# JsonParser

**Repository Path**: da9527/json-parser

## Basic Information

- **Project Name**: JsonParser
- **Description**: 用java简单的解析json字符串
- **Primary Language**: Unknown
- **License**: MIT
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2025-03-05
- **Last Updated**: 2025-03-06

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# 用java简单的解析json字符串

用正则的效率会比用有限状态机的方式解析的时间长一些
```java
//准备json字符串
String json = "{\"model\":\"qwen2:0.5b\",\"created_at\":\"2024-07-11T01:32:50.903641Z\",\"response\":\"我是一台计算机程序，我的真实身份和存在方式都与人类的思维习惯和行为习惯有所不同。我是由阿里云开发的一个超大规模语言模型，是基于阿里云研发的大规模语言模型之一。我是“通义千问”的作者。\",\"done\":true,\"done_reason\":\"stop\",\"context\":[151644,872,198,105043,100165,30,151645,198,151644,77091,198,35946,99639,53938,104564,74220,3837,97611,100267,101294,33108,47606,75768,71268,57218,103971,9370,102141,100784,33108,101070,100784,115742,1773,104198,67071,102661,99718,100013,104111,71304,105483,102064,104949,3837,20412,104210,102661,99718,100048,104197,100176,102064,104949,100653,1773,104198,2073,31935,64559,99320,56007,97907,57421,1773,151645,198],\"total_duration\":4328001200,\"load_duration\":3060245600,\"prompt_eval_count\":12,\"prompt_eval_duration\":37756000,\"eval_count\":55,\"eval_duration\":1227625000}";

//使用状态机方式解析
long startTime = System.nanoTime();
com.da.core.state.JsonParser stateParser = new com.da.core.state.JsonParser();
JsonObject stateParse = (JsonObject) stateParser.parse(json);
long endTime = System.nanoTime();
System.out.println("state parse time: " + (endTime - startTime) + " ns");
System.out.println("state parse: " + stateParse);

//使用正则解析
startTime = System.nanoTime();
com.da.core.stack.JsonParser stackParser = new com.da.core.stack.JsonParser();
JsonObject stackParse = (JsonObject) stackParser.parse(json);
endTime = System.nanoTime();
System.out.println("stack parse time: " + (endTime - startTime) + " ns");
System.out.println("stack parse: " + stackParse);
```

转换json为实体类
```java
User user = JsonMapperUtil.fromJson("{\"name\":\"阿达\",\"age\":18}", User.class);
System.out.println("user: " + user);
```