Java Json转换之JsonBinder

JsonBinder是springside对jackson-xxx.jar中java到json转换的封装，教JSONArray的转换方式效率高。推荐使用。
JsonBinder源码：
package mg.utils;

import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;

import org.apache.commons.lang3.StringUtils;
import org.apache.log4j.Logger;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.annotate.JsonSerialize.Inclusion;

/**
 * 依赖jackson-mapper-lgpl (82) 
		jackson-core-lgpl (82) 包
 * @author meigang 2015-03-31
 *
 */
public class JsonBinder {  
	  
    private static Logger log = Logger.getLogger(JsonBinder.class);  
  
    private ObjectMapper mapper;  
  
    public JsonBinder(Inclusion inclusion) {  
        mapper = new ObjectMapper();  
        //设置输出包含的属性  
        mapper.getSerializationConfig().setSerializationInclusion(inclusion);  
        //设置输入时忽略JSON字符串中存在而Java对象实际没有的属性  
        mapper.getDeserializationConfig().set(  
                org.codehaus.jackson.map.DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);  
    }  
  
    /** 
     * 创建输出全部属性到Json字符串的Binder. 
     */  
    public static JsonBinder buildNormalBinder() {  
        return new JsonBinder(Inclusion.ALWAYS);  
    }  
  
    /** 
     * 创建只输出非空属性到Json字符串的Binder. 
     */  
    public static JsonBinder buildNonNullBinder() {  
        return new JsonBinder(Inclusion.NON_NULL);  
    }  
  
    /** 
     * 创建只输出初始值被改变的属性到Json字符串的Binder. 
     */  
    public static JsonBinder buildNonDefaultBinder() {  
        return new JsonBinder(Inclusion.NON_DEFAULT);  
    }  
  
    /** 
     * 如果JSON字符串为Null或"null"字符串,返回Null. 
     * 如果JSON字符串为"[]",返回空集合. 
     *  
     * 如需读取集合如List/Map,且不是List<String>这种简单类型时使用如下语句: 
     * List<MyBean> beanList = binder.getMapper().readValue(listString, new TypeReference<List<MyBean>>() {}); 
     */  
    public <T> T fromJson(String jsonString, Class<T> clazz) {  
        if (StringUtils.isEmpty(jsonString)) {  
            return null;  
        }  
  
        try {  
            return mapper.readValue(jsonString, clazz);  
        } catch (IOException e) {  
            log.warn("parse json string error:" + jsonString, e);  
            return null;  
        }  
    }  
  
    /** 
     * 如果对象为Null,返回"null". 
     * 如果集合为空集合,返回"[]". 
     */  
    public String toJson(Object object) {  
  
        try {  
            return mapper.writeValueAsString(object);  
        } catch (IOException e) {  
            log.warn("write to json string error:" + object, e);  
            return null;  
        }  
    }  
  
    /** 
     * 设置转换日期类型的format pattern,如果不设置默认打印Timestamp毫秒数. 
     */  
    public void setDateFormat(String pattern) {  
        if (StringUtils.isNotBlank(pattern)) {  
            DateFormat df = new SimpleDateFormat(pattern);  
            mapper.getSerializationConfig().setDateFormat(df);  
            mapper.getDeserializationConfig().setDateFormat(df);  
        }  
    }  
  
    /** 
     * 取出Mapper做进一步的设置或使用其他序列化API. 
     */  
    public ObjectMapper getMapper() {  
        return mapper;  
    }  
} 
TestJsonBinder测试
package mg.utils;

import java.util.Date;

import org.apache.log4j.Logger;
import org.junit.Test;

public class TestJsonBinder {
	Logger log = Logger.getLogger(TestJsonBinder.class);
	@Test
	public void test1(){
		Person p = new Person("小刚", "男", 22, new Date());
		String pJson = JsonBinder.buildNormalBinder().toJson(p);
		log.info(pJson);
	}
}

class Person{
	private String name;
	private String sex;
	private int age;
	private Date borthday;
	
	public Person(String name, String sex, int age, Date borthday) {
		this.name = name;
		this.sex = sex;
		this.age = age;
		this.borthday = borthday;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public Date getBorthday() {
		return borthday;
	}
	public void setBorthday(Date borthday) {
		this.borthday = borthday;
	}
	
}
输出结果：
[2015-03-31 19:47:16 INFO ] [main] {mg.utils.TestJsonBinder:14}-{"name":"小刚","sex":"男","age":22,"borthday":1427802435833}