JAVA-任意对象转换成JSON，json转换成指定对象

任意对象转换成JSON

只支持字符和基本类型

代码

package ztf.question3;public class Address {    private String province;    private String street;    public Address() {    }    public Address(String pro,String street){        this.province=pro;        this.street=street;    }    public String getProvince(){        return this.province;    }    public void setProvince(String province){        this.province=province;    }    public String getStreet(){        return this.street;    }    public void setStreet(String street){        this.street=street;    }    @Override    public String toString() {        return "Address [province=" + province + ", street=" + street + "]";    }}

package ztf.question3;import java.io.File;import java.io.FileNotFoundException;import java.io.FileWriter;import net.sf.json.JSON;import net.sf.json.JSONSerializer;public class Application {    public static void main(String[] args){        Person person=new Person();        person.setName("ddd");        person.setAge(23);        Address address=new Address("chonqqing","Hong Guang Street");        person.setAddress(address);        System.out.println(ObjectToJson.writeJson(person.getClass(), person));    }}

package ztf.question3;import java.lang.reflect.Field;import java.lang.reflect.Method;public class ObjectToJson {    public static String writeJson(Class clazz,Object obj){        StringBuilder stringBuilder=new StringBuilder();        try{            stringBuilder.append("{");            Field[] declaredFields = clazz.getDeclaredFields();            for(Field field:declaredFields) {                field.setAccessible(true);                stringBuilder.append("\""+field.getName()+"\":");                Class<?> type = field.getType();                if(type.isPrimitive()||type==String.class) {                     Method m = (Method) clazz.getMethod(                                  "get" + getMethodName(field.getName()));                     stringBuilder.append("\""+m.invoke(obj)+"\"");                }else {                     Method m = (Method) clazz.getMethod(                                  "get" + type.getSimpleName());                       stringBuilder.append(writeJson(field.getType(),m.invoke(obj)));                }                stringBuilder.append(",");            }            return reChange(stringBuilder.toString());        }catch(Exception e){            e.printStackTrace();        }        return null;    }    private static String reChange(String string) {        // TODO Auto-generated method stub        return string.substring(0,string.length()-1)+"}";    }    private static String getMethodName(String name) {        // TODO Auto-generated method stub        return  name.substring(0, 1).toUpperCase() + name.substring(1);    }}

package ztf.question3;public class Person {    private String name;    private int age;    private Address address;    public Person(){        this.name="";    }    public String getName(){        return this.name;    }    public void setName(String name){        this.name=name;    }    public int getAge(){        return this.age;    }    public void setAge(int age){        this.age=age;    }    public Address getAddress(){        return this.address;    }    public void setAddress(Address address){        this.address=address;    }    @Override    public String toString() {        return "Person [name=" + name + ", age=" + age + ", address=" + address + "]";    }}

json转换成指定对象

需要修改代码才能支持其他类型

代码

package ztf.question4;import ztf.question3.Person;public class Application {    public static void main(String[] args){        String json=new String("{\"name\":\"ddd\",\"age\":\"23\",\"address\":{\"province\":\"chonqqing\",\"street\":\"Hong Guang Street\"}}\r\n" +                 "");        System.out.println((Person)JsonToPerson.readJson(json,Person.class));    }}

package ztf.question4;import java.lang.reflect.Field;import java.lang.reflect.Method;import net.sf.json.JSONObject;import ztf.question3.Address;public class JsonToPerson {    public static Object readJson(String json,Class class1) {         JSONObject jsoj = JSONObject.fromObject(json);        try {            Object obj=class1.newInstance();            Field[] fields = class1.getDeclaredFields();            for(Field field:fields) {                Class<?> type = field.getType();                Method method = class1.getMethod("set"+getMethodName(field.getName()),type);                if(type.isPrimitive()||"java.lang.String".equals(type.getName())) {                    //这里应该有更好的解决方法，需要查看其他框架的源码                    if("java.lang.String".equals(type.getName())) {                        method.invoke(obj, jsoj.get(field.getName()));                    }else if("int".equals(type.getName())){                        method.invoke(obj, Integer.valueOf(jsoj.get(field.getName()).toString()));                    }                }else {                    method.invoke(obj, (Address)readJson(jsoj.get(field.getName()).toString(),type));                }            }            return obj;        } catch (Exception e) {            e.printStackTrace();        }        return null;    }    private static String fixEleName(String name) {        int lastIndexOf = name.lastIndexOf('.');        if(lastIndexOf<=-1)            return name;        return name.substring(lastIndexOf+1, lastIndexOf+2).toLowerCase()+name.substring(lastIndexOf+2);    }    private static String getMethodName(String name) {        // TODO Auto-generated method stub        return  name.substring(0, 1).toUpperCase() + name.substring(1);    }}