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我对 Java 很陌生,尤其是对 Maven 尤其是 protostuff 项目(protostuff 网站)很陌生。我需要使用 protostuff 将 XML 序列化/反序列化为谷歌的 protobuf 格式。我尝试使用protobuf-java-format包,但是在反序列化中有一个记录错误,这对我来说是一个阻碍(问题 37)。

到目前为止,我已经完成了以下工作:

  1. 下载 protostuff-1.3.1 并提取它。
  2. Ran mvn integration-testmvn install并且mvn package所有步骤都成功了。
  3. 然后我创建了一个新的 Maven 项目并包含了一个原型,如此处所述
  4. 然后我修改了我的 pom.xml 并按照上述链接protostuff:compile中的描述在 proto 上运行,生成以下 Person.java 文件

    // Generated by http://code.google.com/p/protostuff/ ... DO NOT EDIT!
    // Generated from foo.proto
    
    package com.example.foo;
    
    import java.io.Externalizable;
    import java.io.IOException;
    import java.io.ObjectInput;
    import java.io.ObjectOutput;
    
    import com.dyuproject.protostuff.ByteString;
    import com.dyuproject.protostuff.GraphIOUtil;
    import com.dyuproject.protostuff.Input;
    import com.dyuproject.protostuff.Message;
    import com.dyuproject.protostuff.Output;
    import com.dyuproject.protostuff.Schema;
    import com.dyuproject.protostuff.UninitializedMessageException;
    
    public final class Person implements Externalizable, Message<Person>, Schema<Person>
    {
        public enum Gender implements com.dyuproject.protostuff.EnumLite<Gender>
        {
            MALE(1),
            FEMALE(2);
    
            public final int number;
    
            private Gender (int number)
            {
                this.number = number;
            }
    
            public int getNumber()
            {
                return number;
            }
    
            public static Gender valueOf(int number)
            {
                switch(number) 
                {
                    case 1: return MALE;
                    case 2: return FEMALE;
                    default: return null;
                }
            }
        }
    
    
        public static Schema<Person> getSchema()
        {
            return DEFAULT_INSTANCE;
        }
    
        public static Person getDefaultInstance()
        {
            return DEFAULT_INSTANCE;
        }
    
        static final Person DEFAULT_INSTANCE = new Person();
    
        static final String DEFAULT_MOTTO = ByteString.stringDefaultValue("When the cat is away, the mouse is alone!");
        static final Gender DEFAULT_GENDER = Gender.MALE;
    
        private Integer id;
        private String name;
        private String motto = DEFAULT_MOTTO;
        private Gender gender;
    
        public Person()
        {
    
        }
    
        public Person(
            Integer id
        )
        {
            this.id = id;
        }
    
        // getters and setters
    
        // id
    
        public Integer getId()
        {
            return id;
        }
    
        public void setId(Integer id)
        {
            this.id = id;
        }
    
        // name
    
        public String getName()
        {
            return name;
        }
    
        public void setName(String name)
        {
            this.name = name;
        }
    
        // motto
    
        public String getMotto()
        {
            return motto;
        }
    
        public void setMotto(String motto)
        {
            this.motto = motto;
        }
    
        // gender
    
        public Gender getGender()
        {
            return gender == null ? Gender.MALE : gender;
        }
    
        public void setGender(Gender gender)
        {
            this.gender = gender;
        }
    
        // java serialization
    
        public void readExternal(ObjectInput in) throws IOException
        {
            GraphIOUtil.mergeDelimitedFrom(in, this, this);
        }
    
        public void writeExternal(ObjectOutput out) throws IOException
        {
            GraphIOUtil.writeDelimitedTo(out, this, this);
        }
    
        // message method
    
        public Schema<Person> cachedSchema()
        {
            return this;
        }
    
        // schema methods
    
        public Person newMessage()
        {
            return new Person();
        }
    
        public Class<Person> typeClass()
        {
            return Person.class;
        }
    
        public String messageName()
        {
            return Person.class.getSimpleName();
        }
    
        public String messageFullName()
        {
            return Person.class.getName();
        }
    
        public boolean isInitialized(Person message)
        {
            return 
                message.id != null;
        }
    
        public void mergeFrom(Input input, Person message) throws IOException
        {
            for(int number = input.readFieldNumber(this);; number = input.readFieldNumber(this))
            {
                switch(number)
                {
                    case 0:
                        return;
                    case 1:
                        message.id = input.readInt32();
                        break;
                    case 2:
                        message.name = input.readString();
                        break;
                    case 3:
                        message.motto = input.readString();
                        break;
                    case 4:
                        message.gender = Gender.valueOf(input.readEnum());
                        break;
                    default:
                        input.handleUnknownField(number, this);
                }   
            }
        }
    
    
        public void writeTo(Output output, Person message) throws IOException
        {
            if(message.id == null)
                throw new UninitializedMessageException(message);
            output.writeInt32(1, message.id, false);
    
            if(message.name != null)
                output.writeString(2, message.name, false);
    
            if(message.motto != null && message.motto != DEFAULT_MOTTO)
                output.writeString(3, message.motto, false);
    
            if(message.gender != null)
                 output.writeEnum(4, message.gender.number, false);
        }
    
        public String getFieldName(int number)
        {
            switch(number)
            {
                case 1: return "id";
                case 2: return "name";
                case 3: return "motto";
                case 4: return "gender";
                default: return null;
            }
        }
    
        public int getFieldNumber(String name)
        {
            final Integer number = __fieldMap.get(name);
            return number == null ? 0 : number.intValue();
        }
    
        private static final java.util.HashMap<String,Integer> __fieldMap = new java.util.HashMap<String,Integer>();
        static
        {
            __fieldMap.put("id", 1);
            __fieldMap.put("name", 2);
            __fieldMap.put("motto", 3);
            __fieldMap.put("gender", 4);
        }
    
    }
    

我正在 Eclipse(Luna 版本)中构建整个项目,它为上述文件提供了错误“无法解析导入 com.dyuproject”。我不明白为什么它会给出错误或如何查找/安装包以便 Eclipse 可以看到它。Maven应该构建/提供它吗?

我在 VirtualBox VM 上运行 CentOS 6.4 版(最终版):

uname -a Linux localhost.localdomain 2.6.32-358.18.1.el6.x86_64 #1 SMP Wed Aug 28 17:19:38 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux `

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1 回答 1

1

看起来您使用的是不兼容protostuff-coreprotostuff-maven-plugin版本。

从 1.1 版开始,protostuff 使用 packageio.protostuff而不是com.dyuproject.protostuff. Protostuff 依赖版本和 protostuff maven 插件版本应该相等(1.3.5 是最新版本)。

是一个protostuff-maven-plugin用于代码生成的 maven 项目示例。

于 2015-05-30T16:15:36.040 回答