json-lib的一些运用

package com.yt.manager.json;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.springframework.stereotype.Component;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

/**
 * @Description:将对象转化为json格式
 * @ClassName: JsonTest
 * @Project: base-info
 * @Author: zxf
 * @Date: 2011-6-14
 */
@Component
public class JsonTest {

	/**
	 * 把单个实体Bean转化为JSON格式
	 * @return JSONObject
	 */
	public JSONObject objectToJson() {
		Student student = new Student();
		student.setAge(18);
		student.setName("zhangsan");
		student.setSex("male");
		return JSONObject.fromObject(student);
	}

	/**
	 * 把实体Bean数组转化成JSONArray对象
	 * @return JSON格式的字符串
	 */
	public String arrayToJson() {
		Student stu = null;
		List<Student> stuList = new ArrayList<Student>();
		for (int i = 0; i < 5; i++) {
			stu = new Student();
			stu.setId(i + 1 + "");
			stu.setAge(i * 10 + 8);
			stu.setName("张三" + i);
			stu.setSex("和");
			stuList.add(stu);
		}
		JSONArray jsonArray = JSONArray.fromObject(stuList);
		return jsonArray.toString();
	}
	
	/**
	 * 把实体Bean数组转化成JSONArray对象
	 * @return JSONArray
	 */
	public JSONArray arrayToJson2() {
		Student stu = null;
		List<Student> stuList = new ArrayList<Student>();
		for (int i = 0; i < 5; i++) {
			stu = new Student();
			stu.setId(i + 1 + "");
			stu.setAge(i * 10 + 8);
			stu.setName("张三" + i);
			stu.setSex("和");
			stuList.add(stu);
		}
		return JSONArray.fromObject(stuList);
	}

	/**
	 * 多维JSON格式数组
	 * 
	 * @return JSON格式的字符串
	 */
	public String array2ToJson() {
		Student stu = null;
		List<Student> stuList = new ArrayList<Student>();
		for (int i = 0; i < 5; i++) {
			stu = new Student();
			stu.setId(i + 1 + "");
			stu.setAge(i * 10 + 8);
			stu.setName("张三" + i);
			stu.setSex("和");
			stuList.add(stu);
		}
		Map<String, Object> map = new HashMap<String, Object>();
		map.put("list", stuList);
		map.put("count", "10");
		return JSONObject.fromObject(map).toString();
	}

	/**
	 * 多维JSON格式数组
	 * 
	 * @return JSONObject
	 */
	public JSONObject array2ToJson2() {
		Student stu = null;
		List<Student> stuList = new ArrayList<Student>();
		for (int i = 0; i < 5; i++) {
			stu = new Student();
			stu.setId(i + 1 + "");
			stu.setAge(i * 10 + 8);
			stu.setName("张三" + i);
			stu.setSex("和");
			stuList.add(stu);
		}
		Map<String, Object> map = new HashMap<String, Object>();
		map.put("list", stuList);
		map.put("count", "10");
		return JSONObject.fromObject(map);
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		JsonTest t = new JsonTest();
		t.arrayToJson();
	}
}

package com.yt.manager.json.controller;

import javax.annotation.Resource;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import com.yt.manager.json.JsonTest;

/**
 * @Description:获取json格式的内容request到页面
 * @ClassName: JsonController
 * @Project: base-info
 * @Author: zxf
 * @Date: 2011-6-15
 */
@Controller
@RequestMapping("/json")
public class JsonController {

	Logger log = Logger.getLogger(JsonController.class);

	@Resource
	JsonTest jsonTest;
	
	/**
	 * 调用了一个返回Json数组格式的字符串，需要将字符串转化为JSONArray格式的数组，才能put到页面
	 * @param map
	 * @return
	 */
	@RequestMapping(value = "arrayToJson")
	public String arrayToJson(ModelMap map) {
		String jsonStr = jsonTest.arrayToJson();
		log.info("数据：" + jsonStr);
		map.put("json", JSONArray.fromObject(jsonStr));
		return "json/arrayToJson";
	}
	
	/**
	 * 调用了一个返回JSONArray对象的数组,不需要任何转化即可put到页面
	 * @param map
	 * @return
	 */
	@RequestMapping(value = "arrayToJson2")
	public String arrayToJson2(ModelMap map) {
		map.put("json", jsonTest.arrayToJson2());
		return "json/arrayToJson";
	}

	/**
	 * 调用返回JSON格式的字符串的方法，如要返回到页面， 需要将字符串重新转化为JSONObject对象
	 * 
	 * @param map
	 * @return
	 */
	@RequestMapping(value = "array2ToJson")
	public String array2ToJson(ModelMap map) {
		String jsonStr = jsonTest.array2ToJson();
		log.info("数据：" + jsonStr);
		map.put("json", JSONObject.fromObject(jsonStr));
		return "json/array2ToJson";
	}

	/**
	 * 调用直接返回JSONObject的方法，直接put到页面即可
	 * 
	 * @param map
	 * @return
	 */
	@RequestMapping(value = "array2ToJson2")
	public String array2ToJson2(ModelMap map) {
		map.put("json", jsonTest.array2ToJson2());
		return "json/array2ToJson";
	}

	/**
	 * 返回单个JSONObject对象，本方法直接调用了一个返回单个JSONObject对象的方法，
	 * 该JSONObject对象中只放了一个实体bean方法
	 * 
	 * @param map
	 * @return
	 */
	@RequestMapping(value = "objectToJson")
	public String objectToJson(ModelMap map) {
		JSONObject jsonObject = jsonTest.objectToJson();
		log.info("对象：" + jsonObject);
		map.put("json", jsonObject);
		return "json/objectToJson";
	}

}

package com.yt.manager.json;

/**
 * @Description:
 * @ClassName: Student
 * @Project: base-info
 * @Author: zxf
 * @Date: 2011-6-14
 */
public class Student {

	public String id;
	public int age;
	public String name;
	public String sex;

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	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;
	}

}