将List数据形式转化为JSON形式

Posted 2020-10-10 一望无垠

Action

public String showAllExperts(){
       try {
        list=rescueExpertsService.findRescueExpertsList();
        IJsonGenerator json = SpringContextAssist.getBean(IJsonGenerator.class); //获取转机制
        toMapList = json.getJsonString(list);//将List转化为Json
       } catch (Exception e) {
             e.printStackTrace(); 
       } 
      return "rescue_experts_mapview"; 
   }

SpringContextAssist

package com.hfky.crs.busi.service;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Service;

@Service
public class SpringContextAssist implements ApplicationContextAware {  
    
    private static ApplicationContext context;  

    @Override  
    public void setApplicationContext( ApplicationContext applicationContext ) throws BeansException {  
        context = applicationContext;  
    }  
    
    public static <T> T getBean( String beanName,Class<T> cls ) {  
        return cls.cast( context.getBean( beanName ) );  
    }  
    
    public static <T> T getBean(Class<T> type){
        return context.getBean(type);
    }
} 

IJsonGenerator.class

package com.hfky.crs.busi.service;

import java.util.List;

import com.google.gson.ExclusionStrategy;

public interface IJsonGenerator {
    
    public IJsonGenerator applyDateFormat(String pattern);
    
    /**
     * 将对象实例转换为json字符串
     * @param target  待转换的对象
     * @return  json字符串
     */
    public String getJsonString(Object target);
    
    /**
     * 获取json字符串
     * @param target
     * @param es
     * @return
     */
    public String getJsonString(Object target,ExclusionStrategy es);
    
    /**
     * 
     * @param target
     * @param excluded
     * @return
     */
    public String getJsonString(Object target,Class<?> ... excluded);
    
    /**
     * 从json字符串获取对象实例
     * @param <Type> 结果类类型
     * @param json   json字符串
     * @param cls    类型
     * @return 目标对象
     */
    public <Type> Type getJsonObject(String json,Class<Type> cls );
    
    /**
     * @param <Type>
     * @param json
     * @param cls
     * @return
     */
    public <Type>  List<Type> getListFromJson(String json,Class<Type> cls);
     
}