json串解析，成员变量大写字母开头

com.fasterxml.jackson.databind.ObjectMapper

 jackson可以方便地实现对象和json字串的转换，但是如果json字串的键是大写字母开头的话，默认情况下会出错。如何处理在这里有说明：http://unmi.cc/jackson-java-object-json-string。使用ObjectMapper的setPropertyNamingStrategy方法。首先自己定义个描述大写字母开头的类

import com.fasterxml.jackson.databind.PropertyNamingStrategy.PropertyNamingStrategyBase;

public class UpperCasePropertyNamingStrategy extends PropertyNamingStrategyBase {

private static final long serialVersionUID = -5054105970777634248L;

@Override

public String translate(String propertyName) {

String name = propertyName.replaceAll("^\\w", propertyName.toUpperCase().substring(0,1));

return name;

}

}

这样使用

import com.fasterxml.jackson.databind.ObjectMapper;

...

ObjectMapper mapper = new ObjectMapper();

mapper.setPropertyNamingStrategy(new UpperCasePropertyNamingStrategy());

mapper.setDateFormat(...);

DataParams p = mapper.readValue(source, DataParams.class);

有时不是直接返回一个对象，而是一个对象数据或集合，这时可以这样写

import com.fasterxml.jackson.core.type.TypeReference;

...

DataParams jsonArray = mapper.readValue(source, DataParams[].class);

List<DataParams > jsonArray = mapper.readValue(source, new TypeReference<List<DataParams >>() {});

或者

List<DataParams > jsonArray = mapper.readValue(source, mapper.getTypeFactory().constructCollectionType(List.class, DataParams .class));

示例来自这里： http://stackoverflow.com/questions/6349421/how-to-use-jackson-to-deserialise-an-array-of-objects