依赖jar：

commons-beanutils-1.9.3.jar​

commons-collections-3.1.jar

commons-lang-2.4.jar

commons-logging-1.2.jar

ezmorph-1.0.6.jar

json-lib-2.4-jdk15.jar

直接上程序

1、Person.java:

import java.util.List;

/** * Created by Administrator on 2017/5/6. */public class Person {    private int id;    private String name;    private List<Address> addresses;

    public int getId() {        return id;    }

    public void setId(int id) {        this.id = id;    }

    public String getName() {        return name;    }

    public void setName(String name) {        this.name = name;    }

    public List<Address> getAddresses() {        return addresses;    }

    public void setAddresses(List<Address> addresses) {        this.addresses = addresses;    }

    @Override    public String toString() {        return "Person{" +                "id=" + id +                ", name='" + name + '\'' +                ", addresses=" + addresses +                '}';    }}

2、Address.java:

public class Address {    private String name;

    public String getName() {        return name;    }

    public void setName(String name) {        this.name = name;    }

    @Override    public String toString() {        return "Address{" +                "name='" + name + '\'' +                '}';    }}

3、主函数

import net.sf.json.JSONObject;import net.sf.json.JsonConfig;import net.sf.json.processors.PropertyNameProcessor;

import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;

/** * * Created by Administrator on 2017/5/7. */public class JsonUpperCaseTest {    public static void main(String[] args) {

        Person person = new Person();        person.setId(1);        person.setName("xiaoming");        List<Address> addresses = new ArrayList<Address>();        Address address = new Address();        address.setName("xian");        addresses.add(address);        person.setAddresses(addresses);

        Map<String,Class<?>> classMap = new HashMap<String,Class<?>>();        classMap.put("addresses", Address.class);        //bean小写转大写        JsonConfig config=new JsonConfig();        config.setRootClass(Person.class);        config.setClassMap(classMap);        config.setExcludes(new String[]{"xxxxx"});        PropertyNameProcessor upperCasePropertyNameProcessor = new PropertyNameProcessor() {            @Override            public String processPropertyName(Class aClass, String s) {                //把Person对象中的name属性替换为xxxxx                if (aClass == Person.class && s.equals("name")) {                    return "xxxxx";                }                return s.substring(0,1).toUpperCase() + s.substring(1);            }        };

        config.registerJsonPropertyNameProcessor(Person.class, upperCasePropertyNameProcessor);        config.registerJsonPropertyNameProcessor(Address.class, upperCasePropertyNameProcessor);        //首字母大写 fromObject方法中，第一个参数是Object的时候，config才生效。String不生效        JSONObject jsonObject = JSONObject.fromObject(person,config);        //过滤person中的name，保留address中的name        jsonObject = JSONObject.fromObject(jsonObject,config);        System.out.println(jsonObject);    }}

程序说明：javabean转首字母大写的json串，并且过滤person中的name属性

4、运行结果{"Id":1,"Addresses":[{"Name":"xian"}]}