Java基础之FastJson详解

一、fastjson将json格式字符串转化成list集合

注：json格式字符串必须符合数组型格式如[{"a":a},{"b":b}]

场景一：前端向后台传递数组格式的json字符串，如何转化成list集合

list<accountbean> readjson2list =json.parsearray(json, accountbean.class)注意这里是bean.class而不是list.class

	@test
	public void readjson2listbean() {
		string json = "[{\"address\": \"address2\",\"name\":\"haha2\",\"id\":2,\"email\":\"email2\"},{\"address\":\"address\",\"name\":\"haha\",\"id\":1,\"email\":\"email\"}]";
		list<accountbean> readjson2list =json.parsearray(json, accountbean.class);
		//输出测试
		jsonutils.beantojson(readjson2list);
	}

场景二：前端向后台传递数组格式的json字符串，如何转化成list<hashmap<string,object>>集合

	@test
	public void readjson2listmap() {
		string json = "[{\"address\": \"address2\",\"name\":\"haha2\",\"id\":2,\"email\":\"email2\"},{\"address\":\"address\",\"name\":\"haha\",\"id\":1,\"email\":\"email\"}]";
		list<hashmap> readjson2list =json.parsearray(json,hashmap.class);
		//输出测试
		jsonutils.beantojson(readjson2list);
	}

二、fastjson将json格式字符串转化成对象

场景一：前端向后台传递数组格式的json字符转化成bean对象

@test
	public void readjson2bean() {
		string json = "{\"address\": \"address2\",\"name\":\"haha2\",\"id\":2,\"email\":\"email2\"}";
		accountbean accountbean  =json.parseobject(json,accountbean.class);
		//输出测试
		jsonutils.beantojson(accountbean);
	}

场景二：前端向后台传递数组格式的json字符串map<string,object>集合

@test
	public void readjson2map() {
		string json = "{\"address\": \"address2\",\"name\":\"haha2\",\"id\":2,\"email\":\"email2\"}";
		hashmap<string,object> accountbean  =json.parseobject(json,map.class);
		//输出测试
		jsonutils.beantojson(accountbean);
	}

测试：

三、fastjson将对象或集合转化成json格式字符串

@test
	public void beanandcollectiontojson() {
		accountbean	bean = new accountbean();
		bean.setaddress("china-guangzhou");
		bean.setemail("[e-mail]");
		bean.setid(1);
		bean.setname("hoojo");
		string json  = json.tojsonstring(bean);
		system.out.println(json);
	}

四、fastjson将json格式字符串转化成json对象

@test
	public void jsonstringtojsonbean() {
		string json = "{\"address\": \"address2\",\"name\":\"haha2\",\"id\":2,\"email\":\"email2\"}";
		jsonobject parse = (jsonobject) json.parse(json);
		string address = (string) parse.get("address");
		system.out.println("输出address=="+address);
	}

五、fastjson将json格式字符串转化成json数组

	@test
	public void jsonstring2jsonarray() {
		string json = "[{\"address\": \"address2\",\"name\":\"haha2\",\"id\":2,\"email\":\"email2\"},{\"address\":\"address\",\"name\":\"haha\",\"id\":1,\"email\":\"email\"}]";
		jsonarray parsearray = json.parsearray(json);
		//输出测试
		jsonutils.beantojson(parsearray.get(0));
	}

六、fastjson将java对象转化成json对象

@test
	public void beanandcollectiontojsonbean() {
		accountbean	bean = new accountbean();
		bean.setaddress("china-guangzhou");
		bean.setemail("[e-mail]");
		bean.setid(1);
		bean.setname("hoojo");
		jsonobject json  = (jsonobject) json.tojson(bean);
		json.get("address");
		system.out.println(json);
	}

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