redis在java项目中的使用
redis 存储形式都是 key-value（键值对），按照存储的内容分为两种，一种是存简单数据，即数字，字符串等，可以用 string-value 的形式存储；另一种是存对象、集合等，最好用序列化的方式来存储。
1、存储简单数据
try { Jedis jedis = new Jedis(); jedis.set("name", "JackGSmith"); } catch (Exception e) { //如果缓存连不上，则不处理 System.out.println("登录无法更新该用户缓存");}
从 redis 缓存中获取 key 为“name”的值，使用 jedis.get("name"), 用一个 String 变量接收即可。
2、存储对象、集合
存对象集合用序列化的方式存储，用反序列化的方式取值。存储的 key 和 value 都是转化成字节码的形式。
先定义一个抽象类：SerializeTranscoder.java, 代码如下：
package cn.com.taiji.sample.utils;import java.io.Closeable;
import java.io.IOException;public abstract class SerializeTranscoder {
</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">public</span> <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">abstract</span> <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">byte</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">[] serialize(Object value); </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">public</span> <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">abstract</span> Object deserialize(<span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">byte</span>[] in) <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">throws</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> IOException; </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">public</span> <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">void</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> close(Closeable closeable) { </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">if</span> (closeable != <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">null</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">) { </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">try</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> { closeable.close(); } </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">catch</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> (Exception e) { e.printStackTrace(); } } }}
再建一个序列化的类，ObjectTranscoder.java，继承上面这个抽象类，该类是用来序列化存储对象用的，代码如下：
package cn.com.taiji.sample.utils;import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;public class ObjectTranscoder<M extends Serializable> extends SerializeTranscoder{
@SuppressWarnings(</span>"unchecked"<span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">) @Override </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">public</span> <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">byte</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">[] serialize(Object value) { </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">if</span> (value == <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">null</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">) { </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">throw</span> <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">new</span> NullPointerException("Can't serialize null"<span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">); } </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">byte</span>[] result = <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">null</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">; ByteArrayOutputStream bos </span>= <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">null</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">; ObjectOutputStream os </span>= <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">null</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">; </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">try</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> { bos </span>= <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">new</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> ByteArrayOutputStream(); os </span>= <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">new</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> ObjectOutputStream(bos); M m </span>=<span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> (M) value; os.writeObject(m); os.close(); bos.close(); result </span>=<span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> bos.toByteArray(); } </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">catch</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> (IOException e) { </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">throw</span> <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">new</span> IllegalArgumentException("Non-serializable object"<span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">, e); } </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">finally</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> { close(os); close(bos); } </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">return</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> result; } @SuppressWarnings(</span>"unchecked"<span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">) @Override </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">public</span> M deserialize(<span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">byte</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">[] in) { M result </span>= <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">null</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">; ByteArrayInputStream bis </span>= <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">null</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">; ObjectInputStream is </span>= <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">null</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">; </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">try</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> { </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">if</span> (in != <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">null</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">) { bis </span>= <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">new</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> ByteArrayInputStream(in); is </span>= <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">new</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> ObjectInputStream(bis); result </span>=<span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> (M) is.readObject(); is.close(); bis.close(); } } </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">catch</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> (IOException e) { e.printStackTrace(); } </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">catch</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> (ClassNotFoundException e) { e.printStackTrace(); } </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">finally</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> { close(is); close(bis); } </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">return</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> result; }}
接着在新建一个 ListTranscoder.java 文件，用来序列化存储 List（集合）对象，基本同上，代码如下：
package cn.com.taiji.sample.utils;import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;public class ListTranscoder<M extends Serializable> extends SerializeTranscoder {
@SuppressWarnings(</span>"unchecked"<span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">) </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">public</span> List<M> deserialize(<span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">byte</span>[] in) <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">throws</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> IOException { List</span><M> list = <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">new</span> ArrayList<><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">(); ByteArrayInputStream bis </span>= <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">null</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">; ObjectInputStream is </span>= <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">null</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">; </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">try</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> { </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">if</span> (in != <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">null</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">) { bis </span>= <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">new</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> ByteArrayInputStream(in); is </span>= <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">new</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> ObjectInputStream(bis); </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">while</span> (<span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">true</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">) { M m </span>=<span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> (M)is.readObject(); </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">if</span> (m == <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">null</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">) { </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">break</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">; } list.add(m); } is.close(); bis.close(); } } </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">catch</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> (Exception e) { </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 128, 0, 1)">//</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 128, 0, 1)"> e.printStackTrace(); </span> } <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">finally</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> { is.close(); bis.close(); } </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">return</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> list; } @SuppressWarnings(</span>"unchecked"<span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">) @Override </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">public</span> <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">byte</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">[] serialize(Object value) { </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">if</span> (value == <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">null</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">) </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">throw</span> <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">new</span> NullPointerException("Can't serialize null"<span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">); List</span><M> values = (List<M><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">) value; </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">byte</span>[] results = <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">null</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">; ByteArrayOutputStream bos </span>= <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">null</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">; ObjectOutputStream os </span>= <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">null</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">; </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">try</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> { bos </span>= <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">new</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> ByteArrayOutputStream(); os </span>= <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">new</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> ObjectOutputStream(bos); </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">for</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> (M m : values) { os.writeObject(m); } results </span>=<span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> bos.toByteArray(); os.close(); bos.close(); } </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">catch</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> (IOException e) { </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">throw</span> <span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">new</span> IllegalArgumentException("Non-serializable object"<span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)">, e); } </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">finally</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> { close(os); close(bos); } </span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 255, 1)">return</span><span style="margin: 0; padding: 0; font-family: "Courier New" !important; font-size: 0.75rem; color: rgba(0, 0, 0, 1)"> results; }}
现在，就可以用序列化的方式存储对象或集合了：
try {
Jedis jedis = new Jedis();
List<SystemNotice> noticeList = systemNoticeManager.listQuery(noticeQModel);
if(noticeList.size()>0 && noticeList != null){
ListTranscoder<SystemNotice> listTranscoder = new ListTranscoder<SystemNotice>();
jedis.set(loginUser.getId().getBytes(), listTranscoder.serialize(noticeList));
}
} catch (Exception e) {
//如果缓存连不上，则不处理
System.out.println("登录无法更新该用户缓存");
}
存的 key 使用用户 id，所以取出 list 就很简单了：
try {
Jedis jedis = new Jedis();
byte[] list = jedis.get(loginUser.getId().getBytes());
ListTranscoder<SystemNotice> listTranscoder = new ListTranscoder<SystemNotice>();
List<SystemNotice> newList = listTranscoder.deserialize(list);try {
responseJson(JsonTools.toJsonStr(newList), response);
} catch (IOException e) {
e.printStackTrace();
}
}
</wiz_tmp_tag>