我是Java的新手，尤其是Maven的新手，尤其是protostuff项目（protostuff website）。我需要使用protostuff将XML序列化/反序列化为Google的protobuf格式。我尝试使用protobuf-java-format包，但是反序列化中有一个已记录的错误，这对我来说是个制止符（issue 37）。
到目前为止，我已经完成了以下工作：
下载protostuff-1.3.1并解压缩。
运行mvn integration-test，mvn install和mvn package，所有步骤均成功。
然后，我创建了一个新的Maven项目，并包含一个here所述的原型。
然后，我修改了pom.xml并按照aforementioned link所述在原型上运行protostuff:compile，生成了以下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，它为上述文件给出了错误“无法解析导入com.dyuproject”。我不明白为什么它会给出错误或如何找到/安装该软件包，以便Eclipse可以看到它。 Maven应该建立/提供吗？
我在VirtualBox VM上运行CentOS版本6.4（最终版）：
uname -aLinux 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`
最佳答案
看起来您正在使用不兼容的protostuff-core和protostuff-maven-plugin版本。
从1.1版开始，protostuff使用包io.protostuff而不是com.dyuproject.protostuff。 Protostuff依赖版本和Protostuff Maven插件版本应相等（最新版本为1.3.5）。
Here是使用protostuff-maven-plugin进行代码生成的Maven项目的示例。