json，反射实现对象转json

将一个对象转为json 对象

定义实体：

package com.ziv.bean;import java.util.List;public class User {private Integer[] id;private String name;private List<UserDesc> userDescs;public void setId(Integer[] id) {this.id = id;}public Integer[] getId() {return id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public List<UserDesc> getUserDescs() {return userDescs;}public void setUserDescs(List<UserDesc> userDescs) {this.userDescs = userDescs;}public User(Integer[] id, String name, List<UserDesc> userDescs) {super();this.id = id;this.name = name;this.userDescs = userDescs;}
}

package com.ziv.bean;import java.util.List;public class UserDesc {private Integer id;private  String code;private String name;private String[] strings;private List<Opector> opectors;public UserDesc(Integer id, String code, String name, String[] strings,List<Opector> opectors) {super();this.id = id;this.code = code;this.name = name;this.strings = strings;this.opectors = opectors;}public String[] getStrings() {return strings;}public void setStrings(String[] strings) {this.strings = strings;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getCode() {return code;}public void setCode(String code) {this.code = code;}public String getName() {return name;}public void setName(String name) {this.name = name;}public List<Opector> getOpectors() {return opectors;}public void setOpectors(List<Opector> opectors) {this.opectors = opectors;}
}

package com.ziv.bean;import java.util.Date;public class Opector {private Integer id;private String msg;private Date startDate;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}public Date getStartDate() {return startDate;}public void setStartDate(Date startDate) {this.startDate = startDate;}public Opector(Integer id, String msg, Date startDate) {super();this.id = id;this.msg = msg;this.startDate = startDate;}
}

核心类，处理对象

package com.ziv.util.json;import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Date;
import java.util.List;import org.junit.Test;import com.ziv.bean.Opector;
import com.ziv.bean.User;
import com.ziv.bean.UserDesc;public class JSON {/*      传入一个List集合转为json  */public static String getJson(List<?> obj){StringBuffer sb = new StringBuffer();sb.append("[");for (Object object : obj) {sb.append(jsons(object)).append(",");}sb.replace(sb.lastIndexOf(","), sb.length(), "");sb.append("]");return sb.toString();}/*     转入一个对象转为json   */public static String getJson(Object obj){return jsons(obj).toString();}/*  json转换，但是当字段的值为空时，不返回该值  */private static  StringBuffer jsons(Object obj) {if(obj == null) return null;StringBuffer sb = new StringBuffer().append("{");try {Object originalObj = obj;Class clazz = obj.getClass();Field[] fields = clazz.getDeclaredFields();String type = "";       /*  属性的类型   */String name = "";      /*  属性的名称   */for (int i = 0; i < fields.length; i++) {String[] split = fields[i].toString().split(" ");type = split[1].substring(split[1].lastIndexOf(".") + 1);name = split[2].substring(split[2].lastIndexOf(".") + 1);Method get = clazz.getMethod("get" + cap(name));if(type.equalsIgnoreCase("Integer[]") || type.equalsIgnoreCase("Int[]")){Integer[] value = (Integer[]) get.invoke(originalObj);if (value !=null) {sb.append("\""+name+"\": [");for (Integer integer : value) {sb.append(String.valueOf(integer)+",");}sb.replace(sb.lastIndexOf(","), sb.length(), "],");}} else if(type.equalsIgnoreCase("Integer") || type.equalsIgnoreCase("int")){Integer value = (Integer) get.invoke(originalObj);if(value != null){    sb.append("\""+name+"\":"+value+",");}} else if(type.equalsIgnoreCase("String")){String value = (String) get.invoke(originalObj);if(value != null){                     sb.append("\""+name+"\":\""+value+"\",");}} else if(type.equalsIgnoreCase("String[]")){String[] value = (String[]) get.invoke(originalObj);if(value != null){                     sb.append("\""+name+"\": [");for (String string : value) {sb.append("\"").append(String.valueOf(string)).append("\"").append(",");}sb.replace(sb.lastIndexOf(","), sb.length(), "],");}}else if(type.equalsIgnoreCase("Date")){Date value = (Date) get.invoke(originalObj);if(value != null){sb.append("\""+name+"\":"+value.getTime()+",");}}else if(type.equalsIgnoreCase("List")){List<?> arrays = (List<?>)get.invoke(originalObj);if(arrays != null){sb.append("\""+name+"\":[");for (int j = 0; j < arrays.size(); j++) {if(j == arrays.size() -1){sb.append(getJson(arrays.get(j))).append("],");}else{sb.append(getJson(arrays.get(j))).append(",");}}}}}} catch (Exception e) {e.printStackTrace();}sb.replace(sb.lastIndexOf(","), sb.length(), "").append("}");return sb;}/*   将字符串首字母变为大写 */private static String cap(String str) {return str.substring(0,1).toUpperCase() + str.substring(1);}
}

测试

package com.ziv.bean;import java.util.Arrays;
import java.util.Date;
import java.util.List;import javax.swing.JList;import com.ziv.util.json.JSON;public class Test {public static void main(String[] args) {List<Opector> asList = Arrays.asList(new Opector(100001, "登录", new Date()),new Opector(100011, null, new Date()),new Opector(10101, "退出", null));List<UserDesc> udDescs = Arrays.asList(new UserDesc(101,"OK","嘻哈哈",new String[]{"xiao","样"},asList),new UserDesc(102,"休息下来了","哟呵呵",new String[]{"普欧尼","^(*￣(oo)￣)^"},asList));User user = new User(new Integer[]{1,2,3}, "xx", udDescs);List<?> jList = Arrays.asList(new User(null, "xx", null),new User(new Integer[]{1,2,3}, "是的发送到", udDescs),new User(new Integer[]{1,2,3}, null, udDescs),new User(new Integer[]{1,2,3}, "阿斯蒂芬", udDescs));//        System.out.println(JSON.getJson(jList));System.out.println(JSON.getJson(user));}
}

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