Jackson的使用

1、Jackson可以将Java对象转换成json对象和xml文档,同样也可以将json、xml转换成Java对象。性能要比json-lib相对高些。

2、涉及到的jar包:

--jackson-annotations-2.2.2.jar

--jackson-core-2.2.2.jar

--jackson-databind-2.2.2.jar

3、测试:将JavaBean转为Json字符串

--Customer类:

package com.tt.test;

public class Customer {
    private String name;
    private int age;
    
    
    public Customer(String name, int age) {
        super();
        this.name = name;
        this.age = age;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getCity(){
        return "BJ";
    }
    public String getBirth(){
        return "1990-12-11";
    }
}

--使用ObjectMapper对象的writeValueAsString()方法将Customer对象转为Json字符串:

public void testJackson() throws JsonProcessingException {
    Customer customer = new Customer("tt", 22);
    ObjectMapper mapper = new ObjectMapper();
    
    String jsonStr = mapper.writeValueAsString(customer);
    System.out.println(jsonStr);
}

--输出结果为:

{"name":"tt","age":22,"city":"BJ","birth":"1990-12-11"}

--注意:Jackson根据getter来定位Json对象的属性,而不是自定义的字段;

--可以在getter方法上添加 @JsonIgnore 注解来忽略相应的属性;

posted on 2015-12-19 20:00  _taoGe  阅读(522)  评论(0编辑  收藏  举报