java - 替换 Google 协议(protocol)数据缓冲区中的字符串

Question

我已成功构建以下 .proto 文件:

package JervisStorage;

option java_package = "TextBase";
option java_outer_classname = "JervisStorage";

message Owner {
  optional string name = 1;
  optional string sex = 2;
  optional string profession = 3;
  optional string email = 4;
}

现在，我成功构建了所有者:

private static Owner owner;
private static FileOutputStream serialOutput;

Owner pusheen= Owner.newBuilder()
                .setName("Siema") 
                .setSex(" ") 
                .setProfession(" ")
                .setEmail(" ")
                .build();

我将对象写入文件并成功从文件中读取对象:

serialOutput = new FileOutputStream("JervisStorage.ser");
pusheen.writeTo(serialOutput);
serialOutput.close();

owner = Owner.parseFrom(new FileInputStream("JervisStorage.ser"));
System.out.println(owner.getName());

问题是我无法替换单条记录，将其写回文件并读取整个更新的对象。我一直在尝试这样做:

owner.toBuilder().setName("newName").build();
System.out.println(owner.getName());
serialOutput = new  FileOutputStream("JervisStorage.ser");
owner.writeTo(serialOutput);
serialOutput.close();

owner = Owner.parseFrom(new FileInputStream("JervisStorage.ser"));
System.out.println(owner.getName());

不幸的是，这种方法似乎不起作用......有人可以帮忙吗？

Answer 1

为什么不这样做

  editedOwner = Owner.newBuilder()
                          .mergeFrom(new FileInputStream("JervisStorage.ser")) 
                          .setName("new name") 
                          .build();

或者你也可以这样做

  editedOwner = owner.toBuilder()
                     .setName("new name") 
                     .build();