Netty学习之七—— 编解码技术性能对比

电玩女神 2022-02-21 16:50 187阅读 0赞

# 1、Java序列化的缺点 #

1、无法跨语言；

2、序列化后的码流太大；

测试代码如下：

package com.netty.pojo;
    
    import java.io.Serializable;
    import java.nio.ByteBuffer;
    
    public class User implements Serializable{
    
        private static final long serialVersionUID = 1L;
    
        private String name;
    
        private int id;
    
        public User buildName(String name) {
            this.name = name;
            return this;
        }
    
        public User buildId(int id) {
            this.id = id;
            return this;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public int getId() {
            return id;
        }
    
        public void setId(int id) {
            this.id = id;
        }
    
        /**
         * 运用 ByteBuffer 的二进制编解码技术对 User 对象进行编码
         * @return
         */
        public byte[] codeC(ByteBuffer buffer) {
            buffer.clear();
            byte[] value = this.name.getBytes();
            buffer.putInt(value.length);
            buffer.put(value);
            buffer.putInt(this.id);
            buffer.flip();
            value = null;
            byte[] result = new byte[buffer.remaining()];
            buffer.get(result);
            return result;
        }
    }

运行结果：![20190411105349435.png][]

jdk编码是 二进制编码方式的 4倍。

3、序列化性能太低；

测试代码如下：

package com.netty.codec;
    
    import com.netty.pojo.User;
    
    import java.io.ByteArrayOutputStream;
    import java.io.IOException;
    import java.io.ObjectOutputStream;
    import java.nio.ByteBuffer;
    
    public class PerformTestUser {
        public static void main(String[] args) throws IOException {
            User u = new User();
            u.buildId(100).buildName("Welcome to Netty");
            int loop = 100_0000;
            ByteArrayOutputStream out;
            ObjectOutputStream os;
            long startTime = System.currentTimeMillis();
            for (int i = 0; i < loop; i++) {
                out = new ByteArrayOutputStream();
                os = new ObjectOutputStream(out);
                os.writeObject(u);
                os.flush();
                os.close();
                byte[] b = out.toByteArray();
                out.close();
            }
            long endTime = System.currentTimeMillis();
            System.out.println("The jdk serializable cost time is : " + (endTime - startTime) + " ms");
            System.out.println("-----------------------------------------");
            startTime = System.currentTimeMillis();
            ByteBuffer buffer = ByteBuffer.allocate(1024);
            for (int i=0;i<loop;i++) {
                byte[] b = u.codeC(buffer);
            }
            endTime = System.currentTimeMillis();
            System.out.println("The ByteBuffer serializable  cost time is : " + (endTime - startTime) + " ms");
        }
    }

运行结果：

![2019041111032254.png][]

结果很明显，jdk编码速度很差。

# 2、业界主流的编解码框架 #

1、Google的 Protobuf

2、Facebook 的 Thrift

3、JBoss Marshalling

[20190411105349435.png]: /images/20220221/5157dcc1d6a44666b531560966deb2f1.png
[2019041111032254.png]: /images/20220221/86b5ada9320d4e0e94a3a177cd63ca08.png