格式化输出json字符串

喜欢ヅ旅行 2023-09-28 08:15 175阅读 0赞

## 1、使用阿里的[FastJson][] ##

### 1.1、pom依赖 ###

<dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.58</version>
    </dependency>

### 1.2、示例代码 ###

import com.alibaba.fastjson.JSON;
    import com.alibaba.fastjson.serializer.SerializerFeature;
    import com.example.demo.exception.ApiResult;
    import com.example.springcloudstudyquartz.beans.QuartzEntity;
    import com.example.springcloudstudyquartz.service.IJobAndTriggerService;
    import com.example.springcloudstudyquartz.service.QuartzService;
    import com.example.springcloudstudyquartz.util.QuartzUtil;
    import lombok.extern.slf4j.Slf4j;
    import org.quartz.Job;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @Slf4j
    @RestController
    @RequestMapping(value = "/job")
    public class JobCronController {
        @Autowired
        private IJobAndTriggerService iJobAndTriggerService;
    
        @Autowired
        private QuartzService quartzService;
    
        @RequestMapping("/addJob")
        public ApiResult addJob(@RequestBody QuartzEntity quartzEntity) {
    
            // bean转json字符串
            String jsonStr = JSON.toJSONString(quartzEntity);
            log.info("入参bean转json字符串（未格式化）：{}", jsonStr);
    
            // 将bean 转化为格式化后的json字符串
            String pretty1 = JSON.toJSONString(quartzEntity, SerializerFeature.PrettyFormat, SerializerFeature.WriteMapNullValue,
                    SerializerFeature.WriteDateUseDateFormat);
            log.info("入参bean转json字符串（格式化后）：{}", pretty1);
    
    
            // 将未格式化的json字符串 转为格式化后的json字符串
            JSONObject jsonObject = JSONObject.parseObject(jsonStr);
            String pretty2 = JSON.toJSONString(jsonObject, SerializerFeature.PrettyFormat, SerializerFeature.WriteMapNullValue,
                    SerializerFeature.WriteDateUseDateFormat);
            log.info("入参json字符串（格式化后）：{}", pretty2);
    
            String jobClassName = quartzEntity.getJobClassName();
            String jobName = quartzEntity.getJobName();
            String jobGroup = quartzEntity.getJobGroup();
            String cronExpression = quartzEntity.getCronExpression();
            Job aClass = QuartzUtil.getClass(jobClassName);
    
            // 添加定时任务
            quartzService.addJob(aClass.getClass(),jobName,jobGroup,cronExpression);
    
            // 返回结果
            return ApiResult.success(quartzEntity);
        }
    }

### 1.3、格式化输出后的结果: ###

说明: FastJson通过Tab键进行换行后的格式化.

![363bc221812846a79c1ccdf6a270fbfc.png][]

## 2、使用谷歌的Gson ##

### 2.1、pom依赖 ###

<dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
        <version>2.2.4</version>
    </dependency>

### 2.2、示例代码 ###

public static void main(String[] args) {
        
        String jsonString = "{\"_index\":\"book_shop\",\"_type\":\"it_book\",\"_id\":\"1\",\"_score\":1.0," +
                "\"_source\":{\"name\": \"Java编程思想（第4版）\",\"author\": \"[美] Bruce Eckel\",\"category\": \"编程语言\"," +
                "\"price\": 109.0,\"publisher\": \"机械工业出版社\",\"date\": \"2007-06-01\",\"tags\": [ \"Java\", \"编程语言\" ]}}";
    	
    	String pretty = toPrettyFormat(jsonString)
    	
    	System.out.println(pretty);
    }
     
    /**
     * 格式化输出JSON字符串
     * @return 格式化后的JSON字符串
     */
    private static String toPrettyFormat(String json) {
    	JsonParser jsonParser = new JsonParser();
    	JsonObject jsonObject = jsonParser.parse(json).getAsJsonObject();
    	Gson gson = new GsonBuilder().setPrettyPrinting().create();
    	return gson.toJson(jsonObject);
    }

### 2.3、格式化输出后的结果: ###

{
      "_index": "book_shop",
      "_type": "it_book",
      "_id": "1",
      "_score": 1.0,
      "_source": {
        "name": "Java编程思想（第4版）",
        "author": "[美] Bruce Eckel",
        "category": "编程语言",
        "price": 109.0,
        "publisher": "机械工业出版社",
        "date": "2007-06-01",
        "tags": [
          "Java",
          "编程语言"
        ]
      }
    }

[FastJson]: https://so.csdn.net/so/search?q=FastJson&spm=1001.2101.3001.7020
[363bc221812846a79c1ccdf6a270fbfc.png]: https://img-blog.csdnimg.cn/363bc221812846a79c1ccdf6a270fbfc.png