具类，详细查看文章中的Util模块。
这的StrinUitl.isEmpty方法功能是判断字符串是否为空
BeanUtis为引入的jar包。可在冰风1里面查看

2.CacheUnitUSER

package com.xf.common.unit;import java.util.List;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import com.xf.common.util.SpringUtil;import com.xf.dao.base.PublicDao;import com.xf.entity.table.GG_USER;import com.xf.exception.MisException;/**  * * @author 董晓峰 * @datetime 2017年8月4日 下午9:49:41 * @editnote  *   */public class CacheUnitUSER extends CacheUnit {    private static final Log log = LogFactory.getLog(CacheUnitUSER.class);    public CacheUnitUSER(){        setDMZL("USER");        setFieldID("id");        setFieldMC("name");        setFieldKey("username");        PublicDao publicDao = (PublicDao) SpringUtil.getBean("publicDao");        try {            List<GG_USER> listUser = publicDao.listAllUser();            this.listDM = listUser;        } catch (Exception e) {            log.error(e);            throw new MisException(e);        }    }}

注：
想加入那张表就再写一个类继承CacheUnit 就好了

3.最后写一个工厂类

package com.xf.common.unit;import java.util.HashMap;import com.xf.common.util.StringUtil;/**  * * @author 董晓峰 * @datetime 2017年8月4日 下午6:12:01 * @editnote  *   */public class CacheFactory {    private static CacheFactory dmFactory = new CacheFactory();    private static HashMap<String, CacheUnit> hmDMZL = new HashMap<String, CacheUnit>();    public static CacheFactory getInstance() {        return dmFactory;    }    public static CacheUnit factory(String dmlb) {        if(hmDMZL.containsKey(dmlb)){            return hmDMZL.get(dmlb);        }        return createDm(dmlb);    }    private static CacheUnit createDm(String dmlb){        CacheUnit dm = null;        if(StringUtil.isEmpty(dmlb)){            return null;        }        if(dmlb.equals("USER")){            dm = new CacheUnitUSER();        }        hmDMZL.put(dmlb, dm);        return dm;    }    /**     * 清理全部缓存     * @datetime 2017年8月4日 下午10:01:17     * @editnote      *     */    public static void clear() {        for (String key : hmDMZL.keySet()) {            CacheUnit unit = hmDMZL.get(key);            unit.listDM = null;            unit = null;        }        hmDMZL.clear();    }    /**     * 清理指定代码表缓存     * @param dmlb     * @datetime 2017年8月4日 下午10:01:44     * @editnote      *     */    public static void clear(String dmlb) {        if (hmDMZL.containsKey(dmlb)) {            CacheUnit unit = hmDMZL.get(dmlb);            hmDMZL.remove(dmlb);            unit.listDM = null;            unit = null;        }    }}

到这里缓存基本上已经写完了。

4.还可以用单例模式写一个类来调用缓存

package com.xf.common;import java.util.List;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import com.xf.common.unit.CacheFactory;import com.xf.common.unit.CacheUnit;/** * 缓存  * * @author 董晓峰 * @datetime 2017年8月4日 下午6:07:23 * @editnote 缓存的表有 GG_USER GG_DMNR * */public class DMLoader {    private static final Log log = LogFactory.getLog(DMLoader.class);    private static DMLoader dmLoader = null;    private DMLoader(){    }    public static DMLoader getInstance(){        if(dmLoader == null){            dmLoader = new DMLoader();        }        return dmLoader;    }    /**获取全部代码*/    public static List<?> getDMList(String dmlb) {        CacheUnit flyweight = CacheFactory.factory(dmlb);        return flyweight.getDMList(dmlb);    }    /**根据ID获得这个对象*/    public static Object getDMByID(String dmlb, String id) {        CacheUnit flyweight = CacheFactory.factory(dmlb);        return flyweight.getDMByID(dmlb, id);    }    /**根据主键获取这个对象*/    public static Object getDMByKey(String dmlb, String key) {        CacheUnit flyweight = CacheFactory.factory(dmlb);        return flyweight.getDMByKey(dmlb, key);    }    /**根据ID获得名称*/    public static String getMCByID(String dmlb, String id) {        CacheUnit flyweight = CacheFactory.factory(dmlb);        String strMC = flyweight.getMCByID(dmlb, id);        return strMC;    }    /**根据Key获得这个名称*/    public static String getMCByKey(String dmlb, String key) {        CacheUnit flyweight = CacheFactory.factory(dmlb);        String strMC = flyweight.getMCByKey(dmlb, key);        return strMC;    }    /**     * 代码类别清理:dmlb     *     * @param dmlb     * @author 董晓峰     * @datetime 2017年8月5日 上午12:04:21     * @editnote      *     */    public static void clear(String dmlb) {        CacheFactory.clear(dmlb);        log.info("代码类别清理:" + dmlb);    }    /**     * 代码类别清理:全部     *     * @author 董晓峰     * @datetime 2017年8月5日 上午12:04:07     * @editnote      *     */    public static void clear() {        CacheFactory.clear();        log.info("代码类别清理:全部");    }}

5.把DMLoader里的方法加入自定义标签中

阅读全文

0 0