jsonlib List 和 json 对象互相转换简单例子。 .

使用jsonlib,不仅需要jsonlib的jar包,还需要:

•jakarta commons-lang 2.5
•jakarta commons-beanutils 1.8.0
•jakarta commons-collections 3.2.1
•jakarta commons-logging 1.1.1
•ezmorph 1.0.6
如果要使用json转换List等集合对象,一定要使用JSONArray,不可以使用JSONObject。

public class JsonLibTest {
	
	public List<TreeNode> getEntity(){
		List<TreeNode> result = new ArrayList<TreeNode>();
		TreeNode tn = new TreeNode();
		tn.setId(1);
		tn.setPid(0);
		tn.setName("目录1");
		result.add(tn);
		tn = new TreeNode();
		tn.setId(11);
		tn.setPid(1);
		tn.setName("目录11");
		result.add(tn);
		tn = new TreeNode();
		tn.setId(111);
		tn.setPid(11);
		tn.setName("目录111");
		result.add(tn);
		tn = new TreeNode();
		tn.setId(12);
		tn.setPid(1);
		tn.setName("目录12");
		result.add(tn);
		tn = new TreeNode();
		tn.setId(2);
		tn.setPid(0);
		tn.setName("目录2");
		result.add(tn);
		tn = new TreeNode();
		tn.setId(1);
		tn.setPid(0);
		tn.setName("目录1");
		result.add(tn);
		return result;
	}
	
	public String testEntityList2Json(){
		String result = "";
		List<TreeNode> entity = this.getEntity();
		JSONArray jsonArray = JSONArray.fromObject(entity);
		result = jsonArray.toString();
		System.out.println("************************ Json:\n"+result);
		return result;
	}
	
	public void testJson2EntityList(){
		List<TreeNode> result = null;		
		String json = this.testEntityList2Json();
		JSONArray jsonobj = JSONArray.fromObject(json);
		result = (List<TreeNode>) JSONArray.toList(jsonobj,TreeNode.class); 
		for(TreeNode tn:result){
			System.out.println(tn.getName());
		}
	}
	
	public static void main(String args[]){
		JsonLibTest test = new JsonLibTest();
		test.testJson2EntityList();
	}

}

public class TreeNode {
	private Integer id;
	private Integer pid;
	private String name;
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public Integer getPid() {
		return pid;
	}
	public void setPid(Integer pid) {
		this.pid = pid;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
}

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