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如何序列化/反序列化整数列表?有了这个库,Quirk能做到这一点吗?

csv java

womplefrog · 技术社区 · 4 年前

哟。

我正在尝试这个新的CSV库怪癖CSV。我已经将其用于基本对象,但我正在尝试找出如何序列化/反序列化整数列表。这可能与怪癖有关吗?

     public static void main(String[] args) throws IOException {
            CSVProcessor<Client> parser = new CSVProcessor<>(Client.class);
            String header = "ID,NAME,AGENTS\n";
            String data = "1,client,2|4|66";
            List<Client> list = parser.parse(new StringReader(header+data), CSVFormat.DEFAULT.withIgnoreHeaderCase());
            StringWriter sw = new StringWriter();
            parser.write(list,sw,CSVFormat.DEFAULT);
            System.out.println(sw);
        }
    
        @CSVReadComponent(type = CSVType.NAMED)
        @CSVWriteComponent(type = CSVType.NAMED)
        public static class Client{
    
            @CSVReadBinding(header = "id")
            @CSVWriteBinding(header = "id")
            private long id;
    
            @CSVReadBinding(header = "name")
            @CSVWriteBinding(header = "name")
            private String name;
            
    
            @CSVReadBinding(header = "agents")
            @CSVWriteBinding(header = "agents")
            private List<Integer> agentIds;
            // Getters & Setters
            
        }

,,,

0 回复 | 直到 4 年前

Austin Poole 4 年前

很高兴看到有人用这个。

我是 Quirk-CSV .这个用例解决起来还不错。您可以使用这样的内联包装器:

 @CSVReadBinding(header = "agents", wrapper = AgentsReadWrapper.class)
 @CSVWriteBinding(header = "agents", wrapper = AgentsWriteWrapper.class)
 private List<Integer> agentIds;



public static class AgentsReadWrapper implements ReadWrapper<List<Integer>> {

    @Override
    public List<Integer> apply(String str) {
        if(Objects.isNull(str) || str.trim().isEmpty()){
            return new ArrayList<>();
        }
        return Arrays.stream(str.split("\\|"))
                .map(String::trim)
                .map(Integer::valueOf)
                .collect(Collectors.toList());
    }
}

public static class  AgentsWriteWrapper implements WriteWrapper<List<Integer>>{

    @Override
    public String apply(List<Integer> str) {
        StringJoiner sj = new StringJoiner("|");
        str.stream().map(String::valueOf).forEach(sj::add);
        return sj.toString();
    }
}