4、相关工具类的 编写

1.png

Const ：

package com.mmall.common;

public class Const {
    public static final String CURRENT_USER="currentUser";

    public static final String EMAIL="email";

    public static final String USERNAME="username";

    public interface Role{
        int ROLE_CUSTOMER=0; //普通用户

        int ROLE_ADMIN=1; //管理员

    }
}

ResponseCode ：

package com.mmall.common;

public enum ResponseCode {

    SUCCSEE(0,"SUCCESS"),
    ERROR(1,"ERROR"),
    NEED_LOGIN(10,"NEED_LOGIN"),
    ILLEGAL_ARGUMENT(2,"ILLEGAL_ARGUMENT");

    private final  int code;
    private final String desc;

    ResponseCode(int code,String desc){
        this.code=code;
        this.desc=desc;
    }

    public  int getCode(){
        return code;
    }

    public String getDesc(){
        return desc;
    }
}

ServerResponse ：

package com.mmall.common;

import org.codehaus.jackson.annotate.JsonIgnore;
import org.codehaus.jackson.map.annotate.JsonSerialize;

import java.io.Serializable;

@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)
//保证序列化Json的时候，如果是null的对象，key也会消失
public class ServerResponse<T> implements Serializable {

    private int status;
    private String msg;
    private T data;

    private ServerResponse(int status){
        this.status=status;
    }
    private ServerResponse(int status, String msg){
        this.status=status;
        this.msg=msg;
    }
    private ServerResponse(int status, T data){
        this.status=status;
        this.data=data;
    }
    private ServerResponse(int status, String msg, T data){
        this.status=status;
        this.msg=msg;
        this.data=data;
    }

    @JsonIgnore
 //使之不再Json序列化的结果当中
    public boolean isSussecc(){
        return this.status==ResponseCode.SUCCSEE.getCode();
    }

    public int getStatus(){
        return status;
    }

    public T getData(){
        return data;
    }

    public String getMsg(){
        return msg;
    }


    public static <T> ServerResponse<T> createBySuccess(){
        return new ServerResponse<T>(ResponseCode.SUCCSEE.getCode());
    }

    public static <T> ServerResponse<T> createBySuccessMessage(String msg){
        return new ServerResponse<T>(ResponseCode.SUCCSEE.getCode(),msg);
    }

    public static <T> ServerResponse<T> createBySuccess(T data){
        return new ServerResponse<T>(ResponseCode.SUCCSEE.getCode(),data);
    }

    public static <T> ServerResponse<T> createBySuccessMessage(String msg,T data){
        return new ServerResponse<T>(ResponseCode.SUCCSEE.getCode(),msg,data);
    }

    public static <T> ServerResponse<T> createByError(){
        return new ServerResponse<T>(ResponseCode.ERROR.getCode(),ResponseCode.ERROR.getDesc());
    }

    public static <T> ServerResponse<T> createByErrorMessage(String errorMessage){
        return new ServerResponse<T>(ResponseCode.ERROR.getCode(),errorMessage);
    }

    public static <T> ServerResponse<T> createByErrorCodeMessage(String errorMessage){
        return new ServerResponse<T>(ResponseCode.ERROR.getCode(),errorMessage);
    }
}

TokenCache ：

package com.mmall.common;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.TimeUnit;

public class TokenCache {

    public static Logger logger= LoggerFactory.getLogger(TokenCache.class);

    private static LoadingCache<String,String> localCache= CacheBuilder.newBuilder()
            .initialCapacity(1000)
            .maximumSize(10000)
            .expireAfterAccess(12, TimeUnit.HOURS).build(new CacheLoader<String, String>() {
        //默认的数据加载实现，当调用get取值的时候，如果key没有对应的值，就调用这个方法进行加载
        @Override
        public String load(String s) throws Exception {
            return "null";
        }
    });


    public static void setKey(String key,String value){
        localCache.put(key,value);
    }


    public static String getKey(String key){
        String value=null;

        try{
            value=localCache.get(key);
            if("null".equals(value)){
                return null;
            }

            return value;

        }catch (Exception e){
                logger.error("localCache get error",e);
        }
        return  null;
    }

}