记录一下,平时用到,可速查!
关键:
// startArray(); 开始解析数组
// endArray(); 结束解析数组
// startObject(); 开始解析键值对
// endObject(); 结束解析键值对
需要用到的jar包:http://repo1.maven.org/maven2/com/alibaba/fastjson/1.2.6/fastjson-1.2.6.jar
demoJson:{
"array": [
1,
2,
3
],
"arraylist": [
{
"a": "b",
"c": "d",
"e": "f"
},
{
"a": "b",
"c": "d",
"e": "f"
},
{
"a": "b",
"c": "d",
"e": "f"
}
],
"object": {
"a": "b",
"c": "d",
"e": "f"
},
"string": "Hello World"
}
/**
* Copyright (C), 2015-2019, XXX有限公司
* FileName: FastJsonTest
* Author: zhang.tong2
* Date: 2019/2/26 9:03
* Description:
* History:
* <author> <time> <version> <desc>
* 作者姓名 修改时间 版本号 描述
*/
package com.tong.appoint.web;
import com.alibaba.fastjson.JSONReader;
import java.io.StringReader;
/**
* 〈一句话功能简述〉<br>
* 〈〉
*
* @author zhang.tong2
* @create 2019/2/26
* @since 1.0.0
*/
public class FastJsonTest {
/**
* FastJson逐行解析json
* @author drlyee
* @date 2015-02-10
*/
public static void main(String[] args){
ReadWithFastJson();
}
public static void ReadWithFastJson()
{
String jsonString = "{\"array\":[1,2,3],\"arraylist\":[{\"a\":\"b\",\"c\":\"d\",\"e\":\"f\"},{\"a\":\"b\",\"c\":\"d\",\"e\":\"f\"},{\"a\":\"b\",\"c\":\"d\",\"e\":\"f\"}],\"object\":{\"a\":\"b\",\"c\":\"d\",\"e\":\"f\"},\"string\":\"HelloWorld\"}";
// 如果json数据以形式保存在文件中,用FileReader进行流读取!!
// path为json数据文件路径!!
// JSONReader reader = new JSONReader(new FileReader(path));
// 为了直观,方便运行,就用StringReader做示例!
// startArray(); 开始解析数组
// endArray(); 结束解析数组
// startObject(); 开始解析键值对
// endObject(); 结束解析键值对
JSONReader reader = new JSONReader(new StringReader(jsonString));
reader.startObject();
System.out.print("start fastjson");
while (reader.hasNext())
{
String key = reader.readString();
System.out.print("key " + key);
if (key.equals("array"))
{
reader.startArray();
System.out.print("start " + key);
while (reader.hasNext())
{
String item = reader.readString();
System.out.print(item);
}
reader.endArray();
System.out.print("end " + key);
}
else if (key.equals("arraylist"))
{
reader.startArray();
System.out.print("start " + key);
while (reader.hasNext())
{
reader.startObject();
System.out.print("start arraylist item");
while (reader.hasNext())
{
String arrayListItemKey = reader.readString();
String arrayListItemValue = reader.readObject().toString();
System.out.print("key " + arrayListItemKey);
System.out.print("value " + arrayListItemValue);
}
reader.endObject();
System.out.print("end arraylist item");
}
reader.endArray();
System.out.print("end " + key);
}
else if (key.equals("object"))
{
reader.startObject();
System.out.print("start object item");
while (reader.hasNext())
{
String objectKey = reader.readString();
String objectValue = reader.readObject().toString();
System.out.print("key " + objectKey);
System.out.print("value " + objectValue);
}
reader.endObject();
System.out.print("end object item");
}
else if (key.equals("string"))
{
System.out.print("start string");
String value = reader.readObject().toString();
System.out.print("value " + value);
System.out.print("end string");
}
}
reader.endObject();
System.out.print("start fastjson");
}
}