使用jackson工具类把对象或集合转为JSON格式

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jackson使用方法：

1、加入jar包：

jackson-annotations-2.2.2.jar

jackson-core-2.2.2.jar

jackson-databind-2.2.2.jar

2、具体的使用步骤：

1）、创建org.codehaus.jackson,map.ObjectMapper 对象

2）、调用ObjectMapper 的 writeValueAsString 方法把Java 对象或集合转为JSON字符串

ObjectMapper mapper = new ObjectMapper();

String jsonStr = mapper.writerValueAsString(String str);

3、注意：

1）、Jackson 根据getter 来定位Json 对象的属性，而不是字段！

2）、可以在类的 getter 方法上添加注解：org.codehaus.jackson.annotate.JsonIgnore . 转为Json对象时已忽略该属性！

测试代码如下：

package com.lym.ajax.beans;import java.util.Arrays;import java.util.List;import com.fasterxml.jackson.annotation.JsonIgnore;import com.fasterxml.jackson.core.JsonProcessingException;import com.fasterxml.jackson.databind.ObjectMapper;/** * jackson测试类 * @author liuyanmin * 2015-1-20 上午11:23:55 */public class ShopCart {private String bookName;private int price=0;private int number=0;public ShopCart(String bookName, int price, int number) {super();this.bookName = bookName;this.price = price;this.number = number;}public String getBookName() {return bookName;}public void setBookName(String bookName) {this.bookName = bookName;}@JsonIgnorepublic int getPrice() {return price;}public void setPrice(int price) {this.price = price;}public int getNumber() {return number;}public void setNumber(int number) {this.number = number;}public static void main(String args[]){ObjectMapper mapper = new ObjectMapper();ShopCart sc = new ShopCart("JavaEE",100,1);List<ShopCart> list = Arrays.asList(sc,new ShopCart("Oracle",200,2));try {String result = mapper.writeValueAsString(sc);String resList = mapper.writeValueAsString(list);System.out.println(result);System.out.println(resList);} catch (JsonProcessingException e) {e.printStackTrace();}}}

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