java序列化/反序列化之xml、protobuf、protostuff 的比较与使用例子

4、protobuf简单教程

4.1、快速入门：

　　下载.exe编译器——编写.proto文件——利用编译器编译.proto文件生成javabean——引用jar包——直接使用javabean自带的序列化、反序列化方法

1、下载针对java的.exe编译器

protobuf编译器官方下载地址：https://developers.google.com/protocol-buffers/docs/downloads

下载不了的：点我

2、编写.proto文件

package tutorial;
option java_package = "com.zjm.www.po";
option java_outer_classname = "Products2"; 
message Products22 { 
  required string s1 = 1;
  required string s2 = 2;
  required string s3 = 3;
  required string s4 = 4;
  required string s5 = 5;
  required string s6 = 6;
  required string s7 = 7;
  required string s8 = 8;
  required string s9 = 9;
  required int32 i10 = 10;
  required int32 i11 = 11;
  required int32 i12 = 12;
  required int32 i13 = 13;
  required int32 i14 = 14;
  required int32 i15 = 15;
  required int32 i16 = 16;
  required int32 i17 = 17;
  required int32 i18 = 18;
  required bool b19 = 19;
  required bool b20 = 20;
  required bool b21 = 21;
  required bool b22 = 22;
  required bool b23 = 23;
  required bool b24 = 24;
  required bool b25 = 25;
  required bool b26 = 26;
  required bool b27 = 27;
  repeated string list = 28;
}

View Code

其中的option java_package代表将要生成的javabean所有的包的包名

其中的option java_outer_classname代表要生成的javabean的类名

其中的message Products22可以理解为一个类似C语言的结构体，在生成的javabean中将变成一个内部类，一个.proto文件可以有无数个message 

proto支持的类型与修饰符可参考该博客：http://blog.sina.com.cn/s/blog_abea023b0101dxce.html

3、利用编译器编译.proto文件生成javabean

把.proto文件放在.exe同个目录下面，打开cmd，进入同目录下，执行命令：

protoc.exe --java_out=./ test.proto

假如.proto文件没有编写错误的话，成功后在同目录下即有javabean的类生成。

4、引用jar包

jar包地址pom.xml：

        <!-- protobuf -->
        <dependency>
            <groupId>com.google.protobuf</groupId>
            <artifactId>protobuf-java</artifactId>
            <version>3.0.0-alpha-2</version>
        </dependency>

5、把刚刚生成的javabean复制到项目中，这里直接使用javabean自带的序列化、反序列化方法

刚刚生成的javabean为：Products2

序列化例子：

public List<byte[]> serializeProtoBufProductsList(
            List<Builder> builderList) {
        if(builderList == null) {
            System.out.println("【ProtoBufSerializeServiceImpl-serializeProtoBufProductsService】builderList==null");
        }
        long start = System.currentTimeMillis();
        List<byte[]> bytesList = new ArrayList<byte[]>();
        for(Products2.Products22.Builder p22Builder : builderList){
            Products2.Products22 p22 = p22Builder.build();
            byte[] bytes = p22.toByteArray();
            bytesList.add(bytes);
        }
        long end = System.currentTimeMillis();
        usedTime = end - start ;
        return bytesList;
    }

builder对象由来：com.zjm.www.po.Products2.Products22.Builder，即可有生成的javabean点出来。

反序列化例子：

    public List<Products22> deserializeProtoBufDataListToProducts22List(
            List<byte[]> bytesList) {
        long start = System.currentTimeMillis();
        List<Products22> list = new ArrayList<Products22>();
        for(byte[] b : bytesList) {
            try {
                list.add(Products2.Products22.parseFrom(b));
            } catch (InvalidProtocolBufferException e) {
                e.printStackTrace();
            }
        }
        long end = System.currentTimeMillis();
        usedTime = end - start;
        return list;
    }

拿出具体字段例子：

                Products22 p = Products2.Products22.parseFrom(b);
                String s1 = p.getS1();
                int i1 = p.getI10();
                boolean b1 = p.getB19();
                ProtocolStringList l = p.getListList();
                
                for(String s : l) {
                    
                }

5、protostuff简单教程

 5.1 快速入门

　　引用jar包——学习语法——直接使用

1、引用jar包：

pom.xml：

        <!-- protostuff -->
        <dependency>
            <groupId>com.dyuproject.protostuff</groupId>
            <artifactId>protostuff-core</artifactId>
            <version>1.0.7</version>
            <optional>true</optional>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.dyuproject.protostuff</groupId>
            <artifactId>protostuff-runtime</artifactId>
            <version>1.0.7</version>
            <optional>true</optional>
            <scope>provided</scope>
        </dependency>

2、javabean：

同上面xml的javabean

3、序列化例子：

public List<byte[]> serializeProtoStuffProductsList(List<Products> pList) {
        if(pList == null  ||  pList.size() <= 0) {
            return null;
        }
        long start = System.currentTimeMillis() ;
        List<byte[]> bytes = new ArrayList<byte[]>();
        Schema<Products> schema = RuntimeSchema.getSchema(Products.class);
        LinkedBuffer buffer = LinkedBuffer.allocate(4096);
        byte[] protostuff = null;
        for(Products p : pList) {
            try {
                protostuff = ProtostuffIOUtil.toByteArray(p, schema, buffer);
                bytes.add(protostuff);
            } finally {
                buffer.clear();
            }
        }
        long end = System.currentTimeMillis() ;
        this.userTime = end - start;
        return bytes;
    }

4、反序列化例子：

    public List<Products> deserializeProtoStuffDataListToProductsList(
            List<byte[]> bytesList) {
        if(bytesList == null || bytesList.size() <= 0) {
            return null;
        }
        long start = System.currentTimeMillis() ;
        Schema<Products> schema = RuntimeSchema.getSchema(Products.class);
        List<Products> list = new ArrayList<Products>();
        for(byte[] bs : bytesList) {
            Products product = new Products();
            ProtostuffIOUtil.mergeFrom(bs, product, schema);
            list.add(product);
        }
        long end = System.currentTimeMillis() ;
        this.userTime = end - start;
        return list;
    }