json与对象互转,json数组与对象数组互转 引用了 jackson-core-lgpl-1.9.2.jar jackson-mapper-lgpl-1.9.2.jar 特别说明的是:spring mvc里也是使用这两个包,通过注解@ResponseBody将返回的对象或map或list转成json输出到前端
Person person = new Person("张三", 23, "无", 105.00);
ObjectMapper objectMapper = new ObjectMapper();
try {
String jsonStr = objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(person);
System.out.println("start, " + new Date());
objectMapper.writerWithDefaultPrettyPrinter().writeValue(new File("person.json"), person);
System.out.println("end, " + new Date());
System.out.println();
System.out.print(jsonStr);
} catch (IOException e) {
e.printStackTrace();
}