ObjectToJson.java
复制代码 代码如下:
package com.ObjectToJson;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Iterator;
public class ObjectToJson {
public static String ObjListToJson(ArrayList<?> list){
StringBuilder build=new StringBuilder();
//迭代器
Iterator<?> iterator=list.iterator();
build.append("[");
String separate="";
while(iterator.hasNext()){
build.append(separate);
//object转json字符串
String str=ObjToJson(iterator.next());
build.append(str);
separate=",";
}
build.append("]");
return build.toString();
}
@SuppressWarnings("unchecked")
public static String ObjToJson(Object obj){
StringBuilder build=new StringBuilder();
build.append("{");
@SuppressWarnings("rawtypes")
Class cla=null;
try {
//反射加载类
cla=Class.forName(obj.getClass().getName());
} catch (ClassNotFoundException e) {
System.out.println(obj.getClass().toString().concat(" 未找到这个类"));
e.printStackTrace();
return null;
}
StringBuffer methodname=new StringBuffer();
//获取java类的变量
Field[] fields=cla.getDeclaredFields();
String separate="";
for(Field temp:fields){
build.append(separate);
build.append(""");
build.append(temp.getName());
build.append("":");
methodname.append("get");
methodname.append(temp.getName().substring(0,1).toUpperCase());
methodname.append(temp.getName().substring(1));
build.append(""");
Method method=null;
try {
//获取java的get方法
method=cla.getMethod(methodname.toString());
} catch (NoSuchMethodException | SecurityException e) {
methodname.setLength(0);
e.printStackTrace();
}
try {
//执行get方法，获取变量参数的直。
build.append(method.invoke(obj));
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
build.append(""");
methodname.setLength(0);
separate=",";
}
build.append("}");
return build.toString();
}
}
Test.java
复制代码 代码如下:
package com.test;
import java.util.ArrayList;
import com.ObjectToJson.ObjectToJson;
public class Test {
public static void main(String[] args){
//数据构建
ArrayList<User> list=getlist();
//数据转换
String listjson=ObjectToJson.ObjListToJson((ArrayList<?>)list);
System.out.println("{"data":"+listjson+"}");
}
public static ArrayList<User> getlist(){
User user00=new User();
user00.setUserage("27");
user00.setUsername("smart");
user00.setUsersex("man");
User user01=new User();
user01.setUserage("27");
user01.setUsername("smart00");
user01.setUsersex("man");
ArrayList<User> list=new ArrayList<User>();
list.add(user00);
list.add(user01);
return list;
}
}
User.java
复制代码 代码如下:
package com.test;
public class User {
private String username;
private String usersex;
private String userage;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getUsersex() {
return usersex;
}
public void setUsersex(String usersex) {
this.usersex = usersex;
}
public String getUserage() {
return userage;
}
public void setUserage(String userage) {
this.userage = userage;
}
}
测试结果
复制代码 代码如下:
{"data":[{"username":"smart","usersex":"man","userage":"27"},{"username":"smart00","usersex":"man","userage":"27"}]}
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