Jackson-在运行时修改属性而无需注释

您可以使用

PropertyNamingStrategy

class ReplaceNamingStrategy extends PropertyNamingStrategy {    private static final long serialVersionUID = 1L;    private Map<String, String> replaceMap;    public ReplaceNamingStrategy(Map<String, String> replaceMap) {        this.replaceMap = replaceMap;    }    @Override    public String nameForGetterMethod(MapperConfig<?> config, AnnotatedMethod method, String defaultName) {        if (replaceMap.containsKey(defaultName)) { return replaceMap.get(defaultName);        }        return super.nameForGetterMethod(config, method, defaultName);    }}

示例程序如下所示：

import java.io.IOException;import java.util.Collections;import java.util.Map;import com.fasterxml.jackson.databind.ObjectMapper;import com.fasterxml.jackson.databind.PropertyNamingStrategy;import com.fasterxml.jackson.databind.cfg.MapperConfig;import com.fasterxml.jackson.databind.introspect.AnnotatedMethod;public class JacksonProgram {    public static void main(String[] args) throws IOException {        Msg msg = new Msg();        msg.setCode(42);        msg.setData("Are you suggesting coconuts migrate?");        System.out.println(convert(msg, "test"));        System.out.println(convert(msg, "toto"));        System.out.println(convert(msg, "groovy"));    }    public static String convert(Msg msg, String name) throws IOException {        ObjectMapper mapper = new ObjectMapper();        mapper.setPropertyNamingStrategy(new ReplaceNamingStrategy(Collections.singletonMap("data", name)));        return mapper.writevalueAsString(msg);    }}

上面的程序打印：

{"pre":42,"test":"Are you suggesting coconuts migrate?"}{"pre":42,"toto":"Are you suggesting coconuts migrate?"}{"pre":42,"groovy":"Are you suggesting coconuts migrate?"}