数据库查回来数据封装成Javabean再转json(有Date类型不能转json处理方法)

json-lib

  • Javabean转json需要用到json-lib包,它可以把javabean转换成json串
  • jar包

json-lib的核心jar包有:
 
      json-lib.jar

json-lib的依赖jar包有:

commons-lang.jar

commons-beanutils.jar

commons-logging.jar

commons-collections.jar

ezmorph.jar

  • 核心类
	 JSONObject json = JSONObject.fromObject(person);//把对象转换成JSONObject对象
    	
    	JSONArray jsonArray = JSONObject.fromObject(list):把list转换成JSONArray对象 

示例

  • User类
	package com.yuzk.test;
    /**
     * User类
     * @author yuzk
     *
     */
    public class User {
    	private String name;
    	private Integer age;
    	private String address;
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
    	public Integer getAge() {
    		return age;
    	}
    	public void setAge(Integer age) {
    		this.age = age;
    	}
    	public String getAddress() {
    		return address;
    	}
    	public void setAddress(String address) {
    		this.address = address;
    	}
    	@Override
    	public String toString() {
    		return "User [name=" + name + ", age=" + age + ", address=" + address
    				+ "]";
    	}
    	
    }
  • 测试类
    public class test {
    	@Test
    	public void testJson(){
    		User user = new User();
    		user.setName("张三");
    		user.setAge(24);
    		user.setAddress("火星");
    		System.out.println(beanToJson(user));
    	}
    	 public String beanToJson(Object bean) {  
            JSONObject json = JSONObject.fromObject(bean);  
            return json.toString();  
       
        }
    
  • 但是如果从数据库查数据,有日期类型,上述方法不能把Javabean转换为json,需要修改方法,加两行代码
     public String beanToJson2(Object bean) {  
    	    // 用来解决date类型不能转json的方法
    	    JsonConfig jsonConfig = new JsonConfig();  
    	    jsonConfig.registerJsonValueProcessor(Date.class, new JsonDateValueProcessor());  
    	        
    	    JSONObject json = JSONObject.fromObject(bean,jsonConfig);  
    	    return json.toString(); 
    }
    

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